Airframe Questions 2019
8631. Aircraft instrument panels are generally shock-mounted to absorb
B-low frequency, high-amplitude shocks.
8416. Petroleum base hydraulic fluid is which color?
C-Red.
8366. Excessive wear in the shoulder area of an aircraft tire is an indication of
C-underinflation.
8158. (Refer to figure 4.) The amount of material required to make the 90° bend is
A-0.3436 inch.
8088. Which of the following are generally characteristic of aramid fiber (Kevlar) composites? 1. High tensile strength. 2. Flexibility. 3. Stiffness. 4. Corrosive effect in contact with aluminum. 5. Ability to conduct electricity.
A-1 and 2.
8602. A Bourdon tube instrument may be used to indicate 1. pressure. 2. temperature. 3. position.
A-1 and 2.
8643. Which instruments are connected to an aircraft's static pressure system only? 1. Vertical speed indicator. 2. Cabin altimeter. 3. Altimeter. 4. Cabin rate-of-change indicator, 5. Airspeed indicator.
A-1 and 3.
8749. What are the four general types of fuel quantity gauges? 1. Sight glass. 2. Mechanical. 3. Electrical. 4. Electronic. 5. Bourdon tube. 6. Vane-type transmitter. 7. Litmus indicator. 8. Direct-reading static pressure type.
A-1, 2, 3, 4.
8838. Which of the following are the major parts of a DC motor? 1. Armature assembly. 2. Field assembly. 3. Brush assembly. 4. Commutator. 5. Pole piece. 6. Rheostat. 7. End frame.
A-1, 2, 3, 7.
8797. Microbial growth is produced by various forms of micro-organisms that live and multiply in the water interfaces of jet fuels. Which of the following could result if microbial growth exists in a jet fuel tank and is not corrected? 1. Interference with fuel flow. 2. Interference with fuel quantity indicators. 3. Engine seizure. 4. Electrolytic corrosive action in a metal tank. 5. Lower grade rating of the fuel. 6. Electrolytic corrosive action in a rubber tank.
A-1, 2, 4.
8842. When selecting hardware for attaching bonding connections to an aircraft structure, which of the following should be considered? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Permissible voltage drop. 5. Amount of current to be carried. 6. Type of load (continuous or intermittent).
A-1, 3, 5.
8967. Which of the following are some uses for a DC-selsyn system? 1. Indicates position or retractable landing gear. 2. Indicates the angle of incidence of an aircraft. 3. Indicates the altitude of an aircraft. 4. Indicates cowl flaps or oil cooler door position. 5. Indicates fuel quantity. 6. Indicates the rate of climb of an aircraft. 7. Indicates position of wing flaps.
A-1, 4, 5, 7. 1. Indicates position or retractable landing gear. 4. Indicates cowl flaps or oil cooler door position. 5. Indicates fuel quantity. 7. Indicates position of wing flaps.
8111.(Refer to figure 1.) Which of the rivets shown will accurately fit the conical depression made by a 100° countersink?
A-1.
8693. (Refer to Figure 16.) Which of the antennas shown is a typical DME antenna?
A-1.
8183. Why is it necessary to use flux in all silver soldering operations?
A-To chemically clean the base metal of oxide film.
8845. When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is
A-1.
8409. (Refer to Figure 11.) Which fitting is an AN flared tube fitting?
A-1. (2. is AC fitting.)
8164. The flat layout or blank length of piece of metal from which a simple L-shaped bracket 3 inches by 1 inch is to be bent depends upon the radius of the desired bend. The bracket which will require the greatest amount of material is one which has a bend radius of
A-1/8. (The large the bend radius in this L-shaped bracket, the less material is needed.)
8299. The maximum time a 100-hour inspection may be extended is
A-10 hours.
8691. When bending coaxial cable, the bend radius should be at least
A-10 times the diameter of the cable.
8447. Using a hand pump, pressure of 100 PSI has been built up in a hydraulic system. The hand pump piton is 1 inch in diameter. A 1/2-inch line connects the hand pump to an actuating cylinder 2 inches in diameter. What is the pressure in the line between the hand pump and the actuator?
A-100 PSI.
8104. What should be the included angle of a twist drill for soft metals?
A-118° (59° each side.)
8122. What should be the included angle of a twist drill for hard metal?
A-118°.
8303. Where would you find the operating conditions that make a 100-hour inspection mandatory?
A-14 CFR Part 91.
8162. A piece of flat stock that is to be bent to a closed angle of 15° must be bent though an angle of
A-165°.
8585. Which of the following are characteristic of a chemical or solid state oxygen system? 1. An adjustable oxygen release rate. 2. A volume storage capacity about three times that of compressed oxygen. 3. The system generators are inert below 400°F even under severe impact. 4. A distribution and regulating system similar to gaseous oxygen systems.
A-2 & 3.
8086. Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels? 1. Microballoons. 2. Flox. 3. Chopped fibers.
A-2 and 3.
8636. Where may a person look for the information necessary to determine the required markings on an engine instrument? 1. Engine manufacturer's specifications. 2. Aircraft flight manual. 3. Instrument manufacturer's specifications. 4. Aircraft maintenance manual.
A-2 or 4.
8993. What are three methods of anti-icing aircraft windshields? 1. Blanket-type heating system. 2. An electric heating element in the windshield. 3. Heated are circulating system. 4. Hot water system. 5. Windshield wipers and anti-icing fluid. 6. Ribbon-type heating system.
A-2, 3, 5. 2. An electric heating element in the windshield. 3. Heated are circulating system. 5. Windshield wipers and anti-icing fluid.
8599. Which of the following instrument discrepancies will require replacement of the instrument? 1. Red line missing. 2. Case leaking. 3. Glass cracked. 4. Mounting screws loose. 5. Case pain chipped. 6. Leaking at line B nut. 7. Will not adjust. 8. Fogged.
A-2, 3, 7, 8.
8064. How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels? 1. Greater concentrations of resin in edges and corners. 2. Improved strength to weight ratio. 3. Less density. 4. Lower stress concentrations.
A-2, 3, and 4.
8841. Which of the following factors must be taken into consideration when determining the wire size to use for an aircraft installation? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Resistance of current return path through the aircraft structure. 5. Permissible voltage drop. 6. Current carrying capability of the conductor. 7. Type of load (continuous or intermittent).
A-2, 5, 6, 7.
8138. The primary alloying agent of 2024-T3 is indicated by the number
A-2.
8139. Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture?
A-2.
8688. (Refer to Figure 15.) What is the approximate drag load on an antenna with a frontal area of .125 square feet installed on an aircraft with a speed of 225 MPH?
A-2.069 pounds.
9021. (Refer to Figure 21.) Determine what pressure is acceptable for a fire extinguisher when the surrounding area temperature is 33°F. (Rounded to the nearest whole number.)
A-215 to 302 PSIG.
8514. To be eligible for recharging, a DOT 3HT oxygen cylinder must have been hydrostatically tested every three years and be retired from service after
A-24 years or 4,380 filling cycles.
8384. (Refer to Figure 10.) The trunnion nut on an aircraft landing gear requires a torque of 320 inch-pounds. To reach the nut, a 2-inch straight adapter must be used on an 18-inch torque wrench. How many foot-pounds will be indicated on the torque wrench when the required torque of the nut is reached?
A-24. Tw = (Ta x L) ÷ (L + A)
8601. Barometric altimeter indicates pressure altitude when the barometric scale is set at
A-29.92" Hg.
8689. (Refer to Figure 15.) What is the approximate drag load on an antenna with a frontal area of .137 square feet installed on an aircraft with a speed of 275 MPH?
A-3.387 pounds.
8159. (Refer to figure 5.) What is the length of flat A?
A-3.7 inches. Setback = 0.312
8157. (Refer to figure 4.) The length of flat A is
A-3.750 inches. Setback = 0.25 Bend allowance = 0.343612
8572. (Refer to Figure 14.) One hour after an oxygen system was charged for a leakage check, the oxygen pressure gauge read 460 PSI at 63°F; 6 hours later the temperature was 51°F. (A 5 PSI change is the maximum allowable in a 6-hour period.) What pressure gauge readings would be acceptable to remain within the allowable limits?
A-445 to 450 PSI.
8721. What is one purpose of a fuel tank vent?
A-To maintain atmospheric pressure.
8026. If registration numbers are to be applied to an aircraft with a letter height of 12 inches, what is the minimum space required for the registration mark N1683C? Note: 2/3 x height = character width. 1/6 x height = width for 1. 1/4 x 2/3 height = spacing. 1/6 x height = stroke or line width.
A-52 inches.
8101. How many MS20470 AD-4-6 rivets will be required to attach a 10" x 5" plate, using a single row or rivets, minimum edge distance, and 4D spacing?
A-56.
8800. What is the maximum vapor pressure allowable for an aircraft fuel?
A-7 PSI. (At 100°F)
8694-12. (Refer to Figure 33.) What kind of antenna is this?
A-A VOR/glide slope antenna.
8694-13. (Refer to Figure 34.) What kind of antenna is this?
A-A VOR/glide slope antenna.
8992. Which of the following is the best means to use when removing wet snow from an aircraft?
A-A brush or a squeegee.
8694-3. (Refer to Figure 24.) What kind of antenna is this?
A-A dipole antenna.
8694-9. (Refer to Figure 30.) What kind of antenna is this?
A-A lightning detector system antenna.
8464. When hydraulic system pressure control and relief units fail to function properly, how are most system protected against overpressure?
A-A shear section on the main hydraulic pump drive shaft.
8003. Where is the information found concerning acceptable species substitutions for wood materials used in aircraft repair?
A-AC 43.13-1B.
8508. How can it be determined that a vapor-cycle cooling system is charged with the proper amount of freon?
A-Air bubbles in the sight glass disappear.
8228. Other than the manufacturer maintenance manual what other document could be used to determine the primary flight control surface deflection for an imported aircraft that is reassembled after shipment?
A-Aircraft type certificate data sheet.
8988. Carburetor icing may be eliminated by which of the following methods?
A-Alcohol spray and heated induction air.
8987. Why are the tubes in deicer boots alternately inflated?
A-Alternate inflation of deicer boot tubes keeps disturbance of the airflow to a minimum.
8971. What is one check for proper operation of a pitot/static tube heater after replacement?
A-Ammeter reading.
8694-7. (Refer to Figure 28.) What kind of antenna is this?
A-An ELT antenna. (ELT = Emergency Locator Transponder)
8295. Which statement is correct regarding an aircraft that is found to be unairworthy after an annual inspection, due to an item requiring a major repair (assuming approved data is used to accomplish the repair)?
A-An appropriately rated mechanic may accomplish the repair, and an IA may approve the aircraft for return to service.
8310. Aside from an external leak in the line, what will cause parking brakes to continually bleed off pressure?
A-An internal leak in the master cylinder.
8112. Which is correct concerning the use of a file?（锉）
A-Apply pressure on the forward stroke, only, expect when filling very soft metals such as lead or aluminum.
8365. How long should you wait after a flight before checking tire pressure?
A-At least 2 hours (3 hours in hot weather)
8509. When charging a vapor-cycle cooling system after evacuation, the low-pressure gauge fails to come out of a vacuum. What is indicated?
A-Blockage in the system.
8628. What must be done to an instrument panel that is supports by shock mounts?
A-Bonding straps must be installed across the instrument mounts as a current path.
8273. Where does the breakage of control cable wires occur most frequently?
A-Breakage usually occurs where cables pass over pulleys and through fairleads.
9011. What is the color code for fire-extinguisher lines?
A-Brown.
8802. How may the antiknock characteristics of a fuel be improved?
A-By adding a knock inhibitor.
8060. How does acoustic emission testing detect defects in composite materials?
A-By picking up the "noise" of any deterioration that may be present.
8732. What should be used to inert an integral fuel tank before attempting repairs?
A-CO₂.
8504. What controls the operation of the cabin pressure regulator?
A-Cabin altitude.
8566. What controls the amount of oxygen delivered to a mask in a continuous-flow oxygen system?
A-Calibrated orifice.
8007. Which of the following conditions will determine acceptance of wood with mineral steaks?
A-Careful inspection fails to reveal any decay.
8388. Which allows free fluid flow in one direction and no fluid flow in the other direction?
A-Check valve.
8518. For use in pressurized aircraft, which is generally the least complicated and requires the least maintenance?
A-Chemical oxygen generator systems.
8750. How does temperature affect fuel weight?
A-Cold fuel is heavier per gallon.
8507. What component might possibly be damaged if liquid refrigerant is introduced into the low side of a vapor-cycle cooling system when the pressure is too high or the outside air temperature is too low?
A-Compressor.
8528. What is the purpose of a mixing valve in a compressor bleed air air-conditional system?
A-Control the supply of hot, cool, and cold air.
8262. When used in close proximity to magnetic compasses, cotter pins are made of what material?
A-Corrosion resisting steel.
8034. What is likely to occur if unhydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low?
A-Corrosion.
8609. Which of the following causes of aircraft magnetic compass inaccuracies may be compensated for by mechanics?
A-Deviation.
8596. Which statement regarding an aircraft instrument vacuum system is true?
A-Dry-type vacuum pumps with carbon vanes are very susceptible to damage from solid airborne particles and must take in only filtered air.
8070. The classification for fiberglass reinforcement material that has high resistivity and is the most common is
A-E-class.
8502. In the combustion heater, combustion air system, what prevents too much air from entering the heaters as air pressure increases?
A-Either a combustion air relief valve or a differential pressure regulator.
8740. Which aircraft fuel quantity indicating system incorporates a signal amplifier?
A-Electrinic.
8655. Which channel of an autopilot detects changes in pitch attitude of an aircraft?
A-Elevator.
8460. Which must be done before adjusting the relief valve of a main hydraulic system incorporating a pressure regulator?
A-Elimiate the action of the unloading valve.
8991. What mixture may be use as a deicing fluid to remove frost from an aircraft surface?
A-Ethylene glycol and isopropyl alcohol.
8513. How often should standard weight high-pressure oxygen cylinders be hydrostatically tested?
A-Every 5 years.
8498. At which component in an air-cycle cooling system does air undergo a pressure and temperature drop?
A-Expansion turbine.
8510. What component in a vapor-cycle cooling system would most likely be at fault if a system would not take a freon charge?
A-Expansion valve.
8414. Which is a characteristic of petroleum base hydraulic fluid?
A-Flammable under normal conditions.
8898. What is a method used for restoring generator field residual magnetism?
A-Flash the fields.
8677. On modern large aircraft, what electronic device typically monitors flight parameters and performs autopilot functions?
A-Flight management computer.
8238. What type of flap system increases the wing area and changes the wing camber?
A-Fowler flaps.
8762. Which of the following would give the first positive indication that a change-over from one fuel tank to another is needed?
A-Fuel pressure warning. (By a loss of pressure, that a fuel tank is empty. This drop in pressure warns the pilot to switch to a full tank.)
8423. Where can information be obtained about the compatibility of fire-resistant hydraulic fluid with aircraft materials?
A-Fuild manufacturer's technical bulletins.
8806. What is the principal advantage of the series-wound DC motor?
A-High starting torque.
8981. Where are the heat sensors located on most aircraft with electrically heated windshields?
A-Imbeded in the glass.
8900. Which of the following must be accomplished when installing an anti collision light?
A-Install a switch independent of the position light switch.
8292. Which should be accomplished before jacking an aircraft?
A-Install critical stress panets or plates.
8830. What is the most accurate type of frequency-measuring instrument?
A-Integrated circuit chip having a clock circuit.
8224. What is the purpose of the free-wheeling unit in a helicopter drive system?
A-It disconnects the rotor whenever the engine stops or slows below the equivalent of rotor RPM.
8738. which statement concerning an electronic capacitance-type fuel quantity indicating system is true?
A-It has no moving parts in the tank.
8754. What is the purpose of a float-operated transmitter installed in a fuel tank?
A-It sends an electric signal to the fuel quantity indicator.
8726. Why is the main fuel strainer located at the lowest point in the fuel system?
A-It traps any small amount of water that may be present in the fuel system.
8735. Why are jet fuels more susceptible to water contamination than aviation gasoline?
A-Jet fuel has a higher viscosity the gasoline.
8187. Which statement concerning soldering is correct?
A-Joint in electric wire to be soldered should be mechanically secure prior to soldering.
8497. Which section of a turbine engine provides high pressure bleed air to cycle machine for pressurization and air-conditioning?
A-Low or high pressure compressor.
8079. When making repairs to fiberglass, cleaning of the area to be repaired is essential for a good bond. The final cleaning should be made using
A-MEK (methyl ethyl ketone)
8833. What type of instrument is used for measuring very high values of resistance?
A-Megohmmeter.
8387. To prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal is the
A-O-ring seal.
