Block 9 AIM

How long should you wait after a flight before checking tire pressure? A— At least 2 hours (3 hours in hot weather). B— At least 3 hours (4 hours in hot weather). C—At least 4 hours (5 hours in hot weather).

A— At least 2 hours (3 hours in hot weather).

What mixture may be used as a deicing fluid to remove frost from an aircraft surface? A— Ethylene glycol and isopropyl alcohol. B— Methyl-ethyl-ketone and ethylene glycol. C—Naphtha and isopropyl alcohol

A— Ethylene glycol and isopropyl alcohol.

Where are the heating elements located on most aircraft with electrically heated windshields? A— Laminated in the glass. B— Attached to the glass. C—Inside the windshield frame.

A— Laminated in the glass.

What is the purpose of a compensating port or valve in a brake master cylinder of an independent brake system? A— Permits the fluid to flow toward or away from the reservoir as temperature changes. B— Assists in the master cylinder piston return. C—Prevents fluid from flowing back to the reservoir.

A— Permits the fluid to flow toward or away from the reservoir as temperature changes.

A close inspection of a fusible plug reveals the core has experienced some deformation. What is the appropriate maintenance procedure? A— Replace all the fusible plugs. B— Replace the affected fusible plugs. C—Replace with new wheel assembly.

A— Replace all the fusible plugs.

What method is usually employed to control the temperature of an anti-icing system using surface combustion heaters? A— Thermo-cycling switches. B— Thermostats in the cockpit. C—Heater fuel shutoff valves.

A— Thermo-cycling switches.

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. B— that are used in conjunction with an antiskid system. C—that are used on aircraft having high landing speeds.

A— that are designed to work with lower pressure.

The pressure source for power brakes is A— the main hydraulic system. B— the power brake reservoir. C—a master cylinder.

A— the main hydraulic system.

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. B— toe-in. C—negative camber.

A— toe-out.

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. B— the metering pin gradually reduces the size of the orifice as the shock strut extends. C—the air is forced through a restricted orifice in the reverse direction.

A— various types of valves or orifices are used which restrict the reverse fluid flow.

What are three methods of anti-icing aircraft windshields? 1. Blanket-type heating system. 2. An electric heating element in the windshield. 3. Heated air circulating system. 4. Hot water system. 5. Windshield wipers and anti-icing fluid. 6. Ribbon-type heating system. A—2, 3, 5. B—1, 2, 6. C—2, 3, 4.

A—2, 3, 5.

(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. B— 28.8. C— 22.

A—24.

What system component aids in the prevention of carburetor icing? A—Alcohol injection nozzle. B— Bleed air valve. C—Air diverter butterfly.

A—Alcohol injection nozzle.

What is the principle characteristic of a windshield pneumatic rain removal system? A— An air blast spreads a liquid rain repellant evenly over the windshield that prevents raindrops from clinging to the glass surface. B— An air blast forms a barrier that prevents raindrops from striking the windshield surface. C— A pneumatic rain removal system is simply a mechanical windshield wiper system that is powered by pneumatic system pressure.

B— An air blast forms a barrier that prevents raindrops from striking the windshield surface.

pilot reports the right brake on an aircraft is spongy when the brake pedal is depressed in a normal manner. The probable cause is A— the hydraulic master cylinder piston is sticking. B— air in the brake hydraulic system. C—the hydraulic master cylinder piston return spring is weak.

B— air in the brake hydraulic system.

Aircraft tire pressure should be checked A— using only a push on stick-type gauge having 1-pound increments. B— at least once a week or more often. C—as soon as possible after each flight.

B— at least once a week or more often.

In brake service work, the term "bleeding brakes" is the process of A— withdrawing air only from the system. B— withdrawing fluid from the system for the purpose of removing air that has entered the system. C—replacing small amounts of fluid in reservoir.

B— withdrawing fluid from the system for the purpose of removing air that has entered the system.

A special bolt in a landing gear attachment requires a torque value of 440 inch-pounds. How many foot-pounds are required? A— 36.8. B— 38. C— 36.6.

