Which 54H60–91 propeller subassembly transmits engine torque to the propeller blades?
On the 54H60–91 propeller, which component delivers the actual propeller blade angle from
the blade to the control assembly?
Beta feedback shaft
On the 54H60–91 propeller, which is a function of the pitchlock regulator?
Prevents the blades from decreasing pitch if hydraulic pressure is lost.
On the 54H60–91 propeller, which pitchlock component mechanically holds the stationary
and rotating pitchlock ratchets apart during reversing and unfeathering operations?
Pitchlock control cam.
On the 54H60–91 propeller, which component is used in place of a shim plate on the No. 1 blade?
Beta segment gear.
On the 54H60–91 propeller, which dome assembly part allows the rotating cam to turn while the stationary cam remains in a fixed position?
On the 54H60–91 propeller, what function is a task of the low pitch stop assembly?
Prevents the propeller from going into the beta range when the throttle is positioned in the alpha
On the 54H60–91 propeller, which component provides a means for balancing the propeller?
Hub mounting bulkhead.
On the 54H60–91 propeller, hydraulic fluid is directed from the pump housing to the barrel assembly through what component?
On the 54H60–91 propeller, what is the function of the differential gear train assembly?
Transmits blade angle movement to the valve housing and drives the propeller governor flyweights.
On the 54H60–91 propeller, during normal propeller operation, the output of which pumps
Main pressure and main scavenge.
On the 54H60–91 propeller, which pump assists the main pressure pump when large blade angle movements are required?
On the 54H60–91 propeller, which cam disarms the NTS system linkage when the throttle is positioned in the beta range?
On the 54H60–91 propeller, which valve, contained in the valve housing, controls the flow of hydraulic fluid to and from the dome assembly?
The 54H60–91 propeller governor speeder spring tension positions the pilot valve to
maintain what percent rpm in the beta range?
109 to 113%.
On the 54H60–91 propeller, when the throttle is moved to the GROUND IDLE position, what degree setting does the coordinator pointer indicate on the protractor?
What switch, located in the control quadrant, activates the 54H–60–91 propeller governor
speed bias servo assembly as the throttle is moved into the flight idle gate?
The condition lever GND STOP position is only effective on the ground because the circuits made in this position are completed through what switches?
Landing gear touchdown.
What component in the T56 engine coordinator provides reference signals to the electronic TD amplifier that are proportional to the desired TIT?
On the 54H60–91 propeller, the output of what pump is sufficient to supply hydraulic pressure for normal propeller operation?
On the 54H60–91 propeller, if the main filter becomes clogged, which valve opens to assure
On the 54H60–91 propeller, which valve sets and maintains a pressure differential of about 100 psi between system pressure and the increase- or decrease-pitch pressure?
On the 54H60–91 propeller, when the backup valve is opened, the hydraulic pressure routed to the governor pilot valve is used for which operation?
On the 54H60–91 propeller, which pump is used to feather or unfeather the propeller during
static propeller operation?
On the 54H60–91 propeller, which type of valve opens to allow the output of the standby pump to combine with the output of the main pump?
The purpose of the 54H60–91 propeller pitchlock assembly is to prevent
an engine overspeed due to a loss of hydraulic pressure.
On the 54H60–91 propeller, what prevents engagement of the stationary and rotating ratchets at blade angles below 25° and above 55°?
The pitchlock control cam.
On the 54H60–91 propeller, between the blade angles of 25° and 55°, what will keep the rotating and stationary ratchets disengaged?
Increase- or decrease pitch pressure
On the 54H60–91 propeller, the function of the low pitch stop is to prevent the
dome piston from decreasing blade angle below 23.3° ± .5°.
On the 54H60–91 propeller, what forces the stop levers on the low pitch stop to move outward?
On the 54H60–91 propeller, when pressure builds to between 240 and 280 psi, which valve is unseated and allows the stop levers to retract?
What is coordinated by the throttle in the controllable pitch range?
Blade pitch and engine fuel flow.
On the 54H60–91 propeller, during beta range operation, what moves the pilot valve?
Cams and mechanical linkage.
On the 54H60–91 propeller, during beta range operation, the rotation of which cam moves the mechanical linkage to center the governor pilot valve?
On the 54H60–91 propeller, during alpha range operation, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent rpm?
On the 54H60–91 propeller, during an underspeed condition, what moves the pilot valve?
On the 54H60–91 propeller, when feathering the propeller, what acts on the mechanical linkage to open the feather actuating valve?
manual feather cam
On the 54H60–91 propeller, during feathering operation, the feather valve is positioned to meter hydraulic fluid to the
forward end of the dome piston
On the 54H60–91 propeller, which valve is a backup in case the feather valve fails during feathering operation?
As the 54H60–91 propeller feathers, the output of which pump decreases (drops off)?
On the 54H60–91 propeller, during feather operation, between approximately what psi are
the pressure cutout switch contacts opened?
On the 54H60–91 propeller, which component is the primary electrical ground for energizing the feather override holding coil?
Pressure cutout switch.
When attempting to unfeather the 54H60–91 propeller in flight, where must the throttle be
Above FLT IDLE.
Which two cams, on the alpha shaft, control the 54H60–91 propeller unfeathering operation?
Manual feather and beta set
On the 54H60–91 propeller, what is the minimum psi required to release the feather latches and allow the piston to move forward?
On the 54H60–91 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?
Besides maintaining the optimum blade phase angle relationship between all propellers, what else does synchrophasing do?
