2A651 Cdc Volume 4

Front 1

Which 54H60–117 propeller subassembly transmits engine torque to the propeller blades?
a. Barrel.
b. Control.
c. Low pitch stop.
d. Pitchlock regulator.

Back 1

a. Barrel.

Front 2

Which 54H60–117 propeller subassembly carries high centrifugal loads created by the
propeller blades?
a. Dome.
b. Barrel.
c. Control.
d. Front spinner.

Back 2

b. Barrel.

Front 3

On the 54H60–117 propeller, which component delivers the actual propeller blade angle
from the blade to the control assembly?
a. Microadjusting ring.
b. Beta feedback shaft.
c. Blade segment gear.
d. Blade bushing.

Back 3

b. Beta feedback shaft.

Front 4

On the 54H60–117 propeller, which pitchlock component mechanically holds the stationary
and rotating pitchlock ratchets apart during reversing and unfeathering operations?
a. Pitchlock control cam.
b. Pitchlock ratchet piston.
c. Externally threaded ring.
d. Externally splined spacer ring.

Back 4

a. Pitchlock control cam.

Front 5

On the 54H60–117 propeller, what component is installed on the blade before the blade butt
is formed during manufacture?
a. Slip rings.
b. Microadjusting ring.
c. Roller thrust bearing.
d. Beveled thrust washer.

Back 5

d. Beveled thrust washer.

Front 6

On the 54H60–117 propeller, which dome assembly part allows the rotating cam to turn
while the stationary cam remains in a fixed position?
a. Roller shaft.
b. Track slopes.
c. Ball bearings.
d. Roller bearings.

Back 6

c. Ball bearings.

Front 7

On the 54H60–117 propeller, which dome assembly component limits cam travel and
prevents the propeller from exceeding feather and reverse blade angles?
a. Rotating pitchlock ratchet.
b. Low pitch stop.
c. Stationary cam.
d. Stop ring.

Back 7

d. Stop ring.

Front 8

On the 54H60–117 propeller, what function is a task of the low pitch stop assembly?
a. Prevents the propeller from going into the beta range when the throttle is positioned in the alpha
range.
b. Limits cam travel and prevents the propeller from exceeding feather and reverse blade angles.
c. Prevents the blades from decreasing pitch if an overspeed condition occurs.
d. Transmits engine torque to the blades.

Back 8

a. Prevents the propeller from going into the beta range when the throttle is positioned in the alpha
range.

Front 9

On the 54H60–117 propeller, which component’s purpose is to provide electrical circuits
between the brush block assembly and the deicing elements of the blade assemblies?
a. Control assembly.
b. Front spinner section.
c. Hub mounting bulkhead.
d. Deicer contact ring holder.

Back 9

d. Deicer contact ring holder.

Front 10

On the 54H60–117 propeller, during normal propeller operation, the output of which pumps
is used?
a. Main pressure and main scavenge.
b. Standby pressure and main scavenge.
c. Auxiliary pressure and main pressure.
d. Auxiliary pressure and auxiliary scavenge.

Back 10

a. Main pressure and main scavenge.

Front 11

On the 54H60–117 propeller, which pump(s) is/are used during propeller static operation?
a. Main pressure.
b. Main scavenge.
c. Standby pressure and main scavenge.
d. Auxiliary pressure and auxiliary scavenge.

Back 11

d. Auxiliary pressure and auxiliary scavenge.

Front 12

On the 54H60–117 propeller, which cam disarms the NTS system linkage when the throttle
is positioned in the beta range?
a. Manual feather.
b. Beta follow-up.
c. Speed set.
d. Beta set.

Back 12

a. Manual feather.

Front 13

On the 54H60–117 propeller, which cam schedules a desired blade angle in the beta range?
a. Beta set.
b. Beta follow-up.
c. Beta shaft rigging.
d. Alpha shaft rigging.

Back 13

a. Beta set.

Front 14

On the 54H60–117 propeller, which valve connects the main, standby, and auxiliary
pressure pumps’ output to the increase pitch lines during negative torque conditions?
a. High pressure relief.
b. Feather actuating.
c. Feather.
d. Pilot.

Back 14

c. Feather.

Front 15

On the 54H60–117 propeller, which valve assists the feather solenoid valve with hydraulic
positioning of the feather and pilot valves?
a. High pressure relief.
b. Feather actuating.
c. Standby.
d. Backup.

Back 15

b. Feather actuating.

