Powerplant

8782: As manifold pressure increases in a reciprocating engine, the

density of air in the cylinder decreases

A full-authority electronic engine control (EEC) is a system that receives all the necessary data for engine operation and

develops the commands to various actuators to control engine parameters.

8532: The purpose of staggered ignition is to compensate for

diluted fuel/air mixture around exhaust valve

8950: The purpose of a three-way propeller valve is to

direct oil from the engine oil system to the propeller cylinder

The purpose of the flow control valve in a reciprocating engine oil system is to

direct oil through or around the oil cooler.

8989: When preparing a propeller blade for inspection it should be cleaned with

mild soap and water

The recommended aircraft engine lubricants are

mineral or synthetic based.

The device that controls the ratio of the fuel/air mixture to the cylinders is called a

mixture control.

8803: If carburetor or induction system icing is not present when carburetors heat is applied with no change in the trottle setting, the

mixture will become richer

8841: Which statement is true regarding the air passing through the combustion section of a jet engine

most is used for engine cooling

If, during inspection at engine overhaul, ball or roller bearings are found to have magnetism but otherwise have not defects, they

must be degaussed before use.

In a dual axial-flow compressor, the first stage turbine drives

n(2) compressor.

The device that controls the volume of the fuel/air mixture to the cylinders is called a

throttle valve

8566: In a high-tension ignition system, a primary capacitor of too low a capacity

the breaker contacts burn

The diffuser section of a jet engine is located between

the compressor section and the burner section.

A certain direct current series motor mounted within an aircraft draws more amperes during start than when it is running under its rated load. The most logical conclusion that my be drawn is

the condition is normal for this type of motor.

A high surge of current is required when a DC electric motor is first started. As the speed of the motor increases,

the counter EMF builds up and opposed the applied EMF, thus reducing the current flow through the armature.

8873: Thrust reversers utilizing a pneumatic actuating system usually receive operating pressure from

the engine bleed air system

8926: The low pitch stop on a constant-speed propeller is usually set so that

the engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure

8872: Most exhaust system failures result from thermal fatigue cracking in the areas of stress concentration. This condition is usually caused by

the high temperatures at which the exhaust system operates

8559: Generally, when removing a turbine engine igniter plug, in order to eliminate the possibility of the technician receiving a lethal shock, the ignition switch is turned off and

the igniter lead is disconnected from the plug and the center electrode grounded to the engine after disconnecting the transformer-exciter input lead and waiting the prescribed time

When a 28v, 75 amp generator is installed on an aircraft, an electrical load analysis ground check is performed and it is determined that the battery is furnishing 57 amps to the system, with all electrical equipment operating. This indicates

the load will be within the generator load limit.

8524: When internally timing a magneto, the breaker points begin to open when

the magneto poles are a few degrees beyond the neutral position

8942: What controls the constant-speed range of a constant-speed propeller

the mechanical limits in the propeller pitch range

What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?

the oil becomes contaminated with moisture, acids, and finely divided suspended solid particles.

The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits

the oil tank to be vented through the normal engine vent.

8626: A clicking sound can be heard at engine coast-down in a pneumatic starter incorporating a sprag clutch ratchet assembly is an indication of

the pawls recontacting and riding on the ratchet gear

8921: The pitch-changing mechanism of the hydromatic propeller is lubricated by

the pitch-changing oil

8918: The propeller blade angle is defined as the acute angle between the airfoil section chord line (at the blade reference station) and which of the following

the plane of rotation

8977: Propeller blade tracking is the process of determining

the positions of the propeller blades relative to each other

8743: The primary condition(s) that allow(s) microorganisms to grow in the fuel in aircraft fuel tanks is (are)

the pressence of water

8570: When the ignition switch of a single (reciprocating) engine aircraft is turned to the OFF position

the primary circuits of both magnetos are grounded

8982: If a flanged propeller shaft has dowel pins

the propeller can be installed in a given position

8973: If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is

the propeller retaining nut was not tight enough during previous operation

What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?

the return oil will be pumped overboard.

Jet engine turbine blades removed for detailed inspection must be reinstalled in

the same slot.

The engine oil temperature regulator is usually located between which of the following on a dry sump reciprocating engine?

the scavenger pump outlet and the oil storage tank.

What determines the minimum particle size which will be excluded or filtered by a cuno-type filter?

the spacer thickness.

Upon what does the output frequency of an ac generator depend?

the speed of rotation and the number of field poles.

8633: In the event a pneumatic start valve will not operate and the manual override must be used, the starter T-handle must be closed at scheduled starter drop out because

the starter will overspeed at a given N2

8553: Capacitance afterfiring of a spark plug is caused by

the stored energy in the ignition shielded lead unloading after normal timed ignition

Which of the following is regulated in a generator to control its voltage output?

the strength of the field

If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?

the thinnest oil that will stay in place and maintain a reasonable film strength.

The abbreviation Pt7 used in turbine engine terminology means

the total pressure at station no.7

8858: Select a characteristic of a good weld on exhaust stacks

the weld should taper off smoothly into the base metal

Float-type carburetors which are equipped with economizers are normally set for

their leanest practical mixture delivery at cruising speeds and enriched by means of the economizer system at higher power settings.

8835: Cylinder head temperatures are measured by means of an indicator and a

thermocouple sensing device

How many basic types of circuit breakers are used in powerplant installation electrical systems?

three

What are two types of ac motors that are used to produce a relatively high torque?

three-phase induction and capacitor start.

What is meant by a shrouded turbine?

The turbine blades are shapes so that their ends form a band or shroud.

An excessively lean fuel/air mixture may cause

an increase in cylinder head temperature.

8988: After proper removal of aluminum blade damage, the affected surface should be polished with

very fine sandpaper

What is used to polish commutators or slip rings?

very fine sandpaper.

17 (8326) - The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events?

B- Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire-extinguishing system.

12 (8321) - What is the principle of operation of the continuous-loop fire detector system sensor?

B- Core resistance material which prevents current flow at normal temperatures.

53 (8053) - What is required by 14 CFR Part 43 Appendix D when performing an annual/100-hour inspection on a reciprocating engine aircraft?

B- Cylinder compression check.

107 (8107) - One cause of afterfiring in an aircraft engine is

C- an excessively rich mixture.

8776: What part of an aircraft in flight will begin to accumulate ice before any other?

Carburetor

(1)Accumulation of contaminates in the compressor of a turbojet engine reduces aerodynamic efficiency of the blades. (2)Two common methods for removing dirt deposits form turbojet engine compressor blades are a fluid wash and an abrasive grit blast. Regarding the above statements,

Both no.1 and no.2 are true.

Oil tank fillers on reciprocating engines are marked with the word

"oil" in accordance with 14 CFR part 43.

According to FAR, oil tank fillers on turbine engines must be marked with the word

'oil'

Which statements are true regarding aircraft engine propulsion?

(1)An engine driven propeller imparts a relatively small amount of acceleration to a large mass of air. (2) Turbojet and turbofan engines impart a relatively large amount of acceleration to a smaller mass of air.

Which of the following can cause fan blade shingling in a turbofan engine?

(1)Engine overspeed (4) FOD.

Which of the following variables affect the inlet air density of a turbine engine?

(1)Speed of the aircraft (4)Altitude of the aircraft (5)Ambient temperature.

Which of the following factors affect the thermal efficiency of a turbine engine?

(1)Turbine inlet temperature (2)Compression ratio (5)Turbine and compressor efficiency.

During inspection, turbine engine components exposed to high temperatures may only be marked with such materials as allowed by the manufacturer. These materials generally include

(1)layout dye (2)commercial felt tip marker (4)chalk.

Which of the following may be used to accomplish internal inspection of an assembled turbine engine?

(3) A borescope.

Turbine engine components exposed to high temperatures generally may not be marked with

(3)wax or grease pencil (5)graphite lead pencil

Determine which portion of the AD is applicable for Model o-690 series engine, serial No. 5863-40 with 283 hours' time in service.

(B) For Model o-690 series engines, serial Nos. 5265-10 through 6219-40 and I0- 690 series engine, serial Nos. 424-48 through 551-48, compliance with (1) Within 25 hours' time in service after the effective date of this AD and every 100 hours' time in service thereafter for engines with more than 275 hours' time in service on the effective date of this AD.

8621: (Refer to Figure 5) Which malfunctions will allow the igniters to operate when tested but be inoperative during a start attempt? (1) Conductor No. 10 broken (2) Conductor No. 11 broken (3) Ignition relay inoperative (4) Conductor No. 12 broken

1 or 3

8622: (Refer to Figure 5) Which malfunctions will allow the igniters to operate normally during start but be inoperative when tested? (1) conductor No. 14 broken (2) conductor No. 10 broken (3) Conductor No. 15 broken (4) Conductor No. 12 broken

1 or 3

A mixture ratio of 11:1 normally refers to

1 part fuel and 11 parts air.

8801: What indications may shift when a turbofan engine anti-icing (bleedair) system is turned on? 1)Tachometer 2)EGT 3) EPR

1, 2 and 3

8600: Which of the following are advantages of dual ignition in aircraft engines? (1) Gives a more complete and quick combustion of the fuel. (2) Provides backup magneto system. (3) Increases the power output of the engine. (4) Permits the use of lower grade fuels. (5) Increases burn intensity of the spark at the spark plugs

1, 2, 3

8602: Which of the following are distinct circuits of a high-tension magneto? (1) Magnetic (2) Primary (3) E-gap (4) P-Lead (5) Secondary

1, 2, 5

8874: Operating thrust reversers at low ground speeds can sometimes cause

1, 2, and 3

8847: Reciprocating engine exhaust system designs commonly used to provide for ease of installation and/or allow for expansion and contraction, may include the use of

1, 2, and/or 3

8607: Which of the following are included in a typical turbine engine ignition system? (1) two igniter plugs (2) two transformers (3) one exciter unit (4) two intermediate ignition leads (5) two low tension igniter leads (6) two high tension igniter leads

1, 3, 6

8792: What are the three basic regulating components of a sea-level boosted turbocharger system? 1) Exhaust bypass assembly 2) Compressor assembly 3) Pump and bearing casing 4) Density controller 5) Differential pressure controller

1, 4, 5

In addition to lubricating engine oil performs what functions?

1-5

The density of air is very important when mixing fuel and air to obtain a correct fuel-to-air ratio. Which of the following weighs the most?

100 parts dry air.

What is the ampere-hour rating of a storage battery that is designed to deliver 45 amperes for 2.5 hours

112.5 ampere-hour

8771: Maximum power is normally considered to be developed in a reciprocating engine with a fuel/air mixture ratio of approximately

12:1

Which of the following contains a minimum checklist for 100-hour inspections of engines?

14 CFR Part 43 Appendix D.

Which of the following Federal Aviation Regulations require that all aircraft using fuses as the circuit protective devices carry 'one spar set of fuses, or three spare fuses of each kind required'?

14 CFR Part 91

Which Federal Aviation Regulation requirement prevents the use of automatic reset circuit breakers?

14CFR Part 23

Which Federal Aviation Regulation specifies that each resettable circuit protective device requires a manual operation to restore service after the device has interrupted the circuit?

14CFR Part 23

8749: The Federal Aviation Regulations require the fuel flow rate for gravity systems (main and reserve) to be

150 percent of the tackoff fuel consumption of the engine

8516: What is the radial location of the two north poles of a four-pole rotating magnet in a high-tension magneto?

180° apart

8603: What are two parts of a distributor in an aircraft engine ignition system? (1) Coil (2) Block (3) Stator (4) Rotor (5) Transformer

2 and 4

An oil tank having a capacity of 5 gallons must have an expansion space of

2 quarts.

The maximum allowable voltage drop between the generator and the bus bar is

2% of the regulated voltage.

8877: Turboject and turbofan thrust reverser systems are generally powered by

2, 3, and 4

Standard sea level pressure is

29.92" Hg.

8787: Boost manifold pressure is generally considered to be any manifold pressure above

30 inches Hg

In a 28v system, what is the maximum continuous that can be carried by a single No.10 copper wire 25 ft long, routed in free ari?

35 amps

8854: On turbojet powered airplanes, thrust reversers are capable of producing between

35 and 50 percent of the rated thrust in the reverse direction

8527: How many secondary coils are required in a low-tension ignition system on an 18-cylinder engine?

36

8614: (Refer to Figure 5) With power applied to the bus bar, what wire supplies standby power to the starter relay contact?

4

What is the frequency of most aircraft alternating current?

400 Hertz

Using standard atmospheric conditions, the standard sea level temperature is

59F

What speed must an eight pol ac generator turn to produce 400 Hertz ac?

6,000 RPM

Hwo many hour will a 140 ampere-hour battery deliver 15 amps?

9.33 hrs

8580: Which of the following statements most accurately describes spark plug heat range?

A cold plug is designed so that the insulator tip is reasonably short to hasten the rate of heat transfer from the tip through the spark plug shell to the cylinder head

What is meant by a double entry centrifugal compressor?

A compressor with vanes on both sides of the impeller.

8538: What test instrument could be used to test an ignition harness for suspected leakage?

A high tension lead tester

8548: How does the ignition system of a gas turbine engine differ from that of a reciprocating engine?

A high-energy spark is required for ignition

8537: What is the difference between a low-tension and a high-tension engine ignition system?

A low-tension system uses a transformer coil near the spark plugs to boost voltage, while the high-tension system voltage is constant from the magneto to the spark plugs.

8745: The fuel systems of aircraft certificated in the standard classification must include which of the following?

A positive means of shutting off the fuel to all engines

What is the profile of a turbine engine compressor blade?

A reduced blade tip thickness.

43 (8043) - If the crankshaft runout readings on the dial indicator are plus .002 inch and minus .003 inch, the runout is

A- .005 inch.

34 (8290) - A Bourdon-tube instrument may be used to indicate1. pressure.2. temperature.3. position.4. quantity.

A- 1 and 2.

80 (8080) - By use of a differential pressure compression tester, it is determined that the No. 3 cylinder of a nine-cylinder radial engine will not hold pressure after the crankshaft has been rotated 260° from top dead center compression stroke No. 1 cylinder. How can this indication usually be interpreted?

A- A normal indication.

81 (8081) - When does valve overlap occur in the operation of an aircraft reciprocating engine?

A- At the end of the exhaust stroke and the beginning of the intake stroke.

6 (8315) - What retains the nitrogen charge and fire-extinguishing agent in a high rate of discharge (HRD) container?

A- Breakable disk and fusible disk.

5 (8314) - How does carbon dioxide (CO(2)) extinguish an aircraft engine fire?

A- Contact with the air converts the liquid into snow and gas which smothers the flame.

105 (8105) - To what altitude will a turbo charged engine maintain sea level pressure?

A- Critical altitude.

88 (8088) - Increased water vapor (higher relative humidity) in the incoming air to a reciprocating engine will normally result in which of the following?

