Power plant ASA

15. APU

...

9. How can a mechanic determine the state of charge of the HRD bottles of fire extinguishing agent?

A Pressure Gage

9. What kind of inlet duct is often used on turbine-powered helicopters?

A bell-mouthed inlet duct.

7. What is used in a helicopter to increase the amount of cooling air that flows over the engine cylinders?

A belt-driven fan.

5. What are two types of compression checks that can be performed on an aircraft reciprocating engine?

A differential compression check and a direct compression check.

18. Does a series-wound DC motor have a high or a low starting torque?

A high starting torque.

3. What type of actuator is used to control the position of the turbocharger waste gate?

A hydraulic

15. What is used to maintain a constant frequency of the alternating current that is produced by an AC alternator driven by an aircraft turbine engine?

A hydraulic constant-speed drive unit (CSD)

25. With which type of ignition system is a glow plug igniter used?

A low-voltage system.

1. What is the main advantage of a magneto ignition system over a battery ignition system for an aircraft reciprocating engine?

A magneto has its own source of electrical energy

6. What is the minimum separation that is allowed between a wire bundle and a fluid line that carries combustible fluid or oxygen?

A minimum of six inches.

6. What is used to measure the fuel flow of a horizontally opposed, fuel-injected reciprocating engine?

A pressure gage

22. What kind of gage should be used to measure the electrode gap in aircraft spark plugs?

A round wire gage.

17. What keeps a McCauley feathering propeller from feathering when the engine is shutdown on the ground?

A spring-loaded latch mechanism

12. How does the exhaust gas temperature of a reciprocating engine tell anything about the fuel-air mixture being burned by the engine?

A stoichiometric test.

29. What turns on the auto ignition system in a turbo-prop engine?

A torque pressure switch energizes the system

10. How does a torquemeter actually measure the torque produced by an engine?

A torquemeter is measured an oil pressure gage

13. What is meant by a full-floating wrist pin?

A wrist pin that is not clamped in ether piston or the connecting rod.

12. What is adjusted inside the governor for a constant-speed propeller to change the speed at which the propeller is operating?

Adjust the speeder spring.

21.What is meant by trimming a turbojet engine?

Adjusting the fuel control to get the correct idling and maximum-thrust RPM.

2. Where does the alternate air come from that is used with a pressure carburetor or a fuel injection system?

Air around the engine

19.What is the function of the interconnect tubes between the cans of a turbine engine that uses can-type combustors?

Allow the flame to travel around the cans

12. Why do some aircraft fuel filters have a built-in relief valve?

Allow unfiltered fuel to flow to the fuel control device

8. What is the purpose of the ball joints and bellows in the exhaust system of a reciprocating engine?

Allows movements without leaks.

10. What method is used to discharge an HRD bottle in a turbine engine installation?

An electrical Squib

13. What is usually installed in a large reciprocating engine between the turbosupercharger and the carburetor?

An intercooler.

11. What are two reasons Prist is used in turbine engine fuel?

Antifreeze and a biocidal agent

3. Where is the highest temperature located in a turbine engine?

At into the high-pressure turbine.

3. What are two locations water may be injected into a turbine engine?

At the compressor inlet and at the diffuser inlet.

18.At what point in a turbine engine is the temperature the highest?

At the inlet to the HPT (high-pressure turbine).

2.What are the two basic types of compressor that are used in aircraft turbine engine?

Axial-flow and centrifugal

5. Where does an engine-driven fuel pump direct the excess fuel from its pressure relief valve?

Back to the inlet pump.

9.What kind of bearings are used to support the rotor shaft of an aircraft turbine engine?

Ball bearings or roller bearings

OR: What types of bearings are generally found in reciprocating engines.

Ball bearings or roller bearings.

8. What would happen to the fuel-air mixture ratio in a float carburetor if the main air bleed were to become plugged?

Become rich.

6. Does the fuel-air mixture provided by a float carburetor become richer or leaner as the aircraft goes up in altitude?

Become richer

8. What is meant by a divergent inlet duct for a turbine engine?

Becomes greater in the direction the air flows.