Front 16

On the 54H60–117 propeller, what switch, located in the valve housing, is opened by a cam
from 81 to 85 propeller blade angle?
a. Beta indicator.
b. Pressure cutout.
c. NTS.
d. PCBS.

Back 16

d. PCBS.

Front 17

The 54H60–117 propeller governor speeder spring tension positions the pilot valve to
maintain what percent rpm in the beta range?
a. 104 to 108%.
b. 114 to 118%.
c. 99 to 103%.
d. 109 to 113%.

Back 17

d. 109 to 113%.

Front 18

On the 54H60–117 propeller, if the main filter becomes clogged, which valve opens to
assure continued flow?
a. Check.
b. Bypass.
c. Low pressure relief.
d. High pressure relief.

Back 18

b. Bypass.

Front 19

On the 54H60–117 propeller, when the backup valve is opened, the hydraulic pressure
routed to the governor pilot valve is used for which operation?
a. Pitchlock.
b. Standby.
c. Reverse.
d. Airstart.

Back 19

c. Reverse.

Front 20

On the 54H60–117 propeller, which pressure pump is used to feather or unfeather the
propeller during static propeller operation?
a. Main.
b. Backup.
c. Standby.
d. Auxiliary.

Back 20

d. Auxiliary.

Front 21

On the 54H60–117 propeller, which type of valve opens to allow the output of the standby
pump to combine with the output of the main pump?
a. Check.
b. Bypass.
c. Low pressure relief.
d. High pressure relief.

Back 21

a. Check.

Front 22

On the 54H60–117 propeller, when standby pump output is not required, where is it routed?
a. Atmospheric sump.
b. Pressurized sump.
c. Dome assembly.
d. Pilot valve.

Back 22

b. Pressurized sump.

Front 23

What type of force used during pitchlock of the 54H60–117 propeller prevents the blades
from decreasing pitch?
a. Spiral bending.
b. Thrust bending.
c. Centrifugal twisting moment.
d. Aerodynamic twisting moment.

Back 23

c. Centrifugal twisting moment.

Front 24

The purpose of the 54H60–117 propeller pitchlock assembly is to prevent
a. loss of oil pressure.
b. flow of hydraulic fluid to the pilot valve.
c. an engine overspeed due to a loss of power.
d. engine overspeed due to a loss of hydraulic pressure.

Back 24

d. engine overspeed due to a loss of hydraulic pressure.

Front 25

What prevents engagement of the stationary and rotating ratchets on the 54H60–117
propeller when blade angles are below 25° and above 55°?
a. Loss of hydraulic pressure.
b. The pitchlock control cam.
c. An overspeed in excess of 103.5%.
d. Increase- or decrease pitch pressure.

Back 25

b. The pitchlock control cam.

Front 26

What will keep the rotating and stationary ratchets disengaged on the 54H60–117 propeller
when the blade angles are between 25° and 55°?
a. Loss of hydraulic pressure.
b. The pitchlock control cam.
c. An overspeed in excess of 103.5%.
d. Increase- or decrease pitch pressure.

Back 26

d. Increase- or decrease pitch pressure.

Front 27

On the 54H60–117 propeller, what forces the stop levers on the low pitch stop to move
outward?
a. Hydraulic pressure.
b. Movable wedge.
c. Dome piston.
d. Servo valve.

Back 27

b. Movable wedge.

Front 28

When pressure builds to between 240 and 280 psi on the 54H60–117 propeller, which valve
is unseated and allows the stop levers to retract?
a. Servo.
b. Backup.
c. Governor pilot.
d. Low pressure relief.

Back 28

a. Servo.

Front 29

What is coordinated by the throttle in the controllable pitch range?
a. Propeller blade pitch and engine fuel flow.
b. Propeller blade pitch and temperature limiting.
c. Engine fuel flow and constant speed governing.
d. Temperature limiting and constant speed governing.

Back 29

a. Propeller blade pitch and engine fuel flow.

Front 30

Constant speed can only occur when the throttle is positioned from
a. RVS to FLT IDLE.
b. RVS to GND IDLE.
c. GND IDLE to FLT IDLE.
d. FLT IDLE to TAKE OFF.

Back 30

d. FLT IDLE to TAKE OFF.

Front 31

On the 54H60–117 propeller, what is the beta range indication display on the coordinator?
a. 34 to 90 degrees.
b. 18 to 90 degrees.
c. 0 to 34 degrees.
d. 0 to 18 degrees.

Back 31

c. 0 to 34 degrees.