A- Decreased engine power at a constant RPM and manifold pressure.

21 (8021) - An aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance in its valve-operating mechanism after the minimum inlet oil and cylinder head temperatures for takeoff have been reached. When can this condition be expected?

A- During normal operation.

4 (8313) - How are most aircraft turbine engine fire-extinguishing systems activated?

A- Electrically discharged cartridges.

19 (8328) - The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the

A- Fenwal system.

1 (8257) - Which unit most accurately indicates fuel consumption of a reciprocating engine?

A- Fuel flowmeter.

39 (8295) - In regard to using a turbine engine oil analysis program, which of the following is NOT true?

A- Generally, an accurate trend forecast may be made after an engine's first oil sample analysis.

79 (8079) - What is the best indication of worn valve guides?

A- High oil consumption.

52 (8052) - Which of the following would indicate a general weak-engine condition when operated with a fixed-pitch propeller or test club?

A- Lower than normal static RPM, full throttle operation.

84 (8084) - What is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up?

A- Oil starvation of bearings and other parts.

48 (8304) - In what units are turbine engine tachometers calibrated?

A- Percent of engine RPM.

16 (8016) - Master rod bearings are generally what type?

A- Plain.

103 (8103) - What could cause excessive pressure buildup in the crankcase of a reciprocating engine?

A- Plugged crankcase breather.

50 (8050) - Which of the following will be caused by excessive valve clearance of a cylinder on a reciprocating aircraft engine?

A- Reduced valve overlap period.

11 (8320) - Which of the following is NOT used to detect fires in reciprocating engine nacelles?

A- Smoke detectors.

19 (8275) - Which of the following is a primary engine instrument?

A- Tachometer.

26 (8026) - Which statement is correct regarding a four-stroke cycle aircraft engine?

A- The intake valve closes on the compression stroke.

97 (8097) - Which statement pertaining to fuel/air ratios is true?

A- The mixture ratio which gives the best power is richer than the mixture ratio which gives maximum economy.

41 (8041) - Why does the smoothness of operation of an engine increase with a greater number of cylinders?

A- The power impulses are spaced closer together.

28 (8337) - Which of the following fire detection systems uses heat in the normal testing of the system?

A- The thermocouple system and the Lindberg system.

29 (8285) - What unit in a tachometer system sends information to the indicator?

A- The three-phase ac generator.

62 (8062) - Which of the following is most likely to occur if an overhead valve engine is operated with inadequate valve clearances?

A- The valves will not seat positively during start and engine warmup.

16 (8325) - Which of the following fire detection systems measures temperature rise compared to a reference temperature?

A- Thermocouple.

14 (8323) - The explosive cartridge in the discharge valve of a fire-extinguisher container is

A- a life-dated unit.

5 (8261) - The fuel-flow indicator rotor and needle for a motor-impeller and turbine indicating system is driven by

A- an electrical signal.

98 (8098) - Backfiring through the carburetor generally results from the use of

A- an excessively lean mixture.

86 (8086) - Direct mechanical push-pull carburetor heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted

A- before the stop at the control lever is reached in both HOT and COLD positions.

26 (8282) - (1) Powerplant instrument range markings show whether the current state of powerplant operation is normal, acceptable for a limited time, or unauthorized.(2) Powerplant instrument range markings are based on installed engine operating limits which may not exceed (but are not necessarily equal to) those limits shown on the engine Type Certificate Data Sheet.Regarding the above statements,

A- both No. 1 and No. 2 are true.

13 (8322) - The most satisfactory extinguishing agent for a carburetor or intake fire is

A- carbon dioxide.

68 (8068) - An engine misses in both the right and left positions of the magneto switch. The quickest method for locating the trouble is to

A- check for one or more cold cylinders.

32 (8288) - Jet engine thermocouples are usually constructed of

A- chromel-alumel.

21 (8330) - A fuel or oil fire is defined as a

A- class B fire.

32 (8032) - Valve overlap is defined as the number of degrees of crankshaft travel

A- during which both valves are off their seats.

24 (8280) - A common type of electrically operated oil temperature gauge utilizes

A- either a wheatstone bridge or ratiometer circuit.

44 (8300) - The engine pressure ratio (EPR) indicator is a direct indication of

A- engine thrust being produced.

87 (8087) - Reduced air density at high altitude has a decided effect on carburetion, resulting in a reduction of engine power by

A- excessively enriching the fuel/air mixture.

9 (8265) - The fuel-flow indication data sent from motor driven impeller and turbine, and motorless type fuel flow transmitters is a measure of

A- fuel mass-flow.

8 (8008) - The operating temperature valve clearance of a radial engine as compared to cold valve clearance is

A- greater.

56 (8056) - Excessive valve clearance results in the valves opening

A- late and closing early.

71 (8071) - If an engine operates with a low oil pressure and a high oil temperature, the problem may be caused by a

A- leaking oil dilution valve.

60 (8060) - If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is

A- low oil supply.

101 (8101) - To reduce the power output of an engine equipped with a constant-speed propeller and operating near maximum BMEP, the

A- manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control.

57 (8057) - During routine inspection of a reciprocating engine, a deposit of small, bright, metallic particles which do not cling to the magnetic drain plug is discovered in the oil sump and on the surface of the oil filter. This condition

A- may be a result of abnormal plain type bearing wear and is cause for further investigation.

25 (8025) - Some cylinder barrels are hardened by

A- nitriding.

40 (8296) - On an aircraft turbine engine, operating at a constant power, the application of engine anti-icing will result in

A- noticeable shift in EPR.

52 (8308) - The EGT gauge used with reciprocating engines is primarily used to furnish temperature readings in order to

A- obtain the best mixture setting for fuel efficiency.

28 (8284) - (1) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates the thrust produced.(2) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates volumetric efficiency.Regarding the above statements,

A- only No. 1 is true.

20 (8276) - A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registering

A- prevailing atmospheric pressure.

18 (8018) - Cam-ground pistons are installed in some aircraft engines to

A- provide a better fit at operating temperatures.

20 (8020) - Some aircraft engine manufacturers equip their product with choked or taper-ground cylinders in order to

A- provide a straight cylinder bore at operating temperatures.

11 (8011) - The primary concern in establishing the firing order for an opposed engine is to

A- provide for balance and eliminate vibration to the greatest extent possible.

47 (8047) - When cleaning aluminum and magnesium engine parts, it is inadvisable to soak them in solutions containing soap because

A- some of the soap will become impregnated in the surface of the material and subsequently cause engine oil contamination and foaming.

4 (8260) - Motor driven impeller and turbine fuel flow transmitters are designed to transmit data

A- using aircraft electrical system power.

What is a basic advantage of using ac for electrical power for a large aircraft?

AC systems operate at higher voltage than dc systems and therefore use less current and can use smaller and lighter weight wiring.

Newton's Law of Motion, generally termed the "Law of Momentum" states:

Acceleration is produced when a force acts on a mass. The greater the mass, the greater the amount of force needed.

What component is used to ensure fuel delivery during periods of rapid engine acceleration?

Acceleration pump

8558: What should be used to clean grease or carbon tracks from capacitors or coils that are used in magnetos?

Acetone

Where do stress rupture cracks usually appear to turbine blades?

Across leading or trailing edge at a right angle to the edge length.

Which method is commonly used to adjust the level of a float in a float-type carburetor?

Add or remove shims under the needle-valve seat.

8509: What will be the results of increasing the gap of the breaker points in a magneto?

Advance the spark and decrease the intensity

8734: Where is the engine fuel shutoff valve usually located?

Aft of the firewall

Where is the throttle valve located on a float-type carburetor?

After the main discharge nozzle and venturi.

When inspecting an aircraft reciprocating engine what document is used to determine if the magnetos are installed?

Aircraft Engine Specifications or TCDS.

A Cessna 180 aircraft has a McCauley propeller Model No. 2A34C50/90A. The propeller is severely damages in a ground accident, and this model propeller is not available for replacement. Which of the following should be used to find an approved alternate replacement?

Aircraft Specifications/TCDS.

What section in the instructions for continued airworthiness is FAA approved?

Airworthiness limitations section.

8777: Carburetor icing may be eliminated by which of the following methods?

Alcohol spray and heated induction air

An aircraft engine continuous cylinder fuel injection system normally discharges fuel during which stroke(s)?

All (continuously).

At what engine speed does the main metering jet actually function as a metering jet in a float-type carburetor?

All RPM's above idle range.

Which of the following is NOT an input parameter for a turbine engine fuel control unit?

Ambient humidity.

Aircraft electrical wire size is measured according to the

American Wire Gauge sytem

What method is ordinarily used to make idle speed adjustments on a float-type carburetor?

An adjustable throttle stop of linkage.

Which of the following causes a single diaphragm accelerator pump to discharge fuel?

An increase in manifold pressure that occurs when the throttle valve is opened.

Select the Airworthiness Directive applicability statement which applies to an IVO-355 engine, serial number T8164, with 2,100 hours' total time and 300 hours since rebuilding.

Applies to all IVO-355 engines, serial numbers T8000 through T8300, having less than 2400 hours' total time.

When must an Airworthiness Directive (AD) be complied with after it becomes effective?

As specified in the AD.

8766:How often should float carburetors be overhauled?

At engine overhaul

Which statement is true regarding jet engines?

At the higher engine speeds, thrust increases rapidly with smalls increases in RPM.

8746: Where should the main fuel strainer be located in the aircraft fuel system?

At the lowest point in the fuel system

8549: In a turbine engine DC capacitor discharge ignition system, where are the high-voltage pulses formed?

At the triggering transformer

What could cause a lean mixture and high cylinder head temperature at sea level or low altitudes?

Automatic mixture control stuck in the extended position.

66 (8066) - Engine crankshaft runout is usually checked 1. during engine overhaul.2. during annual inspection.3. after a 'prop strike' or sudden engine stoppage.4. during 100-hour inspection

B- 1 and 3.

99 (8099) - Which of these conditions will cause an engine to have an increased tendency to detonate?1. High manifold pressure.2. High intake air temperature.3. Engine overheated.4. Late ignition timing.

B- 1, 2, 3.

33 (8289) - Which of the following instrument discrepancies require replacement of the instrument?1. Red line missing from glass.2. Glass cracked.3. Case paint chipped.4. Will not zero out.5. Pointer loose on shaft.6. Mounting screw loose.7. Leaking at line B nut.8. Fogged.

B- 2, 4, 5, 8.

19 (8019) - Using the following information, determine how many degrees the crankshaft will rotate with both the intake and exhaust valves seated.Intake opens 15°: BTDC.Exhaust opens 70°: BBDC.Intake closes 45°: ABDC.Exhaust closes 10°: ATDC.

B- 245°.

30 (8030) - Ignition occurs at 28° BTDC on a certain four-stroke cycle engine, and the intake valve opens at 15° BTDC. How many degrees of crankshaft travel after ignition does the intake valve open? (Consider one cylinder only.)

B- 373°.

8 (8317) - What is the operating principle of the spot detector sensor in a fire detection system?

B- A conventional thermocouple that produces a current flow.

50 (8306) - Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type?

B- Bourdon tube.

90 (8090) - Which of the following engine servicing operations generally requires engine pre-oiling prior to starting the engine?

B- Engine installation.

18 (8274) - What basic meter is used to indicate cylinder head temperature in most aircraft?

B- Galvanometer.

16 (8272) - Which statement is correct concerning a thermocouple-type temperature indicating instrument system?

B- It requires no external power source.

24 (8333) - Two continuous-loop fire detection systems that will not test due to a broken detector element are the

B- Kidde system and the Fenwal system.

18 (8327) - A fire detection system operates on the principle of a buildup of gas pressure within a tube proportional to temperature. Which of the following systems does this statement define?

B- Lindberg continuous-element system.

7 (8007) - Which bearing is least likely to be a roller or ball bearing?

B- Master rod bearing (radial engine).

14 (8014) - Which statement is correct regarding engine crankshafts?

B- Moveable counterweights serve to reduce the torsional vibrations in an aircraft reciprocating engine.

23 (8279) - If the thermocouple leads were inadvertently crossed at installation, what would the cylinder temperature gauge pointer indicate?

B- Moves off-scale on the zero side of the meter.

27 (8027) - On which part of the cylinder walls of a normally operating engine will the greatest amount of wear occur?

B- Near the top of the cylinder.

95 (8095) - How may it be determined that a reciprocating engine with a dry sump is pre-oiled sufficiently?

B- Oil will flow from the engine return line or indicator port.

6 (8262) - On a twin-engine aircraft with fuel-injected reciprocating engines, one fuel-flow indicator reads considerably higher than the other in all engine operating configurations. What is the probable cause of this indication?

B- One or more fuel nozzles are clogged.

7 (8316) - A continuous-loop fire detector is what type of detector?

B- Overheat detector.

82 (8082) - What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines?

B- Reduced valve operating temperatures.

29 (8029) - When is the fuel/air mixture ignited in a conventional reciprocating engine?

B- Shortly before the piston reaches the top of the compression stroke.

13 (8269) - Which of the following types of electric motors are commonly used in electric tachometers?

B- Synchronous motors.

27 (8336) - Which of the following fire detection systems will detect a fire when an element is inoperative but will not test when the test circuit is energized?

B- The Kidde system and the Fenwal system.

38 (8038) - If the hot clearance is used to set the valves when the engine is cold, what will occur during operation of the engine?

B- The valves will open late and close early.

17 (8273) - Which statement is true regarding a thermocouple-type cylinder head temperature measuring system?

B- The voltage output of a thermocouple system is determined by the temperature difference between the two ends of the thermocouple.

1 (8001) - Which statement is true regarding bearings used in high-powered reciprocating aircraft engines?

B- There is less rolling friction when ball bearings are used than when roller bearings are employed.

8 (8264) - In addition to fuel quantity, a computerized fuel system (CFS) with a totalizer-indicator provides indication of how many of the following?1. Fuel flow rate.2. Fuel used since reset or initial start-up.3. Fuel time remaining at current power setting.4. Fuel temperature.

B- Three.

22 (8022) - What tool is generally used to measure the crankshaft rotation in degrees?

B- Timing disk.

2 (8311) - What is the function of a fire detection system?

B- To activate a warning device in the event of a powerplant fire.

48 (8048) - What is the purpose of a power check on a reciprocating engine?

B- To determine satisfactory performance.

4 (8004) - What is the principal advantage of using propeller reduction gears?

B- To enable the engine RPM to be increased with an accompanying increase in power and allow the propeller to remain at a lower, more efficient RPM.

73 (8073) - If an engine cylinder is to be removed, at what position in the cylinder should the piston be?

B- Top dead center.

38 (8294) - What instrument on a gas turbine engine should be monitored to minimize the possibility of a 'hot' start?

B- Turbine inlet temperature.

25 (8334) - In a fixed fire-extinguishing system, there are two small lines running from the system and exiting overboard. These line exit ports are covered with a blowout type indicator disc. Which of the following statements is true?

