CDC Volume 4 Edit Code 2

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1/79 Questions

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

About This Quiz

This quiz, titled 'CDC Volume 4 Edit code 2', assesses knowledge on the 54H60-117 propeller system. It focuses on components like the barrel, beta feedback shaft, and pitchlock control, essential for aerospace professionals handling propeller mechanics.

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2.

Which 54H60–117 propeller subassembly carries high centrifugal loads created by the propeller blades?
- Dome.
- Barrel.
- Control.
- Front spinner.
Correct Answer

A. Barrel.

Explanation

The barrel carries high centrifugal loads created by the propeller blades.

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3.

On the 54H60–117 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 range.
- Limits cam travel and prevents the propeller from exceeding feather and reverse blade angles.
- Prevents the blades from decreasing pitch if an overspeed condition occurs.
- Transmits engine torque to the blades.
Correct Answer

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

Explanation

The low pitch stop assembly on the 54H60-117 propeller is responsible for preventing the propeller from going into the beta range when the throttle is positioned in the alpha range. This means that it ensures the propeller remains in the appropriate pitch range based on the throttle position, preventing any unintended movements or adjustments that could affect the propeller's performance.

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4.

On the 54H60–117 propeller, what is the beta range indication display on the coordinator?
- 34 to 90.
- 18 to 90.
- 0 to 34.
- 0 to 18.
Correct Answer

A. 0 to 34.

Explanation

The beta range indication display on the coordinator for the 54H60-117 propeller is 0° to 34°.

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5.

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

A. Auxiliary pressure and auxiliary scavenge.

Explanation

During propeller static operation, the auxiliary pressure pump and the auxiliary scavenge pump are used. These pumps are responsible for providing the necessary pressure and scavenging functions to ensure proper operation of the propeller system. The main pressure and main scavenge pumps are not used during propeller static operation.

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6.

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

A. 109 to 113%.

Explanation

The correct answer is 109 to 113%. The 54H60-117 propeller governor speeder spring tension is responsible for positioning the pilot valve to maintain a specific percentage of RPM in the beta range. In this case, the tension is set to maintain a range of 109 to 113% RPM. This ensures that the propeller operates within the desired speed range during beta operations.

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7.

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

A. Bypass.

Explanation

If the main filter becomes clogged on the 54H60–117 propeller, the bypass valve opens to assure continued flow. This means that the bypass valve allows the fluid to bypass the clogged filter and continue flowing through the system.

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8.

On the 54H60–117 propeller, which pressure pump is used to feather or unfeather the propeller during static propeller operation?
- Main.
- Backup.
- Standby.
- Auxiliary.
Correct Answer

A. Auxiliary.

Explanation

The auxiliary pressure pump is used to feather or unfeather the propeller during static propeller operation on the 54H60-117 propeller.

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9.

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?
- Servo.
- Backup.
- Governor pilot.
- Low pressure relief.
Correct Answer

A. Servo.

Explanation

When the pressure between 240 and 280 psi on the 54H60-117 propeller is reached, the servo valve is unseated. This unseating of the servo valve allows the stop levers to retract.

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10.

Besides maintaining the optimum blade phase angle relationship between all propellers, synchrophasing also
- Keeps the propellers rotating at the same speed.
- Keeps the propellers rotating at different speeds.
- Prevents the pilot valve from shifting to increase blade angle.
- Prevents the pilot valve from shifting to decrease blade angle.
Correct Answer

A. Keeps the propellers rotating at the same speed.

Explanation

Synchrophasing is a technique used to maintain the optimum blade phase angle relationship between all propellers in an aircraft. This means that all the propellers are rotating at the same speed. By keeping the propellers rotating at the same speed, it helps to reduce noise and vibration, improve efficiency, and enhance the overall performance of the aircraft.

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11.

The pneumatic air bled from the small gas turbine engine cannot be used to
- Inflate aircraft tires.
- Remove snow and ice from aircraft surfaces.
- Supply pneumatic power to aircraft pneumatic starters.
- Provide pneumatic power for air-conditioning systems.
Correct Answer

A. Inflate aircraft tires.

Explanation

The pneumatic air bled from the small gas turbine engine cannot be used to inflate aircraft tires because the air bled from the engine is typically at a high temperature and pressure, which is not suitable for inflating tires. Tires require a specific pressure and temperature range for proper inflation, which cannot be achieved with the air bled from the engine.

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12.

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

A. Beveled thrust washer.

Explanation

The beveled thrust washer is installed on the blade before the blade butt is formed during manufacture. This component helps to provide stability and support to the blade, ensuring smooth operation and reducing friction during rotation. Slip rings, microadjusting ring, and roller thrust bearing are not relevant to the installation process of the blade butt.

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13.

