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CDCs (Test May 3, 2015) > Volume 3 (Engine Systems, Troubleshooting, Operation, Testing, Damage Analysis and Small Gas Turbine) > Flashcards

Volume 3 (Engine Systems, Troubleshooting, Operation, Testing, Damage Analysis and Small Gas Turbine) Flashcards

0
Q

Which subsystem is not included in the oil system?

A

Monitoring

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1
Q

What could be a cause of a compressor stall when there is a reduction or restriction of air at the air inlet?

A

Icing of the aircraft or the engine inlet

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2
Q

On the TF33 engine, where on the intermediate compressor case is the oil tank mounted?

A

Right

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3
Q

What type oil pump is on the TF33 engine?

A

Two section, single stage, gear driven

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4
Q

Which subsystem is not part of the oil indicating system?

A

Scavenge

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5
Q

What happens if the generator frequency becomes unstable?

A

Accuracy of electronic equipment is affected

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6
Q

A generator’s voltage output is roughly proportional to its

A

revolutions per minute

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7
Q

How many electrical phases does a TF33 engine driven generator produce?

A

3

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8
Q

The generator control unit provides system protection and control, and

A

voltage regulation

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9
Q

During the TF34 engine start, all fuel, up to a flow rate of how many pounds per square inch, will bypass the oil cooler?

A

350

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10
Q

The TF34 fuel pump consists of a low and high pressure stage, relief valve, and a

A

pressure regulating valve

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11
Q

How many pounds per square inch does the TF34 fuel pump boost stage increase the fuel inlet pressure?

A

80

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12
Q

When the red warning button is popped out on the fuel filter housing it indicates

A

fuel is bypassing the filter element

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13
Q

The splined coupling engine shaft transmits a signal of the core engine speed (the high pressure compressor and high pressure turbine speeds) to what fuel system component?

A

Main fuel control

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14
Q

Where is the excess metered fuel, from the servo and fuel pump discharge fuel, bypassed back to?

A

Inlet of the primary main pumping element

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15
Q

Metered fuel is supplied to the fuel distributor through the

A

quick engine change fuel flow transmitter and oil cooler

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16
Q

On engine shutdown, as fuel pressure decreases to below 40-60 pounds per square inch, the drain valve in the fuel distributor moves to the left

A

opening the drain, shutting off fuel flow to the distributor

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17
Q

On the TF34-100A engine, injector 13 is configured differently to

A

provide clearance between the injector and fuel control

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18
Q

Under hot fuel conditions at the combustor inlet, the altitude starting capability of the TF34-100A engine

A

is diminished

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19
Q

During start up, all fuel flow up to how many pounds per hour, is forced through the bypass line around the oil cooler?

A

350

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20
Q

Which type of fuel system is used in the TF34-100A engine to prevent spontaneous combustion of residual fuel after engine shutdown?

A

Shutdown drain system

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21
Q

The F108-CF-201 engine monitoring system data that is incorporated as part of the flight data recorder is used to determine

A

the need for maintenance before an engine failure occurs

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22
Q

Data that is recorded for each engine is downloaded and distributed via the

A

computer card

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23
Q

All of the options listed below are proper troubleshooting practices except

A

inspecting other areas after isolating trouble between points

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24
Q

In what format do technical orders present aircraft power plant and engine intermediate maintenance troubleshooting procedures?

A

Troubleshooting charts

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25
Q

To become an expert troubleshooter, you must

A

understand the function of each component within each system

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26
Q

On an F108 engine, which manifold is the anti-ice air supplied from?

A

Pneumatic

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27
Q

On an F108 engine, during which engine operation can the anti-ice valve be manually locked?

A

Shutdown or idling

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28
Q

The inlet duct used on multi engine subsonic aircraft (like the C-5 or C-17) has a diameter that progressively

A

increases from the front to the back

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29
Q

The compressor bleed system reduces the probability of a compressor stall in a dual-rotor engine by

A

reducing the amount of air available to the high-pressure compressor

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30
Q

What stage of the compressor airflow provides the cooling air for the turbine nozzle vanes?

A

First

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31
Q

On an F108-CF-100 engine, the direction of the variable bleed valve rotation is controlled by the

A

fuel gear motor

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32
Q

On an F108-CF-100 engine, which cable relays the variable bleed valve position to the main engine control as the valve approaches the commanded closed position?

A

Feedback

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33
Q

One type of aerodynamic blockage thrust reverser uses

A

vanes inside the duct to create swirling gases

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34
Q

How many core blocker doors are on the F117-PW-100 engine?

A

7

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35
Q

The function of the fuel pump on a F117 is to provide fuel directly to the fuel

A

control

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36
Q

What two components operate together to provide the thrust management system for the F117?

A

Electronic engine control and fuel control unit

37
Q

A typical jet engine exhaust gas temperature indicating system contains thermocouples, thermocouple leads, an indicator, and a

A

resistor

38
Q

What fuel-flow system component of a jet engine operates by using a water wheel concept?

A

Transmitter

39
Q

Two units that work together to indicate the oil system is operating correctly is the oil pressure

A

transmitter and indicator

40
Q

An oil pressure transmitter contains a mechanical section and a

A

synchronous unit

41
Q

Where is the tachometer drive located that operates the high pressure compressor rotor tachometer generator?

A

Engine accessory section

42
Q

What switch is pushed during an operational check of the fire warning system?

A

TEST

43
Q

The test cell exhaust gas temperature (EGT) selector allows selection of

A

individual thermocouple inputs or an average of these inputs

44
Q

Within how many revolutions per minute is the accuracy of the test cell low and high pressure compressor speed indicators?