B- When the yellow indicator disc is missing, it indicates the fire-extinguishing system has been normally discharged.

33 (8033) - The valve clearance of an engine using hydraulic lifters, when the lifters are completely flat, or empty, should not exceed

B- a specified amount above zero.

10 (8266) - In an aircraft equipped with a pressure-drop type fuel-flow indicating system, if one of the injector nozzles becomes restricted, this would cause a decrease in fuel flow with

B- an increased fuel flow indication on the gauge.

27 (8283) - Thermocouple leads

B- are designed for a specific installation and may not be altered.

29 (8338) - After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donner fire detector, the detection system

B- automatically resets.

17 (8017) - The actual power delivered to the propeller of an aircraft engine is called

B- brake horsepower.

26 (8335) - The most satisfactory extinguishing agent for an electrical fire is

B- carbon dioxide.

63 (8063) - Excessive valve clearances will cause the duration of valve opening to

B- decrease for both intake and exhaust valves.

31 (8287) - Engine pressure ratio is determined by

B- dividing turbine outlet total pressure by engine inlet total pressure.

39 (8039) - The purpose of two or more valve springs in aircraft engines is to

B- eliminate valve spring surge.

70 (8070) - If the oil pressure of a cold engine is higher than at normal operating temperatures, the

B- engine's lubrication system is probably operating normally.

21 (8277) - Engine oil temperature gauges indicate the temperature of the oil

B- entering the engine.

69 (8069) - A hissing sound from the exhaust stacks when the propeller is being pulled through manually indicates

B- exhaust valve blow-by.

15 (8271) - Basically, the indicator of a tachometer system is responsive to change in

B- frequency.

41 (8297) - Engine pressure ratio is the total pressure ratio between the

B- front of the compressor and the rear of the turbine.

2 (8258) - The fuel flowmeter used with a continuous-fuel injection system installed on an aircraft horizontally opposed reciprocating engines measures the fuel pressure drop across the

B- fuel nozzles.

7 (8263) - The fuel-flow indication system used with many fuel-injected opposed engine airplanes utilizes a measure of

B- fuel pressure.

12 (8268) - The purpose of an exhaust gas analyzer is to indicate the

B- fuel/air ratio being burned in the cylinders.

76 (8076) - Standard aircraft cylinder oversizes usually range from 0.010 inch to 0.030 inch. Oversize on automobile engine cylinders may range up to 0.100 inch. This is because aircraft engine cylinders

B- have relatively thin walls and may be nitrided

74 (8074) - The horsepower developed in the cylinders of a reciprocating engine is known as the

B- indicated horsepower.

59 (8059) - If metallic particles are found in the oil filter during an inspection,

B- the cause should be identified and corrected before the aircraft is released for flight.

53 (8309) - A red triangle, dot, or diamond mark on an engine instrument face or glass indicates

B- the maximum limit for high transients such as starting.

31 (8340) - For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on

B- the volume and smoothness of the airflow through engine compartments.

22 (8331) - A fire detection system that operates on the rate-of-temperature rise is a

B- thermocouple system..

40 (8040) - During overhaul, the disassembled parts of an engine are usually degreased with some form of mineral spirits solvent rather than water-mixed degreasers primarily because

B- water-mixed degreaser residues may cause engine oil contamination in the overhauled engine.

30 (8339) - The use of water on class D fires

B- will cause the fire to burn more violently and can cause explosions.

28 (8028) - During overhaul, reciprocating engine exhaust valves are checked for stretch

B- with a contour or radius gauge.

8536: When using a timing light to time a magneto to an aircraft engine, the magneto switch should be placed in the

BOTH position

8567: Which of the following, obtained during magneto check at 1,700 RPM, indicates a short (grounded) circuit between the right magneto primary and the ignition switch?

BOTH- 1,700 RPM, R- 0 RPM, L- 1,700 RPM, OFF- 0 RPM

Which of the following is least likely to occur during operation of an engine equipped with a direct cylinder fuel injection system?

Backfiring.

Why must a float-type carburetor supply a rich mixture during idle?

Because at idling speeds the engine may not have enough airflow around the cylinders to provide proper cooling.

8594: In a four-stroke cycle aircraft engine, when does the ignition event take place?

Before the piston reaches TDC on compression stroke

Which of the following influences the operation of an automatic fuel control unit on a turbojet engine?

Burner pressure.

How are discharge nozzles in a fuel injected to indicate the flow range?

By an indication letter stamped on one of the hexes of the nozzle body.

8551: How are most radial engine spark plug wires connected to the distributor block?

By use of the cable-piercing screws

9 (8009) - A nine-cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of

C- 1,283 cubic inches.

5 (8005) - Which of the following will decrease volumetric efficiency in a reciprocating engine?1. Full throttle operation.2. Low cylinder head temperatures.3. Improper valve timing.4. Sharp bends in the induction system.5. High carburetor air temperatures

C- 3, 4, and 5.

3 (8312) - (Refer to Figure 2.) Determine the fire-extinguisher container pressure limits when the temperature is 75°F.

C- 338 minimum and 424 maximum.

65 (8065) - At what speed must a crankshaft turn if each cylinder of a four-stroke cycle engine is to be fired 200 times a minute?

C- 400 RPM.

32 (8341) - (Refer to Figure 3.) What are the fire-extinguisher container pressure limits when the temperature is 50°F?

C- 475 - 625 PSIG.

36 (8292) - Which of the following instrument conditions is acceptable and does NOT require immediate correction?1. Red line missing.2. Pointer loose on shaft.3. Glass cracked.4. Mounting screws loose.5. Case paint chipped.6. Leaking at line B nut.7. Will not zero out.8. Fogged.

C- 5

46 (8046) - The volume of a cylinder equals 70 cubic inches when the piston is at bottom center. When the piston is at the top of the cylinder, the volume equals 10 cubic inches. What is the compression ratio?

C- 7:1

72 (8072) - Which fuel/air mixture will result in the highest engine temperature (all other factors remaining constant)?

C- A mixture leaner than a manual lean mixture of .060.

49 (8049) - What will be the likely result if the piston ring gaps happen to be aligned when performing a differential-pressure compression check on a cylinder?

C- A worn or defective ring(s) indication.

100 (8100) - When will small induction system air leaks have the most noticeable effect on engine operation?

C- At low RPM.

64 (8064) - What does valve overlap promote?

C- Better scavenging and cooling characteristics.

35 (8291) - An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbosupercharged aircraft engine is known as

C- Bootstrapping.

10 (8319) - Which of the following is the safest fire-extinguishing agent to use from a standpoint of toxicity and corrosion hazards?

C- Bromotrifluoromethane (Halon 1301).

45 (8045) - How is proper end-gap clearance on new piston rings assured during the overhaul of an engine?

C- By placing the rings in the cylinder and measuring the end-gap with a feeler gauge

6 (8006) - Which of the following is a characteristic of a thrust bearing used in most radial engines?

C- Deep-groove ball.

49 (8305) - Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?

C- Diaphragm or bellows.

61 (8061) - What special procedure must be followed when adjusting the valves of an engine equipped with a floating cam ring?

C- Eliminate cam bearing clearance when making valve adjustment.

46 (8302) - What instrument indicates the thrust of a gas turbine engine?

C- Engine pressure ratio indicator.

15 (8015) - On which strokes are both valves on a four-stroke cycle reciprocating aircraft engine open?

C- Exhaust and intake.

47 (8303) - In a turbine engine, where is the turbine discharge pressure indicator sensor located?

C- Immediately aft of the last turbine stage.

20 (8329) - The fire detection system that uses two wires imbedded in a ceramic core within a tube is the

C- Kidde system.

94 (8094) - Which of the following would most likely cause a reciprocating engine to backfire through the induction system at low RPM operation?

C- Lean mixture.

3 (8003) - Which condition would be the least likely to be caused by failed or failing engine bearings?

C- Low oil temperatures.

43 (8299) - What is the primary purpose of the tachometer on an axial-compressor turbine engine?

C- Monitor engine RPM during starting and to indicate overspeed conditions.

54 (8054) - After spark plugs from an opposed engine have been serviced, in what position should they be reinstalled?

C- Next in firing order to the one from which they were removed and swapped bottom to top.

22 (8278) - Why do helicopters require a minimum of two synchronous tachometer systems?

C- One indicates engine RPM and the other main rotor RPM.

106 (8106) - If air is heard coming from the crankcase breather or oil filler during a differential compression check, what is this an indication of?

C- Piston ring leakage.

1 (8310) - Which of the following fire detectors are commonly used in the power section of an engine nacelle?

C- Rate-of-temperature-rise detectors.

96 (8096) - What is the basic operational sequence for reducing the power output of an engine equipped with a constant-speed propeller?

C- Reduce the manifold pressure, then the RPM.

15 (8324) - Why does one type of Fenwal fire detection system use spot detectors wired in parallel between two separate circuits?

C- So that a single fault may exist in the system without sounding a false alarm.

9 (8318) - How is the fire-extinguishing agent distributed in the engine section?

C- Spray nozzles and perforated tubing.

14 (8270) - Where are the hot and cold junctions located in an engine cylinder temperature indicating system?

C- The hot junction is located at the cylinder and the cold junction is located at the instrument.

55 (8055) - As the pressure is applied during a reciprocating engine compression check using a differential pressure tester, what would a movement of the propeller in the direction of engine rotation indicate?

C- The piston was positioned past top dead center.

35 (8035) - How many of the following are factors in establishing the maximum compression ratio limitations of an aircraft engine?1. Detonation characteristics of the fuel used.2. Design limitations of the engine.3. Degree of supercharging.4. Spark plug reach.

C- Three.

31 (8031) - What is the purpose of the safety circlet installed on some valve stems?

C- To prevent valves from falling into the combustion chamber.

42 (8298) - What would be the possible cause if a gas turbine engine has high exhaust gas temperature, high fuel flow, and low RPM at all engine power settings?

C- Turbine damage or loss of turbine efficiency.

92 (8092) - Which of the following conditions would most likely lead to detonation?

C- Use of fuel with too low an octane rating.

25 (8281) - The indication on a thermocouple-type cylinder head temperature indicator is produced by

C- a current generated by the temperature difference between dissimilar metal hot and cold junctions.

78 (8078) - During ground check an engine is found to be rough-running, the magneto drop is normal, and the manifold pressure is higher than normal for any given RPM. The trouble may be caused by

C- a dead cylinder.

23 (8023) - If an engine with a stroke of 6 inches is operated at 2,000 RPM, the piston movement within the cylinder will be

C- at maximum velocity 90° after TDC.

24 (8024) - If the intake valve is opened too early in the cycle of operation of a four-stroke cycle engine, it may result in

C- backfiring into the induction system.

91 (8091) - During the inspection of an engine control system in which push-pull control rods are used, the threaded rod ends should

C- be checked for the amount of thread engagement by means of the inspection holes.

30 (8286) - (1) Generally, when a turbine engine indicates high EGT for a particular EPR (when there is no significant damage), it means that the engine is out of trim.(2) Some turbine-powered aircraft use RPM as the primary indicator of thrust produced, others use EPR as the primary indicator.Regarding the above statements,

C- both No. 1 and No. 2 are true.

44 (8044) - (1) Cast iron piston rings may be used in chrome-plated cylinders.(2) Chrome-plated rings may be used in plain steel cylinders.Regarding the above statements,

C- both No. 1 and No. 2 are true.

36 (8036) - Full-floating piston pins are those which allow motion between the pin and

C- both the piston and the small end of the connecting rod.

23 (8332) - A fire involving energized electrical equipment is defined as a

C- class C fire.

34 (8034) - If the exhaust valve of a four-stroke cycle engine is closed and the intake valve is just closed, the piston is on the

C- compression stroke.

51 (8051) - The floating control thermostat, used on some reciprocating engine installations, helps regulate oil temperature by

C- controlling air flow through the oil cooler.

42 (8042) - Compression ratio is the ratio between the

C- cylinder volume with piston at bottom dead center and at top dead center.

104 (8104) - Excessive valve clearance in a piston engine

C- decreases valve overlap.

51 (8307) - The RPM indication of a synchronous ac motor-tachometer is governed by the generator

C- frequency.

3 (8259) - The principal fault in the pressure type fuel flowmeter indicating system, installed on a horizontally opposed continuous-flow fuel injected aircraft reciprocating engine, is that a plugged fuel injection nozzle will cause a

C- higher than normal fuel flow indication.

2 (8002) - A condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is

C- hydraulic lock.

85 (8085) - An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to

C- increase.

11 (8267) - A manifold pressure gauge is designed to

C- indicate absolute pressure in the intake manifold.

10 (8010) - The five events of a four-stroke cycle engine in the order of their occurrence are

C- intake, compression, ignition, power, exhaust.

12 (8012) - If fuel/air ratio is proper and ignition timing is correct, the combustion process should be completed

C- just after top center at the beginning of the power stroke.

93 (8093) - An unsupercharged aircraft reciprocating engine, operated at full throttle from sea level, to 10,000 feet, provided the RPM is unchanged, will

C- lose power due to the reduced density of the air drawn into the cylinders.

37 (8293) - A change in engine manifold pressure has a direct effect on the

C- mean effective cylinder pressure.

89 (8089) - (1) Preignition is caused by improper ignition timing.(2) Detonation occurs when an area of the combustion chamber becomes incandescent and ignites the fuel/air mixture in advance of normal timed ignition.Regarding the above statements,

C- neither No. 1 nor No. 2 is true.

37 (8037) - The primary purpose in setting proper valve timing and overlap is to

C- obtain the best volumetric efficiency and lower cylinder operating temperatures.

13 (8013) - Grinding the valves of a reciprocating engine to a feather edge is likely to result in

C- preignition and burned valves.

83 (8083) - Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by

C- push rod replacement.

75 (8075) - Engine operating flexibility is the ability of the engine to

C- run smoothly and give the desired performance at all speeds.

58 (8058) - A characteristic of dyna-focal engine mounts as applied to aircraft reciprocating engines is that the

C- shock mounts point toward the engine's center of gravity.

77 (8077) - If the ignition switch is moved from BOTH to either LEFT or RIGHT during an engine ground check, normal operation is usually indicated by a

C- slight drop in RPM.

102 (8102) - One of the best indicators of reciprocating engine combustion chamber problems is

C- spark plug condition.

45 (8301) - The exhaust gas temperature (EGT) indicator on a gas turbine engine provides a relative indication of the

C- turbine inlet temperature.

67 (8067) - Before attempting to start a radial engine that has been shut down for more than 30 minutes,

C- turn the propeller by hand three to four revolutions in the normal direction of rotation to check for liquid lock.

(Refer to Figure 6) Which curve most nearly represents an aircraft engine's fuel/air ratio throughout its operating range?