C— 36.6.

Excessive wear in the center of the tread of an aircraft tire is an indication of A— misalignment. B— underinflation. C— overinflation.

C— overinflation.

Excessive wear in the shoulder area of an aircraft tire is an indication of A— overinflation. B— excessive toe-in. C— underinflation.

C— underinflation.

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. A—1, 2, 4, 5. B—2, 3, 4, 5. C—1, 2, 3, 5.

C—1, 2, 3, 5

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. A—2, 3, 4, 5, 6, 7, 8. B—1, 2, 3, 5, 7, 8. C—2, 3, 4, 6, 7, 8.

C—2, 3, 4, 6, 7, 8.

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? A— A bypass valve. B— An orifice check valve. C—A shuttle valve.

C—A shuttle valve.

On an air valve core stem, what indicates high-pressure type? A— An embossed letter "NP". B— An embossed letter "HP". C—An embossed letter "H".

C—An embossed letter "H".

What icing condition may occur when there is no visible moisture present? A— Injector ice. B— Inlet ice. C—Carburetor ice.

C—Carburetor ice.

If it is determined that spongy brake action is not caused by air in the brake system, what is the next most likely cause? A— Worn brake lining. B— Internal leakage in the master cylinder. C—Deteriorated flexible hoses.

C—Deteriorated flexible hoses.

What controls the inflation sequence in a pneumatic deicer boot system? A— Shuttle valve. B— Vacuum pump. C—Distributor valve.

C—Distributor valve.

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? A— Vacuum relief valve. B— Ejector. C—Distributor valve.

C—Distributor valve.

Many brake types can be adapted to operate mechanically or hydraulically. Which type is not adapt- able to mechanical operation? A— Single-disk spot type. B— Single-servo type. C—Expander-tube type.

C—Expander-tube type.

What should be checked when a shock strut bottoms during a landing? A— Air pressure. B— Packing seals for correct installation. C—Fluid level.

C—Fluid level.

What should be used to melt the ice in a turbine engine if the compressor is immobile because of ice? A— Deicing fluid. B— Anti-icing fluid. C—Hot air.

C—Hot air.

What is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut? A— Limit compression stroke. B— Hold the strut in place. C—Maintain correct wheel alignment.

C—Maintain correct wheel alignment.

What device in a hydraulic system with a constant- delivery pump allows circulation of the fluid when no demands are on the system? A— Pressure relief valve. B— Shuttle valve. C—Pressure regulator.

C—Pressure regulator.

What may be used to clean deicer boots? A— Unleaded gasoline or Jet A fuel. B— Naphtha. C—Soap and water.

C—Soap and water.

Which of the following regulates the vacuum of the air pump to hold the deicing boots deflated when the pneumatic deicing system is off? A— Distributor valve. B— Pressure regulator. C—Suction relief valve.

C—Suction relief valve.

Extension of an oleo shock strut is measured to determine the A— amount of oil in the strut. B— physical condition of the strut itself. C—proper operating position of the strut.

C—proper operating position of the strut.

When servicing an empty shock strut with fluid, the strut should be completely compressed and extended several times to ensure A— the piston rod and wiper are lubricated with hydraulic fluid. B— all excess hydraulic fluid is forced out of the strut. C—proper packing ring seating and removal of air bubbles.

C—proper packing ring seating and removal of air bubbles.

Debooster valves are used in brake systems primarily to A— ensure rapid application and release of the brakes. B— reduce brake pressure and maintain static pressure. C—reduce the pressure and release the brakes rapidly

C—reduce the pressure and release the brakes rapidly

Debooster cylinders are used in brake systems primarily to A— reduce brake pressure and maintain static pressure. B— relieve excessive fluid and ensure a positive release. C—reduce the pressure to the brake and increase the volume of fluid flow.

C—reduce the pressure to the brake and increase the volume of fluid flow.

On most aircraft, the oil level of an air and oil shock strut is checked by A— removing the oil filler plug and inserting a gauge. B— measuring the length of the strut extension with a certain air pressure in the strut. C—releasing the air and seeing that the oil is to the level of the filler plug.