8558. When a vapor-cycle cooling system is not in operation, what is an indication that the system is leaking freon?
A-Oil seepage.
8956. Where is the landing gear safety switch usually located?
A-On the main gear shock strut.
8710-3. What is the minimum distance allowed between a fuel tank and fire wall separating the engine?
A-One-half inch.
8193. The oxyacetylene flame used for aluminum welding should
A-be neutral and soft.
8345. What is the purpose of a compensating port or valve in a brake master cylinder of an independent brake system?
A-Permits the fluid toward or away from the reservoir as temperature changes.
8734. What method would be used to check for internal leakage of a fuel valve without removing the valve from the aircraft?
A-Place the valve in the OFF position, drain the stainer bowl, and with boost pumps on, watch to see if fuel flows to the strainer bowl.
8597. When an aircraft altimeter is set at 29.92" Hg on the ground, the altimeter will read
A-Pressure altitude.
8569. What is used in some oxygen systems to change high cylinder pressure to low system pressure?
A-Pressure reducer valve.
8574. In a gaseous oxygen system, which of the following are vented to blow out plugs in the fuselage skin?
A-Pressure relief valves.
8720. When inspecting a removable rigid fuel tank for leaks, what procedure should be followed?
A-Pressurize the tank with air and brush with soapy water.
8919. What is the ratio of turns between the primary coil winding and the secondary coil winding of a transformer designed to triple its input voltage?
A-Primary will have one-third as many turns as its secondary.
8061. What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure?
A-Prime the repair with a corrosion inhibitor and seal from the atmosphere.
8265. How are changes in direction of a control cable accomplished?
A-Pulleys.
8550. What unit in a vapor-cycle cooling system serves as a reservoir for the refrigerant?
A-Receiver-dryer.
8824. Which of the following is not one of the purpose of interlopes in a generator?
A-Reduce field strength. (Increase it)
8202. Why are aluminum plates 1/4 inch or more thick usually preheated before welding?
A-Reduces internal stresses and assures more complete penetration.
8653. What component of an autopilot system applies torque to the control surfaces of an aircraft?
A-Servo.
8153. What type loads cause the most rivet failures?
A-Shear.
8875. What kind of switch should you install in a single wire circuit that required the switch to be manually held in the ON position?
A-Single-pole, single-throw (SPST), two-position normally open (NO).
8203. How should a welding torch flame be adjusted to weld stainless steel?
A-Slightly carburizing.
8843. How should the splices be arranged if several are to be located in an electrical wire bundle?
A-Staggered along the length of the bundle.
8428. Components containing phosphate ester-base hydraulic fluid may be cleaned with
A-Stoddard solvent.
8524. Which is considered a good practice concerning the inspection of heating and exhaust systems of aircraft utilizing a jacket around the engine exhaust as a heat source?
A-Supplement physical inspections with periodic operational carbon monoxide detection tests.
8844. What is the minimum bend radius for an electrical wire bundle?
A-Ten times the outside diameter of the bundle.
8591. What will be the result if the instrument static pressure line becomes disconnected inside a pressurized cabin during cruising flight?
A-The altimeter and airspeed indicator will both read low.
8818. In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder?
A-The brush pigtail.
8584. On transport category aircraft what might be an indication of an over pressure event of the aircraft oxygen system?
A-The green thermal expansion disk missing.
8199. Which statement concerning a welding process is true?
A-The inert-arc welding process uses an inert gas to protect the weld zone from the atmosphere.
8766. Which of the following is necessary to effectively troubleshoot a fuel pressure warning system?
A-The manufacturer's maintenance manuals.
8779. What precautions must be observed if a gravity-feed fuel system is permitted to supply fuel to an engine from more than one tank at a time?
A-The tank airspaces must be interconnected.
8714. Before fueling an aircraft by using the pressure fueling method, what important precaution should be observed?
A-The truck pump pressure must be correct for that refueling system.
8181. Which statement is true in regard to welding heat-treated magnesium?
A-The welded section does not have the strength of the original metal.
8787. According to Part 23, what minimum required markings must be placed at or near each appropriate fuel filler cover for reciprocating engine-powered airplanes?
A-The word "Avgas" and the minimum fuel grade.
8978. What method is usually employed to control the temperature of an anti-icing system using surface combustion heaters?
A-Thermo-cycling switches.
8694-2. (Refer to Figure 23.) What kind of antenna is this?
A-This is an altitude encoder used with transponders.
8641. How many of the following are controlled by gyroscopes? 1. Attitude indicator. 2. Heading indicator. 3. Turn needle of the turn-and-slip indicator.
A-Three.
8708. What is the primary purpose of the crossfeed system?
A-To allow the feeding of any engine from any tank.
8311. Why do most aircraft tire manufacturers recommend that the tubes in newly installed tired be first inflated, fully deflated, and then reinflated to the correct pressure?
A-To allow the tube to position itself correctly inside the tire.
8980. What is the purpose of the oil separator in the pneumatic deicing system?
A-To protect the deicer boots from oil deterioration.
8647. What is the primary purpose of an autopilot?
A-To relieve the pilot of control of the aircraft during long periods of flight.
8038. What is the usual cause of runs and sags in aircraft finishes?
A-Too much material applied in one coat.
8701. Which of the following is employed to maintain lateral stability when jettisoning fuel?
A-Two separate independent systems.
8108. What is the minimum edge distance for aircraft rivets?
A-Two times the diameter of the rivet shank.
8707-2. How many vents, arranged so that they are not likely to become plugged at the same time, must be used in multiengine fuel systems?
A-Two.
8799. What can be done to eliminate or minimize the microbial growth problem in an aircraft jet fuel tank?
A-Use anti-icing and antibacterial additives.
8973. What is the source of pressure for inflating deicer boots on reciprocating engine aircraft?
A-Vane-type pump.
8029. Which type of coating typically includes phosphoric acid as one of its components at the time of application?
A-Wash primer.
8663. When must the radio station license be displayed in an aircraft equipped with a two-way radio?
A-When the aircraft is operated outside the U.S.
8667. When must the emergency locator transmitter (ELT) battery be replaced (other than reading the replacement date)?
A-When the transmitter has been in use for more than one cumulative hour.
8946. At what point in the landing operation does normal skid control perform its function?
A-When wheel rotation deceleration indicates an impending skid.
8068. Which is an identifying characteristic of acrylic plastics?
A-Zinc chloride will have no effect.
8587. The operating mechanism of most hydraulic pressure gauges is
A-a Bourdon tube.
8380. An O-ring intended for use in a hydraulic system using MIL-H-5606 (mineral base) fluid will be marked with
A-a blue stripe or dot.
8768. In some aircraft with several fuel tanks, the possible danger of allowing the fuel supply in one tank to become exhausted before the selector valve is switched to another tank is prevented by the installation of
A-a fuel pressure warning signal system.
8198. A welding torch backfire may be caused by
A-a loose tip.
8965. The rotor in magnesyn remote indicating system uses
A-a permanent magnet.
8505. The basic air-cycle cooling system consists of
A-a source of compressed air, heat exchangers, and a turbine.
8913. Aircraft which operate only AC generators (alternators) as a primary source of electrical power normally provide current suitable for battery charging through the use of
A-a stepdown transformer and a rectifier.
8932. When necessary during operation, CSD disconnect is usually accomplished by
A-a switch in the cockpit.
8239. If the right wing of a monoplane is improperly rigged to a greater angle of incidence than designated in the manufacturer's specifications, it will cause the
A-airplane to be off balance both laterally and directionally.
8539. After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and
A-all connections checked for leaks.
8506. The purpose of the dump valve in a pressurized aircraft is to relieve
A-all positive pressure from the cabin.
8171. The purpose of a joggle is to
A-allow clearance for a sheet or an extrusion.
8359. Lockout deboosters are primarily pressure reducing valves that
A-allow full debooster piston travel without fluid from the high pressure side entering the low pressure chamber.
8540. The operation of an aircraft combustion heater is usually controlled by a thermostat circuit which
A-alternately turns the fuel on and off, a process known as cycling.
8190. In selecting a torch tip size to use in welding, the size of the tip opening determines the
A-amount of heat applied to the work.
8435. A unit which transforms hydraulic pressure into linear motion is called
A-an actuating cylinder.
8742. The electronic-type fuel quantity indicating system consists of a bridge circuit,
A-an amplifier, an indicator, and a tank unit.
8943. In an antiskid system, wheel skid is detected by
A-an electrical sensor.
8917. An aircraft electrical circuit control relay is
A-an electrically operated switch.
8963. The rotor in autosyn remote indicating system uses
A-an electromagnet.
8911. If any one generator in a 24-volt DC system shows low voltage, the most likely cause is
A-an out-of-adjustment voltage regulator.
8279. The purpose of spring tabs or servo tabs is to
A-assist the pilot in moving the control surfaces.
8222. One purpose of the freewheeling unit required between the engine and the helicopter transmission is to
A-automatically disengage the rotor from the engine in case of an engine failure.
8858. Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced weight. When bonding open wiring, the bundles should
A-be limited as to the number of cables to minimize damage from a single electrical fault.
8076. What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called
A-bleeder.
8047. The markings on the head of a Dzus fastener identify the
A-body diameter, type of head, and length of the fastener.
8703. Fuel is moved overboard in most fuel jettison systems by
A-boost pump.
8391. (1) Relief valves are used in pneumatic systems as damage-preventing units. (2) Check valves are used in both hydraulic and pneumatic systems. Regarding the above statements,
A-both No. 1 and No. 2 are true.
8431. (1) Materials which are Skydrol compatible or resistant include most common aircraft metals and polyurethane and epoxy paints. (2) Skydrol hydraulic fluid is compatible with nylon and natural fibers. Regarding the above statements,
A-both No. 1 and No. 2 are true.
8700. (1) The fuel jettison valve must be designed to allow flight personnel to close the valve during any part of the jettisoning operation. (2) During the fuel jettison operation, the fuel must discharge clear of any part of the airplane. Regarding the above statements,
A-both No. 1 and No. 2 are true.
8103. Shallow scratches in sheet metal may be repaired by
A-burnishing.
8043. Alloy 2177 rivets are heat treated
A-by the manufacturer and do not require heat treatment before being driven.
8751. One advantage of electrical and electronic fuel quantity indicating systems is that the indicator
A-can be located any distance from the tank(s).
8755. In an electronic-type fuel quantity indicating system, the tank sensing unit is a
A-capacitor.
8126. Rivet gauge, or transverse pitch is the distance between the
A-centers of rivets in adjacent rows.
8876. A circuit breaker is installed in an aircraft electrical system primarily to protect the
A-circuit and should be located as close to the source as possible.
8889. A certain switch is described as a single-pole, double-throw switch (SPDT). The throw of a switch indicates the number of
A-circuits each pole can complete through the switch.
8012. When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by using
A-circular or elliptical patches.
8340. When servicing an air/oil shock strut with MIL-5606 the strut should be
A-collapsed and fluid added at the filler opening.
8213. The vertical flight of a helicopter is controlled by
A-collective pitch changes.
8005. A faint line running across the grain of a wood spar generally indicates
A-compression failure.
8521. The point at which freon flowing through a vapor-cycle cooling system gives up heat and changes from a gas to a liquid is the
A-condenser.
8577. Oxygen systems in unpressurized aircraft are generally of the
A-continuous-flow and pressure-demand types.
8492. The purpose of restrictors in hydraulic systems is to
A-control the rate of movement of hydraulically operated mechanisms.
8840. For general electrical use in aircraft, the acceptable method of attaching a terminal to a wire is by
A-crimping.
8847. The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by
A-crimping.
8908. The most common method of regulating the voltage output of a compound DC generator is to vary the
A-current flowing through the shunt field coils.
8867. The primary considerations when selecting electric cable size are
A-current-carrying capacity and allowable voltage drop.
8196. Acetylene at a line pressure above 15 PSI is
A-dangerously unstable.
8269. The cable-operated control system of an all-metal aircraft, not incorporating a temperature compensating device, has been rigged to the correct tension in a heated hanger. If the aircraft is operated in very cold weather, the cable tension will
A-decrease when the aircraft structure and cables become cold.
8807. If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open
A-depends on the load carried by the generator.
8547. The cabin pressurization modes of operation are
A-differential, unpressurized, and isobaric.
8614. Data transmitted between components in an EFIS are converted into
A-digital signals.
8141. Most rivets used in aircraft construction have
A-dimples.
8264. The purpose of the vertical fin is to provide
A-directional stability.
8297. An aircraft may be flown beyond the 100-hour inspection requirement to reach a place where the inspection can be accomplished, provided it
A-does not exceed 10 flight hours.
8709. Fuel system components must be bonded and grounded in order to
A-drain off static charges.
8284. During inspection of the flight control system of an airplane equipped with differential-type aileron control, side-to-side movement of the control stick will cause
A-each aileron to have greater up travel (from the streamlined position) than down travel.
8695. The addition of avionics and associated antenna system forward of the CG limit will affect
A-empty weight and useful load.
8801. If a blade-type fuel tank is to be left empty for an expended period of time, the inside of the tank should be coated with a film of
A-engine oil.
8462. The air that is expended and no longer needed when an actuating unit is operated in a pneumatic system is
A-exhausted or dumped, usually overboard.
8951. (Refer to Figure 19.) What is the indication of the red landing gear position light under the following conditions? Aircraft on jacks. Landing gear in transit. Warning horn sounding.
A-extinguished.
8081. Fiberglass laminate damage not exceeding the first layer or ply can be repaired by
A-filling with a putty consisting of a compatible resin and clean, short glass fibers.
8710-5. Many fuel tanks incorporate _______________ valves to prevent fuel from flowing away from the boost pump or tank outlet when the aircraft is in a high "G" maneuver.
A-flapper
8753. An electrical-type fuel quantity indicating system consist of an indicator in the cockpit and a
A-float-operated transmitter installed in the tank.
8392. One of the distinguishing characteristics of an open-center selector valve used in a hydraulic system is that
A-fluid flows through the valve in the OFF position.
8356. The left brake is dragging excessively on an airplane on which no recent brake service work has been performed. The most probable cause is
A-foreign particles stuck in the master cylinder compensating port.
8399. What type of selector valve is one of the most commonly used in hydraulic systems to provide for simultaneous flow of fluid into and out of a connected actuating unit?
A-four-port, closed-center valve.
8252. The dihedral angle of a wing may be measured by placing a straightedge and level protractor on the
A-front spar.
8716. Aircraft pressure fueling systems instructional procedures are normally placarded on the
A-fuel control panel access door.
8019. Moisture, mildew, chemicals, and acids have no effect on
A-glass fabric.
8896. The voltage in an AC transformer secondary that contains twice as many loos as the primary will be
A-greater and the amperage less than in the primary.
8094. The coefficient of expansion of most plastic enclosure materials is
A-greater than both steel and aluminum.
8855. Circuits that must be operated only in an emergency of whose inadvertent activation could endanger a system frequency employ
A-guarded switch.
8054. Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction
A-has a high strength to weight ratio.
8795. When routing a fuel line between two rigidly mounted fittings the line should
A-have at least one bend between such fittings.
8326. Power boost brake systems are used on aircraft that have
A-high landing speed.
9005. A carbon dioxide (CO₂) hand-held fire extinguisher may be used on an electrical fire if the
A-horn is nonmetallic.
8048. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in
A-hundredth of an inch.
8463. Some hydraulic systems incorporate a device which is designed to remain open to allow a normal fluid flow in the line, but closed if the fluid flow increases above an established rate. This device is generally referred to as a
A-hydraclic fuse.
8465. A worn hydraulic pump shaft seal can normally be detected by
A-hydraulic fluid flowing from the pump drain line.
8580. Before a high-pressure oxygen cylinder is serviced, it must be the correct type and have been
A-hydrostatically tested within the proper time interval.
8301. An aircraft that is due an annual inspection may be flown
A-if a special permit has been issued for the aircraft.
8304. Large airplanes and turbine-powered multiengine airplanes operated under Federal Aviation Regulation Part 91, General Operating and Flight Rules, must be inspected
A-in accordance with an inspection program authorized under Federal Aviation Regulation Part 91, Subpart E.
8229. If a pilot reports that an airplane flies left wing heavy, this condition may be corrected by
A-increasing the angle of incidence of the left wing, or decreasing the angle of incidence of the right wing, or both.
8483. An emergency supply of fluid is often retained in the main hydraulic system reservoir by the use of a standpipe. The supply line is connected to the
A-inlet of the main hydraulic system.
8863. When using the voltage drop method of checking circuit resistance, the
A-input voltage must be maintained at a constant valve.
8166. Unless otherwise specified, the radius of a bend is the
A-inside radius of the metal being formed.
