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

Question 0

Which subsystem is not included in the oil system?

Answer 0

Monitoring

Question 1

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

Answer 1

Icing of the aircraft or the engine inlet

Question 2

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

Answer 2

Right

Question 3

What type oil pump is on the TF33 engine?

Answer 3

Two section, single stage, gear driven

Question 4

Which subsystem is not part of the oil indicating system?

Answer 4

Scavenge

Question 5

What happens if the generator frequency becomes unstable?

Answer 5

Accuracy of electronic equipment is affected

Question 6

A generator’s voltage output is roughly proportional to its

Answer 6

revolutions per minute

Question 7

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

Answer 7

3

Question 8

The generator control unit provides system protection and control, and

Answer 8

voltage regulation

Question 9

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

Answer 9

350

Question 10

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

Answer 10

pressure regulating valve

Question 11

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

Answer 11

80

Question 12

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

Answer 12

fuel is bypassing the filter element

Question 13

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?

Answer 13

Main fuel control

Question 14

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

Answer 14

Inlet of the primary main pumping element

Question 15

Metered fuel is supplied to the fuel distributor through the

Answer 15

quick engine change fuel flow transmitter and oil cooler

Question 16

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

Answer 16

opening the drain, shutting off fuel flow to the distributor

Question 17

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

Answer 17

provide clearance between the injector and fuel control

Question 18

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

Answer 18

is diminished

Question 19

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

Answer 19

350

Question 20

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

Answer 20

Shutdown drain system

Question 21

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

Answer 21

the need for maintenance before an engine failure occurs

Question 22

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

Answer 22

computer card

Question 23

All of the options listed below are proper troubleshooting practices except

Answer 23

inspecting other areas after isolating trouble between points

Question 24

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

Answer 24

Troubleshooting charts

Question 25

To become an expert troubleshooter, you must

Answer 25

understand the function of each component within each system

Question 26

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

Answer 26

Pneumatic

Question 27

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

Answer 27

Shutdown or idling

Question 28

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

Answer 28

increases from the front to the back

Question 29

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

Answer 29

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

Question 30

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

Answer 30

First

Question 31

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

Answer 31

fuel gear motor

Question 32

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?

Answer 32

Feedback

Question 33

One type of aerodynamic blockage thrust reverser uses

Answer 33

vanes inside the duct to create swirling gases

Question 34

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

Answer 34

7

Question 35

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

Answer 35

control

Question 36

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

Answer 36

Electronic engine control and fuel control unit

Question 37

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

Answer 37

resistor

Question 38

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

Answer 38

Transmitter

Question 39

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

Answer 39

transmitter and indicator

Question 40

An oil pressure transmitter contains a mechanical section and a

Answer 40

synchronous unit

Question 41

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

Answer 41

Engine accessory section

Question 42

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

Answer 42

TEST

Question 43

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

Answer 43

individual thermocouple inputs or an average of these inputs

Question 44

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

Answer 44

2

Question 45

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

Answer 45

Externally excited

Question 46

During vibration analysis, frequency is usually measured in

Answer 46

cycles per second

Question 47

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

Answer 47

Piezoelectric accelerometer

Question 48

The filter selector switch on the vibration analyzer

Answer 48

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

Question 49

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

Answer 49

Bearings

Question 50

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

Answer 50

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

Question 51

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

Answer 51

Output side of the main oil pump and the vent system

Question 52

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

Answer 52

Dry

Question 53

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

Answer 53

On the aircraft fuselage

Question 54

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

Answer 54

Air inlet modules

Question 55

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

Answer 55

Thrust stand

Question 56

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

Answer 56

Technical orders

Question 57

What is the first step in engine testing?

Answer 57

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

Question 58

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

Answer 58

Fixed and portable

Question 59

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

Answer 59

from a cradle mount

Question 60

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

Answer 60

Ceiling

Question 61

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

Answer 61

support the thrust trailer at a high of 80 inches

Question 62

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

Answer 62

a fuel trailer

Question 63

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

Answer 63

Operable with all known discrepancies corrected

Question 64

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

Answer 64

Engine throttle

Question 65

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

Answer 65

Engine overspeed

Question 66

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

Answer 66

Verify these numbers against the engine data plate

Question 67

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

Answer 67

Deteriorates due to wear

Question 68

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

Answer 68

up, not down to the required limit

Question 69

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

Answer 69

Adjusting the fuel control

Question 70

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

Answer 70

the base air traffic control tower

Question 71

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

Answer 71

Periodic inspection checklists

Question 72

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

Answer 72

Daily

Question 73

Primary job aids that outline minimum inspection requirements are called

Answer 73

inspection work cards

Question 74

Which inspection is a flight preparedness check?

Answer 74

Pre-flight

Question 75

A basic post-flight inspection is completed

Answer 75

after the last flight of the flying period

Question 76

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

Answer 76

Periodic

Question 77

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

Answer 77

Acceptance

Question 78

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

Answer 78

Special

Question 79

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

Answer 79

an incipient

Question 80

Where is a compressor blade most likely to fail?

Answer 80

Near the blade root

Question 81

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

Answer 81

Middle

Question 82

What is the cause of most bearing failures?

Answer 82

Complete loss of lubrication

Question 83

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

Answer 83

inflate aircraft tires

Question 84

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

Answer 84

Vaned deswirl assembly

Question 85

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

Answer 85

Couplings on a common shaft

Question 86

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

Answer 86

Pneumatic thermostat

Question 87

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?

Answer 87

Housing assembly set gear

Question 88

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

Answer 88

Engine speed and pneumatic thermostat (load control) air pressure

Question 89

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?

Answer 89

Oil pressure switch

Question 90

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

Answer 90

Turbine plenum assembly