7. Does the fuel-air mixture provided by a float carburetor become richer or leaner when carburetor heat is applied?

Becomes richer

12. Where is the piston in a reciprocating engine when the ignition spark occurs?

Before top dead center stroke.

15. How does an engine air inlet vortex destroyer help prevent foreign object damage to the engine?

Blast air sent down to ground.

12. How do some turbine engines prevent ice formation on the inlet guide vanes?

Bleed air from the engine compressor.

7. What is done in most aircraft fuel systems to prevent vapor lock?

Boost pumps are installed

9. What inspection must be performed on an aircraft reciprocating engine if it has been operated on turbine fuel?

Borescope Inspection Check.

13. What kind of mechanism is normally used to measure oil pressure in a reciprocating engine?

Bourdon tube

11. What is used as the rectifier to produce direct current in a DC generator?

Brushes and a commutator.

12. ENGINE

COOLING SYSTEMS

4.What are three types of combustors used on aircraft turbine engines?

Can-type, annular-type, and can-annular-type.

10. What is the danger of operating an aircraft reciprocating engine with too high a carburetor air temperature?

Cause detonation

17. What must be done to reverse the direction of rotation of the armature of a DC electric motor?

Change the polarity.

12. Of what two materials are the thermocouples made that are used in a turbine engine exhaust gas temperature system?

Chromel and alumel.

16.How is the compressor of a turbine engine cleaned?

Clear water, Special Detergent and no Fuel

17. In what position is the carburetor heat control placed when starting an aircraft engine?

Cold position.

17. What type of piston rings are installed on the pistons of an aircraft reciprocating engine?

Compression rings, oil control rings, and oil wiper rings. (Scrapper)

OR: Name the different types of piston rings?

Compression rings, oil control rings, and oil wiper rings. (Scrapper)

17.Where is water injected into a turbine engine for cooling purposes?

Compressor inlet and Diffuser Inlet

3.What is the purpose of the stators in an axial-flow compressor?

Convert velocity energy into pressure energy.

12. What is the function of blast tubes that are installed in a pressure cooling system of a reciprocating engine?

Cooling air to the magnetos and the generator.

9. What is the function of the majority of the air that passes through a turbine engine?

Cooling purposes.

1. Of what material are most reciprocating engine exhaust components made?

Corrosion-resistant steel.

7. What is the most common type of damage that is found in the hot section of a turbine engine?

Cracks

11. What type of damage is normally found in the hot section of a turbine engine?

Cracks caused by heat.

14. How is a pressure-type continuous-element fire detector system checked for operation?

Current is sent through the Thermal Test Unit

3. How is a thermocouple-type fire detection system checked for operation?

Current is sent through the thermal test unit

16. In what position is the mixture control placed for starting an engine that is equipped with a pressure carburetor?

Cutoff position.

6.What is the main purpose of the turbine nozzle in an aircraft turbine engine?

Direct the hot gasses to the turbine wheel.

12. What is indicated if the yellow blow-out plug of the fire extinguisher system on the side of an engine nacelle is blown out?

Discharge by normal operation.

13. What is indicated if the red blow-out plug of the fire extinguisher system on the side of an engine nacelle is blown out?

Discharged by a high temperature condition.

8. What should be done to an aircraft reciprocating engine if it has been operated on turbine engine fuel?

Drain wrong fuel/drain the oil/remove and replace oil and fuel filters/boroscope inspection/compression check/add the right fuel and oil/run up check.

5. What is done to cause a McCauley propeller to feather?

Draining oil out

11. What is checked when a magneto is internally timed?

E-gap position

6. ENGINE

ELECTRICAL SYSTEM

13. ENGINE

EXHAUST SYSTEM

4. What type of the starter is use to the APU?

Electrical

1.What type of device is used on propeller blades to remove ice that has formed on them?

Electrically heated deicer boots.

4. What kind of boost pump is used in most aircraft fuel systems?

Electrically operated centrifugal pumps and vane-type.

21. What engine parameters are sensed by the fuel control unit of a turbine engine?

Engine RPM, inlet air pressure, compressor discharge pressure, burner can pressure and inlet air temperature.