C—releasing the air and seeing that the oil is to the level of the filler plug.

An electric motor used to raise and lower a landing gear would most likely be a A— shunt field series-wound motor. B— split field shunt-wound motor. C—split field series-wound motor.

C—split field series-wound motor.

If a shock strut bottoms after it has been properly serviced, the A— strut should be disassembled and the metering pin orifice plate replaced. B— air pressure should be increased. C—strut should be removed, disassembled, and inspected.

C—strut should be removed, disassembled, and inspected.

When installing a chevron-type seal in an aircraft hydraulic cylinder, the open side of the seal should face A— opposite the direction of fluid pressure. B— up or forward when the unit is installed in a horizontal position. C—the direction of fluid pressure.

C—the direction of fluid pressure.

Internal leakage in a brake master cylinder unit can cause A— fading brakes. B— slow release of brakes. C—the pedal to slowly creep down while pedal pressure is applied.

C—the pedal to slowly creep down while pedal pressure is applied.

Aircraft brakes requiring a large volume of fluid to operate the brakes generally A— use independent master cylinder systems. B— do not use brake system accumulators. C—use power brake control valves.

C—use power brake control valves.

The hydraulic packing seals used in a landing gear shock strut are A— generally designed to be compatible with more than one type of fluid. B— kept from direct contact with fluid by teflon or nylon backup rings. C—used only with a specific type of fluid.

C—used only with a specific type of fluid.

Overinflated aircraft tires may cause damage to the A— brake linings. B— wheel hub. C—wheel flange.

C—wheel flange.

What is the minimum amount of time to wait for tires to cool before checking tire pressure? A— 3 hours. B— 2 hours. C—1 hour.

A— 3 hours.

Which of the following is the best means to use when removing wet snow from an aircraft? A— A brush or a squeegee. B— Hot air. C—Warm water.

A— A brush or a squeegee.

Why are the tubes in deicer boots alternately inflated? A— Alternate inflation of deicer boot tubes keeps disturbance of the airflow to a minimum. B—Alternate inflation of deicer boot tubes does not disturb airflow. C—Alternate inflation of deicer boot tubes relieves the load on the air pump.

A— Alternate inflation of deicer boot tubes keeps disturbance of the airflow to a minimum.

What is one check for proper operation of a pitot/ static tube heater after replacement? A— Ammeter reading. B— Voltmeter reading. C—Continuity check of system.

A— Ammeter reading.

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. B— Insufficient hydraulic fluid in the reservoir. C—Glazed brake linings.

A— An internal leak in the master cylinder.

Why do most aircraft tire manufacturers recommend that the tubes in newly installed tires be first inflated, fully deflated, and then reinstalled to the correct pressure? A— To allow the tube to position itself correctly inside the tire. B— To eliminate all the air between the tube and the inside of the tire. C—To test the entire assembly for leaks.

A— To allow the tube to position itself correctly inside the tire.

What is the purpose of the oil separator in the pneumatic deicing system? A— To protect the deicer boots from oil deterioration. B— To remove oil from air exhausted from the deicer boots. C—To prevent an accumulation of oil in the vacuum system.

A— To protect the deicer boots from oil deterioration.

What is the source of pressure for inflating deicer boots on reciprocating engine aircraft? A— Vane-type pump. B— Gear-type pump. C—Piston-type pump.

A— Vane-type pump.

When will a continuous horn provide a warning in the cockpit? A— When the throttle is retarded and gear is not down and locked. B— When the throttle is advanced and gear is down and locked. C—When the throttle is retarded and gear is down and locked.

A— When the throttle is retarded and gear is not down and locked.

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. B— one or more white dots. C—a white and yellow stripe.

A— a blue stripe or dot.

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. B— cannot allow full debooster piston travel without fluid from the high pressure side entering the low pressure chamber. C—must be bled separately after brake bleeding has been completed.

A— allow full debooster piston travel without fluid from the high pressure side entering the low pressure chamber.