8812. The method most often used in overcoming the effect of armature reaction is through the use of
A-interpoles.
8950. Stall warning systems are generally designed to begin warning the pilot when a stall
A-is imminent.
8379. A flexible hydraulic hose identified as MIL-H-8788 will have a stripe running the length of the hose. This stripe
A-is used to ensure that the hose is installed without excessive twisting.
9013. A thermocouple in a fire-detection system causes the warning system to operate because
A-it generates a small current when heated.
8243. Improper rigging of the elevator trim tab system will affect the balance of the airplane about its
A-lateral axis.
8227. Wing dihedral, a rigging consideration on most airplanes of conventional design, contributes most to stability of the airplane about its
A-longitudinal axis.
8673. Static dischargers help eliminate radio interference by dissipating static electricity into the atmosphere at
A-low current level.
8346. If an aircraft shock strut (air/oil type) bottoms upon initial landing contact, but functions correctly during taxi, the most probable cause is
A-low fluid.
8134. Under certain conditions, type A rivets are not used because of their
A-low strength characteristics.
8699. The primary purpose of an aircraft's fuel jettison system is to quickly achieve a
A-lower landing weight.
8798. The vapor pressure of aviation gasoline is
A-lower than the vapor pressure of automotive gasoline.
8590. When swinging a magnetic compass, the compensators are adjusted to correct for
A-magnetic influence deviation.
8525. On some cabin pressurization systems, pressurization on the ground is restricted by the
A-main landing gear operated switch.
8401. The purpose of the pressure regulator in a hydraulic system is to
A-maintain system operating pressure within a predetermined range and to unload the pump.
8082. Fiberglass damage that extends completely through a laminated sandwich structure
A-may be repaired.
8411. If a hydraulic brake system uses neoprene rubber packing materials, the correct hydraulic fluid to service the system is
A-mineral base oil.
8420. Two types of hydraulic fluids currently being used in civil aircraft are
A-mineral base, and phosphate ester base.
8519. The main cause of contamination in gaseous oxygen systems is
A-moisture.
8136. Heat-treated rivets in the D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration
A-must be reheat treated before use.
8604. Aircraft temperature thermocouple leads may
A-not be altered and are designed for a specific installation.
8690. A DME antenna should be located in a position on the aircraft that will
A-not be blanked by the wing when the aircraft is banked.
8495. Teflon hose that has developed a permanent set from being exposed to high pressure or temperature should
A-not be straightened or bent further.
8606. The operation of an angle-of-attack indicating system is based on detection of differential pressure at a point where the airstream flows in a direction
A-not parallel to the true angle of attack of the aircraft.
8186. Welding over brazed or soldered joints is
A-not permitted.
8042. A main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the
A-number of locking collar grooves. (2 for shear/5 for tension)
8928. CSD driven generators are usually cooled by
A-oil spray.
8045. The shop head of a rivet should be
A-one and one-half times the diameter of the rivet shank.
8544. An aircraft pressurization cycle is normally considered to be
A-one complete series of events or operations that recur regularly.
8576. (1) Oxygen used in aircraft systems is at least 99.5 percent pure and is practically water free. (2) Oxygen used in aircraft systems is 99.5 percent pure and is hospital quality. Regarding the above statements,
A-only No. 1 is true.
8589. (1) Aircraft instruments are color-coded to direct attention to operational ranges and limitations. (2) Aircraft instruments range markings are not specified by Title 14 of the Code of Federal Regulations but are standardized by aircraft manufacturers. Regarding the above statements,
A-only No. 1 is true.
8794. (1) On a large aircraft pressure refueling system, a pressure refueling receptacle and control panel will permit one person to fuel or refuel any or all fuel tanks of an aircraft. (2) Because of the fuel tank area, there are more advantages to a pressure fueling system in light aircraft. Regarding the above statements,
A-only No. 1 is true. (2) Because of the fuel tank area, there are fewer advantages to a pressure fueling system in light aircraft.
8773. (1) A fuel pressure relief valve is required on an aircraft positive-displacement fuel pump. (2) A fuel relief valve is required on an aircraft centrifugal fuel boost pump. Regarding the above statements,
A-only No. 1 is true. (2) Isn't needed.
8769. (1) The function of a fuel heater is to protect the engine fuel system from ice formation. (2) An aircraft fuel heater cannot be used to thaw ice in the fuel screen. Regarding the above statements,
A-only No. 1 is true. (2) can.
8796. (1) If aviation gasoline vaporizes too readily, fuel lines may become filled with vapor and cause increased fuel flow. (2) A measure of a gasoline's tendency to vapor lock is obtained from the Reid vapor pressure test. Regarding the above statements,
A-only No. 2 is true. (1) If aviation gasoline vaporizes too readily, fuel lines may become filled with vapor and cause decreased fuel flow.
8131. When an MS20470D rivet is installed, its full shear strength is obtained
A-only after a period of age hardening.
8660. When operationally checking an autopilot system on the ground, after the aircraft's main power has been switched on, the autopilot should be engaged
A-only after the gyros come up to speed and the amplifier warms up.
8905. The overvoltage control automatically protects the generator system when excessive voltage is present by
A-opening the shunt field circuit.
8526. The cabin pressure control setting has a direct influence upon the
A-outflow valve opening.
8581. A contaminated oxygen system is normally purged with
A-oxygen.
8670. An emergency locator transmitter (ELT) is normally activated by an inertial switch or equivalent mechanism if subjected to a force of a prescribed intensity and duration. It must activate when the force is applied
A-parallel to the longitudinal axis of the aircraft.
9015. When used in fire-detection systems having a single indicator light, thermal switches are wired in
A-parallel with each other and in series with the light.
8866. To help minimize radio interference a capacitor will largely eliminate and provide a steady direct current if the capacitor is connected to the generator in
A-parallel.
8277. Aircraft flight control trim systems must be designed and installed so that the
A-pilot can determine the relative position of the trim tab from the cockpit.
8825. To test generator or motor armature windings for opens,
A-place armature in a growler and connect a 110V test light on adjacent segments; light should light.
8244. An airplane that has a tendency to gradually increase a pitching moment that has been set into motion has
A-poor longitudinal stability.
8052. Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the
A-possibility of causing delamination.
8065. The length of time that a catalyzed resin will remain in a workable state is called the
A-pot life.
8445. Pressure is a term used to indicate the force per unit are. Pressure is usually expressed in
A-pounds per square inch.
8748. A capacitance-type fuel quantity indicating system measures fuel in
A-pounds.
8325. The primary purpose for balancing aircraft wheel assemblies is to
A-prevent heavy spots and reduce vibration.
8434. The primary function of the flap overload valve is to
A-prevent the flaps from being lowered at airspeeds which would impose excessive structural loads.
8179. In Gas Tungsten Arc (GTA) welding, a stream of inert gas is used to
A-prevent the formation of oxides in the puddle.
8271. Excessive wear on both of the sides of a control cable pulley groove is evidence of
A-pulley misalignment.
8484. To check the air charge in a hydraulic accumulator,
A-reduce all hydraulic pressure, then observe the reading on the accumulator air gauge.
8245. The purpose of wing slats is to
A-reduce stalling speed.
8218. The purpose in checking main rotor blade tracking is to determine the
A-relative position of the blades during rotation.
8408. Generally, the first step in removing an accumulator from an aircraft is to
A-relieve system pressure.
8969. Prior to installation of a pneumatic surface-bonded type deicer boots, on the leading edge of the wing, you should
A-remove all paint from the area to be covered by the deicer boot.
8120. Aircraft structural units, such as spars, engine supports, etc., which have been built up from sheet metal, are normally
A-repairable, using approved methods.
8360. When a properly operating fusible plug has allowed a tire to deflate, the tire should be
A-replaced.
8642. The lubber line on a directional gyro is used to
A-represent the nose of the aircraft.
8874. Bonding connections should be tested for
A-resistance value.
8022. Fabric rejuvenator is used to
A-restore the condition of dope coating.
8372. A landing gear position and warning system will provide a warning in the cockpit when the throttle is
A-retarded and gear is not down and locked.
8964. The basic difference between an autosyn and a magnesyn indicating system is the
A-rotor.
8235. An airplane is controlled directionally about its vertical axis by the
A-rudder.
8960. In most modern hydraulically actuated landing gear systems, the order of gear and fairing door operation is controlled by
A-sequence valve.
8661. Installed radio equipment is protected from damage due to jolts and vibration by
A-shock mounts.
8888. In aircraft electrical systems, automatic reset circuit breakers
A-should not be used as circuit protective devices.
8728. When moving the mixture control on a normally operating into the idle cutoff position, engine RPM should
A-slightly increase before the engine starts to die.
8319. A stripe or mark applied to a wheel rim and extending onto the sidewall of a tube-type tire is a
A-slippage mark.
8945. In the air with the antiskid armed, current cannot flow to the antiskid control box because landing gear
A-squat switch is open.
8117. When straightening members made of 2024-T4, you should
A-straighten cold and reinforce.
8813. The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the
A-strength of the magnetic field.
8062. One method of inspecting a laminated fiberglass structure that has been subjected to damage is to
A-strip the damaged area of all paint and shine a strong light through the structure.
8318. A brake debooster valve is installed in systems where the high pressure of the hydraulic system (3000 psi) is used to operate brakes
A-that are designed to work with lower pressure.
8621. When flags such as NAV, HDG, or GS are displayed on an HSI, the indication is (HSI = Horizontal Situation Indicator)
A-that function is inoperative.
8741. A drip gauge may be used to measure
A-the amount of fuel in the tank.
8915. Major adjustments on equipment such as regulators, contractors, and inverters are best accomplished outside the airplane on test benches with necessary instruments and equipment. Adjustment procedure should be as outlined by
A-the equipment manufacturer.
8260. If all instructions issued by the swaging tool manufacturer are followed when swaging a cable terminal, the resultant swaged terminal strength should be
A-the full rated strength of the cable.
8337. The purpose source for power brakes is
A-the main hydraulic system.
8114. When repairing a small hole on a metal stressed skin, the major consideration in the design of the patch should be
A-the shear strength of the riveted joint.
8066. A category of plastic material that is capable of softening or flowing when reheated is described as a
A-thermoplastic.
8009. Pin knot clusters are permitted in wood aircraft structure provided
A-they produce a small effect on grain direction.
8698. Fuel jettison is usually accomplished
A-though a common manifold and outlet in each wing.
8820. The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily
A-to prevent circuit failure due to terminal disconnection.
8685. A gasket or sealant is used between the antenna mast and fuselage skin
A-to prevent the entry of moisture.
8783. Fuel-boost pumps are operated
A-to provide a positive flow of fuel to the engine.
8675. An aircraft antenna installation must be grounded
A-to the airframe.
8344. If the extended longitudinal axis of the main landing gear wheel assemblies intersects aft of the aircraft, the wheels can be termed as having
A-toe-out.
8533. The function of the condenser in a freon cooling system is to
A-transfer heat from the freon gas to ambient air.
8618. A radar altimeter determines altitude by
A-transmitting a signal and receiving back a reflected signal.
8683. One antenna can be used for the radio range and standard broadcast bands in light aircraft because the
A-two ranges are close together.
8912-2. Static inverters are electronic devices that change DC to AC with the
A-use of an oscillator.
8752. When fuel quantity is measured in pounds instead of gallons, the measurement will be more because fuel volume
A-varies with temperature change.
8308. To prevent a very rapid extension of an oleo shock strut after initial compression resulting from landing impact,
A-various types of valves or orifices are used which restrict the reverse fluid flow.
8999. The types of fire-extinguishing agents for aircraft interior fires are
A-water, carbon dioxide, dry chemical, and halogenated hydrocarbons.
8746-2. A digital fuel totalizer automatically indicates the amount of fuel used, fuel remaining, current rate of consumption, and fuel
A-weight, aboard at takeoff.
8013. Glue deterioration in wood aircraft structure is indicated
A-when a joint has separated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue.
8481. One of the main advantages of skydrol is its
A-wide operating temperature.
8285. A universal propeller protractor used to measure the degrees of aileron travel should be zeroed
A-with the aileron in the NEUTRAL position.
8456. The main system pressure relief valve in a simple hydraulic system equipped with a power control valve should be adjusted
A-with the power control valve held in the CLOSED position.
8573. An aircraft oxygen bottle may be considered airworthy if it has been hydrostatically tested and identified
A-with the test date, DOT number and serial number stamped on the cylinder near the neck.
8276. If control cables are adjusted properly and the control surfaces tend to vibrate, the probable cause is
A-worn attachment fittings.
8011. Laminated wood is sometimes used in the construction of highly stressed aircraft components. This wood can be identified by its
A. parallel grain construction.
8764. A transmitter in a fuel pressure warning system serves what function?
B-Converts fluid pressure to an electrical signal.
8852. What is normally used to bond noncontinuous stainless steel aircraft components?
B-Copper jumpers.
8156. The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-inch and 0.064-inch aluminum sheet, drilled with a No. 30 drill, is
B-5/16. 0.096 + (1/8)(3/2) = 0.2835 (No. 30 drill = 1/8-inch rivet.)
8154. Which rivet is used for riveting magnesium alloy structures?
B-5056 aluminum.
8377. A fully-charged hydraulic accumulator provides
B- a source for additional hydraulic power when heavy demands are placed on the system.
8077. Proper pre-preg composite lay-up curing is generally accomplished by 1. applying external heat. 2. room temperature exposure. 3. adding a catalyst or curing agent to the resin. 4. applying pressure.
B-1 and 4.
8944. Which of the following functions does a skid control system perform? 1. Normal skid control. 2. Normal braking. 3. Fail safe protection. 4. Locked wheel skid control. 5. Touchdown protection. 6. Takeoff protection.
B-1, 3, 4, 5. 1. Normal skid control. 3. Fail safe protection. 4. Locked wheel skid control. 5. Touchdown protection.
8620. Resistance-type temperature indicators using Wheatstone bridge or radiometer circuits may be used to indicate the temperatures of which the following? 1. Free air. 2. Exhaust gas temperature. 3. Carburetor air. 4. Coolant (engine). 5. Oil temperature. 6. Cylinder head temperature.
B-1, 3, 4, and 5.
8140. A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. Alee rivet holes are drilled for 3/32-inch rivets. The length of the rivets to be used will be
B-1/4 inch. 0.080 + (3/32)(3/2) = 0.2206
8137. The dimensions of an MS20430AD-4-8 rivet are
B-1/8 inch in diameter and 1/2 inch long. Diameter 1/32 Length 1/16
8058. When repairing puncture-type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered to
B-100 times the thickness of the metal.
8639. A certificated mechanic may perform
B-100-hour inspections of instruments.
8289. (Refer to Figure 9.) When the outside air temperature is 80°F, select the acceptable 3/16 cable tension range.
B-117 pounds minimum, 140 pounds maximum. (10% tolerance)
8255. Where is fuselage station No. 137 located?
B-137 inches aft of the zero or fixed reference line.
8298. Where would you find the recommended statement for recording the approval or disapproval for return to service of an aircraft after a 100-hour or annual inspection?
B-14 CFR Part 43.
8089. Which of the following are generally characteristic of carbon/graphite fiber composites? 1. Flexibility. 2. Stiffness. 3. High compressive strength. 4. Corrosive effect in contact with aluminum. 5. Ability to conduct electricity.
B-2, 3, and 4.
8694. (Refer to Figure 16.) Which of the antennas shown is a typical glideslope antenna?
B-2.
8143. Which rivet may be used as received without further treatment?
B-2117-T3.
8457. A hydraulic accumulator is charged with an air preload of 1,000 PSI. When a hydraulic system pressure of 3,000 PSI is developed, the pressure on the air side of the accumulator will be
B-3,000.
8174.(Refer to figure 6.) What is dimension D Setback = .252 Bend allowance = .345
B-4.182.
8668. An emergency locator transmitter (ELT) battery must be capable of furnishing power for signal transmission for at least
B-48 hours.
8733. What should be used to remove flux from an aluminum tank after welded repairs?
B-5 percent solution of nitric or sulfuric acid.
8600. Which instrument condition is acceptable and would not require correction? 1. Red line missing. 2. Case leaking. 3. Glass cracked. 4. Mounting screws loose. 5. Case pain chipped. 6. Leaking at line B nut. 7. Will not adjust. 8. Fogged.
B-5.
8176. (Refer to figure 7.) What is dimension F? Setback at D = .095 Setback at E = .068 Bend allowance at D = .015 Bend allowance at E = .112
B-5.936
8160. (Refer to figure 5.) What is the flat layout dimension?
B-6.8 inches.
8024. When testing the strength of Grade A cotton fabric covering an aircraft that requires only intermediate grade, the minimum acceptable strength the fabric must have is
B-70 percent of the original strength for intermediate fabric.