Reciprocating

Engines

8. What happens to the gasoline that is used to dilute the oil in the crankcase of an aircraft reciprocating engine?

Evaporates

15. Would excessive valve clearance cause the valves to open early or late?

Excessive clearance will cause the valve to open late and close early.

19. What causes detonation in an aircraft engine?

Excessive heat and pressure in the engine (Wrong timing and wrong fuel)

21. What could result from incorrectly installed pistons rings?

Excessive oil Consumption

5. Which side of an air-cooled engine cylinder has the greatest amount of cooling fins?

Exhaust area

5. What is used to drive most of the external superchargers used on modern reciprocating engines?

Exhaust gases.

10. ENGINE

FUEL SYSTEMS

20. In which direction relative to the wind should a turbine-powered aircraft be positioned when the fuel control is being trimmed?

Facing the wind below 25 MPH

13. Of what material is the insulation blanket made that is used to protect the aircraft structure from the heat produced by a turbine engine?

Fiberglass

2. On which side of the firewall is the engine fuel shutoff valve located?

Firewall away from the engine.

10. What is meant by a turbofan engine?

First stage of compressor blades are bigger.

1.What determines whether or not a 100-hour inspection is required for an aircraft?

For Business or Flight Instruction

10. Why are both the hot and cold valve clearances given for most radial engines?

For Timing Purposes

11. What is the function of the snap ring inside the hub of a propeller that is mounted on a tapered or splined shaft?

For a properly removal and installation

18. Why are some exhaust valves partially filled with metallic sodium?

For cooling Purposes.

16. What is the purpose of valve overlap?

For cooling purposes

2. What is the purpose of an augmentor tube in the cooling system of an aircraft reciprocating engine?

For cooling purposes.

10. What is the purpose of the small holes that are drilled in the end of a wooden propeller?

For drain purposes

8.Why do some axial-flow turbine engines have more than one set of turbines and compressors?

For more Efficiency performance.

17. Why is it important that a torque wrench always be used when installing spark plugs in an aircraft engine?

For proper installation

18. Why is an aircraft reciprocating engine killed by placing the mixture control in the Cutoff position, rather than by using the magneto switch?

For safety purposes

11. Why do some turbine engines use variable inlet guide vanes?

For the most efficient operation.

8. What is the maximum number of wire terminals that may be stacked on a single stud in a terminal strip?

Four.

1. Where is the heat taken from that is used to heat the induction air in a reciprocating engine?

From a shroud around the exhaust system

3. Where does the manifold pressure gage used on an aircraft reciprocating engine pick up the pressure it measures?

From the Intake manifold

6. Where is the fuel come from to feed the APU?

From the main fuel tank.

4.Of what material are most piston rings made?

Gray cast iron.

4. What is used to protect a wire bundle from chafing where it passes through a hole in a bulkhead or frame?

Grommet

6. What are the two most commonly used fire extinguishing agents used for engine fires?

Halon 1301 and carbon dioxide.

7. What extinguishing agent is used in the high-rate-discharge fire extinguishing systems installed in most turbojet engine installations?

Halon 1301.

8. What is meant by an All Weather spark plug?

Has a weather type seal grommet.

3. What is meant by a dry sump lubrication system?

Has an external oil tank

4. What is meant by a duplex nozzle in a turbine engine fuel metering system?

Have two fuel discharge passages.

4. Does the application of carburetor heat cause the fuel-air mixture to become richer or to become leaner?

Heated air causes the fuel-air mixture to become richer.

4. What is done to cause a Hydromatic propeller to feather?

High engine oil pressure is directed into the governor.

19. What type of ignition system is used on most turbine engines?

High-intensity, intermittent-duty, capacitor discharge ignition systems.

24. What are two types of ignition systems used in turbine engines?

High-voltage systems and low-voltage systems.

11. What are two basic types of fuel controls for aircraft turbine engines?

Hydropneumatic and electro-hydromechanical.

