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Powerplant > Turbine Operation + Maintenance > Flashcards

Turbine Operation + Maintenance Flashcards

1
Q

Tachometer is measured in ______.

A

Percent of RPM

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2
Q

The difference between two separate pressure measures in a turbine engine:

A

Engine pressure ratio

EPR

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3
Q

EPR is the ratio of _____ to the ______.

A

Turbine discharge pressure,

Compressor inlet pressure.

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4
Q

2 types of jet engines measured in torque:

A

Turboshaft.

Turboprop.

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5
Q

EGT reading after the normal redline:

A

Transient “Redline”

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6
Q

The two levers on a dual lever turboprop are _____ and _____.

A

Power lever.

Fuel/Condition lever.

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7
Q

The most catastrophic starting issue:

A

Hot Start.

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8
Q

May occurr if fuel is introduced too early in starting process

A

Hot start.

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9
Q

May occurr if starter cuts out too early:

A

Hung start.

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10
Q

Three types of turbine engine throttles systems:

A

1) Full Throttle
2) Flat Rated / Part Throttle
3) De-rated

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11
Q

Explain what is meant by a “full throttle” turbine engine.

A

On a standard day, the full forward position produces the rated HP.

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12
Q

Explain what is meant by a “flat rated” (aka part throttle) turbine engine.

A

Designed for a certain amount of thrust. Advance levers to achieve the desired engine measurements.

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13
Q

Explain what is meant by a “de-rated” turbine engine:

A

Capable of more HP than needed. Power lever is blocked to prevent overworking engine.

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14
Q

Method of turbine engine construction in which the engine is made up of several units that can be removed independent of the rest of the engine:

A

Modular engine construction.

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15
Q

The 4 steps in the “OPERATING CYCLE” of a turbine engine:

A

1) Starting the engine.
2) Taking off.
3) Landing.
4) Shutting the engine down.

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16
Q

A system of routine comparison of engine performance with a base line of the same parameters when the engine was new:

A

Trend Monitoring.

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17
Q

Maintenance program that monitors operating condition of engine and allows repairs to be made when performance deteriorates rather than on a predetermined time schedule:

A

On-condition maintenance

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18
Q

2 types of maintenance programs:

A

1) On-condition maintenance.

2) Trend Monitoring.

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19
Q

A tool used for viewing the inside of a turbine engine without having to disassemble it:

A

Borescope

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20
Q

On a single-shaft turboprop engine, the _______ lever affects the prop angle when on the ground.

A

Power lever.

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21
Q

T/F

On a free-turbine turboprop engine, the power lever increases/decreases airflow.

A

False.

Fuel flow.

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22
Q

When should a hot section inspection be performed?

A

On a time/cycle basis or anytime the EGT becomes excessive.

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23
Q

T/F

Felt tipped markers are approved for marking parts when disassembling the hot section of the engine.

A

True.

No lead, wax, or grease pencils allowed

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24
Q

4 basic rules for systematic troubleshooting:

A

1) Know the way the system should operate.
2) Observe how the system is operating.
3) Divide the system to find the trouble.
4) Look for obvious problem first.

25
Q

A method of repairing damaged compressor and turbine blades with a file:

A

Blending

26
Q

The high velocity stream of turbulent air behind an operating aircraft engine is called the _______.

A

Wake

27
Q

No one should approach within ________ of an inlet duct when engine is operating.

A

25 feet.

28
Q

The hazard area extends around _____ feet behind an idling turbojet and _____ feet behind it when the engine is developing takeoff thrust.

A

100.

200.

29
Q

3 instruments to monitor when starting a turbine engine:

A

1) EGT indicator.
2) Tachometer.
3) Oil pressure gauge.

30
Q

2 criteria used to determine when a turbine engine overhaul is needed:

A

1) Operating hours.

2) Operating cycles.

31
Q

________ normally cause high EGT and unsatisfactory acceleration.

A

Dirty compressor blades.

32
Q

T/F

When blending a compressor or turbine blade, always file perpendicular to the blade edge.

A

False.

Parallel to the blade edge.

33
Q

2 types of liquid washing:

A

1) Desalination washing.

2) Performance-recovery washing.

34
Q

2 ways to clean compressors:

A

1) Grit blasting.

2) Liquid washing.

35
Q

5 parts of the hot section:

A

1) Fuel nozzles.
2) Combustion chambers.
3) Turbine inlet guide vanes.
4) Turbine wheels + blades.
5) Exhaust system.

36
Q

Unless otherwise stated in the service manual, specified torque values are for _____, _____ threads.

A

Clean,

Dry.

37
Q

3 components of the cold section of a turbofan engine:

A

1) Inlet Fan.
2) Compressor.
3) Diffuser.

38
Q

The JetCal Analyzer has these three master instruments:

A

1) EGT.
2) Tachometer.
3) EPR.

39
Q

N1 =

A

Rotational speed of low-pressure compressor.

40
Q

The speed attained by a gas turbine engine during startup that allows it to continue with no further assistance:

A

Self accelerating speed

41
Q

A test run to determine the way an engine’s performance compares with its performance when it was new:

A

Power-assurance check

42
Q

4 sources of data used by the engine manufacturer for purposes of trend monitoring:

A

1) Fuel flow
2) EGT
3) N1
4) N2

43
Q

3 basic routine inspections:

A

1) Pre-flight inspection
2) Cold-section inspection
3) Hot-section inspection

44
Q

Rotating a turbine engine with the starter while the fuel and ignition are turned off is called:

A

Motoring the engine

45
Q

When starting a turbine engine, engage the starter first for what reason?

A

To clear out any remaining fuel vapor from the combustion chamber.

46
Q

Dirty compressor blades normally cause:

A

1) High EGT

2) Unsatisfactory acceleration

47
Q

T/F

Bent compressor blades can be straightened by the mechanic.

A

False.

Should be sent out for major repair

48
Q

T/F

Hot section inspections can usually be performed with the engine on the airframe.

A

True

49
Q

2 critical measurments taken during hot section inspection:

A

1) Clearance between tips of the turbine blades and the housing.
2) Clearance between the turbine wheel and the exhaust cone.

50
Q

Waviness of the leading edge of a turbine blade indicates ______.

A

Overheating

51
Q

______ is cause for an inspection of the fan and compressors.

A

Overspeed

52
Q

_________ is cause for inspection of the hot section.

A

Over-temperature

53
Q

A portable testing instrument that connects to the aircraft instrument system:

A

JetCal analyzer

54
Q

The adjustment of the fuel control to produce the required EGT or EPR at a specified RPM:

A

Engine trimming

55
Q

On a single-shaft turboprop engine, the _______ lever affects the prop pitch while in flight.

A

Condition.

56
Q

A maintenance program that tests the engine oil for the presence of metal particles.

A

Spectrometric Oil Analysis Program.

SOAP

57
Q

The gas generator part of a turbofan, turboprop, or turboprop engine:

A

Core engine

58
Q

3 instrument readings that indicate a proper light up:

A

1) EGT stabilized at correct temp.
2) Oil Pressure indication.
3) Stabilized fuel flow.

Powerplant (19 decks)

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