8173. (Refer to figure 6.) Determine the dimensions of A, B, and C in the flat layout. Setback = .252 Bend allowance = .345
B-A = .748, B = 1.496, C = 1.248
8694-8. (Refer to Figure 29.) What kind of antenna is this?
B-A VOR and localizer antenna.
8626. How would an airspeed indicator be marked to show the best rate-of-climb speed (one engine inoperative)?
B-A blue radial line.
8694-4. (Refer to Figure 25.) What kind of antenna is this?
B-A canted antenna.
8037. What is likely to occur if hydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low?
B-A glossy, blush-free finish.
8998. What occurs when a visual smoke detector is activated?
B-A lamp within the indicator illuminates automatically.
8694-10. (Refer to Figure 31.) What kind of antenna is this?
B-A marker beacon receiver antenna.
9018. What method is used to detect the thermal discharge of a built-in fire-extinguisher system?
B-A rupture of the red plastic disk in the thermal discharge line.
8098. What type of bit should be used to drill holes in Plexiglas?
B-A specially modified twist drill.
8694-5. (Refer to Figure 26.) Where is the strongest signal for this antenna?
B-Above the antenna. (At 90° to the length)
8274. With which system is differential control associated?
B-Aileron.
8706. (Refer to Figure 17.) What is the purpose of the pump crossfeed valve?
B-Allow operation of engines from one tank.
8499. In a freon vapor-cycle cooling system, where is cooling air obtained for the condenser?
B-Ambient air.
8921. How are generators rated?
B-Amperes at rated voltage.
8990. What is the principle characteristic of a windshield pneumatic rain removal system?
B-An air blast forms a barrier that prevents raindrops from striking the windshield surface.
8300. Which statement is correct when an aircraft has not been approved for return to service after an annual inspection because of several items requiring minor repair?
B-An appropriately rated mechanic may repair the defects and approve the aircraft for return to service.
8962. When a landing gear safety switch on a main gear strut closes at liftoff, which system is deactivated?
B-Antiskid system.
8314. Why do trie and wheel manufacturers often recommend that the tires on split rim wheels be deflated before removing the wheel from the axle?
B-As a safety precaution in case the bolts that hold the wheel halves together have been damaged or weakened.
8461-2. Seals used with a mineral base hydraulic fluid are identified by which color code?
B-Blue dot or stripe.
8039. Which defect in aircraft finishes may be caused by adverse humidity, drafts, or sudden changes in temperature?
B-Blushing.
8237. Washing-in the left wing of a monoplane, for purposes of rigging corrections after flight test, will have what effect on the lift and drag of that wing?
B-Both drag and lift will increase due to increased angle of attack.
8922. How is a shunt-wound DC generator connected?
B-Both fields are shunted across the armature.
9026. Which fire-extinguishing agent is considered to be the least toxic?
B-Bromotrifluoromethene (Halon 1301).
8472. Which seal/material is used with phosphate ester base hydraulic fluids?
B-Butyl rubber.
8315. The braking action of a Cleveland disk brake is accomplished by compressing a rotating brake disk between two opposite brake linings. How is equal pressure on bolt sides of the rotating disk assured?
B-By allowing the caliper to float to automatically equalize as pressure is applied to the rotor.
8633. How is a flangeless instrument case mounted in an instrument panel?
B-By an expanding-type clamp secured to the back of the panel and tightened by a screw from the front of the instrument panel.
8986. How do deicer boots help remove ice accumulations?
B-By breaking up ice formations.
8355. How can it be determined that all air has been purged from a master cylinder brake system?
B-By nothing whether the brake is firm or spongy.
8458. How is the air in a hydraulic accumulator prevented from entering the fluid system?
B-By physically separating the air chamber from the oil chamber with a flexible or movable separator.
8743. A probe or a series of probes is used in what kind of fuel quantity indicating system?
B-Capacitor.
8725. Which gas is used for purging an aircraft fuel tank?
B-Carbon dioxide.
8500. What is ventilating air used for on a combustion heater?
B-Carries heat to the places where needed.
8832. What does a rectifier do?
B-Changes alternating current into divert current.
8997. In what area of an aircraft would you find a carbon monoxide detecter?
B-Cockpit and/or cabin.
8005-1. Any wooden member that has been overstressed is subject to which type of failure?
B-Compression failure.
8515. What type of oxygen system uses the rebreather bag-type mask?
B-Continuous flow.
8364. What action, if any, should be taken when there is a difference of more than 5 pounds of air pressure in tires mounted as duals?
B-Correct the discrepancy and enter in the aircraft records.
8625. Which of the following instruments will normally have range markings?
B-Cylinder head temperature gauge, airspeed indicator.
8579. If a high-pressure oxygen cylinder is to be installed in an airplane, it must meet the specifications of the
B-Department of Transportation.
8782. What is the one disadvantage of using aromatic aviation fuels?
B-Deteriorates rubber parts.
8545. Which best describes cabin differential pressure?
B-Difference between the ambient and internal air pressure.
8338. Which statement is true with respect to an aircraft equipped with hydraulically operated multiple-disk type brake assemblies?
B-Do not set parking brake when the brakes are hot.
8151. What is generally the best procedure to use when removing a solid shank rivet?
B-Drill to the base of the manufactured rivet head with a drill one size smaller than the rivet shank and remove the rivet with a punch.
8739. What type of remote-reading fuel quantity indicating system has several probes installed in each fuel tank?
B-Electrinic.
8938. A typical takeoff warning indication system, in addition the throttle setting, monitors the position of which of the following?
B-Elevators, speed brake, flaps, and stabilizer.
8836.Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery?
B-Excessive current draw from the battery.
8702. A fuel jettison system is required under certain conditions if the maximum takeoff weight exceeds the maximum landing weight. What regulations cover the requirements of fuel jettisoning?
B-Federal Aviation Regulation Part 23, 25, and CAM 4b.
8977. Which of the following indications occur during a normal operational check of a pneumatic deicer system?
B-Fluctuating readings on the pressure gauge and relatively steady readings on the vacuum gauge.
8809. What is required when operating two aircraft AC generators in parallel?
B-Frequency and voltage must both be equal.
8765. Where is fuel pressure taken for the pressure warning signal on most aircraft engines?
B-Fuel pressure line of the carburetor.
8713. Which of the following precautions is most important during refueling operations?
B-Fuel to be used must be appropriately identified.
9000. When air samples contain carbon monoxide, portable carbon monoxide detectors containing yellow silica gel will turn which color?
B-Green.
8657. Which component is the sensing device in an electromechanical autopilot system?
B-Gyro.
8418. Which is a characteristic of synthetic base hydraulic fluid?
B-High flash point.
8555. What is the condition of the refrigerant as it leaves the condenser of a vapor-cycle cooling system?
B-High-pressure liquid.
8449. Which is true regarding the ground check of a flap operating mechanism which has just been installed?
B-If the time required to operate the mechanism decreases with successive operations, it indicates the air is being worked out of the system.
8877. How should a voltmeter be connected?
B-In parallel with the load.
8634. Cases for electrically operated instruments are made of
B-Iron or steel cases.
8191. Why should a carburizing flame be avoided when welding steel?
B-It hardens the surface.
8989. Why should a chemical rain repellant not be used on a dry windshield?
B-It will restrict visibility.
8811. Which motor would be most likely to have an armature brake?
B-Landing light retraction motor.
8826. What is the color and orientation of the position lights for navigation on civil airplanes?
B-Left side - red, right side - green, rear aft - white.
8125. Which part(s) of a semi-monocoque fuselage prevent(s) tension and compression from bending the fuselage?
B-Longerons and stringers.
8552. What is the condition of the refrigerant as it enters the evaporator of a vapor-cycle cooling system?
B-Low-pressure liquid.
8554. What is the condition of the refrigerant as it leaves the evaporator of a vapor-cycle cooling system?
B-Low-pressure vapor.
8588. What is the fixed line mark attached to the compass bowl of a magnetic compass called?
B-Lubber line.
8145. Which rivets should be selected to join two sheets of .032-inch aluminum?
B-MS20470AD-4-4.
8860. What protection to wires and cables does conduit provide when used in aircraft installations?
B-Mechanical.
8201. What purpose does flux serve in welding aluminum?
B-Minimizes or prevent oxidation.
8427. What is used to flush a system normally serviced with MIL-H-560 hydraulic fluid?
B-Naphtha or varsol.
8529. What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude?
B-Negative pressure relief valve.
8486. How many of this seals are used with petroleum base hydraulic fluids?
B-Neoprene, Buna-N.
8119. Which statement is true regarding a cantilever wing?
B-No external bracing is needed.
8871. Which of the following copper electrical cable sizes should be selected to replace a No. 6 aluminum electrical cable?
B-No. 6.
8709-2. How many engine driven fuel pumps per engine are required for engines requiring fuel pumps?
B-One fuel pump for each engine.
8455. What type of valve in an aircraft hydraulic system permits fluid to flow freely in one direction, but restricts the rate at which fluid is allowed to flow in the other direction?
B-Orifice check valve.
8393. What type of packings should be used in hydraulic components to be installed in a system containing Skydrol?
B-Packing materials made for ester base fluids.
8200. Where should the flux be applied when oxyacetylene welding aluminum?
B-Painted on the surface to be weld and applied to the welding rod.
9007. Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by which instrument?
B-Photoelectric cell.
8149. When riveting dissimilar metals together, what precautions must be taken to prevent an electrolytic action?
B-Place a protective separator between areas of potential electrical difference.
8570. In a high-pressure oxygen system, if the pressure reducer fails, what prevents high-pressure oxygen from entering the system downstream?
B-Pressure relief valve.
8757. What unit would be adjusted to change the fuel pressure warning limits?
B-Pressure-sensitive mechanism.
8760. What unit is generally used to actuate the fuel pressure warning system?
B-Pressure-sensitive mechanism.
8557. When purging a freon air-conditioning system, it is important to release the charge at a slow rate. What is the reason for the slow-rate discharge?
B-Prevent excessive loss of refrigerant oil.
8480. What is the main purpose of a pressurized reservoir in a hydraulic system?
B-Prevent hydraulic pump cavitation.
8441. Excluding lines, which components are required to make up a simple hydraulic system?
B-Pump, reservoir, selector valve, and actuator.
8924. What is the frequency of an alternator dependent upon?
B-RPM.
8582. How should you determine the amount of oxygen in a portable, high-pressure cylinder?
B-Read the pressure gauge mounted on the cylinder?
8715. What flight safety-related advantage does a pressure fueling system provide?
B-Reduce the chances for fuel contamination.
9022. On a periodic check of fire-extinguisher containers, the pressure was not between minimum and maximum limits. What procedure should be followed?
B-Replace the extinguisher container.
8028. what is used to slow the drying time of some finishes and to prevent blush?
B-Retarder.
8912. How can the direction of rotation of a DC electric motor be changed?
B-Reverse the electrical connections to either the field or armature windings.
8132. Which of the following need not be considered when determining minimum rivet spacing?
B-Rivet length.
8067. The classification for high tensile strength fiberglass used in aircraft structures is
B-S-glass.
8650. In which control element of an autopilot system is an attitude indicator?
B-Sensing.
8829. Which type of DC generator is not used as an airplane generator?
B-Series wound.
8432-1. What is commonly used to connect an emergency source of power, and at the same time disconnect the normal hydraulic source from critical parts of a landing gear or wheel braking system for operation (usually when the normal source system fails)?
B-Shuttle valve
8789. What type of fuel-booster pump requires a pressure relief valve?
B-Sliding vane.
8291. Why is it generally necessary to jack an aircraft indoor for weighing?
B-So that air currents do not destabilize the scales.
8097. What is the most common method of cementing transparent plastics?
B-Soak method.
8242. What physical factors are involved in the aspect ratio of airplane wings?
B-Span and chord.
8563. What type of oil is suitable for use in vapor-cycle cooling system?
B-Special high grade refrigeration oil.
8033. Which of the following is a hazard associated with sanding on fabric covered surfaces during the finishing process?
B-Static electricity buildup.
8347. What is the function of a cam incorporated in a nose gear shock strut?
B-Straightens the nosewheel.
8426. If an aircraft hydraulic system requires mineral base hydraulic fluid, but phosphate ester base hydraulic fluid is used, what will be the effect on the system?
B-System will be contaminated, fluid will not blend, and the seals will fail.
8283. If the travel of an airplane's controls is correct but the cables are rigged exceptionally tight, what probable effect will this have when flying the airplane?
B-The airplane will be heavy on the control.
8559. In an operating vapor-cycle cooling system, if the two lines connected to the expansion valve are essentially the same temperature, what does this indicate?
B-The expansion valve is not metering freon properly.
8478. If fluid is added to a reservoir in a constant pressure hydraulic system while the system is pressurized, what will result?
B-The fluid level will increase when system pressure is reduced.
8635. When installing an instrument in an aircraft, who is responsible for making sure it is properly marked?
B-The instrument installer.
8903. The strength of the core of an electromagnet depends upon the material from it is constructed and which of the following?
B-The number of turns of wire in the coil and the amount of current (amperes) passing through the coil.
8468. What happens to the outlet of a constant-displacement hydraulic pump when the hydraulic system pressure regulator diverts the fluid from the system to the reservoir?
B-The output pressure reduces, but the volume remains the same.
8651. What is the operating principle of the sensing device used in an autopilot system?
B-The relative motion between a gyro and its supporting system.
8407. What is one advantage of piston-type hydraulic motors over electric motors?
B-There is no fire hazard if the motor is stalled.
8996. What is used as a temperature-sensing element in an electrically heated windshield?
B-Thermistor. (A special form of electrical resistor whose resistance is a function of its temperature)
8983. What maintains normal windshield temperature control in an electrically heated windshield system?
B-Thermistors.
8658. A fully integrated autopilot controls the aircraft around how many axes?
B-Three.
8815. How many cycles of AC voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor?
B-Three.
8759. What is the purpose of flapper-type check valves in integral fuel tanks?
B-To prevent fuel from flowing away from the boost pumps.
8018. Finishing tape (surface tape) is used for what purpose?
B-To provide additional wear resistance over the edges of fabric forming structures.
8979. What is the purpose of the distributor valve in a deicing system utilizing deicer boots?
B-To sequence the deicer boots inflations symmetrically.
8785. Why are centrifugal-type boost pumps used in fuel systems of aircraft operating at high altitude?
B-To supply fuel under pressure to engine-driven pumps
8115. Which procedure is correct when using a reamer ( 绞刀)to finish a drilled hole to the correct size?
B-Turn the reamer only in the cutting direction.
8907. What is the maximum amount of time a circuit can be in operation and still be an intermittent duty circuit?
B-Two minute.
8436. If is it necessary to adjust several pressure regulating valves in a hydraulic system, what particular sequence, if any, should be followed?
B-Units with the highest pressure setting are adjusted first.
8281. Movement of the cockpit control toward the nose-down position during a ground operational check of the elevator trim tab system will cause the trailing edge of the trim tab to move in which direction?
B-Upward regardless of elevator position.
8613. Which condition would be most likely to cause excessive vacuum in vacuum system?
B-Vacuum relief valve improperly adjusted.
8072. Composite fabric material is considered to be the strongest in what direction?
B-Warp.
8873. Which statement relating to electric wiring is true?
B-When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to-terminal joint is at least equal o the tensile strength of the cable itself.
8664. When would a U.S. resident NOT be required to hold a Federal Communications Commission (FCC) Restricted Radio Telephone Operator Permit to operate two-way aircraft VHF radio equipment?
B-When flying or communicating within the United States.
8093. Which is considered good practice concerning the installation of acrylic plastics?
B-When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided.
8629. What marking color is used to indicate if a cover glass has slipped?
B-White.
8233. The angle of incidence is that acute angle formed by
B-a line parallel to the wing chord and a line parallel to the longitudinal axis of the aircraft.
8724. An aircraft's integral fuel tank is
B-a part of the aircraft structure.
8051. The installation of Cherrymax and Olympic-Lok rivets is accomplished by utilizing
B-a pulling tool.
8857. Oil canning of the sides of aluminum or steel electrical junction bowes is considered to be
B-a shorting hazard.
8937. Antiskid braking systems are generally armed by
B-a switch in the cockpit.
8195. Filing or grinding a weld bead is considered to be
B-a way to bring about strength reduction in joint.
8309. A pilot reports the right brake on an aircraft is spongy when the brake pedal is depressed in a normal manner. The probable cause is
B-air in the brake hydraulic system.
8302. For an individual (not a repair station) to conduct a complete 100-hour inspection on an aircraft and approve it for return to service requires a mechanic certificate with
B-airframe and powerplant ratings.