11. ENGINE

INDUCTION SYSTEMS

3. ENGINE

INSPECTION

4. ENGINE

INSTRUMENT SYSTEM

14.What is meant by a hot start in a turbine engine?

Ignition occurs with high EGT.

13.What is meant by a hung start in a turbine engine?

Ignition occurs with not enough engine acceleration

15. What is meant by the alpha range of operation of a turboprop propeller?

In flight mode of operation

14. What is meant by the beta range of operation of a turboprop propeller?

In ground mode of operation.

1.In what units is the tachometer for a reciprocating engine calibrated?

In hundreds of RPM

27. In what position is the magnet in a magneto when the breaker points begin to open?

In its E-gap position

3. Should an adjustable-pitch propeller be in high pitch or in low pitch for takeoff?

In low pitch.

2. In what units is the tachometer for a turbine engine calibrated?

In percent of takeoff RPM

16. In what position should the ignition switch be placed when using a timing light on the magnetos?

In the Both position.

14. In what position should the carburetor heat control be placed when starting a reciprocating engine?

In the Cold position.

3. In what publication can a mechanic find the operating limitations for an aircraft engine?

In the Type Certificate Data Sheets for the engine.

8. When making a magneto check on an engine equipped with a constant-speed propeller, should the propeller control be in the low-pitch or the high-pitch position?

In the low-pitch position.

14. Where is the last chance oil filters located in a turbojet engine?

Inside the engine above each bearings

4. Who is authorized to perform the powerplant inspection that is required for an annual inspection?

Inspection Authorization.

9. What can be done to prevent the front cone from bottoming when installing a propeller on a splined shaft?

Install a spacer

11. How is the structure around a turbine engine protected from excessive heat from the engine?

Insulating blanket.

1. Where does the fuel metering system of a turbine engine discharge its fuel?

Into the combustion chambers.

19. Where is the fuel from a continuous-flow fuel injection system discharged?

Into the cylinder heads near the intake valves.

5. What is the function of a float carburetor?

Is a device that measure the right amount of fuel into the air goes to the engine.

2. What is meant by a wet sump lubrication system?

Is carried inside the engine itself.

2. What is used to prevent ice forming on a propeller blade?

Isopropyl alcohol and ethylene glycol.

9. How does the automatic mixture control in a pressure carburetor keep the fuel-air mixture constant as the aircraft changes altitude?

It automatically and progressively

16. Is the flat surface of a propeller blade the face of the blade or the back of the blade?

It is the face of the blade.

10. Why is it important that a lead pencil never be used to mark on an aircraft exhaust system?

It makes the metal brittle and can crack.

21. What is the function of an impulse coupling?

It produces a hot and late spark.

9. What are the two basic types of turbine engine fuel?

Jet A , A-1 and Jet B

5. Why do most engine oil pressure gages have a restrictor in the line between the engine and the instrument?

Keep the needle from oscillating.

6. What should be done to repair a bent cooling fin in a cast aluminum cylinder head?

Leave it alone

5. What would be the effect on engine performance of an internal failure of a muffler?

Loss of engine power.

9. FUEL

METERING SYSTEMS

3. What kind of connecting rod arrangement is used in a radial engine?

Master Rod

7. What are two types of thrust reversers that are used with turbojet engines?

Mechanical blockage (clamshell) and aerodynamic blockage (cascade).

3. Why are the wires in certain electrical installations twisted together?

Minimize the electromagnetic fields.

2. What is the function of the capacitor in a magneto?

Minimizes arcing at the breaker point

14. What is measured by the tachometers used on a two-spool gas turbine engine?

N1 tachometer and N2 tachometer of RPM.

1. Can a thermal switch-type fire detection system indicate a general overheat condition?

No

2. Can a thermocouple-type fire detection system indicate a general overheat condition?

No

3. Can the APU be accelerated from the pilot cabin?

No

4. Does a break in a continuous-loop fire detection system keep the system from detecting a fire?

No

EXTRA: Are the connecting rods used in each cylinder of a radial engine the same? Explain

No, Radial engines use master and articulating rod assemblies

10. Does the APU need a CSD?

No.