C-2

In which type of turbine engine combustion chamber is the case and liner removed and installed as one unit during routine maintenance?

Can.

8780: During full power output of an unsupercharged engine equipped with a float-type carburetor, in which of the following areas will the highest pressure exit?

Carburetor air scoop

Which of the following can inspect and approve an engine major repair for return service?

Certificated mechanic with inspection authorization.

During idle mixture adjustments, which of the following is normally observed to determine when the correct mixture has been achieved?

Changes in RPM or manifold pressure.

Which of the following component inspections is to be accomplished on a 100-hour inspection?

Check cylinder compression.

What is the possible cause of an engine running rich at full throttle if it is equipped with a float-type carburetor?

Clogged main air bleed.

8550: Which of the following breaker point characteristics is associated with a faulty capacitor?

Coarse grained

8804: When starting an engine equipped with a carburetor air heater, in what position should the heater be placed?

Cold

What turbine engine section provides for proper mixing of the fuel and air?

Combustion section.

8791: What is th purpose of a turbocharger system for a small reciprocating aircraft eninge?

Compresses air to maintain manifold pressure constant from sea level to the critical altitude of the engine

At what stage in a turbine engine are gas pressures the greatest?

Compressor outlet.

8604: What is a result of "flashover" in a distributor?

Conductive carbon trail.

A major difference between the Teledyne-Continental and RSA (Precision Airmotive or Bendix) continuous flow fuel injection systems in fuel metering is that the

Continental system uses fuel pressure only as a metering force.

8810: If a fire starts in the induction system during the engine starting procedure, what should the operator do?

Continue craning the engine

What is one purpose of the stator blades in the compressor section of a turbine engine?

Control the direction of the airflow.

8789: What is the purpose of the rate-of-change controller in a turbocharger system?

Controls the rate at which the turbocharger discharge pressure will increase

8546: When removing a shielded spark plug, which of the following is most likely to be damaged?

Core insulator

A turbine engine hot section is particularly susceptible to which kind of damage?

Cracking.

Which of the following conditions is usually not acceptable to any extent in turbine blades?

Cracks.

8764: What is the purpose of the flow divider in a turbine engine duplex fuel nozzle?

Creates the primary and secondary fuel supplies

One function of the nozzle diaphragm in a turbine engine is to

Direct the flow of gases to strike the turbine blades at the desired angle.

A ground incident that results in propeller sudden stoppage would require a crankshaft runout inspection. What publications would be used to obtain crankshaft runout tolerance?

Current manufacturer's maintenance instructions.

What type of electric motor is generally used with a direct-cranking engine starter?

Direct current, series wound motor.

When installing an electrical switch, under which of the following conditions should the switch be derated from its nominal current rating?

Direct-current motor circuits

Which is the function of the inlet guide vanes assembly on an axial-flow compressor?

Directs the air into the fist stage rotor blades at the proper angle.

8544: A certain nine-cylinder radial engine used a non-compensated single-unit, dual-type magneto with a four pole rotating magnet and separately mounted distributors. Which of the following will have the lowest RPM at any given engine speed?

Distributors

Select the statement which is correct relating to a fuel level check of a float-type carburetor.

Do not measure the level at the edge of the float chamber.

What type of oil system found on turbine engines?

Dry sump, pressure, and spray.

8990: What method would be used to inspect an aluminum propeller blade when a crack is suspected

Dye-penetrant

Which of the following is sued to monitor the mechanical integrity of the turbines, as wells as to check engine operating conditions of a turbine engine?

EGT.

When troubleshooting an engine for too rich a mixture to allow the engine to idle, what would be a possible cause?

Economizer valve not operating correctly.

8770: What precaution should be taken when putting thread lubricant on a tapered pipe plug in a carburetor float bowl?

Engage the first thread of the plug, then put a small amount of lubricant on the second thread and screw the plug in

What publication contains the mandatory replacement time for parts of a turbine engine?

Engine Manufacturer's service instructions.

What is the possible cause when a turbine engine indicates no changes in power setting parameters, but oil temperature is high?

Engine main bearing distress.

8615: (Refer to Figure 5) With power applied to the bus bar, what switch changes will allow the ignition exciters test switch to function?

Engine master switch and ignition switch

8807: When operating an engine, the application of carburetor heat will have what effect on the fuel/air mixture?

Enriching the mixture until the AMC can make a compensation

What maintenance record(s) is/are required following a major repair of an aircraft engine?

Entries in the maintenance record and FAA Form 337.

Newton's First Law of Motion generally termed the Law of Inertia, states:

Every body persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force.

In what section of a turbojet engine is the jet nozzle located?

Exhaust.

The airworthiness standard for the issue of type certificates for small airplanes with nine or less passenger seats in the normal, utility, and acrobatic categories may be found in the

FAR, Part 23

What publication is sued for guidance to determine whether a powerplant repair is major or minor?

FAR, Part 43, Appendix A.

As a general rule, the mixture g setting on a reciprocating engine operating at or near take off power that provides the best cooling is

FULL RICH

What is the maximum number of bonding jumper wires that may be attached to one terminal grounded to a flat surface?

Four

Which statement is correct regarding a continuous flow fuel injection system used on many reciprocating engines?

Fuel is injected at each cylinder intake port.

Which of the following lubrication system components is never located between the pressure pump and the engine pressure system?

Fuel line for oil dilution system.

8765: What causes the fuel divider valve to open in a turbine engine duplex fuel nozzle

Fuel pressure

What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?

Fuel specific gravity setting.

8506: The greatest density of flux lines in the magnetic circuit of a rotating magnet-type magneto occurs when the magnet is in what position?

Full alignment with the field shoe faces

8609: What is the approximate position of the rotating magnet in a high-tension magneto when the points first close?

Full register

8795: What is used to drive a supercharger?

Gear train from the crankshaft

If the points in a vibrator type voltage regulator stick in the closed position while the generator is operating, what will be the probable result?

Generator output voltage will increase.

What is the primary advantage of an axial-flow compressor over a centrifugal compressor?

Greater pressure ratio.

8547: What likely effect would a cracked distributor rotor have on a magneto?

Ground the secondary coil through the crack

8545: What will be the effect if the spark plugs are gapped too wide?

Hard starting

How does a dual axial-flow compressor improve the efficiency of turbojet engine?

Higher compression ratios can be obtained.

8504: How is the strength of a magneto magnet checked?

Hold the points open and check the output of the primary coil with an AC ammeter while operating the magneto at a specified speed

8620: In a typical starter-generator system, under which of the following starting circumstances may it be necessary to use the start stop switch?

Hung start

Which type of fuel control is used on most of today's turbine engines?

Hydromechanical or electronic.

What are the two functional elements in a centrifugal compressor?

Impeller and diffuser.

8785: Which of the following would be a factor in the failure of an engine to develop full power at takeoff?

Improper adjustment of carburetor heat valve control linkage

8564: Which of the following could cause damage to the nose ceramic or to the electrode of an aircraft spark plugs?

Improper gapping procedure

What type of turbine blade is most commonly used in aircraft jet engines?

Impulse-reaction.

8513: What is the electrical location of the primary capacitor in a high-tension magneto?

In parallel with the breaker points

8579: Which of the following statements regarding magneto switch circuits is NOT true?

In the BOTH position, the right and left magneto circuits are grounded

Where is the highest gas pressure in a turbojet engine?

In the entrance of the burner section.

Under which of the following conditions would an engine run lean even though there is a normal amount of fuel present?

Incomplete fuel vaporization.

8586: Which of the following would be cause for rejection of a spark plug?

Insulator tip cracked

What is a function of the idling air bleed in a float-type carburetor?

It aids in emulsifying/vaporizing the fuel at idle speeds.

8783: Which of the following statements regarding volumetric efficiency of an engine is true?

It is possible to exceed 100 percent volumetric efficiency of some engines by the use of supercharges of the proper type

8748: What is a characteristic of a centrifugal-type fuel boost pump?

It seperates air and vapor from the fuel

The economizer system of a float-type carburetor performs which of the following functions?

It supplies and regulates the additional fuel required for all engine speeds above cruising.

How will the mixture of an engine be affected if the bellows of the automatic mixture control (AMC) in a pressure carburetor ruptures while the engine is operating at altitude?

It will become richer.

8521: When the voltage in the secondary winding of a magneto, installed on a normally operating engine, be at its highest value?

Just prior to spark plug firing

8943: For takeoff, a constant-speed propeller is normally set in the

LOW PITCH, high RPM position

Main bearing oil seals used with turbine engines are usually what type(s)?

Labyrinth and/or carbon rubbing.

8788: What I the purpose of the density controller in a turbocharger system?

Limits the maximum manifold pressure that can be produced by the turbocharger at fill throttle

8914: Which of the following best describes the blade movement of a propeller that is in the high RPM position when reversing action is begun

Low pitch directly to reverse pitch

Which of the following contains approved data for performing a major repair to an aircraft engine?

Manufacturer's maintenance instructions when FAA approved.

From the following, identify the factor that has the least effect on the oil consumption of a specific engine.

Mechanical efficiency.

8763: Which of the following turbine fuel filters has the greatest filtering action of any present-day filter type?

Micron filter

What factor is not used in the operation of an aircraft gas turbine engine fuel control unit?

Mixture control position

Which of following types of combustion sections are used in aircraft turbine engines?

Multiple-can, annular, and can-annular.

In the dual axial-flow or twin spool compressor system, the first stage turbine drives the

N(2) compressor.

What is the relationship between the accelerating pump and the enrichment valve in a pressure injection carburetor?

No relationship since they operate independently.

What is the smallest terminal stud allowed for aircraft electrical power system?

No.10

The following data concerning the installation of an electrical unit is known: current requirements for continuous operation--11 amps; measured cable lenght--45ft; system voltage--28v; cable in conduit and bundles. What is the minimum size copper electrical cable that my be selected?

No.12

8778: Where would a carburetor air heatr be located in a fuel injection system?

None is required

What is the primary factor which controls the pressure ratio of an axial-flow compressor?

Number of stages in compressor.

A nine-cylinder radial engine, using a multiple-point priming system with a central spider, will prime which cylinders?

One, two, three, eight, and nine.

When the leading edge of a first-stage turbine blade is found to have stress rupture cracks, which of the following should be suspected?

Overtemperature condition.

8587: What will be the result of using too hot a spark plug

Preignition

What are the positions of the pressurization valve and the dump valve in a jet engine fuel system when the engine is shut down?

Pressurization valve closed, dump valve open.

Which of the following contains a table that lists the engines to which a given propeller is acceptable?

Propeller Type Certificate Data Sheets.

8761: What are the principal advantages of the duplex fuel nozzle used in many turbine engines?

Provides better atomization and uniform flow pattern

8627: Pneumatic starters are usually designed with what types of airflow impingement systems?

Radial inward flow turbine and axial-flow turbine

8601: How does high-tension ignition shielding tend to reduce radio interference?

Receives and grounds high-frequency waves coming from the magneto and high-tension ignition leads

Which of the following is NOT a function of the carburetor venturi?

Regulates the idle system.

Which of the following best describes the function of an altitude mixture control?

Regulates the richness of the fuel/air charge entering the engine.

What corrective action should be taken when a carburetor is found to be leaking fuel from he discharge nozzle?

Replace the needle valve and seat.

What must be done after the fuel control unit has been replaced on an aircraft gas turbine engine?

Retrim the engine.

8738: Most large aircraft reciprocating engines are equipped with which of the following types of engine driven fuel pumps?

Rotary-vane-tpe fuel pump

8610: What component of a dual magneto is shared by both ignition systems?

Rotating magnet

8519: What components make up the magnetic system of a magneto?

Rotating magnet, the pole shoes, the pole shoe extension and the coil core

What type igniter plug is used in the low tension ignition system of an aircraft turbofan engine?

Self-ionizing or shunted-gap type plug.

Electric motors are often classified according to the method of connecting the field coils and armature. Aircraft engine starter motors are generally of which type?

Series

8797: What method(s) is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) seperators intalled?

Sharp airflow directioinal change to take advantage of inertia and/or centrifugal force, and filters or engine inlet screens

8503: When a magneto is disassembled, keepers are usually placed across poles of the rotating magnet to reduce loss of magnetism. These keepers are usually made of

Soft iron

Which turbine engine compressor offers the greatest advantage for both starting flexibility and improved high-altitude performance?

Split-spool, axial-flow.

what is the proper starting sequence for a turbojet engine?

Starter, ignition, fuel.

What are the tow basic elements of the turbine section in a turbine engine?

Stator and rotor.

When aircraft turbine blades are subjected to excessive heat stress, what type of failures would you expect?

Stress rupture.

What is the major function of the turbine assembly in a turbojet engine?

Supplies the power to turn the compressor.

8767: What is the final authority for the details of carburetor overhaul

The manufacturer's recommendation

Which of the following has the greater effect on the viscosity of lubricating oil?

Temperature.

What is the purpose of the carburetor accelerating system?

Temporarily enrich the mixture when the throttle is suddenly opened.

Where would one find type design information for an R1830-92 engine certificated under the Civil Air Regulations (CAR) and installed on a DC-3?

The Aircraft Engine Specifications.

8774: Into what part of a reciprocating engine induction system is deicing alchol normally injected?

The airstream ahead of the carburetor

What will occur if the vapor vent float in a pressure carburetor loses its buoyancy?

The amount of fuel returning to the fuel tank from the carburetor will be increased.

8555: When a magneto is operating, what is the probable cause for a shift in internal timing?

The cam follower wear and/or breaker points wear

8733: Which of the following statements concerning a centrifugal-type fuel boost pump located in a fuel supply tank is NOT true?

The centrifugal-type pump is classified as a posiitive displacement pump

8557: The constrained-gap igniter plug used in some gas turbine engines operates at a cooler temperature because

The construction is such that the spark occurs beyond the face of the combustion chamber liner

8605: What is the relationship between the distributor and crankshaft speed of aircraft reciprocating engines?

The distributor turns at one-half crankshaft speed

Who establishes mandatory replacement times for critical components of turbine engines?

The engine manufacturer.

Who establishes the recommended operating time between overhauls (TBO) of a turbine engine used in general aviation?

The engine manufacturer.

What occurs when a back-suction type mixture control is placed in IDLE CUTOFF?

The float chamber will be vented to a negative pressure area.

8968: Which of the following occurs to cause front cone bottoming during propeller installation

The front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub

What is the purpose of the dump valve used on aircraft gas turbine engines?

The fuel is quickly cut off to the nozzles and the manifolds are drained preventing fuel boiling off as a result of residual engine heat.

8556: Why are turbine engine igniters less susceptible to fouling than reciprocating engine spark plug?

The high-intensity spark cleans igniter

Select the correct statement concerning the idle system of a conventional float-type carburetor.

The low pressure between the edges of the throttle valve and the throttle body pulls the fuel from the idle passage.

8806: The application of carburetor heat will have which of the following effects?