Front 32

On the 54H60–117 propeller, during beta range operation, what moves the pilot valve?
a. Cams and mechanical linkage.
b. Flyweights and speeder spring.
c. Hydraulic pressure.
d. Throttle.

Back 32

a. Cams and mechanical linkage.

Front 33

In the beta range of the 54H60–117 propeller, which cam increases the speeder spring
tension?
a. Beta set.
b. Speed set.
c. Backup valve.
d. Beta follow-up.

Back 33

b. Speed set.

Front 34

During beta range operation on the 54H60–117 propeller, which cam’s rotation moves the
mechanical linkage to center the governor pilot valve?
a. Beta set.
b. Speed set.
c. Backup valve.
d. Beta follow-up.

Back 34

d. Beta follow-up.

Front 35

During alpha range operation on the 54H60–117 propeller, which cam changes speeder
spring tension so the governor pilot valve can maintain 100 percent engine speed?
a. Beta set.
b. Speed set.
c. Backup valve.
d. Beta follow-up.

Back 35

b. Speed set.

Front 36

During an overspeed condition in the alpha range on the 54H60–117 propeller, the
flyweights move the governor pilot valve to meter hydraulic fluid, which will
a. increase blade angle.
b. decrease blade angle.
c. engage the low pitch stop.
d. engage the pitchlock ratchets.

Back 36

a. increase blade angle.

Front 37

Once an overspeed 54H60–117 propeller condition is corrected and the pilot valve is
returned to the center position, what is the result?
a. Hydraulic fluid flow to the dome assembly is increased.
b. Blades are moved to the feather position.
c. Propeller starts to underspeed.
d. System is back on-speed.

Back 37

d. System is back on-speed.

Front 38

During an underspeed condition on the 54H60–117 propeller, what moves the pilot valve?
a. Decreased hydraulic pressure.
b. Increased hydraulic pressure.
c. Speeder spring.
d. Flyweights.

Back 38

c. Speeder spring.

Front 39

When feathering the 54H60–117 propeller, what acts on the mechanical linkage to open the
feather actuating valve?
a. Throttle.
b. Beta shaft.
c. Pilot valve.
d. Manual feather cam.

Back 39

d. Manual feather cam.

Front 40

During 54H60–117 propeller feathering operation, the feather valve is positioned to meter
hydraulic fluid to the
a. aft end of the dome piston.
b. forward end of the dome piston.
c. decrease-pitch side of the pilot valve.
d. increase-pitch side of the pilot valve.

Back 40

b. forward end of the dome piston.

Front 41

Which valve is a backup in case the feather valve fails during feathering operation on the
54H60–117 propeller?
a. Pilot.
b. Feather solenoid.
c. Feather actuating.
d. Standby pump check.

Back 41

a. Pilot.

Front 42

During the 54H60–117 propeller feathering operation, which valve acts as a backup for the
feather actuating valve?
a. Pilot.
b. Feather.
c. Feather solenoid.
d. Standby pump check.

Back 42

c. Feather solenoid.

Front 43

During the 54H60–117 propeller feathering operation, which valve blocks off the standby
pump output and causes hydraulic pressure to increase?
a. Feather.
b. Standby check.
c. Feather solenoid.
d. Feather actuating.

Back 43

d. Feather actuating.

Front 44

During feather operation on the 54H60–117 propeller, what range in pounds per square inch
(psi) of fluid pressure opens the pressure cutout switch contacts?
a. 0 to 200.
b. 300 to 500.
c. 600 to 800.
d. 900 to 1,100.

Back 44

c. 600 to 800.

Front 45

Which component on the 54H60–117 propeller is the primary electrical ground for
energizing the feather override holding coil?
a. Feather relay.
b. Feather solenoid.
c. Pressure cutout switch.
d. Pressure cutout backup switch (PCBS).

Back 45

c. Pressure cutout switch.

Front 46

When attempting to unfeather the 54H60–117 propeller in flight, where must the throttle be
positioned?
a. Any throttle position.
b. Above FLT IDLE.
c. At TAKE OFF.
d. At GND IDLE.

Back 46

b. Above FLT IDLE.

Front 47

Which two cams on the alpha shaft control the 54H60–117 propeller unfeathering
operation?
a. Speed set and beta follow-up.
b. Manual feather and beta set.
c. Speed set and pressure cutout backup switch.
d. Manual feather and pressure cutout backup switch.

Back 47

b. Manual feather and beta set.