6. What causes a vapor lock in an aircraft fuel system?

Not enough fuel pressure in the system

4. How tight should the clamps be tightened that hold sections of a reciprocating engine exhaust system together?

Not too tight

4. How is oil temperature controlled in an aircraft reciprocating engine?

Oil Sent to the oil cooler

20. What is meant by a hot-tank lubrication system?

Oil cooler is located in the pressure subsytem

21. What is meant by a cold-tank lubrication system?

Oil cooler is located in the scavenge subsystem.

5. The oil temperature shown on the aircraft instrument panel is the temperature of the oil entering the engine or of the oil leaving the engine?

Oil entering the engine.

18. What is meant by a spectrometric oil analysis?

Oil sample is sent to the laboratory to know the internal engine wear condition.

8. On what stroke is the piston of a reciprocating engine when the intake valve begins to open?

On the exhaust stroke.

9. On what stroke is the piston of a reciprocating engine when the exhaust valve begins to open?

On the power stroke

14.

PROPELLERS

5.ENGINE FIRE

PROTECTION SYSTEM

2. Where can you find a list of items that should be inspected on a 100-hour and an annual inspection of an aircraft engine?

Part 43 - Appendix D.

15.What is meant by creep of the turbine blades?

Permanent elongation of the turbine blades

11. What is meant by a cam-ground piston?

Piston is not perfectly round

7. What kind of main bearings are used in a horizontally opposed engine?

Plain or insert bearings.

9. When the APU needs more RPM, When you apply electrical load o pneumatic load?

Pneumatic load.

9. Why do some supersonic aircraft use a convergent-divergent exhaust duct?

Produce thrust at supersonic velocities.

6. What effect on turbine engine operation is caused by a change in the area of the exhaust nozzle?

RPM- EGT-EPR

2. Where is the APU located?

Rear of aircraft

Extra: What purpose do oil control rings serve?

Regulate the thickness of the oil film on the cylinder wall.

11. What two pressures are measured to get the Engine Pressure Ratio of a turbojet engine?

Relation between exhaust pressure and intake pressure.

10. Why must the diaphragms of a pressure carburetor be soaked before the carburetor is ready for flight?

Restores flexibility of the diaphragm

13.What is meant by flashing the field of a DC generator?

Restoring the residual magnetism to the frame of a generator.

7. LUBRICRATION

SYSTEM

8. IGNITION

SYSTEM

11.Where can you find the limits of repair allowed for the compressor blades of an aircraft turbine engine?

Service Manual

12. What is meant by paralleling the generators of a twin-engine aircraft?

Share the electrical load equally.

7. What is indicated if the needle of a ratiometer-type oil temperature indicator pegs to the high side of the dial as soon as the aircraft master switch is turned on?

Short in the system

8. What should be the position of the cowl flaps on a reciprocating engine when it is run on the ground?

Should be wide open on ground.

8. What happens when the pilot pulls the fire-pull T-handle in the cockpit of a jet transport airplane?

Shutt Off: Fuel, Hyd, Pneumatic and Elect System and arm the extinguisher system.

14. What kind of rectifier is used in a DC alternator of the type that is used on most of the modern light airplanes?

Six silicon diodes

2.How many throws are there in the crankshaft of a six-cylinder horizontally opposed engine?

Six.

14. What is the significance of the letters that are stamped on the flats of a fuel injection nozzle?

Size of the orifice in the injector nozzle

7. What is the significance of the color of the solderless connectors that are used on electrical wires?

Size of wire

1. What is APU?

Small turbine engine to provide electrical and pneumatic power to the aircraft.

1. What is the main advantage of a horizontally opposed engine over a radial engine for powering modern aircraft?

Smaller frontal area and is easier to streamline.

1. Why is stranded wire used rather than solid wire in most powerplant electrical systems?

Solid wire is broken when it is subjected to vibration.

14. Why is it important that the spark plugs be kept in numbered holes in a tray when they are removed from an engine?

Spark plugs tell a good deal about the internal condition of the cylinders

3. What is a compensated magneto cam, and on what kind of engine is one used?

Special Cam used in radial engines

1. What is the purpose of the bypass valve in an engine-driven fuel pump?

Starting and for emergency operation.