The mixture will become richer

What will be the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature?

The oil pressure will be lower than normal.

8611: What would be the result if a magneto breaker point mainspring did not have sufficient tension?

The points will float or bounce

What is the relationship between the pressure existing within the throat of a venturi and the velocity of the air passing through the venturi?

The pressure is inversely proportional to the velocity.

8608: At what RPM is a reciprocating engine ignition switch check made?

The slowest possible RPM

8569: Which statement is correct regarding the ignition system of a turbine engine?

The system is normally de-energized as soon as the engine starts

8769: Which statement is true regarding proper throttle rigging of an airplane?

The throttle stop on the carburetor must be contacted before the stop in the cockpit

You are performing a 100- hour inspection on an R985-22 aircraft engine. What does the 985 indicate?

The total piston displacement of the engine.

8736: (Refer to Figure 7) What is the purpose of the fuel transfer ejectors?

To assist in the transfer of fuel from the main tank to the boost pump sump

8510: What is the purpose of a safety gap in some magnetos?

To discharge the secondary coil's voltage if an open occurs in the secondary circuit

Why do some turbine engines have more than one turbine wheel attached to a single shaft?

To extracto more power form the exhaust gases than a single wheel can absorb.

8606: Why do turbine engine ignition systems require high energy?

To ignite the fuel under conditions of high altitude and low temperatures

What is the purpose of the diffuser section in a turbine engine?

To increase the pressure and reduce velocity.

For what primary purpose is a turbine engine fuel control unit trimmed?

To obtain maximum thrust output when desired.

8737: What is the purpose of an engine-driven fuel pump bypass-valve?

To prevent a damaged or inoperative pump from blocking the fuel flow of another pump in series with it.

8531: What is the purpose of using an impulse coupling with a magneto?

To produce a momentary high rotational speed of the magneto

8508: Why are high-tension ignition cables frequently routed from the distributors to the spark plugs in flexible metallic conduits?

To reduce the effect of the high-frequency electromagnetic waves emanated during operation

8956: What operational force causes propeller blade tips to lag in the opposite direction of rotation

Torque-bending force

Oil picks up the most heat from which of the following turbine engine components?

Turbine bearing.

Dirt particles in the air being introduces into the compressor of a turbine engine will form a coating on all but which of the following?

Turbine blades.

Which of the following engine variables is the most critical during turbine engine operation?

Turbine inlet temperature.

Which of the following is the ultimate limiting factor of turbine engine operation?

Turbine inlet temperature.

A gas turbine engine comprises which three main sections?

Turbine, compressor, and combustion.

What should be done initially if a turbine engine catches fire when starting?

Turn off the fuel and continue engine rotation with the starter.

8741: Which type of pump is commonly used as a fuel pump in reciprocating engines?

Vane

What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?

Variable guide vanes and/or compressor bleed valves.

When air passes through the venturi of a carburetor, what three changes occur?

Velocity increases, temperature decreases, and pressure decreases.

What carburetor component actually limits the desired maximum airflow to the engine at full throttle?

Venturi.

What carburetor component measures the amount of air delivered to the engine?

Venturi.

8790: What directly regulates the speed of a turbocharger?

Waste gate

8732: During what period does the fuel pump bypass valve open and remain open?

When the boost pump pressure is greater than fuel pump pressure

8581: When does battery current flow through the primary circuit of a battery ignition coil?

When the breaker points are closed and the ignition switch is on

8583: When performing a magneto ground check on an engine, correct operation is indicated by

a slight drop in RPM

8824: Which of the following assists in removing heat from the metal walls and fins of an air-cooled cylinder assembly

a baffle and cowl arrangement

8518: Capacitance afterfiring in most modern spark plugs is reduced by the use of

a built-in resistor in each plug

What device is used to convert alternating current, which has been induces into the loops of the rotating armature of a dc generator, to direct current?

a commutator.

8775: Carburetor icing on an engine equipped with a constant-speed propeller can be detected by

a decrease in manifold pressure with a constant RPM

8781: The use of the carburetor air heater when it is not needed causes

a decrease in power and possibility detonation

When selecting an electrical switch for installation in an aircraft circuit utilizing a direct current motor

a derating factor should be applied.

8840: What is the function of a blast tube as found on aircraft engines

a device to cool an engine accessory

8831: Reciprocating engines used in helicopters are cooled by

a fan mounted on the engine

Hot spots on the tail cone of turbine engine are possible indicators of a malfunctioning fuel nozzle or

a fault combustion chamber.

8512: When internally timing a magneto, the breaker points begin to open when the rotating magnet is

a few degrees past the neutral position

8554: If it is found that a shielded ignition system does not adequately reduce ignition noise, it may be necessary to install

a filter between the magneto and magneto switch

Compressor stall is caused by

a high angle of attack airflow through the first stages of compression.

8575: When testing a magneto distributor block for electrical leakage, which of the following pieces of test equipment should be used?

a high-tension harness tester

When starting a turbine engine,

a hot start indicated if the exhaust gas temperature exceeds specified limits.

8799: Vortex dissipator systems are generally activated by

a landing gear switch

8966: What normally prevents a Hartzell Compact propeller from going to feather when the engine is shut down on the ground

a latch mechanism composed of springs and lock pins

If a float-type carburetor becomes flooded, the condition is most likely cause by

a leaking needle valve and seat assembly.

A weak fuel to air mixture along with normal airflow through a turbine engine may result in

a lean die-out.

8991: Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is

a major repair

A condition known as 'hot streaking' in turbine engines is caused by

a partially clogged fuel nozzle.

8588: Upon inspection of the spark plugs in an aircraft engine, the plugs were found caked with a heavy black soot. This indicates

a rich mixture

The use of less than normal throttle opening during starting will cause

a rich mixture.

What is the first engine instruments indication of a successful start of a turbine engine?

a rise in the exhaust gas temperature.

On an engine equipped with a pressure-type carburetor, fuel supply in the idling range is ensured by the inclusion in the carburetor of

a spring in the unmetered fuel chamber to supplement the action of normal metering forces.

8751: A pilot reports that the fuel pressure fluctuates and exceeds the upper limits whenever the throttle is advanced. The most likely cause of the trouble is

a sticking fuel pump relief valve

8798: The vortex dissipators installed on some turbine-powered aircraft to prevent engine FOD utilize

a stream of engine bleed air blown toward the ground ahead of the engine

8784: Bootstrapping of a turbocharged engine is indicated by

a transient increase in engine power

8836: High cylinder head temperatures are likely to result from

a very lean mixture at high power settings

When installing electrical wiring parallel to ta fuel line, the wiring should be

above the fuel line

8756: If an engine equipped with a float-type carburetor backfires or misses when the throttle is advanced, a likely cause is that the

accelerating pump is not operating properly

A carburetor is prevented from leaning out during quick acceleration by the

accelerating system.

The stationary field strength in a direct current generator is varied

according to the load requirements

The fuel metering force of a conventional float-type carburetor in its normal operating range is the difference between the pressure acting on the discharge nozzle located within the venturi and the pressure

acting on the fuel in the float chamber.

8630: Airflow to the pneumatic starter from a ground unit is normally prevented from causing starter overspeed during engine start by

activation of a flyweight cutout switch

8952: A constant-speed propeller provides maximum efficiency by

adjusting blade angle for most conditions encountered in flight

8889: A propeller synchrophasing system allows a pilot to reduce noise and vibration by

adjusting the phase angle between the propellers on an aircraft's engines

A supervisory electronic engine control (EEC) is a system that receives engine operation information and

adjusts a standard hydromechanical fuel control unit to obtain the most effective engine operation.

8911: What operational force tends to increase propeller blade angle

aerodynamic twisting force

Generally, when starting a turbine engine, the starter should be disengaged

after the engine has reached self-accelerating speed.

The primary purpose of the air bleed openings used with continuous flow fuel injector nozzles is to

aid in proper fuel vaporization.

8837: The purpose of an intercooler when used with a turbocharger is to cool the

air entering the carburetor from the turbocharger

8773: Carburetor icing is most severe at

air temperature between 30 and 40F

During the operation of an aircraft engine, the pressure drop in the carburetor venturi depends primarily upon the

air velocity.

8584: Defective spark plugs will cause the engine to run rough at

all speeds

8786: If the turbocharger waste gate is completely closed,

all the exhaust gases are directed through the turbine

A cool-off period prior to shutdown of a turbine engine is accomplished in order to

allow the turbine wheel to cool before the case contracts around it.

A reciprocating engine automatic mixture control responds to changes in air density caused by changes in

altitude or temperature.

high tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of

an EP lubricant.

8996: Cold straightening a bent aluminum propeller blade may be accomplished by

an appropriately rated repair station or the manufacturer

8924: The thrust produced by a rotating propeller is a result of

an area of decreased pressure immediately in front of the propeller blades

8999: An APU is usually rotated during start by

an electric starter

When checking the idle mixture on a carburetor, the engine should be idling normally, then pull the mixture control toward the IDLE CUTOFF position, A correct idling mixture will be indicated by

an increase of 10 to 50 RPM before decreasing.

8534: Failure of an engine to cease firing after turning the magneto switch off is an indication of

an open P-lead to ground

Generator voltage will not build up when the field is flashed and solder is found on the brush cover plate. These are most likely indication of

an open armature.

8568: If an aircraft ignition switch s turned off and the engine continues to run normally, the trouble is probably caused by

an open ground lead in the magneto

8947: Which of the following defects is cause for rejection of wood propellers

an oversize hub or bolthole, or elongated boltholes

When a new carburetor is installed on an engine,

and the engine is warmed up to normal temperatures, adjust the idle mixture, then the idle speed.

8891: Grease used in aircraft propellers reduces the frictional resistance of moving parts and is easily molded into any form under pressure. This statement defines

antifriction and plasticity characteristics of grease

What type of oil do most engine manufacturers recommend after new reciprocating engine break-in?

ashless-disperant oil.

In a reciprocating engine oil system, the temperature bulb senses oil temperature.

at a point after the oil has passed through the oil cooler.

At what point in an axial-flow turbojet engine will the highest gas pressures occur?

at the compressor outlet.

9005: Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained

automatically by the APU fuel control system

8753: Fuel pump relief valves designed to compensate for atmospheric pressure variations are known as

balanced-type relief valves

On a carburetor without an automatic mixture control as you ascend to altitude, the mixture will

be enriched.

8976: Maximum taper contact between crankshaft and propeller hub is determined by using

bearing blue color transfer

8529: The spark is produced in a magneto ignition system when the breaker points are

beginning to open

8747: Where physical seperation of the fuel lines from electrical wiring or conduit is impracticable, locate the fuel line

below the wiring and clamp the line securely to the airframe structure

The time/current capacities of a circuit breaker or fuse must be

below those of the associated conductor.

One of the things a metering orifice in a main air bleed helps to accomplish (at a given altitude) in a carburetor is

better fuel vaporization and control of fuel discharge, especially at lower engine speeds.

The throttle valve of float-type aircraft carburetors is located

between the venturi and the engine.

8945: Which of the following statements about constant-speed counterweight propellers is also true when referring to two-position counterweight propeller

blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal

8907: What will happen to the propeller blade angle and the engine RPM if the tension on the propeller governor control spring (speeder spring) is increased

blade angle will decrease and RPM will increase

8929: Which of the following is identified as the cambered or curved side of a propeller blade, corresponding to the upper surface of a wing airfoil section

blade back

8739: When an electric primer is used, fuel pressure is built up by the

booster pump

(1) The mixture used at rated power in air cooled reciprocating engines is richer than the mixture used through the normal cruising range. (2) The mixture used at idle in air cooled reciprocation engines is richer than the mixture used at rated power. Regarding the above statements,

both No. 1 and No. 2 are true

8828: (1) Some aircraft exhaust systems include an augmenter system to draw additional air over the engine for cooling

both No. 1 and No. 2 are true

8904: During the on-speed condition of a propeller, the

centrifugal force of the governor flyweights is equal to the speeder spring force

(1) Airworthiness Directives are Federal Aviation Regulations and must be complied with unless specific exemption is granted. (2) Airworthiness Directives of an emergency nature may require immediate compliance upon receipt. Regarding the above statements,

both No.1 and No.@ are true.

(1)Alternators are rated in volt-amps, which is a measure of the apparent power being produced by the generator. (2)Alternating current has the advantage over direct current in that its voltage and current can easily be stepped up or down

both are true

(1)Electrical circuit protection devices are rated based amount of current that can be carried without overheating the wiring insulation.(2)A trip free circuit breakers makes it impossible to manually hold the circuit closed when excessive current is flowing.

both are true

(1)Fuel may be used to cool oil in gas turbine engines. (2)Ram air may be used to oil in gas turbine engines.

both are true

8940: During operational check of an aircraft using hydromatic full-feathering propellers, the following observations are made: The feather button, after being pushed, remains depressed until the feather cycle is complete, then opens. When unfeathering, it is necessary to manually hold the button down until unfeathering is accomplished

both feather cycle and unfeather cycle are functioning properly

(1)In a turbine engine axial-flow compressor, each consecutive pair of rotor and stator blades constitutes a pressure stage. (2)In a turbine engine axial-flow compressor, the number of rows of stages is determined by the amount of air and total pressure rise required. Regarding the above statements,

both no.1 and no.2 are true.

8852: What type of nuts are used to hold an exhaust system to the cylinders

brass or heat-resistant nuts

Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence by

bridging the gap between the detector center electrode and the ground electrode.

Indentations of bearing races caused by high static loads are known as

brinelling.

8526: A defective primary capacitor in a magneto is indicated by

burned and pitted breaker points

Detonation occurs when the fuel/air mixture

burns too fast.

How are the rotor windings of an aircraft alternator usually excited?

by a variable direct current.

8907-1: How does the propeller overspeed governor on a turboprop engine decrease propeller RPM

by allowing oil to escape from the propeller hub thus driving the blades to a increased blade angle

8882: How is anti-icing fluid ejected from the slinger ring on a propeller

by centrifugal force

8908: How is the speed of a constant-speed propeller changed in flight

by changing the load tension against the flyweights in the governor

8856: How should ceramic-coated exhaust components be cleaned

by degreasing

8859: How do the turbines which are driven by the exhaust gases of a turbo-compound engine contribute to total engine power output

by driving the crankshaft through suitable couplings

8916: How can a steel propeller hub be tested for cracks

by magnetic particle inspection

How are the piston pins of most aircraft engines lubricated?

by oil which is sprayed or thrown by the master or connecting rods.

8865: How are combustion liner walls cooled in a gas turbine engine

by secondary air flowing through the combustion chamber

8881: How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly

by slip rings and brushes

How are the teeth of the gears in the accessory section of an engine normally lubricated?

by splashed or sprayed oil.

8912: How is a propeller controlled in a large aircraft with a turboprop installation

by the engine power lever

If a full-flow oil filter is used on an aircraft engine, and the filter becomes completely clogged, the

bypass valve will open and the oil pump will supply unfiltered oil to the engine.