8617. The function of a display controller in an EFIS is to (EFIS = Electronic Flight Instrument System)
B-allow the pilot to select the appropriate system configuration for the current flight situation.
8241. When the lift of and airfoil increases, the drag will
B-also increase.
8936. An antiskid system is
B-an electrohydraulic system.
8831. During ground operation, aircraft generator cooling is usually accomplished by
B-an integral fan.
8916. A battery-generator system provides direct current. On installations requiring alternating current from the battery-generator system, it is necessary to have
B-an inverter.
8247. Buffeting is the intermittent application of forces to a part of an airplane. It is caused by
B-an unsteady flow from turbulence.
8118. Clad aluminum alloys are used in aircraft because they
B-are less subject to corrosion than uncoated aluminum alloys.
8776. If an aircraft is fueled from a truck or storage tank which is known to be uncontaminated with dirt or water, periodic checks of the aircraft's fuel tank sumps and system stainers
B-are still necessary due to the possibility of contamination from other sources.
8343. Aircraft tire pressure should be checked
B-at least once a week or more often.
8717. Pressure fueling of aircraft accomplished through
B-at least one single point connection.
8050. Threaded rivets (Rivnuts) are commonly used to
B-attach parts or components with screws to sheet metal.
8568. The primary difference between aviation breathing oxygen and other types of commercially available compressed oxygen is that
B-aviation breathing oxygen has had all the water vapor removed.
8549. A pressurization controller uses
B-baromatric pressure, cabin altitude, and cabin rate of change.
8096. Cabin upholstery materials installed in current standard category airplanes must
B-be at least flame resistant.
8530. If the liquid level gauge in a vapor-cycle cooling system indicates a low freon charge, the system should
B-be operated for a period of time to reach a stable-condition and then the freon level rechecked.
8357. If a brake debooster is used in a hydraulic brake system, its position in the system will be
B-between the brake control valve and the brake actuating cylinder.
8771. (1) A fuel heater can use engine bleed air as a source of heat. (2) A fuel heater can use engine lubricating oil as a source or heat. Regarding the above statements,
B-both No. 1 and No. 2 are true.
8772. (1) A fuel pressure gauge is a differential pressure indicator. (2) A fuel pressure gauge indicates the pressure of the fuel entering the carburetor. Regarding the above statements,
B-both No. 1 and No. 2 are true.
9017. In reference to aircraft fire-extinguishing systems, (1) during removal or installation, the terminals of discharge cartridges should be grounded or shorted. (2) before connecting cartridge terminals to the electrical system, the system should be checked with a voltmeter to see that no voltage exists at the terminal connections. Regarding the above statements,
B-both No. 1 and No. 2 are true.
8256. Proper wing twist in a sheet metal constructed wing can usually be checked by utilizing a
B-bubble level and special fixtures described by the manufacturer.
8396. The removal of air from an aircraft hydraulic system is generally accomplished
B-by operating the various hydraulic components through several cycles.
8127. Rivet pitch is the distance between the
B-centers of adjacent rivets in the same row.
8793. The type of fuel-boost pump that separates air and vapor from the fuel before it enters the line to the carburetor is the
B-centrifugal-type pump.
8822. The commutator of generator
B-changes alternating current produced in the armature into direct current as it is taken from the armature.
8536. When servicing an air-conditioning system that has lost all of its freon, it is necessary to
B-check oil and add as necessary, evacuate the system, and add freon.
8607. Turbine engine exhaust gas temperatures are measured by using
B-chromel/alumel thermocouples.
8880. The three kinds of circuit-protection devices used most commonly in aircraft circuits are
B-circuit breakers, fuses, and current limiters.
8982. Two possible sources of heat for the operation of a wing thermal anti-icing system are
B-compressor bleed air and aircraft electrical system.
8966. Microswitches are used primary as limit switches to
B-control electrical units automatically.
8019-1. Fungicide and mildewicide additives are important for fabric covered aircraft, such as
B-cotton and linen.
8890. When considering an alteration, the criteria upon which the selection of electric cable size should be based are
B-current-carrying capacity and allowable voltage drop.
8226. Movement about the lateral axis (pitch) in a helicopter is effected by movement of the
B-cyclic pitch control. (fore and aft)
8225. Movement about the longitudinal axis (roll) in a helicopter is effected by movement of the
B-cyclic pitch control. (to the right and left)
8632. The method of mounting aircraft instruments in their respective panels depends on the
B-design of the instrument case.
9028. A squib, as used in a fire-protection system, is a
B-device for causing the fire-extinguishing agent to be released.
8121. A factor which determines the minimum space between rivets is the
B-diameter of the rivets being used.
8476. Hydraulic fluid filtering elements constructed of porous paper are normally
B-discarded at regular intervals and replaced with new filtering elements.
8615. The function of CRT in an EFIS is to (CRT = Cathode-ray tube)
B-display alphanumeric data and representations of aircraft instruments.
8704. Fuel jettisoning part the limits prescribed by Federal Aviation Regulations is usually prevented by
B-dump limit valves or a low-level circuit.
8850. If several long lengths of electrical cable are to be installed in rigid conduit, the possibility of damage to the cable as it is pulled through the conduit will be reduced by
B-dusting the cable with powdered soapstone.
8608. Fuel flow transmitters are designed to transmit data
B-electrically.
8522. The point at which freon flowing through a vapor-cycle cooling system absorbs heat and changes from a liquid to a gas is the
B-evaporator.
8327. On all aircraft equipped with retractable landing gear, some means must be provided to
B-extend the landing gear if the normal operating mechanism fails.
8814. The pole pieces or shoes used in a DC generator are a part of the
B-field assembly.
8926. Residual voltage is a result of magnetism in the
B-field shoes.
8035. Fungicidal dopes are used in aircraft finishing as the
B-first coat to prevent fabric rotting and are applied thin enough to saturate the fabric.
8433. The primary purpose of a hydraulic actuating unit is to transform
B-fluid pressure into useful work.
8165. If it is necessary to compute a bend allowance problem and bend allowance tables are not available, the neutral axis of the bend can be
B-found by adding approximately one-half of the stock thickness to the bend radius.
8925. The generator rating is usually found stamped on the
B-generator.
8002. The strength of a well-designed and properly prepared wood splice joint is provided by the
B-glue.
8893. One advantage of using AC electrical power in aircraft is
B-greater ease in stepping the voltage up or down.
9016. Built-in aircraft fire-extinguishing systems are ordinarily charged with
B-halogenated hydrocarbons and nitrogen.
8135. A rivet set used to drive MS20470 rivets should
B-have a slightly greater radius than the rivet head.
8378. A hydraulic system referred to as a "power pack" system will
B-have all hydraulic power components located in one unit.
8059. One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to
B-have mixed enough for a test sample.
8878. A circuit protection divide called a current limiter is essentially a slow-blow fuse and is designed to be used in
B-heavy power circuits.
8448. Heat exchanger cooling units are required in some aircraft hydraulic systems because of
B-high pressures and high rates of fluid flow.
8487. Hydraulic system thermal relief valves are set to open at a
B-higher pressure than the system relief valve.
8710-6. Fuel heaters are used with fuel systems for turbine engines to prevent _______________ in the fuel from clogging system filters.
B-ice crystals
8001. Laminated wood spars may be substituted for solid rectangular wood spars
B-if the same quality wood is used in both.
8791. A fuel temperature indicator is located in the fuel tanks on some turbine-powered airplanes to tell when the fuel may be
B-in danger of forming ice crystals.
8381. What condition would most likely cause excessive fluctuation of the pressure gauge when the hydraulic pump is operating?
B-inadequate supply of fluid.
8328. An automatic damping action occurs at the steering damper if for any reason the flow of high-pressure fluid is removed from the
B-inlet of the steering damper.
8323. The repair for an out-of-tolerance toe-in condition of main landing gear wheels determined not to be the result of bent or twisted components consists of
B-inserting, removing, of changing the location of washers or spacers at the center pivotal point of the scissor torque links.
8268. Placing a piece of cloth around a stainless steel control cable and running it back and forth over the length of the cable is generally a satisfactory method of
B-inspecting for broken strands.
9003. A contaminated carbon monoxide portable test until would be returned to service by
B-installing a new indicating element.
8941. The angle-of-attack detector operates from differential pressure when the airstream
B-is not parallel to the true angle of attack of the aircraft.
8645. If a static pressure system check reveals excessive leakage, the leak(s) may be located by
B-isolating portions of the line and testing each portion systematically starting at the instrument connections.
8371. A pilot reports the the brake pedals have excessive travel. A probable cause is
B-lack of fluid in the brake system.
8678. In the landing configuration GPWS typically monitors the radio (radar) altimeter; air data computer; instrument landing system; and (GPWS = Ground Proximity Warning System)
B-landing gear and flap positions.
8184. Engine mount members should preferably be repaired by using a
B-larger diameter tube with fishmouth and rosette welds.
8236. The elevators of a conventional airplane are used to provide rotation about the
B-lateral axis.
8278. Stability about the axis which runs parallel to the line of flight is referred to as
B-lateral stability.
8422. Characteristics of MIL-H-8446 (Skydrol 500 A & B) hydraulic fluid are
B-light purple color, phosphate ester base, fire resistant, butyl rubber seals.
8335. A sleeve, spacer, or bumper ring is incorporated in a landing gear oleo shock strut to
B-limit the extension stroke.
8102. Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are called
B-longerons and stringers.
8681. After an automatic direction finding antenna has been installed, the
B-loop must be calibrated.
8622. Instrument panel shock mounts absorb
B-low frequency, high-amplitude shocks.
8105. When comparing the machining techniques for stainless steel sheet material to those for aluminum alloy sheet, it is normally considered good practice to drill the stainless steel at a
B-lower speed with more pressure applied to the drill.
8527. The function of the evaporator in a freon cooling system is to
B-lower the temperature of the cabin air.
8537. The primary function of the cabin pressurization system outflow valve is to
B-maintain the desired cabin pressure.
8294. When overhauling electrical equipment, all necessary information should be obtained from
B-maintenance instructions published by the aircraft and/or equipment manufacturer.
8192. The most important consideration(s) when selecting welding rod is
B-material compatibility.
8404. If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening
B-may distort the flare.
8846. AN/MS electrical connectors are specifically designed to meet
B-military specifications.
8167. The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the
B-minimum radius of bend.
8053. Metal fasteners used with carbon/graphite composite structures
B-must be constructed of material such as titanium or corrosion resistant steel.
8182. The oxyacetylene flame for silver soldering should be
B-neutral.
8491. If the hydraulic system pressure is normal while the engine-driven pump is running, but there is no pressure after the engine has been shut off, it indicates
B-no air pressure in the accumulator.
8010. The cantilever wing uses
B-no external bracing.
8150. The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to
B-one and one-half times the rivet diameter plus .096 inch.
8069. Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying
B-one or more coats of suitable resin (room-temperature catalyzed) to the surface.
8023. (1) Machine-sewn seams in aircraft covering fabrics may be of the folded-fell or French-fell types (2) A plain lapped seam is never permissible. Regarding the above statements,
B-only No. 1 is true.
8055. (1) When performing a ring (coin tap) test on composite structures, a change in sound may be due to damage or to transition to a different internal structure. (2) The extent of separation damage in composite structures is most accurately measured by a ring (coin tap) test. Regarding the above statements,
B-only No. 1 is true.
8561. (1) A small amount of water in a vapor-cycle cooling system can freeze in the receiver-dryer and stop the entire system operation. (2) Water in a vapor-cycle cooling system will react with refrigerant to form hydrochloric acid which is highly corrosive to the metal in the system. Regarding the above statements,
B-only No. 2 is true. (in the expansion valve)
8531. If the cabin rate of climb is too great, the control should be adjusted to cause the
B-outflow valve to close faster.
8402. A flexible sealing element subject to motion is a
B-packing.
9019.The thermal switches of a bimetallic thermal-switch type fire-detection (single-loop) system are heat-sensitive units that complete circuits at a certain temperature. They are connected in
B-parallel with each other, but in series with the indicator lights.
9002. Smoke detectors which use a measurement of light transmissibility in the air are called
B-photoelectrical devices.
8231. An airplane which has good longitudinal stability should have a minimum tendency to
B-pitch.
8774. The primary purpose of a fuel tank sump is to provide a
B-place where water and dirt accumulations in the tank can collect and be drained.
8369. In shock strut, chevron seals are used to
B-prevent oil from escaping.
8538. One purpose of a jet pump in pressurization and air-conditioning system is to
B-provide for augmentation of airflow in some areas of the aircraft.
8640. An aircraft instrument panel is electrically bonded to the aircraft structure to
B-provode current return paths.
8168. The most important factors needed to make a flat pattern layout are
B-radius, thickness, and degree of bend.
8578. The purpose of the airflow metering aneroid assembly found in oxygen diluter demand regulators is to
B-regulate airflow in relation to cabin altitude when in diluter demand position.
8263. When a fiber or nylon insert-type, self-locking nut can be threaded on a bolt or stud through the insert with only the fingers, it should be
B-rejected.
8397. Pneumatic systems utilize
B-relief valves.
8438. Unloading valves are used with many engine-driven hydraulic pumps to
B-relieve the pump pressure.
8935. In a brake antiskid system, when an approaching skid is sensed, an electrical signal is sent to the skid control valve which
B-relieves the hydraulic pressure on the brake.
8931. If the Integrated Drive Generator (IDG) scavenge oil filter is contaminated with metal, you should
B-remove and replace the IDG.
8032. A correct use for acetone is to
B-remove grease from fabric.
8083. Fiberglass laminate damage that extends completely through one facing and into the core
B-requires the replacement of the damaged core and facing.
8897. If the positive field lead between a generator and a generator control panel breaks and is shorted while the engine is running, a voltmeter connected to generator out-put would indicate
B-residual voltage.
8780. The purpose of the baffle plate in a fuel tank is to
B-resist fuel surging within the fuel tank.
8383. The purpose of an orifice check valve is to
B-restrict flow in one direction and allow free flow in other.
8312. The metering pins in oleo shock struts serve to
B-retard the flow of oil as the struts are compressed.
8087. The part of a replacement honeycomb core that must line up with the adjacent original is the
B-ribbon direction.
8474. A hydraulic motor converts fluid pressure to
B-rotary motion.
9008. Light refraction smoke detectors are activated when the detector
B-sense light reflected from smoke particles passing through a chamber.
8063. When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate
B-separation of the laminates.
8452. The unit which causes one hydraulic operation to follow another in a definite order is called a
B-sequence valve.
8854. When adding a rheostat to a light circuit to control the light intensity, it should be connected in
B-series with the light.
8041. A well-designed rivet joint will subject the rivets to
B-shear loads.
8362. The best safeguards against heat buildup in aircraft tires are
B-short ground rolls, slow taxi speeds, minimum braking, and proper tire inflection.
8432. The hydraulic component that automatically directs fluid from either the normal source or an emergency source to an actuating cylinder is called a
B-shuttle valve.
8205. In gas welding, the amount of heat applied to the material being welded is controlled by the
B-size of the tip opening.
8124. The monocoque fuselage relies largely on the strength of
B-skin and covering.
8234. An airplane's center of lift is usually located aft of its center of gravity
B-so that the airplane will have a nose-heavy tendency.
8249. The primary purpose of stall strips is to
B-stall the inboard portion of the wings first.
8161. If a streamline cover plate is to be hand formed using a form block, a place of dead soft aluminum should first be placed over the hollow portion of the mold and securely fastened in place. The bumping operation should be
B-started by tapping the aluminum lightly around the edges and gradually working down into the center.
8206. Oxygen and acetylene cylinders are made of
B-steel.
8451. Many hydraulic reservoirs contain a small quantity of fluid which is not available to the main system pump. The fluid is retained to
B-supply fluid to the auxiliary pump.
8710-4. Fuel baffles are installed in tanks to prevent _______________ caused by changes in the attitude of the aircraft.
B-surging
8214. A reduction in anti-torque thrust will cause the
B-tail to pivot in the direction of torque rotation around the main rotor axis.
8353. The correct inflation pressure for an aircraft tire can be obtained from
B-the aircraft service manual.
8270. Very often, repairs to a control surface require static rebalancing of the control surface. Generally, flight control balance condition may be determined by
B-the behavior of the trailing edge when the surface is suspended from its hinge points.
8627. The green arc on an aircraft temperature gauge indicates
B-the desirable temperature range.
8333. When an air/oil type of landing gear shock strut is used, the initial shock of landing is cushioned by
B-the fluid being forced through a metering opening.
8848. The pin section of an AN/MS connector is normally installed on
B-the ground side of a circuit.
8163. When a piece of aluminum alloy is to be bent using a minimum radius for the type and thickness of material,
B-the layout should be made so that the bend will be 90° to the grain of the sheet.