Front 48

On the 54H60–117 propeller, what is the minimum psi required to release the feather latches
and allow the piston to move forward?
a. 200.
b. 400.
c. 600.
d. 800.

Back 48

a. 200.

Front 49

On the 54H60–117 propeller, after the NTS system actuator rod positions the mechanical
linkage in the valve housing when a negative torque condition occurs, what component is shifted?
a. Pilot valve.
b. Beta set cam.
c. Speed set cam.
d. Feather actuating valve.

Back 49

d. Feather actuating valve.

Front 50

Besides maintaining the optimum blade phase angle relationship between all propellers,
synchrophasing also
a. keeps the propellers rotating at the same speed.
b. keeps the propellers rotating at different speeds.
c. prevents the pilot valve from shifting to increase blade angle.
d. prevents the pilot valve from shifting to decrease blade angle.

Back 50

a. keeps the propellers rotating at the same speed.

Front 51

Which switch has a spring-loaded guard to hold it in the NORMAL position?
a. Propeller governor control.
b. Synchrophaser disarming.
c. Prop resynchrophase.
d. Synchrophase master.

Back 51

a. Propeller governor control.

Front 52

What rpm in the alpha range are the fuel governing check switches used to reset the
propeller governor?
a. 100%.
b. 102%.
c. 104%.
d. 106%.

Back 52

d. 106%.

Front 53

On the 54H60–91 propeller speed bias motor, what results when the control winding
voltage is different from the reference-winding voltage?
a. Throttle anticipation potentiometer speeds up or slows down the engine.
b. Speed bias motor rotates, and increases or decreases blade angle.
c. Feedback potentiometer recenters the speed bias motor.
d. Speed bias servo control locks the clutch and brake unit.

Back 53

b. Speed bias motor rotates, and increases or decreases blade angle.

Front 54

The master synchrophaser board located in the synchrophaser unit contains a master
channel and a slave channel used by propellers
a. No. 1 and No. 2.
b. No. 2 and No. 3.
c. No. 3 and No. 4.
d. No. 1 through 4.

Back 54

b. No. 2 and No. 3.

Front 55

How much change in rpm does the compensating network in the synchrophaser unit allow
the speed bias motor to correct?
a. 2%.
b. 4%.
c. 6%.
d. 8%.

Back 55

a. 2%.

Front 56

In the mechanical governing mode, what causes the pilot valve to move and set the 54H60–
117 propeller speed?
a. Throttle movement.
b. Speeder spring or flyweights.
c. Beta set cam and beta follow-up cam.
d. Speed set cam and manual feather cam.

Back 56

b. Speeder spring or flyweights.

Front 57

Which propeller governing modes add more functionality to basic mechanical governing
mode?
a. Synchrophasing and beta range.
b. Normal and synchrophasing.
c. Beta and normal range.
d. Alpha and beta range.

Back 57

b. Normal and synchrophasing.

Front 58

For the 54H60–117 propeller to operate in the normal governing mode, the propeller
governor control switch must be placed in the NORMAL position and the throttle must be
a. at or above FLT IDLE and the synchrophase master switch in the ENG 2 or ENG 3 position.
b. at or above FLT IDLE and the synchrophase master switch in the OFF position.
c. below FLT IDLE and the prop resynchrophase switch in RESYNC/INDEX.
d. below FLT IDLE and the fuel governing switch in CHECK.

Back 58

b. at or above FLT IDLE and the synchrophase master switch in the OFF position.

Front 59

When an increase in rpm occurs during engine speed stabilization, how is an overspeed
condition prevented?
a. Decrease speeder spring tension and position the pilot valve to increase blade angle.
b. Increase speeder spring tension and position the pilot valve to decrease blade angle.
c. Decrease flyweight rotation and position the pilot valve to increase blade angle.
d. Increase flyweight rotation and position the pilot valve to decrease blade angle.

Back 59

a. Decrease speeder spring tension and position the pilot valve to increase blade angle.

Front 60

How many slave channels are contained on the master synchrophaser board in the
synchrophaser unit?
a. One.
b. Two.
c. Three.
d. Four.

Back 60

a. One.

Front 61

If the slave propeller blades are in the correct phase angle position during the
synchrophasing governing mode, the resultant phase error voltage is
a. +1.5.
b. +1.
c. 0.
d. –1.

Back 61

c. 0.

