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😵‍💫 > POWERPLANT - ENGINE MAINTENANCE AND TROUBLESHOOTING > Flashcards

POWERPLANT - ENGINE MAINTENANCE AND TROUBLESHOOTING Flashcards

1
Q

What is ‘detonation’ in an aircraft engine?

A

Sudden explosion of the fuel-air mixture

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2
Q

Which of the following can cause detonation in a piston engine?

A

Low fuel octane rating

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3
Q

What is the recommended procedure if water is detected in the aircraft fuel system?

A

Drain the system and replace the fuel

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4
Q

How is an aircraft engine typically started?

A

Using a starter motor

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5
Q

What is a typical symptom of carburetor icing?

A

Decrease in engine RPM

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6
Q

What does the term ‘leaning the mixture’ mean?

A

Decreasing the fuel-to-air ratio

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7
Q

What is ‘pre-ignition’ in a piston engine?

A

Early ignition of the fuel-air mixture

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8
Q

What is a typical symptom of a failing magneto in an aircraft engine?

A

Engine misfiring or rough running

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9
Q

What does the term ‘rich mixture’ mean in aircraft engines?

A

High fuel-to-air ratio

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10
Q

What does the term ‘hot start’ refer to in a jet engine?

A

Excessive EGT during startup

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11
Q

In turbine engine maintenance, what is the purpose of a hot section inspection?

A

To inspect and maintain the combustion and turbine sections

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12
Q

What is the most common cause of oil foaming in an aircraft engine?

A

Air leakage into the oil system

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13
Q

Which of the following is a symptom of a partially clogged fuel injector in a reciprocating engine?

A

Rough idle

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14
Q

Which of the following conditions is most likely to cause engine surging in a turbine engine?

A

Inlet distortion

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15
Q

When adjusting the idle speed of a reciprocating engine, the mixture control should be set to:

A

Full Rich

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16
Q

What is the indication of a failed engine bearing?

A

Metallic noise

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17
Q

What is the primary purpose of the dynamic propeller balancing often performed on Lycoming engines?

A

To reduce engine vibration

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18
Q

FAA regulations require which action if a Continental engine’s oil consumption significantly increases?

A

Conduct a thorough inspection to determine the cause

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19
Q

What is the recommended oil type for most Continental engines according to manufacturer specifications?

A

Ashless dispersant oil

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20
Q

During a pre-flight inspection, what should be checked in the fuel system of a Lycoming engine?

A

Fuel quantity and signs of contamination

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21
Q

What common maintenance action is recommended for Continental engines equipped with turbochargers?

A

Periodic cleaning of the wastegate and turbocharger components

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22
Q

For Continental engines, what is the typical cause of an engine not reaching full RPM during takeoff?

A

Incorrect magneto timing

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23
Q

Which of the following is a common indication of a magneto problem in a Continental engine?

A

Engine backfiring

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24
Q

What is the recommended procedure for troubleshooting a rough running Lycoming engine?

A

Check and clean spark plugs

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25
Q

Which component is crucial for ensuring proper oil pressure in a Continental engine?

A

Oil pump

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26
Q

According to FAA, what should be done if a Lycoming engine experiences a propeller strike?

A

Perform a complete engine teardown inspection

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27
Q

What does a significant decrease in manifold pressure indicate in a turbocharged engine?

A

Turbocharger failure

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28
Q

When should engine oil be changed in a reciprocating engine?

A

a. Every 100 flight hours or as recommended by the manufacturer

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29
Q

What could be a result of fuel vapor lock in an aircraft engine?

A

Engine stalling or failure

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30
Q

What could be a consequence of using the wrong grade of oil in an aircraft engine?

A

Engine overheating or excessive wear

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31
Q

Which of the following indicates the need for an immediate oil change in a turbine engine?

A

Presence of metal particles in the oil filter

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32
Q

What is the main reason for regularly draining fuel sumps and filters in aircraft?

A

To remove water and contaminants

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33
Q

What action should be taken if a fuel sample shows contamination?

A

Report and document the contamination

34
Q

Which of the following is a common symptom of fuel contamination in a
reciprocating engine?

A

Rough running engine

35
Q

Which component is checked during a magneto-to-engine timing procedure?

A

Crankshaft position

36
Q

According to regulations, what is required after replacing a propeller governor on a reciprocating engine?

A

Ground run-up test

37
Q

Regulations stipulate that an engine test cell must be used for:

A

Initial run-in of a new or overhauled engine

38
Q

What does a drop in RPM during a magneto check indicate?

A

Faulty magneto or ignition system issue

39
Q

According to FAA, when must an engine be borescoped?