When servicing an air/oil shock strut with MIL-5606 the strut should be A— collapsed and fluid added at the filler opening. B— fully extended and fluid added at the filler opening. C—partially extended and fluid added at the filler opening.

A— collapsed and fluid added at the filler opening.

The left brake is dragging excessively on an air- plane 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. B— excessively worn brake linings. C—low fluid supply in the brake system reservoir.

A— foreign particles stuck in the master cylinder compensating port.

Power boost brake systems are used on aircraft that have A— high landing speeds. B— low normal hydraulic system pressure. C—more than one brake assembly per axle.

A— high landing speeds.

A flexible hydraulic hose identified as MIL-H-8788 will have a strip running the length of the hose. This stripe is A— installed without excessive twisting. B— for high pressure fluids with a flexing range. C—suitable for a wide temperature range.

A— installed without excessive twisting.

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. B— low air charge. C—a restricted metering pin orifice.

A— low fluid.

The primary purpose for balancing aircraft wheel assemblies is to A— prevent heavy spots and reduce vibration. B— distribute the aircraft weight properly. C—reduce excessive wear and turbulence.

A— prevent heavy spots and reduce vibration.

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. B— clean the surface with MEK and apply adhesive to the back of the deicer boot and leading edge of the wing. C—rough the surface with a mild abrasive.

A— remove all paint from the area to be covered by the deicer boot.

A stripe or mark applied to a wheel rim and extend- ing onto the sidewall of a tube-type tire is a A— slippage mark. B— wheel-to-tire balance mark. C—wheel weight reference mark.

A— slippage mark.

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 both sides of the rotating disk assured? A— By allowing the brake rotor to float to automatically equalize as pressure is applied to the rotor. B— By allowing the caliper to float to automatically equalize as pressure is applied to the rotor. C—By allowing the brake linings to automatically equalize as pressure is applied to the rotor.

B— By allowing the caliper to float to automatically equalize as pressure is applied to the rotor.

How do deicer boots help remove ice accumulations? A— By preventing the formation of ice. B— By breaking up ice formations. C—By allowing only a thin layer of ice to build up.

B— By breaking up ice formations.

How is it determined in a master cylinder brake system that all of the air has been purged from the system? A— By operating a hydraulic unit and watching the system pressure gauge for smooth, full scale deflection. B— By depressing the brake and noting that the brake is firm and not spongy. C—By measuring the amount of fluid return to the master cylinder upon brake release.

B— By depressing the brake and noting that the brake is firm and not spongy.

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? A— Replace both tires. B— Correct the discrepancy and enter in the aircraft records. C—Replace the tire with the lowest pressure.

B— Correct the discrepancy and enter in the aircraft records.

Which statement is true with respect to an aircraft equipped with hydraulically operated multiple-disk type brake assemblies? A— There are no minimum or maximum disk clearance checks required due to the use of self- compensating cylinder assemblies. B— Do not set parking brake when brakes are hot. C—No parking brake provisions are possible for this type of brake assembly.

B— Do not set parking brake when brakes are hot.

Which of the following indications occur during a normal operational check of a pneumatic deicer system? A— Relatively steady readings on the pressure gauge and fluctuating readings on the vacuum gauge. B— Fluctuating readings on the pressure gauge and relatively steady readings on the vacuum gauge. C—Pressure and vacuum gauges will fluctuate as the deicer boots inflate and deflate.

B— Fluctuating readings on the pressure gauge and relatively steady readings on the vacuum gauge.

What condition would most likely cause excessive fluctuation of the pressure gauge when the hydraulic pump is operating? A— Accumulator air pressure low. B— Inadequate supply of fluid. C—System relief valve sticking closed.

B— Inadequate supply of fluid.

Why should a chemical rain repellant not be used on a dry windshield? A— It will etch the glass. B— It will restrict visibility. C—It will cause glass crazing.

B— It will restrict visibility.

What is the function of a cam incorporated in a nose gear shock strut? A— Provides an internal shimmy damper. B— Straightens the nose wheel. C—Provides steering of aircraft during ground operation.

B— Straightens the nose wheel.