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?
- Control assembly.
- Front spinner section.
- Hub mounting bulkhead.
- Deicer contact ring holder.
Correct Answer

A. Deicer contact ring holder.

Explanation

The deicer contact ring holder's purpose is to provide electrical circuits between the brush block assembly and the deicing elements of the blade assemblies. This component ensures that the electrical current is properly transmitted to the deicing elements, allowing them to effectively remove ice from the blades. The other options listed, such as the control assembly, front spinner section, and hub mounting bulkhead, do not have this specific function of providing electrical circuits for deicing.

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14.

On the 54H60–117 propeller, during normal propeller operation, the output of which pumps is used?
- Main pressure and main scavenge.
- Standby pressure and main scavenge.
- Auxiliary pressure and main pressure.
- Auxiliary pressure and auxiliary scavenge.
Correct Answer

A. Main pressure and main scavenge.

Explanation

During normal propeller operation on the 54H60-117 propeller, the output of both the main pressure pump and the main scavenge pump is used. These pumps are responsible for maintaining the necessary pressure and lubrication in the propeller system. The main pressure pump supplies oil to the propeller for hydraulic control, while the main scavenge pump removes excess oil and debris from the propeller system. Using the output of both pumps ensures proper functioning and efficiency of the propeller during operation.

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15.

Constant speed can only occur when the throttle is positioned from
- RVS to FLT IDLE.
- RVS to GND IDLE.
- GND IDLE to FLT IDLE.
- FLT IDLE to TAKE OFF.
Correct Answer

A. FLT IDLE to TAKE OFF.

Explanation

Constant speed can only occur when the throttle is positioned from FLT IDLE to TAKE OFF. This is because FLT IDLE is the lowest throttle position where the engine is running and producing enough power to maintain a constant speed. Moving the throttle from FLT IDLE to TAKE OFF increases the power output of the engine, allowing it to maintain a constant speed. The other options, RVS to FLT IDLE, RVS to GND IDLE, and GND IDLE to FLT IDLE, do not involve increasing the power output of the engine and therefore cannot result in a constant speed.

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16.

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
- Increase blade angle.
- Decrease blade angle.
- Engage the low pitch stop.
- Engage the pitchlock ratchets.
Correct Answer

A. Increase blade angle.

Explanation

During an overspeed condition in the alpha range on the 54H60-117 propeller, the flyweights move the governor pilot valve to meter hydraulic fluid. This action is taken to counteract the excessive speed and prevent further acceleration of the propeller. By metering hydraulic fluid, the flyweights increase the blade angle, which results in a higher pitch and reduces the propeller's rotational speed. Therefore, the correct answer is to increase the blade angle.

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17.

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?
- 0 to 200.
- 300 to 500.
- 600 to 800.
- 900 to 1,100.
Correct Answer

A. 600 to 800.

Explanation

During feather operation on the 54H60-117 propeller, the pressure cutout switch contacts open within the range of 600 to 800 pounds per square inch (psi) of fluid pressure.

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18.

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

A. Above FLT IDLE.

Explanation

When attempting to unfeather the 54H60-117 propeller in flight, the throttle can be positioned at any throttle position. However, the correct answer is above FLT IDLE, indicating that the throttle should be set higher than the flight idle position. This is because unfeathering the propeller requires a higher power setting to provide the necessary oil pressure to move the feathering mechanism and restore the propeller to the normal operating position.

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19.

How much change in rpm does the compensating network in the synchrophaser unit allow the speed bias motor to correct?
- 2%.
- 4%.
- 6%.
- 8%.
Correct Answer

A. 2%.

Explanation

The compensating network in the synchrophaser unit allows the speed bias motor to correct a change in rpm of 2%. This means that the synchrophaser unit can adjust the speed bias motor to compensate for a small variation in rpm, ensuring that the system maintains synchronization and operates smoothly.

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20.

If the slave propeller blades are in the correct phase angle position during the synchrophasing governing mode, the resultant phase error voltage is
- +1.5.
- +1.
- 0.
- –1.
Correct Answer

A. 0.

Explanation

If the slave propeller blades are in the correct phase angle position during the synchrophasing governing mode, it means that they are perfectly synchronized with the master propeller. In this case, there is no phase error between the two propellers, resulting in a phase error voltage of 0.

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21.

When used for ground operation, the SGT engine can be installed on
- Pods.
- An H-frame.
- A two-wheel trailer.
- A four-wheel trailer.
Correct Answer

A. A four-wheel trailer.

Explanation

The SGT engine, when used for ground operation, can be installed on a four-wheel trailer. This suggests that the engine is designed to be mobile and can be easily transported using a trailer with four wheels. This configuration allows for flexibility and ease of movement, making it convenient for ground operations.

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22.