Front 62

In the event the R391 Dowty propeller lost hydraulic pressure, the counterweights
installed at the root of each propeller blade would drive the propeller blades toward what
position?
a. Max Reverse.
b. Ground Idle.
c. Take Off.
d. Feather.

Back 62

d. Feather.

Front 63

Which R391 Dowty propeller component routes engine oil to and from the cylinder
and piston?
a. Beta tube.
b. GBE valve.
c. PUAD.
d. GMAD.

Back 63

a. Beta tube.

Front 64

What R391 Dowty propeller assembly part provides an aerodynamic faring over the aft
section of the hub?
a. Backplate.
b. Rear spinner.
c. Front spinner.
d. Afterbody assemblies.

Back 64

a. Backplate.

Front 65

The pneumatic air bled from the small gas turbine engine cannot be used to
a. inflate aircraft tires.
b. remove snow and ice from aircraft surfaces.
c. supply pneumatic power to aircraft pneumatic starters.
d. provide pneumatic power for air-conditioning systems.

Back 65

a. inflate aircraft tires.

Front 66

When used for ground operation, the SGT engine can be installed on
a. pods.
b. an H-frame.
c. a two-wheel trailer.
d. a four-wheel trailer.

Back 66

d. a four-wheel trailer.

Front 67

The “C” in the engine number GTCP 165 indicates that the engine
a. provides electrical power.
b. provides compressed air.
c. is gas powered.
d. is a turbine.

Back 67

b. provides compressed air.

Front 68

The impeller wheel and two turbine wheels in the turbine section of the GTCP 165 engine
are connected by
a. couplings on a common shaft.
b. a gear reduction gearbox.
c. helical splines.
d. tie bolts.

Back 68

a. couplings on a common shaft.

Front 69

On a GTCP 165 engine, the accessory drive section aft housing contains the
a. fuel control unit.
b. oil pump assembly.
c. vane-axial fan assembly.
d. compressor front shaft bearing.

Back 69

d. compressor front shaft bearing.

Front 70

On a GTCP 165 engine, which signals are used by the fuel control unit to control engine
operation?
a. Engine speed and pneumatic thermostat (load control) air pressure.
b. Ambient inlet pressure and turbine exhaust pressure.
c. Engine speed and turbine inlet temperature.
d. Pt0 and Pt7.

Back 70

a. Engine speed and pneumatic thermostat (load control) air pressure.

Front 71

On GTCP 165 engine shutdown, what valve closes to ensure fuel-flow is terminated?
a. Poppet.
b. Scheduling.
c. Fuel flow divider.
d. Fuel shutoff solenoid.

Back 71

d. Fuel shutoff solenoid.

Front 72

What type of sump design is the oil system on a GTCP 165 engine?
a. Wet.
b. Dry.
c. Hot.
d. Cold.

Back 72

a. Wet.

Front 73

On a GTCP 165 engine, which component shuts the engine down if the oil pressure drops
below the safe minimum operating limit?
a. Oil/air cooler.
b. Oil filter assembly.
c. Oil pressure switch.
d. Oil pressure regulator valve.

Back 73

c. Oil pressure switch.

Front 74

On a GTCP 165 engine oil system, air that leaks past various oil seals exits through the
a. vent system.
b. pressure system.
c. scavenge system.
d. auxiliary system.

Back 74

a. vent system.

Front 75

During a normal start on a GTCP 165 engine, the igniter plug continues firing until engine
rotation in rpm reaches
a. 75 percent.
b. 80 percent.
c. 95 percent.
d. 100 percent.

Back 75

c. 95 percent.

Front 76

During normal GTCP 165 engine shutdown, what circuit trips to stop the engine?
a. 100-percent circuit.
b. 110-percent circuit.
c. Load-control circuit.
d. Speed-switch control circuit.

Back 76

b. 110-percent circuit.

Front 77

The modulating and shutoff valve on a GTCP 165 engine will be fully open at what percent
rpm?
a. 60.
b. 70.
c. 80.
d. 90.

Back 77

d. 90.

Front 78

On a GTCP 165 engine, air for the load control system is extracted from the
a. torus.
b. combustor.
c. turbine plenum.
d. compressor deswirl vanes.

Back 78

c. turbine plenum.

Front 79

During load control system operation on a GTCP 165 engine, the pneumatic thermostat is
used to
a. allow for stall-free engine acceleration.
b. prevent engine exhaust over-temperature.
c. measure the compressor exit air temperature.
d. measure the compressor inlet (ambient) air temperature.

Back 79

b. prevent engine exhaust over-temperature.