What is used as a temperature-sensing element in an electrically heated windshield? A— Thermocouple. B— Thermistor. C— Thermometer.

B— Thermistor.

What maintains normal windshield temperature control in an electrically heated windshield system? A— Thermal overheat switches. B— Thermistors. C—Manually-controlled rheostat.

B— Thermistors.

When working with high pressure, high performance tires, why is it recommended to deflate the tires when removing wheels from the axle? A— To relieve the strain on the wheel retaining nut and axle threads. B— To ensure safety in case of a defective wheel or broken tie bolts. C—To reduce the size of the tire for ease of removal.

B— To ensure safety in case of a defective wheel or broken tie bolts.

What is the purpose of the distributor valve in a deicing system utilizing deicer boots? A— To equalize the air pressure to the left and right wings. B— To sequence the deicer boots inflations symmetrically. C—To distribute anti-icing fluid to the deicer boots.

B— To sequence the deicer boots inflations symmetrically.

A fully-charged hydraulic accumulator provides A— air pressure to the various hydraulic components. B— a source for additional hydraulic power when heavy demands are placed on the system. C—positive fluid flow to the pump inlet.

B— a source for additional hydraulic power when heavy demands are placed on the system.

If a brake debooster is used in a hydraulic brake system, its position in the system will be A— between the pressure manifold of the main hydraulic system and the power brake control valve. B— between the brake control valve and the brake actuating cylinder. C—in the brake pressure line between the brake pedal and the brake accumulator.

B— between the brake control valve and the brake actuating cylinder.

Two possible sources of heat for the operation of a wing thermal anti-icing system are A— first stage of the air cycle turbine and turbo compressor. B— compressor bleed air and aircraft electrical system. C—combustion heater and exhaust gases.

B— compressor bleed air and aircraft electrical system.

On all aircraft equipped with retractable landing gear, some means must be provided to A— retract and extend the landing gear if the normal operating mechanism fails. B— extend the landing gear if the normal operating mechanism fails. C—prevent the throttle from being reduced below a safe power setting while the landing gear is retracted.

B— extend the landing gear if the normal operating mechanism fails.

A hydraulic system referred to as a "power pack" system will A— have an engine-driven pump for greater pressure. B— have all hydraulic power components located in one unit. C—have a pressurized reservoir.

B— have all hydraulic power components located in one unit.

An automatic damping action occurs at the steering damper if for any reason the flow of high-pressure fluid is removed from the A— outlet of the steering damper. B— inlet of the steering damper. C—replenishing check valve.

B— inlet of the steering damper.

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 A— shimming the axle in the oleo trunnion. B— inserting, removing, or changing the location of washers or spacers at the center pivotal point of the scissor torque links. C—placing shims or spacers behind the bearing of the out-of-tolerance wheel or wheels.

B— inserting, removing, or changing the location of washers or spacers at the center pivotal point of the scissor torque links.

A pilot reports that the brake pedals have excessive travel. A probable cause is A— weak return springs. B— lack of fluid in the brake system. C—oil or some foreign matter on the brake rotors and linings.

B— lack of fluid in the brake system.

A sleeve, spacer, or bumper ring is incorporated in a landing gear oleo shock strut to A— limit the extension of the torque arm. B— limit the extension stroke. C—reduce the rebound effect.

B— limit the extension stroke.

In shock struts, chevron seals are used to A— absorb bottoming effect. B— prevent oil from escaping. C—serve as a bearing surface.

B— prevent oil from escaping.

The purpose of an orifice check valve is to A— relieve pressure to a sensitive component. B— restrict flow in one direction and allow free flow in the other. C—relieve pressure in one direction and prevent flow in the other direction.

B— restrict flow in one direction and allow free flow in the other.

The metering pins in oleo shock struts serve to A— lock the struts in the DOWN position. B— retard the flow of oil as the struts are compressed. C—meter the proper amount of air in the struts.

B— retard the flow of oil as the struts are compressed.

The best safeguards against heat buildup in aircraft tires are A— proper tire inflation, minimum braking, and ground rolls into the wind. B— short ground rolls, slow taxi speeds, minimum braking, and proper tire inflation. C—minimum braking, proper tire inflation, and long ground rolls.