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

A. Beta set.

Explanation

The correct answer is Beta set. The question is asking which cam schedules a desired blade angle in the beta range on the 54H60-117 propeller. The term "beta range" refers to the range of blade angles that can be achieved by adjusting the propeller blades. The cam that is responsible for setting the desired blade angle in the beta range is the Beta set cam. This cam is specifically designed to control the blade angle and ensure that it is set correctly within the desired range.

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23.

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

A. PCBS.

Explanation

The PCBS (Propeller Control Blade Switch) is the switch located in the valve housing that is opened by a cam from 81° to 85° propeller blade angle on the 54H60–117 propeller. The PCBS is responsible for controlling the pitch of the propeller blades and adjusting them based on the desired blade angle.

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24.

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?
- Pitchlock.
- Standby.
- Reverse.
- Airstart.
Correct Answer

A. Reverse.

Explanation

When the backup valve is opened on the 54H60-117 propeller, the hydraulic pressure routed to the governor pilot valve is used for the operation of reversing the propeller.

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25.

The purpose of the 54H60–117 propeller pitchlock assembly is to prevent
- Loss of oil pressure.
- Flow of hydraulic fluid to the pilot valve.
- An engine overspeed due to a loss of power.
- Engine overspeed due to a loss of hydraulic pressure.
Correct Answer

A. Engine overspeed due to a loss of hydraulic pressure.

Explanation

The purpose of the 54H60–117 propeller pitchlock assembly is to prevent engine overspeed due to a loss of hydraulic pressure. This means that if there is a loss of hydraulic pressure, the pitchlock assembly will engage and prevent the propeller from rotating freely, thus preventing the engine from overspeeding. This is an important safety feature to ensure the engine operates within safe limits even in the event of a hydraulic system failure.

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26.

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

A. Movable wedge.

Explanation

The correct answer is the movable wedge. The stop levers on the low pitch stop are forced to move outward by the movable wedge.

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27.

On the 54H60–117 propeller, what is the minimum psi required to release the feather latches and allow the piston to move forward?
- 200
- 400
- 600
- 800
Correct Answer

A. 200

Explanation

The minimum psi required to release the feather latches and allow the piston to move forward on the 54H60-117 propeller is 200.

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28.

The “C” in the engine number GTCP 165 indicates that the engine
- Provides electrical power.
- Provides compressed air.
- Is gas powered.
- Is a turbine.
Correct Answer

A. Provides compressed air.

Explanation

The "C" in the engine number GTCP 165 indicates that the engine provides compressed air.

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29.

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

A. Pitchlock control cam.

Explanation

The pitchlock control cam is the component that mechanically holds the stationary and rotating pitchlock ratchets apart during reversing and unfeathering operations on the 54H60-117 propeller. This cam ensures that the pitchlock mechanism functions properly and allows for the desired pitch adjustments during these operations. The other options, such as the pitchlock ratchet piston, externally threaded ring, and externally splined spacer ring, do not perform this specific function.

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30.

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

A. Stop ring.

Explanation

The stop ring is the component in the dome assembly that limits cam travel and prevents the propeller from exceeding feather and reverse blade angles. It acts as a physical barrier, restricting the movement of the propeller blades beyond certain angles. This ensures that the propeller functions within its intended operating range and prevents any potential damage or malfunction.

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31.

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

A. Feather actuating.

Explanation

The feather actuating valve assists the feather solenoid valve with hydraulic positioning of the feather and pilot valves on the 54H60-117 propeller. This valve helps control the movement and positioning of the feather and pilot valves, ensuring proper operation of the propeller system.

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32.

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?
- Check.
- Bypass.
- Low pressure relief.
- High pressure relief.
Correct Answer

A. Check.

Explanation

The correct answer is "Check." In this context, a "check" valve is a type of valve that allows fluid to flow in one direction only. In this case, the check valve opens to allow the output of the standby pump to combine with the output of the main pump. This ensures that the fluid flows in the desired direction and prevents backflow or mixing of the fluids.

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33.

What type of force used during pitchlock of the 54H60–117 propeller prevents the blades from decreasing pitch?
- Spiral bending.
- Thrust bending.
- Centrifugal twisting moment.
- Aerodynamic twisting moment.
Correct Answer

A. Centrifugal twisting moment.

Explanation

The centrifugal twisting moment is the force that prevents the blades of the 54H60-117 propeller from decreasing pitch during pitchlock. This force is generated due to the rotation of the propeller and acts to counteract any external forces that would cause the blades to change their pitch. It is an important factor in maintaining the desired pitch of the propeller blades during operation.

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34.

During 54H60–117 propeller feathering operation, the feather valve is positioned to meter hydraulic fluid to the
- Aft end of the dome piston.
- Forward end of the dome piston.
- Decrease-pitch side of the pilot valve.
- Increase-pitch side of the pilot valve.
Correct Answer

A. Forward end of the dome piston.

Explanation

During the 54H60-117 propeller feathering operation, the feather valve is positioned to meter hydraulic fluid to the forward end of the dome piston. This means that the hydraulic fluid is being directed to the front of the dome piston, which is responsible for controlling the pitch of the propeller blades. By metering the fluid to the forward end of the dome piston, the propeller pitch is decreased, allowing for feathering of the propeller.