8210. If too much acetylene is used in the welding of stainless steel,
B-the metal will absorb carbon and lose its resistance to corrosion.
8074. The strength and stiffness of a properly constructed composite buildup depends primarily on
B-the orientation of the plies to the load direction.
8207. When a butt-welded joint is visually inspected for penetration
B-the penetration should be 100 percent of the thickness of the base metal.
8859. During inspection of the terminal strips of an aircraft electrical system, it should be determined that
B-the terminal studs are anchored against rotation.
8290. Differential control on an aileron system means that
B-the up travel is more than the down travel.
8230. If the vertical fin of a single-engine, propeller-driven airplane is rigged properly, it will generally be parallel to
B-the vertical axis but not the longitudinal axis.
8091. When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and self-locking nuts, the nuts should be
B-tightened to a firm fit, then backed off one full turn.
8686. The preferred location of a VOR antenna on light aircraft is on
B-top of the cabin with the apex of the V pointing forward.
8879. If it is necessary to use an electrical connector where it may be exposed to moisture, the mechanic should
B-use a special moisture-proof type.
8078. When repairing large, flat surfaces with polyester resins, warping of the surface is likely to occur. One method of reducing the amount of warpage is to
B-use short strips of fiberglass in the bonded repair.
9024. If a fire extinguisher cartridge is removed from a discharge valve, it should be
B-used only on the original discharge valve assembly.
8887. Where electric cables must pass through holes in bulkheads, formers ribs, firewalls, etc., the wires should be protected from chafing by
B-using a suitable grommet.
8412. The internal resistance of a fluid which tends to prevent it from flowing is called
B-viscosity.
8849. The voltage output of an alternator may be regulated by controlling the
B-voltage output of the DC exciter.
8430. Phosphate ester base hydraulic fluid is very susceptible to contamination from
B-water in the atmosphere.
9010. A fire-extinguisher container can be checked to determine its charge by
B-weight the container and its contents.
8892. The circuit breaker in the instrument lighting system protects the
B-wiring from too much current.
8307. In brake service work, the term "bleeding brakes" is the process of
B-withdrawing fluid from the system for the purpose of removing air that has entered the system.
8352. If an airplane equipped with master cylinders and single-disk brakes has excessive brake pedal travel, but the brakes are hard and effective, the probable cause is
B-worn brake linings.
8523. How is the cabin pressure of a pressurized aircraft usually controlled?
By an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set.
8671. How may the battery replacement date be verified for an emergency locator transmitter (ELT)?
B— By observing the battery replacement date marked on the outside of the transmitter.
8071. A potted compound repair on honeycomb can usually be made on damages less than
C- 1 inch in diameter.
8410. (Refer to Figure 12.) Which illustration(s) show(s) the correct spiral for teflon backup rings?
C-1 and 3.
8025. When dope-proofing the parts of the aircraft structure that come in contact with doped fabric, which of the following provide an acceptable protective coating? 1. Aluminum foil. 2. Resin impregnated cloth tape. 3. Any one-part type metal primer. 4. Cellulose tape.
C-1 and 4.
8696. How much clearance from the seat bottom is required when installing radio equipment under a seat?
C-1 inch with the seat occupied and subjected to maximum downward seat spring deflection.
8970. Which of the following are found in a laminated integral electrically heated windshield system? 1. Autotransformer. 2. Heat control relay. 3. Heat control toggle switch. 4. 24V DC power supply. 5. Indicating light.
C-1, 2, 3, 5. 1. Autotransformer. 2. Heat control relay. 3. Heat control toggle switch. 5. Indicating light.
8710. A typical large transport aircraft fuel manifold system allows how many of the following? 1. All tanks can be serviced through a single connection. 2. Any engine can be fed from any tank. 3. All engines can be fed from all tanks simultaneously. 4. A damaged tank can be isolated from the rest of the fuel system.
C-1, 2, 3, and 4.
9025. Which of the following are fire precautions which must be observed when working on an oxygen system? 1. Display "No Smoking" placards. 2. Provide adequate fire-fighting equipment. 3. Keep all tools and oxygen servicing equipment free from oil or grease. 4. Avoid checking aircraft ratio or electrical system.
C-1, 2, 3, and 4.
8469. Hydraulic system accumulators serve which of the following functions? 1. Dampen pressure surges. 2. Supplement the system pump when demand is beyond the pump's capacity. 3. Store power for limited operation of components if the pump is not operating. 4. Ensure a continuous supply of fluid to the pump.
C-1, 2, 3.
8403. Which characteristics apply to aircraft hydraulic systems? 1. Minimum maintenance requirements. 2. Lightweight. 3. About 80 percent operating efficiency (20 percent loss due to fluid friction). 4. Simple inspection.
C-1, 2, 4. (100% operating efficiency)
8624. Which instruments are connected to an aircraft's pitot-static system? 1. Vertical speed indicator. 2. Cabin altimeter. 3. Altimeter. 4. Cabin rate-of-change indicator. 5 Airspeed indicator.
C-1, 3 , and 5.
8598. Which of the following instrument discrepancies could be corrected by an aviation mechanic? 1. Red line missing. 2. Case leaking. 3. Glass cracked. 4. Mounting screws loose. 5. Case pain chipped. 6. Leaking at line B nut. 7. Will not adjust. 8. Fogged.
C-1, 4, 5, 6.
8128. (Refer to figure 2.) Select the preferred drawing for proper countersinking.
C-1.
8266. What is the smallest size cable that may be used in aircraft primary control systems?
C-1/8 inch.
8595. The maximum altitude loss permitted during an unpressurized aircraft instrument static pressure system integrity check is
C-100 feet in 1 minute.
8872. In installations where the ammeter is in the generator or alternator lead, and the regulator system does not limit the maximum current that the generator or alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating?
C-100.
8592. The maximum deviation (during level flight) permitted in a compensated magnetic direction indicator installed on an aircraft certificated under Federal Aviation Regulator Part 23 is
C-10°.
8106. A single-lap sheet splice is to be used to repair a section of damaged aluminum skin. If a double row of 1/8-inch rivets is used, the minimum allowable overlap will be
C-13/16 inch. Minimum row distance is 2-1/2D Total overlap = 4D + 2-1/2D = 13/2D
8109. When drilling stainless steel, the drill used should have an included angle if
C-140° and turn at low speed.
8546. Composite oxygen bottles that conform to DOT-E-8162 have a service life of
C-15 years or 10,000 filling cycles whichever occurs first.
8736. When installing a rigid fuel line, 1/2 inch in diameter, at what intervals should the line be supported?
C-16 inches. Rigid fuel lines installed in an aircraft should be supported by clamps or brackets at the distances specified in AC 43.13-1B. For a 1/2-inch line, the supports should be installed every 16 inches along the run of the line.
8056. Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water? 1. Acoustic emission monitoring. 2. X-ray. 3. Backlighting.
C-2 and 3.
8305. Exposure to and/or storage near which of the following is considered harmful to aircraft tires? 1. Low humidity. 2. Fuel. 3. Oil. 4. Ozone. 5. Helium. 6. Electrical equipment. 7. Hydraulic fluid. 8. Solvents.
C-2, 3, 4, 6, 7, 8.
8189. Which of the following can normally be welded without adversely affecting strength? 1. Aircraft bolts. 2. SAE 4130 chrome/molybdenum tubing. 3. Spring steel struts. 4. Most heat-treated steel/nickel alloy components.
C-2.
8417. Which of the following is adversely affected by atmospheric humidity if left unprotected? 1. MIL-H-5606 hydraulic fluid. 2. Skydrol hydraulic fluid. 3. None of the above.
C-2.
8490. Although dents in the heel of a bend are not permissible, they are acceptable in the remainder of the hydraulic tube providing they are less than what percent of the tube diameter?
C-20.
8144. (Refer to figure 3.) Which is the grip length of the flush rivet?
C-3.
8610. Who is authorized to repair an aircraft instrument? 1. A certified mechanic with an airframe rating. 2. A certificated repairman with an airframe rating. 3. A certificated repair station approved for that class instrument. 4. A certificated airframe repair station.
C-3.
8644. When an unpressurized aircraft's static pressure system is leak checked to comply with the requirements of Section 91.411, what aircraft instrument may be used in lieu of a pitot-static system tester? 1. Vertical speed indicator. 2. Cabin altimeter. 3. Altimeter. 4. Cabin rate-of-change indicator, 5. Airspeed indicator.
C-3.
8909. (Refer to Figure 18.) Which of the batteries are connected together incorrectly?
C-3.
8287. (Refer to Figure 8.) Identify the cable that is used in primary control systems and in other places where operation over pulleys is frequent
C-3. (7 strands by 19 wires)
8385. A special bolt in a landing gear attachment requires a torque value of 440 inch-pounds. How many foot-pounds are required?
C-36.6.
8272. Fairleads should never deflect the alignment of a cable more than
C-3°.
9020. (Refer to Figure 21.) Using the chart, determine the temperature range for a fire-extinguishing agent storage container with a pressure of 330 PSIG. (Consider 330 PSIG for both minimum and maximum pressure.)
C-45 to 73°F.
8883. What is the voltage drop for a No. 18 copper wire 50 feet long to carry 12.5 amperes, continuous operation? Use the formula VD = RLA VD = Voltage drop R = Resistance per ft = .00644 L = Length of wire A = Amperes
C-4V.
8146. A sheet metal repair is to be made using two pieces of 0.0625-inch aluminum riveted together. All rivet holes are drilled for 1/8-inch rivets. The length of the rivets to be used will be
C-5/16 inch.
8075. Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength?
C-60:40.
8817. How does the magnetic brake used to stop rotation of an electric motor armature operate?
C-A friction brake is applied by a spring and released by a magnet.
8767. Which of the following would be most useful to locate and troubleshoot an internal fuel tank in an aircraft fuel system?
C-A fuel system schematic.
8961. What landing gear warning device(s) is/are incorporated on retractable landing gear aircraft?
C-A horn or other aural device and a red warning light.
8694-11. (Refer to Figure 32.) What kind of antenna is this?
C-A radar beacon transponder antenna.
8694-6. (Refer to Figure 27.) What kind of antenna is this?
C-A radar beacon transponder antenna.
9009. Why does the Fenwal fire-detection system use spot detectors wired parallel between two separate circuits?
C-A short may exist in either circuit without causing a false fire warning.
8339. What type of valve is used in the brake actuating line to isolate the emergency brake system from the normal power brake control valve system?
C-A shuttle valve.
8254. Where is the buttock line or buttline of an aircraft?
C-A width measurement left or right of, and parallel to, the vertical centerline.
8479. In a hydraulic system that has a reservoir pressurized with turbine-engine compressor bleed air, which unit reduces the air pressure between the engine and reservoir?
C-Air pressure regulator.
8253. Where would you find precise information to perform a symmetry alignment check for a particular aircraft?
C-Aircraft service or maintenance manual.
8419. Which statement about fluids is correct?
C-All fluids readily transmit pressure.
8324. On an air valve core stem, what indicates high-pressure type
C-An embossed letter "H".
8729. Entrained water in aviation turbine fuel is a hazard because of its susceptibility to freezing as it passes through the filters. What are common methods of preventing this hazard?
C-Anti-icing fuel additives and fuel heater.
8006-1. Which statement concerning wood decay is correct?
C-Any form of amount of decay is not permitted.
8955. (Refer to Figure 20.) What is the minimum circumstance that will cause the landing gear warning horn to indicate an unsafe condition?
C-Any gear not down and locked, and one throttle retarded.
8712. What is used in many aircraft to prevent bubbles in the fuel after it leaves the tank when atmospheric pressure is lower than fuel vapor pressure?
C-Boost pumps.
8461. Which seals are used with petroleum base hydraulic fluids?
C-Buna-N.
8719. How is the outlet fuel pressure regulated on a submerged, single speed, centrifugal-type fuel pump?
C-By the pump's design and internal clearances.
8672. How may the operation of an installed emergency locator transmitter (ELT) be verified during aircraft inspection?
C-By tuning a communications receiver to the civil emergency frequency and activating the ELT momentarily within five minutes after the hour.
8891. What is an important factor in selecting aircraft fuses?
C-Capacity matches the needs of the circuit.
8098-1. Which of the following drill bit types work best when drilling an aramid fiber (Kevlar) composite laminate?
C-Carbide W-Point.
8994. What icing condition may occur when there is no visible moisture present?
C-Carburetor ice.
8954. (Refer to Figure 20.) What will illuminate the amber indicator light?
C-Closing the nose, left and right wheel gear full retract switches.
8870. How does the routing of coaxial cables differ from the routing of electrical wiring?
C-Coaxial cables are routed as directly as possible.
8293. Which statement about Airworthiness Directives (ADs) is true?
C-Compliance with an applicable AD is mandatory and must be recorded in the maintenance records.
8722. If it necessary to enter an aircraft's fuel tank, which procedure should be avoided?
C-Conduct the refueling and tank purging operation in an air-conditioned building.
8429. How can the proper hydraulic fluid to be used in an airplane be determined?
C-Consult the aircraft manufacturer's service manual.
8710-7. A transducer in a fuel pressure system serves what function?
C-Converts fluid pressure directly through a transmitter to the indicator.
8261. Which is an acceptable safety device for a castle nut when installed on secondary structures?
C-Cotter pin.
8901. The inductor-type inverter output voltage is controlled by the
C-DC stator field current.
8006. Which statement about wood decay is correct?
C-Decay is not acceptable in any form or amount.
8705. Which procedure must be followed when refueling aircraft with sweptback wings?
C-Defuel the outboard wing tanks first.
8535. Which prevents a sudden loss of pressurization in the event that there is a loss of the pressurization source?
C-Delivery air duct check valve.
8316. If it is determined that spongy brake action is not caused by air in the brake system, what is the next most likely cause?
C-Deteriorated flexible hoses.
8972. What controls the inflation sequence in a pneumatic deicer boot system?
C-Distributor valve.
8985. Which of the following connects vacuum to the deicer boots when the system is not in operation, to hold the boots tightly against the leading edges in flight?
C-Distributor valve.
8015. When and how is finishing tape applied on a fabric-covered aircraft?
C-Doped on after the first or second coat of dope.
8758. Select one means of controlling the fuel temperature on turbine-powered aircraft.
C-Engine bleed air to a heat exchanger.
8827. To what depth is the mica insulation between the commutator bars of a DC generator undercut?
C-Equal to the width of the mica.
8542. (Refer to Figure 13.) Determine what unit is located immediately downstream of the expansion valve in a freon refrigeration system.
C-Evaporator coils.
8317. Many brake types can be adapted to operate mechanically or hydraulically. Which type is not adaptable to mechanical operation?
C-Expander-tube type.
8520. Where does the last stage of cooling in an air-cycle air-conditioning system occur?
C-Expansion turbine.
8180. Which statement best describes magnesium welding?
C-Filler rod should be the same composition as base metal.
8648. Which of the following provides manual maneuverability of the aircraft while the autopilot is engaged?
C-Flight controller.
8684. What characteristics of the installation of a rigid antenna on a vertical stabilizer should be evaluated?
C-Flutter and vibration.
8649. In an autopilot, which signal nullifies the input signal to the aileron?
C-Followup signal.
8100. Select the alternative which best describes the function of the flute section of a twist drill.
C-Forms the cutting edges of the drill point.
8017. How many fabric thickness will be found in a French-fell seam?
C-Four.
8129. What is indicated by a black "smoky" residue streaming back from some of the rivets on an aircraft?
C-Fretting corrosion is occurring between the rivets and the skin.
8747. What is the dielectric (nonconducting material) in a capacitance-type fuel quantity indicating system?
C-Fuel and air in the tank.
8354. What should be checked when a shock strut bottoms during a landing?
C-Fuel level.
8761. What method is used on turbine-powered aircraft to determine when the condition of the fuel is approaching the danger of forming ice crystals?
C-Fuel temperature indicator.
8958. Which repair would require a landing gear retraction test?
C-Gear downlink microswitch.
8957. What safety device is actuated by the compression and extension of a landing gear strut?
C-Ground safety switch.
8178. The aluminum alloys used in aircraft construction are usually hardened by which method?
C-Heat treatment.
8551. What is the condition of the refrigerant as it enters the condenser of a vapor-cycle cooling system?
C-High-pressure vapor.
8995. What should be used to melt the ice in a turbine engine if the compressor is immobile because of ice?
C-Hot air.
8107. Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded?
C-If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction.
8623. Which procedure should you use if you find a vacuum-operated instrument glass loose?
C-Install another instrument.
8744. Why is the capacitance fluid quantity indicating system more accurate in measuring fuel level than a mechanical type?
C-It measures by weight instead of volume.
8886. What is the advantage of a circuit limiter?
C-It will take overload for a short period.