8597: The type of ignition system used on most turbine aircraft engines is

capacitor discharge

8832: The greatest portion of heat generated by combustion in a typical aircraft reciprocating engine is

carried out with exhaust gases

In a supervisory EEC system, any fault in the EEC that adversely affects engine operation

causes an immediate reversion to control by the hydromechanical fuel control unit.

8910: What operational force causes the greatest stress on a propeller

centrifugal force

8936: Which of the following forces or combination of forces operates to move the blades of a constant-speed counterweight-type propeller to the HIGH-PITCH position

centrifugal force acting on the counterweights

8951: The primary purpose of a propeller is to

change engine horsepower to thrust

If the RPM of an axial-flow compressor remains constant, the angle of attack of the rotor blades can be changed by

changing the velocity of the airflow.

Which type valve prevents oil from entering the main accessory case when the engine is not running?

check.

What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?

chemical stability.

8933: Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the

chord of the blade

8955: Propeller blade angle is the angle between the

chord of the blade and the rotational plane of the propeller

8811: On small aircraft engines, fuel vaporization may be increased by

circulating the fuel and air mixture through passages in the oil sump

8822: The position of the cowl flaps during normal cruise flight conditions is

closed

9003: When necessary, APU engine cooling before shutdown may be accomplished by

closing the bleed air valve

8984: Which of the following methods is used to straighten a bent aluminum propeller blade that is within repairable limits

cold straightening only

The primary source of oil contamination in a normally operating reciprocating engine is

combustion deposits due to combustion chamber blow by and oil migration on cylinder walls.

8742: The purpose of the diaphragm in most vane-type fuel pumps is to

compensate fuel pressures to altitude changes

8906: What action takes place when the cockpit control lever for a hydromatic, constant-speed propeller is actuated

compression of the speeder spring is changed

If a turbine engine is unable to reach takeoff EPR before its EGT limit is reached, this is an indication that the

compressor may be contaminated or damaged.

A turbine engine dry sump lubrication system of the self-contained, high pressure design

consists of pressure, breather, and scavenge subsystems.

The generating system of an aircraft charges the battery by using

constant voltage and varying current.

When does current flow through the coil of a solenoid-operated electrical switch?

continually, as long as the control circuit is complete.

8821: How do cowl flaps aid in cooling a horizontally opposed aircraft engine

controls the amount of air flowing around the cylinders

The stator vanes in an axial-flow compressor

convert velocity energy into pressure energy.

What is the primary purpose of the oil-to-fuel heat exchanger?

cool the oil.

8816: Aircraft reciprocating engine cylinder baffles and deflectors should be repaired as required to prevent loss of

cooling

8898: Propeller aerodynamic (thrust) imbalance can bes largely eliminated by

correct blade contouring and angle setting

8846: Why is high nickel chromium steel used in many exhaust system

corrosion resistance and low expansion coefficient

8849: The hot section of a turbine engine is particularly susceptible to which of the following kind of damage

cracking

8941: Inspection of propeller blades by dye-penetrant inspection is accomplished to detect

cracks or other defects

Continued and/or excessive heat and centrifugal force on turbine engine rotor blades is likely to cause

creep.

8820: Where are cooling fins usually located on air-cooled engines

cylinder head, cylinder barrel, and inside the piston

8845: Increased engine heat will cause volumetric efficiency to

decrease

One purpose of an air bleed in a float-type carburetor is to

decrease fuel density and destroy surface tension.

During engine operation, if carburetor heat is applied, it will

decrease the air density to the carburetor.

The compressor stators in a gas turbine engine act as diffusers to

decrease the velocity of the gas flow.

8805: The application of carburetor heat during engine operation will

decrease the weight of the fuel/air charge

8886: Ice formation on propellers, when an aircraft is in flight, will

decrease thrust and causes excessive vibration

An indication that the optimum idle mixture has been obtained occurs when the mixture control is moved to IDLE CUTOFF and manifold pressure

decreases and RPM increases momentarily before the engine ceases to fire.

Stator blades in the compressor section of an axial-flow turbine engine

decreases the air velocity and prevent swirling.

The pressure of subsonic air as it flows through a convergent nozzle

decreases.

The pressure of supersonic air as it flows through a divergent nozzle

decreases.

the pressure of supersonic air as it flows through a divergent nozzle

decreases.

86219: The purpose of an under current relay in a starter-generator system is to

disconnect power from the starter-generator and ignition when sufficient engine speed is reached

8851: Sodium-filled valves are advantageous to an aviation engine because they

dissipate heat well

Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of

distilled water at a specific temperature.

8561: Igniter plugs used in turbine engines are subjected to high intensity spark discharges and yet they have a long service life because they

do not require continuous operation

A turbine engine compressor which contains vanes on both sides of the impeller is a

double entry centrifugal compressor.

In turbine engines that utilize a pressurization and dump valve, the dump portion of the valve

drains the engine manifold lines to prevent fuel boiling and subsequent deposits in the lines as a result of residual engine heat (at engine shutdown).

8631: A safety feature usually employed in pneumatic starters that is used if the clutch does not release from the engine drive at the proper time during start is the

drive shaft shear point

The turbine section of a jet engine

drives the compressor section.

One way that the automatic ignition relight systems are activated on gas turbine engines is by a

drop in a compressor discharge pressure.

8507: Magneto breaker point opening relative to the position of the rotating magnet and distributor rotor (internal timing) can be set most accurately

during assembly of the magneto before installation on the engine

Lube system last chance filters in turbine engines are usually cleaned

during overhaul.

8920: The actual distance a propeller moves forward through the air during one revolution is known as the

effective pitch

8954: Geometric pitch of a propeller is defined as the

effective pitch plus slippage

8616: (Refer to Figure 5) The type of system depicted is capable of operating with

either battery or external power

8970: How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full-feathered position

electric cutout pressure switch

8563: Spark plugs are considered worn out when the

electrodes have worn away to about one-half of their original dimensions

8985: It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to

eliminate stress concentration points

8965: The primary purpose of a feathering propeller is to

eliminate the drag created by a windmilling propeller when an engine fails in flight

Anti-icing of jet engine air inlets is commonly accomplished by

engine bleed air ducted through the critical areas.

8818: Which of the following should a mechanic consult to determine the maximum amount of cylinder cooling fin that could be removed when cracks are found

engine manufacturer's service or overhaul manual

In which of the following situations will the oil cooler automatic bypass valve to be open the greatest amount?

engine oil below normal operating temperature.

8562: The electrical circuit from the spark plug back to the magneto is completed by grounding through the

engine structure

If the idling jet becomes clogged in a float-type carburetor, the

engine will not idle.

8599: If the ground wire of a magneto is disconnected at the ignition switch, the result will be the

engine will not stop running when the ignition switch is turned off

An oil separator is generally associated with which of the following?

engine-driven vacuum pump.

8757: A fuel pressure relief valve is required on

engine-driven vane-type fuel pumps

The active clearance control (ACC) portion of an EEC system aids turbine engine efficiency by

ensuring turbine blade to engine case clearances are kept to a minimum by controlling case temperatures.

The recurrent ingestion of dust or other fine airborne particulates into a turbine engine can result in

erosion damage to the compressor and turbine sections.

8866: Augmenter tubes are part of which reciprocating engine system

exhaust

8848: One source commonly used for carburetor air heat is

exhaust gases

8830: What part of an air-cooled cylinder assembly has the greatest fin area per square inch

exhaust valve port

Turbine blades are generally more susceptible to operating damage than compressor blades because of

exposure to high temperatures.

Oil accumulation in the cylinders of an inverted in-line engine and in the lower cylinders of a radial engine is normally reduced for prevented by

extended cylinder skirts.

8520: In an aircraft ignition system, one of the functions of the capacitor is to

facilitate a more rapid collapse of the magnetic field in the primary coil.

When starting a turbine engine, a hung start is indicated if the engine

fails to reach idle RPM.

An aircraft should be facing into the wind when trimming an engine. However, if the velocity of the wind blowing into the intake is excessive, it is likely to cause a

false high compression and turbine discharge pressure, and a subsequent low trim.

8994: The primary reason for careful inspection and prompt repairing of minor surface defects such as scratches, nicks, gouges, ect. On aluminum alloy propellers is to prevent

fatigue failure

8590: Ignition check during engine runup indicates excessive RPM drop during operation on the right magneto. The major portion of the RPM loss occurs rapidly after switching to the right magneto position (fast drop). The mostly likely cause is

faulty or fouled spark plugs

8961: Longitudinal (fore and aft) clearance of constant-speed propeller blades or cuffs must be at least 1/2 inch (12.7 mm) between propeller parts and stationary parts of the aircraft. This clearance is with the propeller blades

feathered or in the most critical pitch configuration

8931: The holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller

feathering pump motor

8888: Proper operation of electric deicing boots on individual propeller blades may best be determined by

feeling the sequence of boot heating and have an assistant observe the loadmeter indications

The procedure for removing the accumulation of dirt deposits on compressor blades is called

field cleaning.

8987: Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminum blades, may be repaired by first

filing with a riffle file

8826: The component(s) in a turbine engine that operate(s) at the highest temperatures is/are the

first stage turbine nozzle guide vanes

Breaking loose of small pieces of metal form coated surfaces, usually caused by defective plating or excessive loads is called

flaking.

8827: During an operational check of an electrically powered aircraft engine cowl flap system, the motor fails to operate. Which of the following is the first to be checked

flap actuator motor circuit breaker

If a float-type carburetor leaks fuel when the engine is stopped, a likely cause is that the

float needle valve is worn or otherwise not seated properly.

Why is expansion space required in an engine oil supply tank?

for oil enlargement and collection of foam.

8814: The primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to

force cooling air into close contact with all parts of the cylinders

As the flux density in the field of a dc generator increases and the current flow to the system increases, the

force required to turn the generator increases.

8838: Prolonged idling of an engine will usually result in

foreign material buildup on spark plugs

A drop in oil pressure may be caused by

foreign material under the relief valve.

The maximum number of terminals that my be connected to any one terminal stud in an aircraft electrical system is

four

8967: When running-up an engine and testing a newly installed hydomatic propeller, it is necessary to exercise the propeller by moving the governor control through its entire travel several times to

free the dome of any entrapped air

8915: Propellers exposed to salt spray should be flushed with

fresh water

Fuel is discharged for idling speeds on a float-type carburetor

from the idle discharge nozzle.

8981: In what position is the constant-speed propeller control placed to check the magnetos

full increase, low propeller blade pitch angle

8844: What is the position of the cowl flaps during engine starting and warmup operations under normal conditions

full open at all times

8825: During ground operation of an engine, the cowl flaps should be in what position

fully open

A severe condition of chafing or fretting in which a transfer of metal form one part to another occurs is called

galling.

Severe rubbing of turbine engine compressor blades will usually cause

galling/

As an aid to cold-weather starting, the oil dilution system thins the oil with

gasoline.

If a generator is malfunctioning, its voltage can be reduced to residual by actuating the

generator master switch

8905: What actuates the pilot valve in the governor of a constant-speed propeller

governor flyweights

8896: Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be

greater at high RPM

8953: The centrifugal twisting force acting on a propeller blade is

greater than the aerodynamic twisting force and tends to move the blade to a lower angle

8540: Magneto breaker points must be times to open when the

greatest magnetic field stress exists in the magnetic circuit

8582: In order to turn a magneto off, the primary circuit must be

grounded

The generally acceptable way to obtain accurate on-site temperature prior to performing engine trimming is to

hang a thermometer in the shade of the nose wheel-well until the temperature reading stabilizes.

What effect does high atmospheric humidity have on the operation of a jet engine?

has little or no effect.

Compared to reciprocating engine oils, the types of oils used in turbine engines

have less tendency to produce lacquer or coke.

Alternator (ac generators) that are driven by a constant-speed drive mechanism are used to regulate the alternator to a constant

hertz output.

8974: On aircraft equipped with hydraulically operated constant- speed propellers, all ignition and magneto checking is done with the propeller in which position

high RPM

8875: Engines using cold stream, or both cold and hot stream reversing include

high bypass turbofans

Which of these characteristics is desirable in turbine engine oil?

high flash point.

An advantage of the axial-flow compressor is its

high peak efficiency.

8930: Which of the following best describes the blade movement of a full-feathering, constant-speed propeller that is in the LOW RPM position when the feathering action is begun

high pitch directly to feather position

8625: The primary advantage of pneumatic (air turbine) starters over comparable electric starters for turbine engines is

high power-to-weight ratio

8542: The capacitor-type ignition system is used almost universally on turbine engines primarily because of its high voltage and

high-heat intensity

8958: What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff

high-speed and low-pitch angle

8919: During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be the greatest

high-speed, high-altitude cruising flight

8871: Compared to normally aspirated engines, turbocharged engine exhaust systems operate at

higher temperatures and higher pressures

8857: Which of the following indicates that a combustion chamber of a jet engine is not operating properly

hot spots on the tail cone

8552: Thermocouples are usually inserted or installed on the

hottest cylinder of the engine

8934: Propeller blade station numbers increase from

hub center line to tip

8923: Propeller blade stations are measured from the

hub centerline

Reciprocating engine power will be decreased at all altitudes if the

humidity is increased.

8779: An increase in manifold pressure when carburetor heat is applied indicates

ice was forming in the carburetor

8834: An engine become overheated due to excessive taxiing or improper ground runup. Prior to shutdown, operation must continue until cylinders have cooled, by running engine at

idle RPM

The exhaust section of a turbine engine is designed to

impart a high velocity to the exhaust gases.

Three types of turbine blades are

impulse, reaction, and impulse-reaction.

8944: Where are the high and low pitch stops of a Hamilton Standard constant-speed or two-position counterweight propeller located

in the counterweight assembly

Where are sludge chambers, when used in aircraft engine lubrication systems, usually located?

in the crankshaft throws.

The basic oil pressure relief valve setting for a newly overhauled engine is made

in the overhaul shop.

Lubricated oils with high viscosity index rating are oil

in which the viscosity does not vary much with temperature change.

8768: Excessively rich or lean idle mixtures result in

incomplete combustion

8598: Ignition check during engine runup indicates a slow drop in RPM. This is usually caused by

incorrect ignition timing or valve adjustment

An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to

increase and the velocity to decrease.

In order to stabilize cams, springs, and linkages within the fuel control, manufactures generally recommend that all final turbine engine trim adjustments be made in the

increase direction.

8949: The primary purpose of a cuff on a propeller is to

increase the flow of cooling air to the engine nacelle

8935: The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to

increase the pitch angle

8917: Which of the following functions requires the use of a propeller blade station

measuring blade angle

8812: The action of a carburetor airscoop is to supply air to the carburetor, but it may also

increase the pressure of the incoming air by ram effect

The stator in the turbine section of a gas turbine engine

increase the velocity of the gas flow.