13. What kind of oil is used in most turbojet engines?

Synthetic oil.

1. What is meant by pressure cooling of an aircraft engine?

The Air is forced to flow through baffles and cylinder fins

11. Why do full-flow oil filters have a spring-operated bypass valve in them?

The bypass valve will open when the oil filter is clogg.

6. At what speed does the camshaft turn, relative to the crankshaft speed in a horizontally opposed engine?

The camshaft turns at one half of the crankshaft speed.

6. What items are checked in a hot section inspection of a turbine engine?

The combustion section is checked for cracks or distorsion. The turbine wheel, the turbine case, and the exhaust section are checked for cracks.

2. What two things must be considered in selection of wire size when making an electrical installation in an aircraft?

The current-carrying capability of the wire and the amount of voltage drop.

22. What is a starter-generator that is used with many of the smaller gas turbine engines?

The engine started and produce electrical current.

20. When removing a battery from an aircraft, which connection should be removed first?

The ground connection must be disconnected first and connected last.

TURBINE 1.What are the two sections of a turbine engine?

The hot section and cold section

2. What is adjusted when the fuel control unit of a turbine engine is trimmed?

The idle speed and the maximum-thrust speed.

28. What malfunction in the ignition system would cause an aircraft reciprocating engine to continue to run after the ignition switch is placed in the Off position?

The ignition switch is not grounding

9. What is meant by the reach of a spark plug?

The length of the threads.

7. What is the basic difference between a low-tension magneto and a high-tension magneto?

The low-tension magneto has transformer on each spark plug wire.

26. How is the strength of the magnet in a magneto checked?

The magneto is put on a test stand and rotated at a specified speed.

20.What are two types of thrust reversers that are used on turbojet engines?

The mechanical blockage-type and the aerodynamic blockage-type.

19. What indication would a pilot have if his oil supply was low?

The oil temperature would be high and the oil pressure would be low.

5. What happens in a magneto ignition system when the ignition switch is placed in the Off position?

The primary circuit is connected to ground.

1. What is meant by the viscosity of engine lubricating oil?

The resistance of the oil to flow.

10. Which pump is the larger in a dry-sump lubricating system, the pressure pump or the scavenger pump?

The scavenger pump

4. What is the significance of the numbers on the distributor of an aircraft magneto?

The sparking order of the magneto

15. Does the tachometer of a geared reciprocating engine indicate the speed of the crank shaft or of the propeller shaft?

The speed of the crankshaft.

19. Which aircraft electrical circuit does not normally contain a fuse or circuit breaker?

The starter motor circuit.

9. What should a thermocouple-type cylinder head temperature indicator read when the engine is not operating?

The temperature of the outside air

11. Which type of fire detection system operates on the rate of temperature rise?

The thermocouple system.

13. What two things are adjusted when adjusting the idling of a reciprocating engine?

The throttle stop and the idle mixture control.

7. What is meant by a free-turbine turbo shaft engine?

The turbine engine that move two separate turbine wheels-one move the compressor - one move the propeller shaft.

21. What is meant by the effective voltage of sine wave alternating current?

The value of the alternating current needed to produce the same amount of heat as the value of direct current.

16. What three things must be synchronized before a three-phase AC generator can be connected to a bus that is being served by another generator?

The voltage, the frequency, and the phase rotation of the generators.

10. What is the difference between a hot spark plug and a cold spark plug?

The way heat is dissipate.

16. What information must be displayed around the oil filler opening for a turbojet engine?

The word "Oil" and specification.

4. What are two types of pickups used for measuring the cylinder head temperature of a reciprocating engine?

Thermocouple and bayonet

8. What type of indicating system is used to measure the exhaust gas temperature of a turbine engine?

Thermocouples

17. What is the function of the oil control rings on the piston of an aircraft reciprocating engine?

They maintain the proper quantity of oil between the piston and the cylinder wall.

9. What is the purpose of the sludge plugs in the crankshaft of a reciprocating engine?

They trap sludge.