8953. Which of the following conditions is most likely to cause the landing gear warning signal to sound?
C-Landing gear not locked down and throttle retarded.
8656. The elevator channel of an autopilot controls the aircraft about which axis of rotation?
C-Lateral.
8861. Which of the following should be accomplished in the installation of aircraft wiring?
C-Located the bundle above flammable field lines and securely clamp to structure.
8808. What is a cause of generator brush arcing?
C-Low spring tension.
8421. Which of the following lists only desirable properties of a good hydraulic fluid that has chemical stability?
C-Low viscosity, high flash point, high fire point.
8329. What is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut?
C-Maintain correct wheel alignment.
8155. Which rivet is used for riveting nickel-steel alloys?
C-Monel.
8654. What is the main purpose os a servo in an autopilot system?
C-Move the control surface as commanded.
8652. What will occur if an aircraft attitude is changed by its autopilot system in order to correct for an error and the involved control surfaces are returned to streamline by the time the aircraft has reached its correct position?
C-Normal operation.
8040. Which statement is true regarding paint system compatibility?
C-Old wash primer coats may be overcoated directly with epoxy finishes.
8485. How would the air pressure charge in the accumulator be determined if the engine is inoperative, but the system still has hydraulic pressure?
C-Operate a hydraulic unit slowly and note the pressure at which a rapid pressure drop begins as it goes toward zero.
8612. The requirements for testing and inspection of instrument static pressure system required by Section 91.411 are contained in
C-Part 43, appendix E.
8881. If a wire is installed so that it comes in contact with some moving parts, what protection should be given the wire?
C-Pass through conduit.
8030. Which properly applied finish topcoat is the most durable and chemical resistant?
C-Polyurethane.
8376. What device in a hydraulic system with a constant-delivery pump allows circulation of the fluid when no demands are on the system?
C-Pressure regulator.
8512. What test is used to determine the serviceability of an oxygen cylinder?
C-Pressure test with water.
8400. What is the purpose of using backup rings with O-rings in hydraulic systems above 1,500 PSI?
C-Prevent high pressure from extruding the seal between the moving and stationary part.
8439. What safety device is usually located between the driving unit and hydraulic pump drive shaft?
C-Pump drive coupling shear section.
8920. In an AC circuit with no phase lead or lag, which is true?
C-Real power equals apparent power.
8959. Landing gear warning systems usually provide which of the following indications?
C-Red light for unsafe gear, green light for gear down, no light for gear up.
8390. What function does the absolute pressure regulator perform in the pneumatic power system?
C-Regulates the compressor inlet air to provide a stabilized source of air for the compressor.
8952. (Refer to Figure 19.) Which repair should be made if the gear switch was placed in UP position and the gear does not retract?
C-Replace electrical wire No. 12.
8885. What is the advantage of a circuit breaker when compared to a fuse?
C-Resettable and reusable.
8805. Electric wire terminals for most aircraft applications must be what type?
C-Ring.
8718. Which of the following may be used for the repair of fuel leaks on most integral fuel tanks?
C-Riveting and resealing.
8389. Select the valve used in a hydraulic system that directs pressurized fluid to one end of an actuating cylinder and simultaneously directs return fluid to the reservoir from the other end.
C-Selector.
8910. (Refer to Figure 19.) Upon completion of the landing gear extension cycle, the green light illuminated and the red light remained lit. What is the probable cause?
C-Short in the up limit switch.
8975. What may be used to clean deicer boots?
C-Soap and water.
8723. What is the recommended practice for cleaning a fuel tank before welding?
C-Steam clean the tank interior.
8730. As a general rule, which statement is true regarding fuel leaks?
C-Stins, seeps, and heavy seeps, (in addition to running leaks) are considered flight hazards when located in unvented areas of the aircraft.
8974. Which of the following regulates the vacuum of the air pump to hold the deicing boots deflated when the pneumatic deicing system is off?
C-Suction relief valve.
8092. If a new safety belt is to be installed in an aircraft, the belt must conform to the strength requirements in which document?
C-TSO C22.
8583. What may be used as a lubricant on oxygen system tapered pipe thread connections?
C-Teflon tape.
8306. What would be the effect if the piston return spring broke in a brake master cylinder?
C-The brakes would drag.
8611. What does a reciprocating engine manifold pressure gauge indicate when the engine is not operating?
C-The existing atmospheric pressure.
8450. A hydraulic system operational check during ground runup of an aircraft indicates that the wing flaps cannot be lowered using the main hydraulic system, but can be lowered by using the emergency hand pump. Which is the most likely cause?
C-The fluid level in the reservoir is low.
8454. Severe kickback of the emergency hydraulic hand pump handle during the normal intake stroke will indicate which of the following?
C-The hand pump outlet check valve is sticking open.
8413. What is the viscosity of hydraulic fluid?
C-The internal resistance of a fluid which tends to prevent it from flowing.
8106-1. What is the minimum edge distance allowed for aluminum alloy single lap sheet splices containing a single row of rivets as compared to a joint with multiple rows, all rivets being equal in diameter?
C-The minimum edge distance for the single row is equal to that for the multiple row.
8332. What is one effect a restricted compensator port of a master cylinder will have on a brake system?
C-The restriction will cause slow release of the brakes.
8275. Which statement concerning the 100-hour inspection of an airplane equipped with a push-pull tube-type control system is true?
C-The threaded rod ends should be checked for the amount of threaded engagement by means of the inspection hole provided.
8837. How can it be determined if a transformer winding has some of its turns shorted together?
C-The transformer will get hot in normal operation.
8781. What minimum required markings must be placed on or near each appropriate fuel filler cover on utility category aircraft?
C-The word "Avgas" and the minimum fuel grade.
8440. Which valve installed in a hydraulic system will have the highest pressure setting?
C-Thermal relief valve.
9004. Which fire-detection system measures temperature rise compared to a reference temperature?
C-Thermocouple.
8113. What is one of the determining factors which permits machine countersinking when flush riveting?
C-Thickness of the material is greater than the thickness of the rivet head.
8694-1. (Refer to Figure 22.) What kind of antenna is this?
C-This is a loop and sense antenna.
8110. What is the minimum spacing for a single row of aircraft rivets?
C-Three times the diameter of the rivet shank.
8099. What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?
C-To join and reinforce intersecting structural members.
8786.Why is it necessary to vent all aircraft fuel tanks?
C-To limit pressure differential between the tank and atmosphere.
8884. What is the purpose of the selection of derated switches for known continuous load current applications?
C-To obtain reasonable switch efficiency and service life.
8894. Why are the iron cores of most induction coils laminated?
C-To reduce the effects of eddy currents.
8775. Why are integral fuel tanks used in many large aircraft?
C-To reduce weight.
8133. What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment?
C-To retard age hardening.
8036. Before applying a protective coating to any unpainted clean aluminum, you should
C-avoid touching the surface with bare hands.
8212. The auxiliary (tail) rotor of a helicopter permits the pilot to compensate for and/or accomplish which of the following?
C-Torque and directional control.
8223. Which statement is correct concerning torque effect on helicopters?
C-Torque direction is the opposite of rotor blade rotation.
8258. What nondestructive checking method is normally used to ensure that the correct amount of swaging has taken place when installing swaged-type terminals on aircraft control cable?
C-Use a terminal gauge to check the diameter of the swaged portion of the terminal.
8556. In what position should the bottle be placed when adding liquid freon to a vapor-cycle cooling system?
C-Vertical with the outlet at the bottom.
8073. What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?
C-Warp clock (or compass).
8080. When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?
C-Water only.
8185. What method of repair is recommended for a steel tube longeron dented at a cluster?
C-Welded patch plate.
8567. In the diluter demand oxygen regulator, when does the demand valve operate?
C-When the user breathes.
8976. Some aircraft are protected against airframe icing by heating the leading edges of the airfoils and intake ducts. When is this type of anti-ice system usually operated during flight?
C-Whenever icing conditions are first encountered or expected to occur.
8756. What must each fuel quantity indicator be calibrated to read during level flight when the quantity of fuel remaining is equal to the unusable fuel supply?
C-Zero.
8930. Integrated drive generators (IDG) employ a type of high output AC generator that utilizes
C-a brushless system to produce current.
8395. An aircraft pneumatic system, which incorporates an engine-driven multistage reciprocating compressor, also requires
C-a moisture separator.
8004. In case of elongated boltholes in a wood spar or cracks in the vicinity of boltholes,
C-a new section of spar should be spliced in or the spar replaced entirely.
8489. If hydraulic fluid is released when the air valve core of the accumulator is depressed, it is evidence of
C-a ruptured diaphragm or leaking seals.
8804. One purpose of a growler test is to determine the presence of
C-a short armature.
8939. The primary purpose of a takeoff warning system is to alert the crew that a monitored flight control is not properly set prior to takeoff. The system is activated by
C-a thrust lever.
8929. A CSD unit drives a generator through the use of
C-a variable hydraulic pump and hydraulic motor.
8659. Dutch roll, a combination yawing and rolling oscillation that affects many sweptwing aircraft, is counteracted with
C-a yaw damper system.
8784. Flapper valves are used in fuel tanks to
C-act as check valves.
8209. Edge notching is generally recommended in butt welding above a certain thickness of aluminum because it
C-aids in getting full penetration of the metal and prevents local distortion.
8517. Hot compressor bleed air operates the conditioned air system on some turbine aircraft, cold air supplied by the
C-air cycle air conditioning.
8488. Chatter in a hydraulic system is caused by
C-air in the system.
8687. The purpose of a localizer is to
C-align the airplane with the center of the runway.
8918. The purpose of a rectifier in an electrical system is to change
C-alternating current to direct current.
8594. Instrument static system leakage can be detected by observing the rate of change in indication of the
C-altimeter after suction has been applied to the system to cause a prescribed equivalent altitude to be indicated.
8619. A radar altimeter indicates
C-altitude above ground level.
8746. A fuel totalizer is a component which indicates the
C-amount of fuel in all tanks.
8853. Aircraft fuse capacity is rated in
C-ampares.
8351. A high-speed aircraft tire with a sound cord body and bead may be recapped
C-an indefinite number of times.
8142. MS20426AD-6-5 indicates a countersunk rivet which has
C-an overall length of 5/16 inch.
8084. Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in
C-an unairworthy repair.
8216. The acute angle formed by the chord line of a wing and the relative wind is known as the
C-angle of attack.
8248. Movement of an airplane along its lateral axis (roll) is also movement
C-around or about the longitudinal axis controlled by the ailerons.
8394. Relief valves are used in pneumatic systems
C-as damage-preventing units.
8669. The preferred location of an ELT is
C-as far aft as possible, but forward of the vertical fin.
8697. The purpose of a glideslope system is to
C-assist the pilot in making a correct angle of descent to the runway.
8666. When installing coaxial cable, it should be secured firmly along its entire length
C-at 2-foot intervals.
8014. Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface
C-at right angles to the grain.
8406. Extrusion of an O-ring seal is prevented in a high-pressure system by the use of a
C-backup ring on the side of the O-ring away from the pressure.
8862. If the (+) terminal of a voltmeter is connected to the (-) terminal of the source voltage and the (-) terminal of the mete is connected to the (+) terminal of the source voltage, the voltmeter will read
C-backwards.
8169. A piece of sheet metal is bent to a certain radius. The curvature of the bend is referred to as the
C-bend radius.
8501. Turbine engine air used for air-conditioning and pressurization is generally called
C-bleed air
8425. Characteristics of MIL-H-7644 hydraulic fluid are
C-blue color, vegetable base, will burn, natural rubber seals.
8790. To prevent vapor lock in fuel lines at high altitude, some aircraft are equipped with
C-booster pumps.
8415. (1) When servicing aircraft hydraulic systems, use the type fluid specified in the aircraft manufacturer's maintenance manual or on the instruction plate affixed to the reservoir or unit. (2) Hydraulic fluids for aircraft are dyed a specific color for each type of fluid. Regarding the above statements,
C-both No. 1 and No. 2 are true.
8548. (1) Usually bleed air from a gas-turbine engine compressor can be safety used for cabin pressurization. (2) Independent cabin condition air machines (air cycle machine) can be powered by bleed air from an aircraft turbine engine compressor. Regarding the above statements,
C-both No. 1 and No. 2 are true.
8575. The purpose of pressurizing aircraft cabins is to (1) create the proper environment for prevention of hypoxia. (2) permit operation at high altitudes. Regarding the above statements,
C-both No. 1 and No. 2 are true.
8770. (1) Gas-turbine-engine fuel systems are very susceptible to the formation of ice in the fuel filters. (2) A fuel heater operates as a heat exchanger to warm the fuel. Regarding the above statements,
C-both No. 1 and No. 2 are true.
8839. (1) There are three basic types of DC motors; series, shunt, and compound. (2) In the series motor, the field windings, consisting of relatively few turns of heavy wire, are connected in series with the armature winding. Regarding the above statements,
C-both No. 1 and No. 2 are true.
8942. (1) When an airplane is slowed below approximately 20 MPH, the antiskid system automatically deactivates to give the pitot full control of the brakes for maneuvering and parking. (2) An antiskid system consists basically of three components; wheel speed sensor, control box, and control valves. Regarding the above statements,
C-both No. 1 and No. 2 are true.
8947. (1) An antiskid system is designed to apply enough force to operate just below the skid point. (2) A warning lamp lights in the cockpit when the antiskid system is turned off or if there is a system failure. Regarding the above statements,
C-both No. 1 and No. 2 are true.
8968. (1) A DC-selsyn system is a widely used electrical method of indicating a remote mechanical movement. (2) A synchro-type indicating system is an electrical system used for transmitting information from one point to another. Regarding the above statements,
C-both No. 1 and No. 2 are true.
8676. VHF radio signal are commonly used in
C-both VOR navigation and ATC communications.
8603. A turn coordinator instrument indicates
C-both roll and yaw.
8564. When an aircraft's oxygen system has developed a leak, the lines and fittings should be
C-bubble tested with a special soap solution manufactured specifically for this purpose.
8899. The major advantages of alternating current (AC) over direct current (DC) is the fact that its current and voltage can easily be increased or decreased
C-by means of a transformer.
8296. Radio equipment installations made in accordance with Supplemental Type Certificate data require approval for return to service
C-by the holder of an inspection authorization.
8737. The probe of a capacitance-type fuel level gauge is essentially a
C-capacitor with fuel and air acting as a dielectric.
8375. Nose gear centering cams are used in many retractable landing gear systems. The primary purpose of the centering device is to
C-center the nosewheel before it enters the wheel well.
8692. When installing a DME antenna, it should be aligned with the
C-centerline on the airplane.
8562. When Refrigerant-12 is passed over an open flame, it
C-changes to phosgene gas.
8257. The vast majority of aircraft control cables are terminated with swaged terminals, that must be
C-checked with a go-no-go gauge before and after, to show compliance with the manufacturer's requirements after the swaging operation.
8731. The presence of fuel stains around a fuel nozzle would indicate
C-clogged fuel nozzle.
8342. The purpose of a relief valve in a brake system is to
C-compensate for thermal expansion.
8727. The purpose of a diaphragm in a vane-type fuel pump is to
C-compensate fuel pressures to altitude changes.
8984. Arcing in an electrically heated windshield panel usually indicates a breakdown in the
C-conductive coating.
8442. Most variable displacement aircraft hydraulic pumps in use
C-contain a built-in means of system pressure regulation.
8197. Cylinders used to transport and store acetylene
C-contain acetone.
8206-2. High pressure cylinders used to transport and store acetylene must
C-contain acetone.
8503. The cabin pressure of an aircraft in flight is maintained at the selected altitude by
C-controlling the rate at which air leaves the cabin.
8560. The purpose of a subcooler in a valve-cycle cooling system is to
C-cool the freon to prevent premature vaporization.
8194. A very thin and pointed tip on a soldering copper is undesirable because it will
C-cool too rapidly.
8090. If an aircraft's transparent plastic enclosures exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be
C-crazing.
8882. In the American Wire Gauge (AWG) system of numbers used to designate electrical wire sizes, the number assigned to a size is related to its
C-cross-sectional area.
8027. If masking tape is applied to an aircraft such as for trim spraying, and is left on for several days and/or exposed to heat, it is likely that the tape will
C-cure to the finish and be very difficult to remove.
8864. The nominal rating of electrical switches refers to continuous
C-current rating with the contacts closed.
8593. Magnetic compass bowls are filled with a liquid to
C-dampen the oscillation of the float.
8361. Chines are used on some aircraft nose wheel tires to help
C-deflect water away from the fuselage.
8286. The universal propeller protractor can be used to measure
C-degrees of flap travel.
8473. A hydraulic pump is a constant-displacement type if it
C-deliver a uniform rate of fluid flow.