A

As specified by the manufacturer

40
Q

What is the typical cause of high oil pressure in an aircraft engine?

A

Low oil temperature

41
Q

When troubleshooting a low fuel flow indication in a turbine engine, what is the first component to check?

A

Fuel pump

42
Q

What causes ‘carburetor icing’ in a reciprocating engine?

A

The rapid cooling of air as it passes through the carburetor

43
Q

What type of damage is most likely to be found in the compressor section of a jet engine?

A

Foreign object damage (FOD)

44
Q

What does the ‘rich’ position on a mixture control indicate?

A

Maximum fuel-to-air ratio

45
Q

What action should be taken if an engine oil sample shows excessive metal particles?

A

Conduct an immediate engine teardown inspection

46
Q

Which of the following is an indication of a successful engine run-up test?

A

Stable RPM within limits

47
Q

During an engine inspection, what tool is commonly used to measure cylinder head temperatures?

A

Pyrometer

48
Q

What is the typical cause of a rough-running engine during idle in a reciprocating engine?

A

Incorrect idle mixture setting

49
Q

According to FAA regulations, when must an aircraft engine be removed for a major overhaul?

A

After a propeller strike

50
Q

How often should the magneto timing be checked in a reciprocating engine?

A

Every 50 flight hours

51
Q

What is the purpose of a ‘dump valve’ in a fuel system?

A

To empty the fuel lines after shutdown

52
Q

What is the purpose of ‘dynamic balancing’ of a turbine rotor?

A

To minimize vibration

53
Q

What is the function of a ‘fire loop’ in an aircraft engine?

A

To detect over-temperature conditions

54
Q

What is the primary function of a ‘check valve’ in a lubrication system?

A

To allow oil flow in only one direction

55
Q

What does ‘specific fuel consumption’ measure in an aircraft engine?

A

Fuel efficiency

56
Q

What does the ‘lean’ position on a mixture control indicate?

A

Minimum fuel-to-air ratio

57
Q

What is ‘blade creep’ in a turbine engine?

A

The gradual elongation of turbine blades due to high temperatures and
centrifugal forces.

58
Q

What is the primary purpose of an engine performance run after maintenance?

A

To verify that the engine operates within performance limits

59
Q

According to the FAA, how often should a turbine engine undergo a borescope inspection?

A

As specified in the engine’s maintenance manual

60
Q

What is a common cause of high Exhaust Gas Temperature (EGT) in a turbine engine?

A

Excessive fuel flow

61
Q

Engine components suspected of exceeding limits should be:

A

Tagged and sent for detailed inspection

62
Q

What is the primary indication of a failing fuel pump in a reciprocating engine?

A

Low fuel pressure

63
Q

When performing a compression test on an aircraft engine, what is the acceptable minimum pressure difference between cylinders?

A

25 PSI

64
Q

What is the purpose of a magneto timing check on a reciprocating engine?

A

To ensure proper ignition timing

65
Q

Which of the following is a sign of a turbocharger failure in a piston engine?

A

Decreased manifold pressure

66
Q

When troubleshooting a low oil pressure issue in a turbine engine, the first step should be:

A

Check the oil quantity

67
Q

In a dual magneto system, if one magneto fails during flight, the engine will:

A

Run at reduced power

68
Q

What is the likely cause of fluctuating RPM in a piston engine?

A

Fuel contamination

69
Q

When should a turbine engine’s fuel nozzles be cleaned?

A

When engine performance degrades

70
Q

What is the primary purpose of a trend monitoring program for turbine engines?

A

To detect early signs of engine degradation

71
Q

Regulatory bodies mandates that engine mounts must be inspected for:

A

Cracks and corrosion

72
Q

What must be done if an engine exceeds its maximum allowable temperature during operation?

A

Perform an immediate inspection for damage

73
Q

What could be a possible cause of high oil consumption in a reciprocating engine?

A

Worn piston rings

74
Q

In a piston engine, what does a spark plug fouling usually indicate?

A

Rich mixture

75
Q

Regulations state that an engine overhaul must include:

A

Inspection and testing of critical components

76
Q

Which type of maintenance task is considered a major repair under FAA regulations?

A

Replacing an engine mount

77
Q

What type of inspection is typically performed after an aircraft engine overhaul?

A

Post-overhaul inspection

78
Q

What is ‘blade tracking’ in relation to propellers?

A

Ensuring each blade follows the same path

79
Q

What is a counterweight propeller?

A

A propeller with adjustable counterweights for pitch control

80
Q

What is the effect of a propeller slipstream on aircraft performance?

A

Increases airflow over the wings

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