A

2

45
Q

What type of vibration causes unnecessary engine removals and unwarranted repairs?

A

Externally excited

46
Q

During vibration analysis, frequency is usually measured in

A

cycles per second

47
Q

Which type of vibration transducer is made up of certain ceramic compounds and natural crystals?

A

Piezoelectric accelerometer

48
Q

The filter selector switch on the vibration analyzer

A

allows selection of the necessary filter to remove the natural vibration frequencies of a specific engine

49
Q

What supports the fan and low-pressure turbine of a jet engine?

A

Bearings

50
Q

Written instructions for safe flight-line vehicle operations are found in

A

Air Force Occupational, Safety, and Health Standard 91-100

51
Q

Where are the two pressure gauges connected when conducting a jet engine oil system pressure check?

A

Output side of the main oil pump and the vent system

52
Q

Which monitoring check allows you to start the auxiliary power unit without advancing the jet engine throttle to idle?

A

Dry

53
Q

Where do the primary air silencers, that are designed to reduce the high-frequency turbine whine of a jet engine, fit on an aircraft?

A

On the aircraft fuselage

54
Q

What forms most of the test bay portion sidewalks of a hush house?

A

Air inlet modules

55
Q

What hush house piece of equipment allows for positioning of the removed engine directly in front of the augmentor tube?

A

Thrust stand

56
Q

What establishes the time intervals for visual inspections and periodic maintenance requirements for the hush house?

A

Technical orders

57
Q

What is the first step in engine testing?

A

Determine the type of engine maintenance performed before coming into the test facility

58
Q

What are the two types of engine test cells currently used in the Air Force?

A

Fixed and portable

59
Q

Engines are mounted in the fixed test cell on a thrust stand or are suspended

A

from a cradle mount

60
Q

In the fixed test cell, where does the engine intake air come from?

A

Ceiling

61
Q

On the portable test cell, the swivel pass at the bottom of the leveling jacks on the engine thrust trailer provide for all of the following except

A

support the thrust trailer at a high of 80 inches

62
Q

The noise suppressor on a portable test cell is not equipped with

A

a fuel trailer

63
Q

In what condition should an engine arrive at the engine test cell?

A

Operable with all known discrepancies corrected

64
Q

What must be quickly moved to the “OFF” position should an unsatisfactory engine start occur in the engine test cell?

A

Engine throttle

65
Q

What can an improperly rigged throttle linkage cause during an engine test cell run?

A

Engine overspeed

66
Q

What action should be taken when making engine model and serial number entries on the test cell engine log sheet?

A

Verify these numbers against the engine data plate

67
Q

What happens to jet engine efficiency as the operational hours increase?

A

Deteriorates due to wear

68
Q

When making adjustments to any of the engine systems to bring them to a specification during a test cell run, adjust the device

A

up, not down to the required limit

69
Q

How can the turbine outlet pressure total at station number 7 be varied during an engine test cell trim?

A

Adjusting the fuel control

70
Q

When adjusting the fuel control during an engine test run, you can get the temperature and barometric pressure from equipment at the test cell site or from

A

the base air traffic control tower

71
Q

What item is used with the applicable technical order to inspect a test facility?

A

Periodic inspection checklists

72
Q

How often are service inspections conducted on an engine test cell?

A

Daily

73
Q

Primary job aids that outline minimum inspection requirements are called

A

inspection work cards

74
Q

Which inspection is a flight preparedness check?

A

Pre-flight

75
Q

A basic post-flight inspection is completed

A

after the last flight of the flying period

76
Q

What type inspection is completed on aircraft parts that require infrequent inspections?

A

Periodic

77
Q

What inspection is completed on all newly assigned aircraft and engines?

A

Acceptance

78
Q

Which inspection is conducted by maintenance personnel after an occurrence of a specific or unusual condition?

A

Special

79
Q

A cold compressor stall that occurs at low revolutions per minute and is accomplished by a slight over temperature is called

A

an incipient

80
Q

Where is a compressor blade most likely to fail?

A

Near the blade root

81
Q

Turbine rotor blade failure usually occurs near what part of the blade?

A

Middle

82
Q

What is the cause of most bearing failures?

A

Complete loss of lubrication

83
Q

The pneumatic bleed air from a small gas turbine engine cannot be used to

A

inflate aircraft tires

84
Q

On a gas turbine compressor power unit 165, where is the air compressed by the single-stage centrifugal compressor assembly discharged into?

A

Vaned deswirl assembly

85
Q

How are the impeller wheel and two turbine wheels in the turbine section of the gas turbine compressor power unit 165 engine connected?

A

Couplings on a common shaft

86
Q

What controls the turbine discharge temperature during a loaded condition on a gas turbine compressor power unit 165 engine?

A

Pneumatic thermostat

87
Q

What component provides the shaft drives for the accessories group that is located in the forward housing of a gas turbine compressor power unit 165 engine?

A

Housing assembly set gear

88
Q

Which signals are used by the fuel control unit to control engine operation on a gas turbine compressor power unit 165 engine?

A

Engine speed and pneumatic thermostat (load control) air pressure

89
Q

Which component shuts the engine down if the oil pressure drops below the safe minimum operating limit on a gas turbine compressor power unit 165 engine?

A

Oil pressure switch

90
Q

Where is air for the load control system extracted from on a gas turbine compressor power unit 165 engine?

A

Turbine plenum assembly

CDCs (Test May 3, 2015) (3 decks)

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