Turbine nozzle diaphragms located on the upstream side of each turbine wheel, are used in the gas turbine engine to

increase the velocity of the heated gases flowing past this point.

8899: A powerplant using a hydraulically controlled constant-speed propeller is operating within the propeller's constant-speed range at a fixed throttle setting. If the tension of the propeller governor control spring (speeder spring) is reduced by movement of the cockpit propeller control, the propeller blade angle will

increase, engine manifold pressure will increase, and engine RPM wil decrease

If the volume of air passing through a carburetor venturi is reduced, the pressure at the venturi throat will

increase.

8523: As an aircraft engine's speed is increased, the voltage induced in the primary coil of the magneto

increases

Which of the following is a function of the fuel-oil exchanger on a turbojet engine?

increases fuel temperature.

The economizer system in a float-type carburetor

increases the fuel/air ratio at high power settings.

The velocity of subsonic air as it flows flows through a convergent nozzle

increases.

The velocity of supersonic air as it flows through a divergent nozzle

increases.

8963: Counterweights on constant-speed propellers are generally used to aid in

increasing blade angle

Aircraft that operated more than one generator connected to a common electrical system must be provided with

individual generator switches that can be operated from the cockpit during flight?

8514: In a high-tension ignition system, the current in the magneto secondary winding is

induced when the primary circuit is interrupted

8740: The fuel pump relief valve directs excess fuel to the

inlet side of the fuel pump

8972: Which of the following statements concerning the installation of a new fixed-pitch wood propeller is true

inspect the bolts for tightness after the first flight and again after the first 25 hours of flying

8629: Air turbine starters are generally designed so that reduction gear distress or damage may be detected by

inspection of a magnetic chip detector

What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?

insufficient lubrication.

Idle cutoff is accomplished on a carburetor equipped with a back-suction mixture control by

introducing low pressure (intake manifold) air into the float chamber.

The desired engine idle speed and mixture setting

is adjusted with engine warmed up and operating.

As a general rule, a small amount of small fuzzy particles or gray metallic paste on a turbine engine magnetic chip detector

is considered to be the result of normal wear.

The pumping capacity of the scavenger pump in a dry sump aircraft engine's lubrication system

is greater than the capacity of the oil supply pump.

The metered fuel pressure (chamber C) in an injection-type carburetor

is held constant throughout the entire engine operating range.

8623: When using an electric starter motor, current usage

is highest at the start of motor rotation

8624: When using an electric starter motor, the current flow through it

is highest at the start of motor rotation

8997: Frequently, an aircraft's auxiliary power unit (APU) generator

is identical to the engine-driven generators

According to the electron theory of the flow of electricity, when a properly functioning dc alternator and voltage regulating system is charging an aircraft's battery, the direction of current flow through the battery

is into the negative terminal and out the positive terminal.

8853: Repair of exhaust system components

is not recommended to be accomplished in the field

8939: The blade angle of a fixed-pitch propeller

is smallest at the tip

The constant current method of charging ni-cad battery

is the method most effective in maintaining cell balance.

8948: An aircraft's propeller system beta range

is used to produce zero or negative thrust

8884: Propeller fluid anit-icing systems generally use which of the following

isopropyl alcohol

8850: What is the purpose of a slip joint in an exhaust collector ring

it aids in alignment and absorbs expansion

8879: Which statement is generally true regarding thrust reverser systems

it is possible to move some aircraft backward on the ground using reverse thrust

What is the purpose of a reverse-current cutout relay?

it opens the main generator circuit whenever the generator voltage drops below the battery voltage.

8993: One of the advantages of inspecting an aluminum propeller utilizing dye-penetrant inspection procedure is that

it shows whether visible lines and other marks are actually cracks rather than scratches

8913: How does the aerodynamic twisting force affect operating propeller blades

it tends to turn the blades to a high blade angle

8571: A spark plug's heat range is the result of

its ability to transfer heat from the firing end of the spark plug to the cylinder head

8589: Spark plug heat range is determined by

its ability to transfer heat to the cylinder head

8585: A spark plug is fouled when

its spark grounds without jumping electrodes

Upon what quality or characteristic of lubricating oil is its viscosity index based?

its tare of change in viscosity with temperature change.

The main oil filters strain the oil at which point in the system?

just as it leaves the pressure pump.

What precaution is usually taken to prevent electrolyte form freezing in a lead acid battery?

keep the battery fully charged.

8760: Kerosene is used as turbine engine fuel because

kerosene has more heat energy per gallon and lubricates fuel system components

8517: Magneto pole shoes are generally made of

laminations of high-grade soft iron

The oil used in reciprocating engines has a relatively high viscosity due to

large clearances and high operating temperatures.

8864: All of the following are recommended markers for reciprocating engine exhaust systems except

lead pencil

8878: The rearward thrust capability of an engine with the thrust reverser system deployed is

less than its forward capability

8794: The purpose of a sonic venturi on a turbocharged engine is to

limit the amount of air that can flow from the turbocharger into the cabin for pressurization

8573: The term "reach" as applied to spark plug design and/or type, indicates the

linear distance from the shell gasket seat to the end of the threads on the shell skirt

8862: Reciprocating engine exhaust systems that have repairs or sloppy weld beards which protrude internally are unacceptable because they cause

local hot spots

8863: Ball joints in reciprocating engine exhaust systems should be

loose enough to permit some movement

8813: A carburetor air pre-heater is not generally used on takeoff unless absolutely necessary because of the

loss of power and possible detonation

8938: Which of the following best describes the blade movement of a feathering propeller that is in the HIGH RPM position when the feathering action is begun

low pitch through high pitch to feather position

The fan rotational speed of a dual axial compressor forward fan engines is the same as the

low-pressure compressor.

Some high-volume turboprop and turbojet engines are equipped with two-spool or split compressors. When these engines are operated at high altitudes, the

low-pressure rotor will increase in speed as the compressor load decreases in the lower density air.

At cruise RPM, some oil will flow through the relief valve of a gear type engine oil pump. This is normal as the relief valve is set at a pressure which is

lower than the pressure capabilities.

8839: The most common method and generally the best conduction of heat from the inside of a cylinder barrel to the cooling air is accomplished

machining fins directly on the outside of the barrel

8591: If new breaker points are installed in a magneto on an engine, it will be necessary to time the

magneto internally and the magneto to the engine

8535: Alignment of the marks provided for internal timing of a magneto indicates that the

magneto is in E-gap position

8578: If a spark plug lead becomes grounded, the

magneto will not be affected

8511: When timing a magneto internally, the alignment of the timing marks indicates that the

magnets are in the E-gap position

If an engine is equipped with a float-type carburetor and the engine runs excessively rich at full throttle, a possible cause of the trouble is a clogged

main air bleed.

8755: Fuel crossfeed systems are used in aircraft to

maintain aircraft stability

8902: When engine power is increased, the constant-speed propeller tries to function so that it will

maintain the RPM, increase the blade angle, and maintain a low angle of attack

8937: The purpose of permanently sealing and partially filling some models of McCauley propeller hubs with dyed oil is to

make the location of cracks readily apparent

Hot spots in the combustion section of a turbojet engine are possible indicators of

malfunctioning fuel nozzles.

8796: The purpose of a bellmouth compressor inlet is to

maximize the aerodynamic efficiency of the inlet

8833: A broken cooling fin on cylinder head

may be filed to smooth contours if damage and/or repair limits are not exceeded

8895: The application of more protective coating on one blade than the other when refinishing a wood propeller

may be necessary to achieve final balancing

8823: Generally, a small crack just started in a cylinder baffle

may be stop drilled

8959: (1) A mechanic certificate with a powerplant rating authorizes the holder to repair deep scars, nicks, and dents on aluminum propeller blades (2) A mechanic certificate with a powerplant rating authorizes the holder to perform minor straightening of steel propeller blades. Regarding the above statements

neither No. 1 nor No. 2 is true

(1)Welding and straightening of turbine engine rotating airfoils does not require special equipment. (2) Welding and straightening of turbine engine rotating airfoils commonly recommended by the manufacturer. Regarding the above statements,

neither No.1 nor No.2 is true.

The basic gas turbine engine is divided into two main sections: the cold section and hot section. (1)The cold section includes the engine inlet, compressor, and turbine sections. (2)The hot section includes the combustor, diffuser, and exhaust sections. Regarding the above statements,

neither No.1 nor No.2 is true.

Under which of the following conditions will the trimming of a turbine engine be most accurate?

no wind and low moisture.

8592: Using a cold spark plug in a high-compression aircraft engine would probably result in

normal operation

After making a welded repair to a pressurized-type turbine engine oil tank, the tank should be pressure checked to

not less than 5 PSI plus the maximum operating pressure of the tank.

Straightening nitrided crankshaft is

not recommended.

The compression ratio of an axial-flow compressor is a function of the

number of compressor stages.

8867: Dislodged internal muffler baffles on a small reciprocating engine may

obstruct the muffler outlet and cause excessive exhaust back pressure

Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by

oil control rings on the pistons.

Where is the oil of a dry dump reciprocating engine exposed to the temperature control valve sensing unit?

oil cooler inlet.

Where is the oil temperature bulb located on a dry sump reciprocating engine?

oil inlet line.

8628: Inspection of pneumatic starters by maintenance technicians usually includes checking the

oil level and magnetic drain plug condition

8962: Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without counterweights increase pitch angle using

oil pressure

What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure?

oil pressure relief valve.

What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure?

oil tank vent.

In a jet engine which uses fuel-oil heat exchanger, the oil temperature is controlled by a thermostatic valve that regulate the flow of

oil through the heat exchanger.

8903: The propeller governor controls the

oil to and from the pitch changing mechanism

What will result if an oil filter becomes completely blocked?

oil will flow at the normal rate through the system.

Hot section inspections for many modern turbine engines are required

on a time or cycle basis.

8613: In the aircraft magneto system, if the P-lead is disconnected, the magneto will be

on regardless of ignition switch position

As a general rule, starter brushes are replaced when they are approximately

one-half their original length.

(1)Electrical wires larger than 10 gauge use uninsulated terminals. (2)Electrical wires smaller than 10 gauge use uninsulated terminals.

only 1 is true

(1)Most modern aircraft use circuit breakers rather than fuses to protect their electrical circuits. (2)FAR Par 23 requires that all electrical circuits incorporate some form of circuit protective device.

only 1 is true

(1)Gas turbine and reciprocating engine oils can be mixed or used interchangeably. (2)Most gas turbine engine oils are synthetic.

only 2 is true.

(1)Wet sump oil systems are most commonly used in gas turbine engines. (2)In most turbine engine oil tanks, a slight pressurization of the tank is desired to ensure a positive flow of oil.

only 2 is true.

8576: (1) The platinum and iridium ground electrodes used on fine wire spark plugs are extremely brittle and can be broken if they are improperly handled or adjusted. (2) When gapping massive-electrode spark plugs, a wire gauge should be inserted between the center and ground electrodes while moving the ground electrode in order to avoid setting the gap too close. Regarding the above statements

only No. 1 is true

8960: (1) During takeoff, propeller thrust (pull) is greatest if the blade angle of attack is low and the engine power setting is high. (2) With the aircraft stationary, propeller thrust is greatest if the blade angle of attack is high and the engine power setting is high. Regarding the above statements

only No. 1 is true

(1) Serviceability limits for turbine baldes are much more stringent than are those for turbine nozzle vanes. (2) A limited number of small nicks and dents can usually be permitted in any area of a turbine blade. Regarding the above statements,

only No. 1 is true.

8541: In reference to a "Shower of Sparks" ignition system, (1) the retard breaker points are designed to keep the affected ignition system operating if the advance breaker points should fail during normal engine operation (after start) (2) the timed opening of the retard breaker points is designed to prevent engine "kickback" during start. Regarding the above statements,

only No. 2 is true

8515: When a "Shower of Sparks" ignition system is activated at an engine start, a spark plug fires

only while both the retard and advance breaker points are open

8522: When the switch is off in a battery ignition system, the primary circuit is

opened

8922: What is the result of moving the throttle on a reciprocating engine when the propeller is in the constant-speed range with the engine developing cruise power

opening the throttle will cause an increase in blade angle

Which of the following factors helps determine the proper grade of oil to use in a particular engine?

operating speeds of bearings.

8909: When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition

overspeed

A typical barrier type aircraft terminal strip is made of

paper-base phenolic compund.

8528: A magneto ignition switch is connected

parallel to the breaker points

8986: Generally, unless otherwise specified by the manufacturer, repairs of nicks, scratches, gouges, etc. on aluminum propeller blades must be made

parallel to the length of the blade

8842: Which of the following results in a decrease in volumetric efficiency

part-throttle operation

To determine the float level in a float-type carburetor, a measurement is usually made from the top of the fuel i the float chamber to the

parting surface of the carburetor.

Why is it necessary to flash the field of the exciter on a brushless alternator?

permanent magnets are installed in the main field poles.

8869: What could be a result of undetected exhaust system leaks in a reciprocating engine powered airplane

pilot/passenger incapacitation caused by carbon monoxide entering the cabin

In order to reduce the possibility of ground shorting the circuits when the connectors are separated for maintenence, the AN and MS electrical connectors should be installed with the

pin section on the ground side of the electrical circuit.

8595: When installing a magneto on an engine, the

piston in the No. 1 cylinder must be prescribed number of degrees before top center on the compression stroke

What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine?

pistons and cylinder walls.

8979: A fixed-pitch wooden propeller that has been properly installed and the attachment bolts properly torqued exceeds the out-of-track allowance by 1/16 inch. The excessive out-of-track condition may be corrected by

placing shims between the inner flange and the propeller

Which of the following bearing types must be continuously lubricated by pressure oil?

plain.

9002: Generally, when maximum APU shaft output power is being used in conjunction with pneumatic power

pneumatic loading will be automatically modulated to maintain a safe EGT

8980: Manually feathering a hydromechanical propeller means to

port governor oil pressure from the cylinder of the propeller

8971: The primary purpose of the front and rear cones for propeller that are installed on splined shafts is to

position the propeller hub on the splined shaft

8800: When an engine with a subsonic divergent type inlet duct is running in place at high speed on the ground, the air pressure within the inlet is

positive

They type of oil pumps most commonly used on turbine engines are classified as

positive displacement.

8758: A rotary-vane pump is best described as a

positive-displacement pump

8772: A method commonly used to prevent carburetor icing is to

preheat the intake air

The Brayton cycle is known as the constant

pressure cycle.

In a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the

pressure pump.

An advantage of the centrifugal-flow compressor is its high

pressure rise per stage.

The valve assemblies of opposed reciprocating engines are lubricated by means of a

pressure system.

In a gas turbine engine, combustion occurs at a constant

pressure.