3. Where does carburetor ice normally form in a carburetor?

Throat of venturi area and around the throttle valve.

12. What is the purpose of a vernier coupling used on some aircraft magneto drives?

Timing Purposes

15. What is the function of the economizer system in an aircraft engine carburetor?

To economize fuel at cruise speed but not in full power.

13. What is the function of the accumulator that is used with some McCauley feathering propellers?

To hold pressure

20. Why is a compression check important for determining the condition of an aircraft reciprocating engine?

To know the internal engine wear condition.

15. What is the purpose of staggered timing between the two magnetos on an aircraft engine?

To maintain spark in the center of the piston when both magnetos are actuating.

18. Why are pressurized magnetos used on most reciprocating-engine-powered aircraft that fly at high altitudes?

To minimize arcing at high altitude

6. What is the reason for having a low-tension ignition system on some aircraft?

To minimize arcing at high altitude.

5. What is the reason for using hydraulic valve lifters in an aircraft engine?

To minimize valve wear

20. What is the purpose of the metal strep install in the wooden propeller leading edge?

To prevent damage and crush

9. What is the purpose of the shielding that is used to encase some electrical wires?

To prevent electromagnetic distortion to any instrument.

10. Why must a switch be derated if it is used in a circuit controlling a DC electric motor?

To prevent high inrush current.

10. Why do some turbine engine fuel systems incorporate a fuel heater?

To prevent ice forming in the filters.

12.Why is it important that a turbojet engine be allowed to cool before it is shut down after it has been operated at a high power setting?

To prevent seize the rotor

13. What is the advantage of fine-wire spark plugs over massive electrode spark plugs?

To prevent solid lead contamination in the spark plug

14. Why do most aircraft reciprocating engines use more than one spring on each valve?

To prevent surge valve.

8. What is the function of air inlet plenum in the APU?

To stabilize the inlet air pressure.

6. What is the purpose of oil dilution in a reciprocating engine?

To start the engine in extreme cold conditions.

15. Where is the oil tank in a dry-sump reciprocating engine vented?

To the engine crankcase.

7. Do the counterweights on a propeller tend to move the blades toward high pitch or toward low pitch?

Toward high pitch.

6. Does centrifugal twisting moment on a propeller blade tend to move the blades toward high pitch or toward low pitch?

Toward low pitch.

10. How does metallic sodium in an exhaust valve aid in transferring heat?

Transferring the heat to outside.

5.How many igniters are there normally in an aircraft turbine engine?

Two

Extra: What is to help prevent valve surge of floating in an aircraft engine?

Two or more springs are used on each valve.

23. How many igniters are used in most turbine engines?

Two.

5. How are electrical wires protected where they pass through an area of high temperature?

Use a Protective Special Conduit.

7. What is the function of the hopper in the oil tanks used with some reciprocating engines?

Use to dilute oil with less fuel.

18. What cause to the aircraft if ice is on the propeller?

Vibration.

12. What is the function of a fuel-oil heat exchanger in the lubrication system of a turbojet engine?

Warm the fuel to prevent ice forming.

19. What must be done if salt is sprayed on to the propeller?

Wash with fresh water.

2. How is the speed of a turbocharger controlled?

Waste gate

6. What controls the speed of a turbocharger compressor?

Waste gate valve.

7. What is meant by a convergent inlet duct for a turbine engine? Becomes smaller in the direction the air flows.

Waste gate valve.

20. What is meant by the E-gap in magneto timing?

When the breaker point open at specific right angle.

23. When should aircraft wiring be installed in a conduit?

When the wiring passes through rough areas

5. Does the pressure-type continuous-element fire detector system detect a general overheat condition, as well as a fire?

Yes

5. Is APU generator identical as the turbine engine generator?

Yes

7. Can the APU starting in flight?

Yes, depend the type of aircraft.

8. Is the use of a checklist required when performing an annual or 100-hour inspection on an aircraft engine?

Yes.

3. What are three purposes for the boost pumps in an aircraft fuel system?

starting the engine, to prevent vapor lock, and to transfer fuel tank to tank.