9012. The most common cause of false fire warnings in continuous-loop fire-protection system is
C-dents,kinks, or crushed sensor sections.
9001. Smoke detection instruments are classified by their method of
C-detection.
8834. When a diode is checked for an open circuit or a short circuit, it should be
C-disconnected from the circuit.
8246. The angle of incidence of an airplane at rest
C-does not change when in flight.
8282. If the control stick of an aircraft with properly rigged flight controls is moved forward and to the right, the left aileron will move
C-down and the elevator will move down.
8280. If the control stick of an aircraft with properly rigged flight controls is moved rearward and to the left, the right aileron will move
C-down and the elevator will move up.
9006. The proper fire-extinguishing agent to use on an aircraft brake fire is
C-dry powder chemical.
8605. A synchro transmitter is connected to a synchro receiver
C-electrically with wire.
8405. The installation of a new metal hydraulic line should be made with
C-enough bends to allow the tube to expand and contract with temperature changes and to absorb vibration.
8336. The purpose of a sequence valve in a hydraulic retractable landing gear system is to
C-ensure operation of the landing gear and gear doors in the proper order.
8368. When an empty shock strut is filled with fluid, care should be taken to extend and compress the strut completely at least two times to
C-ensure proper packing ring seating and removal of air bubbles.
8446. If two actuating cylinders which have the same cross-sectional area but different lengths of stroke are connected to the same source of hydraulic pressure, they will exert
C-equal amounts of force and will move at the same rate of speed.
8586. An aircraft magnetic compass is swung to update the compass correction card when
C-equipment is added that could effect compass deviation.
8541. The air-cycle cooling system produces cold air by
C-extracting heat energy across an expansion turbine.
8320. When bleeding aircraft brakes, one of the indications that the air has been purged from the system is
C-firm brake pedals.
8204. Oxides form very rapidly when alloys or metals are hot. It is important, therefore, when welding aluminum to use a
C-flux.
8778. Integral fuel tanks on transport aircraft are
C-formed by the aircraft structure.
8532. The position of the thermostatic expansion valve in a vapor-cycle cooling system is determined by temperature and pressure of the
C-freon in the outlet of the evaporator.
8869. Electric circuits are protected from overheating by means of
C-fuses.
8571. High-pressure cylinders containing oxygen for aviation use can be identified by their
C-green color and the words "AVIATOR'S BREATHING OXYGEN" stenciled in 1-inch white letters.
8444. After installation of a rebuilt hydraulic hand pump, it is found that the handle cannot be moved in the pumping direction (pressure stroke). The most likely cause is an incorrectly installed
C-hand pump outport check valve.
8211. The shielding gases generally used in the Gas Tungsten Arc (GTA) welding of aluminum consist of
C-helium or argon, or a mixture of helium and argon.
8810. The starting current of a series-wound DC motor, in passing through both the field and armature windings, produces a
C-high starting torque.
8341. Instructions concerning the type of fluid and amount of air pressure to be put in a shock strut are found
C-in the aircraft manufacturer's service manual.
8777. Aircraft refueling should be accomplished
C-in the open air for good ventilation.
8511. Frost or ice buildup on a vapor-cycle cooling system evaporator would most likely be caused by
C-inadequate airflow through the evaporator.
8665. Part of the ADF system used on aircraft includes (ADF = Automatic Direction Finder)
C-sense and loop antennas.
8906. When DC generators are operated in parallel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by
C-increasing the output of the low generator and decreasing the output of the high generator until they are equal.
8821. Aluminum wire must be stripped very carefully because
C-individual strands will break easily after being nicked.
8493. A common cause of slow actuation of hydraulic components is
C-internal leakage in the actuating unit.
8494. A loud hammering noise in a hydraulic system having an accumulator usually indicates
C-internal leakage in the actuating unit.
8835. When handing a high voltage capacitor in an electrical circuit, be sure it
C-is fully discharged before removing it from the circuit.
8085. The preferred way to make permanent repairs on composites is by
C-laminating on new repair plies.
8475. A crossflow valve which is designed to bypass fluid from one side of an actuating cylinder to the other side, under certain conditions, may be found in some aircraft installed in the
C-landing gear system.
8240. The chord of a wing is measured from
C-leading edge to trailing edge.
8477. A pilot reports that when the hydraulic pump is running, the pressure is normal. However, when the pump is stopped, no hydraulic pressure is available. This is an indication of a
C-leaking accumulator air valve.
8220. If a single-rotor helicopter is in forward horizontal flight, the angle of attach of the advancing blade is
C-less than the retreating blade.
8710-2. A fuel system must be designed to prevent fuel-vapor ignition caused by
C-lightning.
8437. If an aircraft's constant-pressure hydraulic system cycles more frequently than usual and no fluid leakage can be detected, the most probable cause is
C-low accumulator air preload.
8543. When checking a freon system, a steady stream of bubbles in the sight gauge indicates the charge is
C-low.
8553. The evacuation of a vapor-cycle cooling system removes any water that may be present by
C-lowering the boiling point of the water and drawing out the vapor.
8313. After performing maintenance on an aircraft's landing gear system which may have affected the system's operation, it is usually necessary to
C-make an operational check with the aircraft on jacks.
8496. In a typical high-pressure pneumatic system, if the moisture separator does not vent accumulated water when the compressor shuts down, a likely cause is a
C-malfunctioning solenoid dump valve.
8934. The purpose of antiskid generators is to
C-measure wheel rotational speed and any speed changes.
8363. The fusible plugs installed in some aircraft wheels will
C-melt at a specified elevated temperature.
8711. The use of turbine fuels in aircraft has resulted in some problems not normally associated with aviation gasolines. One of these problems is
C-microbial contaminants.
8382. A filter incorporating specially treated cellulose paper is identified as a
C-micronic filter.
8638. The red radial lines on the face of an engine oil pressure gauge indicates
C-minimum and/or maximum safe operating limits.
8565. If oxygen bottle pressure is allowed to drop below a specified minimum, it may cause
C-moisture to collect in the bottle.
8819. A series-wound DC electric motor will normally require
C-more current at low RPM than at high RPM.
8803. Some electric motors have two sets of fluid windings wound in opposite directions so that the
C-motor can be operated in either direction.
8232. As the angle of attack of an airfoil increases, the center of pressure will
C-move toward the leading edge.
8949. The pneumatic (reed) type stall warning system installed in some light aircraft is activated by
C-negative air pressure.
8646. When performing the static system leakage check required by Section 91.411, the technician utilizes
C-negative pressure.
8172. When bending metal, the material on the outside of the curve stretches while the material on the inside of the curve compresses. That part of the material which is not affected by either stress is the
C-neutral line.
8482. Hydraulic fluid reservoirs are sometimes designed with a standpipe in one of the outlet ports in order to assure emergency supply of fluid. The outlet port with the standpipe in it furnishes fluid to the
C-normal system power pump.
8637. A certificated mechanic with airframe and powerplant ratings may
C-not perform repairs to aircraft instruments. (Only by certificated repair station that has approval for the specific instrument.)
8788. The location of leaks and defects within the internal portions of the fuel system can usually be determined by
C-observing the pressure gauge and operating the selector valve.
8175. The sight line on a sheet metal flat layout to be bent in a cornice or box brake is measured and marked
C-one radius from the bend tangent line that is placed under the brake.
8940. (1) An airspeed indicator measures the differential between pitot and static air pressures surrounding the aircraft at any moment of flight. (2) An airspeed indicator measures the differential between pitot and cabin air pressures at any moment of flight. Regarding the above statements,
C-only No. 1 is true.
8745. One advantage of electrical and electronic fuel quantity indicating systems is that
C-several fuel tank levels can be read on one indicator.
8662. (1) Use solder to attach bonding jumpers on radio equipment. (2) Radio equipment is bonded to the aircraft in order to provide a low-impedance ground and to minimize radio interference from static electrical charges. Regarding the above statements.
C-only No. 2 is true.
8933. A CSD unit that is disconnected in flight, due to a malfunction such as overtemperature, may be reconnected
C-only on the ground by maintenance personnel.
8792. When inspecting a fuel system, you should check all valves located downstream of boost pumps with the pumps
C-operating.
8816. If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature
C-opposite the normal direction and through the shunt field in the normal direction.
8516. The altitude controller maintains cabin altitude by modulation of the
C-outflow valve.
8367. Excessive wear in the center of the tread of an aircraft tire is an indication of
C-overinflation.
8856. If one switch is used to control all navigation lights, the lights are most likely connected
C-parallel to each other and in series with the switch.
8116. Repairs or splices involving stringers on the lower surface of stressed skin metal wings are usually
C-permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface.
8851. Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to
C-prevent development of radio frequency potentials.
8330. The removal, installation, and repair of landing gear tires by the holder of a private pilot certificate on an aircraft owned or operated is considered to be
C-preventive maintenance.
8348. Extension of an oleo shock strut is measured to determine the
C-proper operating position of the strut.
8707. Normal fuel crossfeed system operation in multi-engine aircraft
C-provides a means to maintain a balanced fuel load condition.
8471. Quick-disconnect couplings in hydraulic systems provide a means of
C-quickly connecting and disconnecting hydraulic lines without loss of fluid or entrance of air into the system.
8823. An armature in a battery charging system is for the purpose of indicating the
C-rate of current used to charge the battery.
9014. The thermocouple fire-warning system is activated by a
C-rate-of-temperature rise.
8679. In general, the purpose of an aircraft transponder is to
C-receive an interrogation signal from a ground station and automatically send a reply back.
8616. The function of a symbol generator (SG) in an EFIS is to
C-recieve and process input signals from the aircraft and engine sensors and send the data to the appropriate display.
8895. Certain transport aircraft use AC electrical power for all normal operation and battery furnished DC electrical power for standby emergency use. In aircraft of this type that operate no DC generators, the batteries are kept charged by
C-rectifiers which use the aircraft's AC generators as a source of power.
8424. Characteristics of MIL-H-5606 hydraulic fluid are
C-red color, petroleum base, will burn, synthetic rubber seals.
8923. The poles of generator are laminated to
C-reduce eddy current losses.
8322. Debooster valves are used in brake systems primarily to
C-reduce the pressure and release the brakes rapidly.
8534. The function of an expansion valve in a freon cooling system is to act as a metering device and to
C-reduce the pressure of the liquid freon.
8349. Debooster cylinders are used in brake systems primarily to
C-reduce the pressure to the brake and increase the volume of fluid flow.
8008. The I-beam wooden spar is routed to
C-reduce weight.
8031. Aluminum-pigment in dope is used primarily to
C-reflect ultraviolet from the fabric.
8682. Doublers are used when antennas are installed to
C-reinstate the structural strength of the aircraft skin.
8370. On most aircraft, the oil level of an air and oil shock strut is checked by
C-releasing the air and seeing that the oil is to the level of the filer plug.
8467. Before removing the filler cap of a pressurized hydraulic reservoir, in order to service the system, you must
C-relieve the air pressure.
8453.The purpose of a hydraulic pressure regulator is to
C-relieve the pump of its load when no actuating units are being operated.
8208. Annealing of aluminum
C-removes stresses caused by forming.
9027. Maintenance of fire-detection systems includes the
C-replacement of damaged sensing elements.
8904. A voltage regulator controls generator voltage by changing the
C-resistance of the generator field circuit.
8466. If an engine-driven hydraulic pump of the correct capacity fails to maintain normal system pressure during the operation of a cowl flap actuating unit, the probable cause is
C-restriction in the pump outlet.
8288. A tension regulator in the flight control cable system of a large all-metal aircraft is used primarily to
C-retain a set tension.
8123. Parts fabricated from Alclad 2024-T3 aluminum sheet stock must have all
C-scratches, kinks, tool marks, nicks, etc., held to a minimum.
8398. The component in the hydraulic system that is used to direct the flow of fluid is the
C-selector valve.
8020. The best method of repair for a fabric-covered surface which has an L-shaped tear, each leg of which is approximately 14 inches long, is to
C-sew with a baseball stitch from the center of the tear out toward the extremity of each leg and then dope on a patch.
8152. Joggles in removed rivet shanks would indicate partial
C-shear failure.
8443. In a gear-type hydraulic pump, a mechanical safety device incorporated to project the pump from overload is the
C-shear pin.
8902. When using an ohmmeter to check the continuity of a generator field coil, the coil should
C-show very low resistance if it is a series field coil.
8868. The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a
C-single-pole, single-throw (SPST), two-position switch.
8049. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in
C-sixteenth of an inch.
8680. When an antenna is installed, it should be fastened
C-so that loads imposed are transmitted to the aircraft structure.
8148. A DD rivet is heat treated before use to
C-soften to facilitate riveting.
8130. The identifying marks on the heads of aluminum alloy rivets indicate the
C-specific alloy used in the manufacture of the rivets.
8016. The determining factor(s) for the selection of the correct weight of textile fabric to be used in covering any type of aircraft is the
C-speed of the aircraft and the maximum wing loading.
8373. An electric motor used to raise and lower a landing gear would most likely be a
C-split field series-wound motor.
8865. Aircraft electrical junction boxes located in a fire zone are usually constructed of
C-stainless steel.
8147. Mild steel rivets are used for riveting
C-steel parts.
8350. If a shock strut bottoms after it has been properly serviced, the
C-strut should be removed, disassembled, and inspected.
8177. On a sheet metal fitting layout with a single bend, allow for stretching by
C-subtracting the setback from both legs.
8021. The strength classification of fabrics used in aircraft covering is based on
C-tensile strength.
8170. You can distinguish between aluminum and aluminum alloy by
C-testing with a 10 percent solution of caustic soda.
8470. Chattering of the hydraulic pump during operation is an indication
C-that air is entering the pump.
8914. During inspection of an anti collision light installation for condition and proper operation, it should be determined that
C-the anti collision light can be operated independently of the position lights.
8927. In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read,
C-the component has continuity and is not open.
8374. When installing a chevron-type seal in an aircraft hydraulic cylinder, the open side of the seal should face
C-the direction of fluid pressure.
8459. After a hydraulic accumulator has been installed and air chamber charged, the main system hydraulic pressure gauge will not show a hydraulic pressure reading until
C-the fluid side of the accumulator has been charged.
8763. A fuel pressure warning switch contacts close and warning light is turned on when
C-the fuel pressure drops below specified limits.
8057. When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that
C-the grain is perpendicular to the skin.
8334. Internal leakage in a brake master cylinder unit can cause
C-the pedal to slowly creep down while pedal pressure is applied.
8259. When inspecting a control cable turnbuckle for proper installation, determine that
C-the safety wire ends are wrapped a minimum of four turns around the terminal end shanks.
8630. Aircraft instruments should be marked and graduated in accordance with
C-the specific aircraft maintenance or flight manual.
8046. One of the main advantages of Hi-Lok type fasteners over earlier generations is that
C-they can be installed with ordinary hand tools.
8386. To protect packing rings or seals from damage when it is necessary to install them over or inside threaded sections, the
C-threaded section should be covered with a suitable sleeve.
8044. The general rule for finding the proper rivet diameter is
C-three times the thickness of the thickest sheet.
8215. In rotorcraft external-loading, the ideal location of the cargo release is where the line of action passes
C-through the center of gravity at all times.
8217. A helicopter in forward flight, cruise configuration, changes direction by
C-tilting the main rotor disk in the desired direction.
8188. A resurfaced soldering iron cannot be used effectively until after the working face has been
C-tinned.
8267. After repairing or re-covering a rudder, the surface should be rebalanced
C-to manufacturer's specifications.
8221. Main rotor blades that do not cone by the same amount during rotation are said to be out of
C-track.
8948. When an airplane's primary flight control surfaces are set for a particular phase of flight, such as landing or takeoff, the corresponding control-surface indicating system will show
C-trim position.
8331. Aircraft brakes requiring a large volume of fluid to operate the brakes generally
C-use power brake control valves.
8358. The hydraulic packing seals used in a landing gear shock strut are
C-used only with a specific type of fluid.
8251. The correct dihedral angle can be determined by
C-using a dihedral board and bubble level along the front spar of each wing.
8219. In a hovering helicopter equipped with a tail rotor, directional control is maintained by
C-vary the pitch of the tail rotor blades.
8828. A voltage regulator controls generator output by
C-varying current flow to generator field coil.
8321. Overinflated aircraft tires may cause damage to the
C-wheel flange.
8250. Rigging and alignment checks should not be undertaken in the open; however, if this cannot be avoided, the aircraft should be positioned
C-with the nose into the wind.
9023. In some fire-extinguishing systems, evidence that the system has been intentionally discharged is indicated by the absence of a
C-yellow disk on the side of the fuselage.
8095. If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surface should be
C. covered with a thin coat of wax.