The function of the altitude compensating, or aneroid valve used with the Teledyne-Continental fuel injection system on many turbocharged engines is to

prevent an overly rich mixture during sudden acceleration.

8762: It is necessary to control acceleration and deceleration rates in turbine engines in order to

prevent blowout or die-out

Compressor field cleaning on turbine engines is performed primarily in order to

prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces.

8802: The purpose of an engine/inlet anti-ice system is primarily to

prevent ice formation in engine and/or inlet areas

8530: Shielding is used on spark plug and ignition wires to

prevent interference with radio reception

The purpose of a relief valve installed in the tank venting system of a turbine oil tank is to

prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet.

Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to

prevent overservicing.

Aircraft copper electrical wire is coated with tin, silver, or nickel in order to

prevent oxidization.

8744: It is desirable that fuel lines have a gentle slope upward or downward and not have sharp curves or sharp rises and/or falls in order to

prevent vapor lock

8596: The spark occurs at the spark plug when the ignition's

primary circuit is broken

8612: The secondary coil of a magneto is grounded through the

primary coil

An aircraft engine equipped with a pressure-type carburetor is started with the

primer while the mixture control is positioned at IDLE CUTOFF.

8883: On most reciprocating multiengine aircraft, automatic propeller synchronization is accomplished through the actuation of the

propeller control levers

8890: Which of the following determines oil and grease specifications for lubrication of propellers

propeller manufacturers

8525: The purpose of a safety gap in a magneto is to

protect the high-voltage winding from damage

Some larger reciprocating engine use a compensating oil pressure relief valve to

provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warms up.

Bonding jumpers should be designed and installed in such a manner that they

provide a low electrical resistance in the ground circuit.

8735: Boost pumps in a fuel system

provide a positive flow to fuel to the engine pump

On a float-type carburetor, the purpose of the economizer valve is to

provide a richer mixture and cooling at maximum power output.

The oil dampened main bearing utilized in some turbine engines is used to

provide an oil film between the outer race and the bearing housing in order to reduce vibration tendencies in the rotor system, and to allow for slight misalignment.

9006: On APU's equipped with a free turbine and load compressor, the primary function of the load compressor is to

provide bleed air for aircraft pneumatic systems

8533: Aircraft magneto housings are usually ventilated in order to

provide cooling and remove corrosive gases produced by normal arcing

8843: The undersides of pistons are frequently finned. The principal reason is to

provide for greater heat transfer to the engine oil

The purpose of directing bleed air to the outer turbine case on some engines is to

provide optimum turbine blade tip clearance by controlling thermal expansion.

What is the primary purpose of the oil breather pressurization system that is used on turbine engines?

provides a proper oil spray pattern from the main bearing oil jets.

Some engine manufacturers of twin spool gas turbine engines identify turbine discharge pressure in their maintenance manuals as

pt7.

An engine lubrication system pressure relief valve is usually located between the

pump and the internal oil system

8539: The amount of voltage generated in any magneto secondary coil is determined by the number of windings and by the

rate of collapse of the magnetic field round the primary coil

8969: What is indicated when the front cone bottoms while installing a propeller

rear cone should be moved forward

The part of a DC alternator power system that prevents reverse flow of current form the battery to the alternator is the

rectifier.

8928: The centrifugal twisting moment of an operating propeller tends to

reduce the pitch angle

A purpose of the shrouds on the turbine blades of an axial-flow engine is to

reduce vibration.

8894: If a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blage(s) must be

reduced to conform with the shortened blade

8793: The differential pressure controller in a turbocharger system

reduces bootstraping during part-throttle operation

The purpose of the back-suction mixture control in a float-type carburetor is to adjust the mixture by

regulating the pressure on the fuel in the float chamber.

8927: The angle-of-attack of a rotating propeller blade is measured between the blade chord or face and which of the following

relative airstream

8759: Fuel pressure produced by the engine-driven fuel pump is adjusted by the

relief valve adjusting screw

In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a

relief valve.

As the generator load is increased (within its rated capacity), the voltage will

remain constant and the amperage output will increase.

8901: During engine operation at speeds lower than those for which the constant speed propeller control can govern in the INCREASE RPM position, the propeller will

remain in the full LOW PITCH position

9001: When in operation, the speed of an APU

remains at or near rated speed regardless of the load condition

In order to maintain a constant oil pressure as the clearances between the moving parts of an engine increase through normal wear, the supply pump output

remains relatively constant (at a given RPM) with less oil being returned to the pump inlet by the relief valve.

8964: When lubricating a Hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may recommend on some models to

remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting

8817: Cracks in cooling fins that do not extend into the cylinder head may be repaired by

removing affected area and contour filing within limits

The viscosity of a liquid a measure of its

resistance to flow

The reason for flashing the field in a generator is to

restore correct polarity and/or residual magnetism to the field poles.

8880: What is the proper operating sequence when using thrust reversers to slow an aircraft after landing

retard thrust levers to ground idle, raise thrust reverser levers as required, and retard thrust reverser levers to ground idle

8887: What unit in the propeller anti-icing system controls the output of the pump

rheostat

An aircraft carburetor is equipped with a mixture control in order to prevent the mixture from becoming too

rich at high altitudes.

If the main air bleed of a float-type carburetor becomes clogged, the engine will run

rich at rated power.

If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the fuel/air mixture will become

richer as either the altitude or temperature increases.

A punctured float in a float-type carburetor will cause the fuel level to

rise, and enrich the mixture

Which two elements make up the axial-flow compressor assembly?

rotor and stator.

8543: In a low tension ignition system, each spark plug requires individual

secondary coil

In a turbine engine with a dual-spool compressor, the low speed compressor

seeks its own best operating speed.

The purpose of a dwell chamber in a turbine engine oil tank is to provide

separation of entrained air form scavenged oil.

When timming a turbine engine, the fuel control is adjusted to

set idle RPM and maximum speed or EPR.

8946: Most engine-propeller combinations have one or more critical ranges within which continuous operation is not permitted. Critical ranges are established to avoid

severe propeller vibration

8983: Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas

shank

8819: A bent cooling fin on an aluminum cylinder head

should be left alone if no crack has formed

Low oil pressure can be detrimental to the internal engine components. However, high oil pressure

should be limited to the engine manufacturer's recommendations.

The blending of blades and vanes in a turbine engine

should be performed parallel to the length of the blade using smooth contours to minimize stress points.

Reduced blade vibration and improved airflow characteristics in gas turbines are brought about by

shrouded turbine rotor blades.

8870: How may reciprocating engine exhaust system leaks be detected

signs of exhaust soot inside cowling and on adjacent components

8808: In addition to causing acccelerated wear, dust or sand ingested by a reciprocating engine may also cause

silicon fouling of spark plugs

The two types of centrifugal compressor impellers are

single entry and double entry.

The fuel level within the float chamber of a properly adjust float-type carburetor will be

slightly lower than the discharge nozzle outlet.

Why is a constant-speed drive used to control the speed of some aircraft engine-driven generators?

so that the frequency of the alternating current output will remain constant.

on-off tow position electrical switches should be installed

so the ON position is reached by a forward or upward motion.

What type of lubricant may be used to aid in pulling electrical wires or cables through conduits?

soapstone talc

8897: Which of the following is used to correct horizontal unbalance of a wood propeller

solder

8560: Great caution should be exercised in handling damaged hermetically sealed turbine engine igniter transformer units because

some contain radioactive material

8572: If staggered ignition timing is used, the

spark plug nearest the exhaust valve will fire first

8574: The numbers appearing on the ignition distributor block indicate the

sparking order of the distributor

8975: Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective

spider-shaft oil seal

Cylinder walls are usually lubricated by

splashed or sprayed oil.

9000: The function of an APU air inlet plenum is to

stabilize the pressure of the air before it enters the compressor

The term commonly used when two or more electrical terminals are installed on a single lug of terminal strip is

stacking

Which of the following aircraft circuits does not contain a fuse/circuit breaker?

starter circuit

When the starter switch to the aircraft gas turbine engine starter-generator is energized and the engine fails to rotate, one of the probable causes would be the

starter solenoid is defective.

8617: (Refer to Figure 5) If wire No. 8 is broken or disconnected after starter rotation is initiated, and the power lever is advanced

starting sequence will continue normally

8632: A safety feature usually employed in direct-cranking starters that is used to prevent the starter from reaching burst speed is the

stator nozzle design that chokes airflow and stabilizes turbine wheel speed

The non-rotating axial-flow compressor airfoils in an aircraft gas turbine engine, are called

stator vanes.

Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called

stators.

What ype of oil do most engine manufacturers recommend for new reciprocating engine break-in?

straight mineral oil.

The function of the exhaust cone assembly of a turbine engine is to

straighten and collect the exhaust gases into a solid exhaust jet.

In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to

straighten the airflow and eliminate turbulence.

The most effective method of regulating aircraft direct current generator output is to vary, according to the load requirements, the

strength of the stationary field.

The resistance of the current return path through the aircraft is always considered negligible, provided the

structure is adequately bonded.

If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?

surge protection valve.

8809: In an airplane equipped with an alternate air system, if the main air duct air filter becomes blocked or clogged, the

system will automatically allow warm, unfiltered air to be drawn into the engine

8752: A fuel strainer or filter must be located between the

tank outlet and the fuel metering device

8998: Fuel is normally supplied to an APU from

the airplane's main fuel supply

8618: (Refer to Figure 5) When an external power source is connected to the aircraft

the battery cannot be connected to the bus

9004: Usually, most of the load placed on an APU occurs when

the bleed air valve is opened

How is the oil collected by the piston oil ring returned to the crankcase?

through holes drilled in the piston oil ring groove.

8957: What operational force tends to bend the propeller blades forward at the tip

thrust-bending force

8815: What is the purpose of an augmenter used in some reciprocating engine exhaust systems

to aid in cooling the engine

8978: What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades

to allow the moisture which may collect between the tipping and the wood to escape (vent the tipping)

8885: What is a function of the automatic propeller synchronizing system on multiengine aircraft

to control engine RPM and reduce vibration

What is the purpose of the last chance oil filters?

to filter the oil immediately before it enters the main bearings.

8900: Why is the pulley stop screw on a propeller governor adjustable

to limit the maximum engine speed during takeoff

8868: What is the purpose of an exhaust outlet guard on a small reciprocating engine

to prevent dislodged muffler baffles from obstruction the muffler outlet

8925: Why is a constant-speed counterweight propeller normally placed in full HIGH PITCH position before the engine is stopped

to prevent exposure and corrosion of the pitch changing mechanism

8932: What is the primary purpose of the metal tipping which covers the blade tips and extends along the leading edge of each wood propeller blade

to prevent impact damage to the tip and leading edge of the blade

Why is an aircraft reciprocating engine oil tank on a dry sump lubrication system equipped with a vent line?

to prevent pressure buildup in the oil tank.

What is the purpose of the check valve generally used in a dry sump lubrication system?

to prevent the oil from the supply tank from seeping into the crankcase during inoperative periods.

8750: Fuel boost pumps are operated

to provide a positive flow of fuel to the engine

Why are fixed orifice nozzles used in the lubrication system of gas turbine engines?

to provide a relatively constant oil flow to the mian bearings at all engine speeds.

What is the primary prupose of the hopper located in the oil supply tank of some dry sump engine installations?

to reduce the time required to warm the oil to operating temperatures.

What is the function of the stator vane assembly at the discharge end of the typical axial-flow compressor?

to straighten airflow to eliminate turbulence.

8893: What is the purpose of an arbor used in balancing a propeller

to support the propeller on the balance knives

8829: Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder

too much cooling fin area broken off

8995: Which of the following generally renders an aluminum alloy propeller unrepairable

transverse cracks of any size

Dirt particles in the air being introduced into the compressor of a turbine engine will form a coating on all but which of the following?

turbine blades.

The highest heat-to-metal contact in a jet engine is the

turbine inlet guide vanes.

In an axial-flow turbine engine, compressor bleed air is sometimes used to aid in cooling the

turbine, vanes, blades, and bearings.

Generally, the practice when trimming an engine is to

turn all accessory bleed air off.

8876: The purpose of cascade vanes in a thrust reversing system is to

turn to a forward direction the fan and/or hot exhaust gases that have been blocked from exiting through the exhaust nozzle

Each powerplant installed on an airplane with Standard Airworthiness Certificate must have been

type certified.

8793-1: The absolute pressure controller on some small engines is designed to sense oil pressure which flows through the waste gate actuator and then through the controllers on the turbocharger system; the pressure between the turbocharger and the throttle valve is called

upper deck pressure

8860: How should corrosion-resistant steel parts such as exhaust collectors be blast cleaned

use sand which has not previously been used on iron or steel

One of the best ways to increase engine power and control detonation and preignition is to

use water injection.

The air passing through the combustion chamber of a turbine engine is

used to support combustion and to cool the engine.

8754: Fuel lines are kept away from sources of heat, and sharp bends and steep rises are avoided to reduce the possibility of

vapor lock

The back-suction mixture control system operates by

varying the pressure acting on the fuel in the float chamber.

8861: Power recovery turbinnes used on some reciprocating engines are driven by the

velocity of the exhaust gases

The purpose of a bleed valve, located in the beginning states of the compressor, in an aircraft gas turbine engine is to

vent some of the air overboard to prevent a compressor stall.

8892: What type of imbalance will cause a two-blade propeller to have a persistent tendency to come to rest in a horizontal position (with the blades parallel to the ground) while being checked on a propeller balancing beam

vertical

The time in seconds required for exactly 60 cubic centimeters of oil to flow through an accurately calibrated orifice at a specific temperature is recorded as a measurement of the oil's

viscosity.

On a reciprocating engine aircraft using a shrouded exhaust muffler system as a source for cabin heat, the exhaust system should be

visually inspected for any indication of cracks or an operations carbon monoxide detection test should be done.

Electrical switches are rated according to the

voltage and the current they can control.

8992: Surface treatment to counter the effects of dyepenetrant inspection on a propeller is accomplished by

washing off with solvent

Arcing at the brushes and burning of the commutator of a motor may be caused by

weak brush springs.

8565: Sharp bends should be avoided in ignition leads primarily because

weak points may develop in the insulation through which high tension current can leak

8512-2: Magneto timing drift is caused by erosion of the breaker points and

wear of the cam followers

8593: Spark plug fouling caused by lead deposits occurs most often

when cylinder head temperatures are relatively low

Under which of the following conditions is the oil cooler flow control valve open on a reciprocating engine?

when the temperature of the oil returning from the engine is too high.

8505: The E-gap angle is usually defined as the number of degrees between the neutral position of the rotating magnet and the position

where the contact points open

Electrical circuit protection devices are installed primarily to protect the

wiring

8577: Hot spark plugs are generally used in aircraft powerplants

with comparatively low operating temperatures

8855: On an aircraft that utilizes an exhaust heat exchanger as a source of cabin heat, how should the exhaust system be inspected

with the heater air shroud removed