Keeps the propellers rotating at the same speed
The fuel governing check switches are used to reset the propeller governor to what percentage of rpm in the alpha range?
Where is the pickup portion of the pulse generator located?
The pulse generator inputs to the synchrophaser unit are used only
when a master propeller is selected.
On the 54H60–91 propeller speed bias motor, when the control winding voltage is different from the reference-winding voltage, what results?
Speed bias motor rotates, and increases or decreases blade angle.
The master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel. These channels are used by which propellers?
No. 2 and No. 3.
Which board in the synchrophaser unit receives input signals that are compared together, modified, and used to control the speed bias motors?
How much change in rpm does the compensating network in the synchrophaser unit allow
the speed bias motor to correct?
On the 54H60–91 propeller, in the mechanical governing mode, what causes the pilot valve to move and set propeller speed?
Speeder spring or flyweights.
Mechanical governing provides the foundation for what other propeller governing modes?
normal and synchrophasing
Which is a function of normal governing?
For the 54H60–91 propeller to operate in the normal governing mode, the propeller governor control switch must be placed in the NORMAL position and what other conditions must
Throttle at or above FLT IDLE, and synchrophase master switch in OFF.
During normal governing operation, what stabilizes the propeller governor during rapid throttle movements?
Throttle anticipation circuit.
To reduce the noise and vibration levels, synchrophasing mode of governing maintains all the propellers at
identical speeds and optimum blade phase angles.
How many slave channels are contained on the master synchrophaser board in the synchrophaser unit?
If the master propeller fails during synchrophaser governing, the slave propellers follow the
about a 2% speed change
Which type of special inspection can be used to find minute cracks on a propeller blade?
When performing a loose blade inspection on the 54H60–91 propeller, fore-and-aft play should not exceed what limit?
When performing the blade tracking inspection on the 54H60–91 propeller, the calculated difference in blade tracks should not exceed what limit?
When you perform a static blade transition check and abnormal noises are detected, the 54H60–91 propeller must be returned to depot. What AFTO form must be documented and accompany the propeller back to depot?
On the 54H60–91 propeller, if a nick is found on the metal portion of the blade when performing a blade inspection, which tool is used to measure the depth of the damage?
Blade checking indicator
The term “No. 320 grit” refers to which feature of sandpaper?
On the 54H60–91 propeller, when performing blade repair if blade damage was due to propeller blade impact, you must remove all traces of the damage, and then, using emery cloth, remove an additional
When the ambient temperature is greater than 65°F and a patch is bonded to the blade fairing, what is the recommended drying time before running the repaired propeller on the aircraft engine?
On the 54H60–91 propeller, when repairing a propeller blade heater, what is the maximum number of wires that can be spliced in any one heater?
On the 54H60–91 propeller, to avoid being crushed after removing the dome shell during dome piston seal replacement, you should keep your fingers away from the
On the 54H60–91 propeller, after the new packings are in place during dome piston seal replacement, you need to turn them so what color faces outward?
During 54H60–91 propeller dynamic balancing, the propeller balance analyzer receive its two inputs from
a velocimeter and the magnetic pulse generator.
To calculate the required weight change when you use the 192A spectrum analyzer, you will need to plot the data on a
balance chart worksheet
When balancing a 54H60–91 propeller, the velocimeter is secured to the forward side of the RGB at what position (as viewed from the rear)?
On the 54H60–91 propeller, propeller balancing is not required if the propeller imbalance is at or below what level?
What R391 Dowty propeller component translates piston and shaft movement to vary propeller blade angle?
Which R391 Dowty propeller component routes engine oil to and from the cylinder and piston?
What R391 Dowty propeller assembly part provides an aerodynamic faring over the aft section of the hub?
Which component controls the R391 Dowty propeller blade angle by directing engine oil flow through the beta tube to the cylinder and piston?
For the R391 Dowty propeller, what component(s) relay propeller blade angle to the FADEC units.
For the R391 Dowty propeller, the feather valve is located inside the
For the R391 Dowty propeller, what component provides blade angle feedback to the FADEC by two RVDT?
For the R391 Dowty propeller, during flight operation, what directs the PCU to meter fine and coarse pitch oil to maintain 1020.7 rpm?
On the R391 Dowty propeller, what does the DITU use to monitor itself for malfunctions?
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.
When used for ground operation, the SGT engine can be installed on
a four-wheel trailer
On an GTCP165 engine, air is compressed by the single-stage centrifugal compressor assembly, and then discharged into
a vaned deswirl assembly.
The impeller wheel and two turbine wheels in the turbine section of the GTCP165 engine
are connected by
a common shaft.
On an GTCP165 engine, turbine discharge temperature is controlled by the
On an GTCP165 engine, the accessory drive section forward housing provides mounts for the components, which include fuel control unit, oil pump assembly, oil filter element, vane-axial fan assembly, and
On a GTCP165 engine, which signals are used by the fuel control unit to control engine
Engine speed and pneumatic thermostat (load control) air pressure.
On GTCP165 engine shutdown, what valve closes to ensure fuel-flow is terminated?
Fuel shutoff solenoid
What type of sump design is the oil system on a GTCP165 engine?
On a GTCP165 engine, which component shuts the engine down if the oil pressure drops below the safe minimum operating limit?
Oil pressure switch
On an GTCP165 engine oil system, air that leaks past various oil seals exits through the
On a GTCP165 engine, the speed switch control does not control the engine during
During normal GTCP165 engine shutdown, what circuit trips to stop the engine?
The modulating and shutoff valve on a GTCP165 engine will be fully open at what percent