B— short ground rolls, slow taxi speeds, minimum braking, and proper tire inflation.

The correct inflation pressure for an aircraft tire can be obtained from A— tire manufacturer's specifications. B— the aircraft service manual. C—the information stamped on the aircraft wheel.

B— the aircraft service manual.

When an air/oil type of landing gear shock strut is used, the initial shock of landing is cushioned by A— compression of the air charge. B— the fluid being forced through a metered opening. C—compression of the fluid.

B— the fluid being forced through a metered opening.

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 A— the master cylinder one-way cup is leaking. B— worn brake linings. C—worn brake disk causing excessive clearance between the notches on the perimeter of the disk and the splines or keys on the wheel.

B— worn brake linings.

What action should be taken whenever maintenance is performed that will affect the landing gear system performance? A— A test flight should be performed to conduct an operational check. B— A technician with an inspection authorization should perform a visual inspection. C—The aircraft should be placed on jacks and a retraction test should be performed.

C—The aircraft should be placed on jacks and a retraction test should be performed.

What would be the effect if the piston return spring broke in a brake master cylinder? A— The brakes would become spongy. B— The brake travel would become excessive. C—The brakes would drag.

C—The brakes would drag.

What is one effect a restricted compensator port of a master cylinder will have on a brake system? A— The brakes will operate normally. B— The reservoir will be filled by reverse flow. C—The restriction will cause slow release of the brakes.

C—The restriction will cause slow release of the brakes.

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? A— Continuously while the aircraft is in flight. B— In symmetric cycles during icing conditions to remove ice as it accumulates. C—Whenever icing conditions are first encountered or expected to occur.

C—Whenever icing conditions are first encountered or expected to occur.

A high-speed aircraft tire with a sound cord body and bead may be recapped A— a maximum of three times. B— only by the tire manufacturer. C—an indefinite number of times.

C—an indefinite number of times.

Nose gear centering cams are used in many retractable landing gear systems. The primary purpose of the centering device is to A— align the nosewheel prior to touchdown. B— engage the nosewheel steering. C—center the nosewheel before it enters the wheel well.

C—center the nosewheel before it enters the wheel well.

The purpose of a relief valve in a brake system is to A— reduce pressure for brake application. B— prevent the tire from skidding. C—compensate for thermal expansion.

C—compensate for thermal expansion.

Arcing in an electrically heated windshield panel usually indicates a breakdown in the A— temperature-sensing elements. B— autotransformers. C—conductive coating.

C—conductive coating.

Chines are used on some aircraft nose wheel tires to help A— nose gear extension at higher air speeds. B— reduce the possibility of hydroplaning. C—deflect water away from the fuselage.

C—deflect water away from the fuselage.

The purpose of a sequence valve in a hydraulic retractable landing gear system is to A— prevent heavy landing gear from falling too rapidly upon extension. B— provide a means of disconnecting the normal source of hydraulic power and connecting the emergency source of power. C—ensure operation of the landing gear and gear doors in the proper order.

C—ensure operation of the landing gear and gear doors in the proper order.

When bleeding aircraft brakes, one of the indications that the air has been purged from the system is A— partial brake pedal travel. B— full brake pedal travel. C—firm brake pedals.

C—firm brake pedals.

Instructions concerning the type of fluid and amount of air pressure to be put in a shock strut are found A— on the airplane data plate. B— in the aircraft operations limitations. C—in the aircraft manufacturer's service manual.

C—in the aircraft manufacturer's service manual.

The fusible plugs installed in some aircraft wheels will A— indicate tire tread separation. B— prevent overinflation. C—melt at a specified elevated temperature.

C—melt at a specified elevated temperature.

A filter incorporating specially treated cellulose paper is identified as a A— sediment trap. B— cuno filter. C—micronic filter.

C—micronic filter.

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 A— a violation of the Federal Aviation Regulations. B— a minor repair. C—preventive maintenance.

C—preventive maintenance.