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35.

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

A. Fuel shutoff solenoid.

Explanation

The fuel shutoff solenoid closes to ensure that fuel flow is terminated during a GTCP 165 engine shutdown. This solenoid is responsible for controlling the fuel supply to the engine and shutting it off when necessary. By closing the fuel shutoff solenoid, the flow of fuel is stopped, preventing any further fuel from entering the engine and effectively shutting it down.

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36.

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

A. Beta feedback shaft.

Explanation

The beta feedback shaft delivers the actual propeller blade angle from the blade to the control assembly.

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37.

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

A. System is back on-speed.

Explanation

When the overspeed condition of the 54H60-117 propeller is corrected and the pilot valve is returned to the center position, the result is that the system is back on-speed. This means that the propeller is operating at the desired speed and is functioning properly.

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38.

When feathering the 54H60–117 propeller, what acts on the mechanical linkage to open the feather actuating valve?
- Throttle.
- Beta shaft.
- Pilot valve.
- Manual feather cam.
Correct Answer

A. Manual feather cam.

Explanation

When feathering the 54H60-117 propeller, the mechanical linkage is acted upon by the manual feather cam to open the feather actuating valve.

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39.

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

A. Speeder spring or flyweights.

Explanation

The correct answer is Speeder spring or flyweights. In the mechanical governing mode, the pilot valve is moved and sets the propeller speed by the action of the speeder spring or flyweights. These components work together to regulate the flow of oil to the propeller, thereby controlling its speed. The speeder spring provides the initial force to move the pilot valve, while the flyweights adjust the tension on the spring based on the rotational speed of the propeller. This allows for precise control of the propeller speed in the mechanical governing mode.

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40.

Which propeller governing modes add more functionality to basic mechanical governing mode?
- Synchrophasing and beta range.
- Normal and synchrophasing.
- Beta and normal range.
- Alpha and beta range.
Correct Answer

A. Normal and synchrophasing.

Explanation

Normal and synchrophasing governing modes add more functionality to the basic mechanical governing mode. Normal governing mode adjusts the propeller blade angle to maintain a constant engine speed, while synchrophasing mode synchronizes the propeller speeds on multi-engine aircraft, reducing noise and vibration. This combination of modes enhances the control and performance of the propeller system beyond the basic mechanical governing mode.

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41.

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
- At or above FLT IDLE and the synchrophase master switch in the ENG 2 or ENG 3 position.
- At or above FLT IDLE and the synchrophase master switch in the OFF position.
- Below FLT IDLE and the prop resynchrophase switch in RESYNC/INDEX.
- Below FLT IDLE and the fuel governing switch in CHECK.
Correct Answer

A. At or above FLT IDLE and the synchrophase master switch in the OFF position.

Explanation

In order for the 54H60-117 propeller to operate in the normal governing mode, the throttle must be at or above FLT IDLE and the synchrophase master switch must be in the OFF position. This means that the throttle needs to be set to a certain level and the synchrophase master switch should not be engaged. These conditions are necessary for the propeller governor control switch to function properly and regulate the propeller's operation.

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42.

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?
- Max Reverse.
- Ground Idle.
- Take Off.
- Feather.
Correct Answer

A. Feather.

Explanation

If the R391 Dowty propeller loses hydraulic pressure, the counterweights installed at the root of each propeller blade would drive the propeller blades toward the feather position. Feathering refers to the process of aligning the propeller blades with the airflow to minimize drag and prevent windmilling. By feathering the propeller blades, the aircraft can reduce the resistance caused by a non-functioning propeller and maintain better control during an emergency situation.

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43.

What R391 Dowty propeller assembly part provides an aerodynamic faring over the aft section of the hub?
- Backplate.
- Rear spinner.
- Front spinner.
- Afterbody assemblies.
Correct Answer

A. Backplate.

Explanation

The backplate is the correct answer because it provides an aerodynamic faring over the aft section of the hub. The backplate is a component of the R391 Dowty propeller assembly and is designed to streamline the airflow and reduce drag at the rear of the hub. It helps to improve the overall performance and efficiency of the propeller system. The rear spinner, front spinner, and afterbody assemblies are not specifically mentioned as providing an aerodynamic faring over the aft section of the hub, making them incorrect choices.

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44.

The impeller wheel and two turbine wheels in the turbine section of the GTCP 165 engine are connected by
- Couplings on a common shaft.
- A gear reduction gearbox.
- Helical splines.
- Tie bolts.
Correct Answer

A. Couplings on a common shaft.

Explanation

The impeller wheel and two turbine wheels in the turbine section of the GTCP 165 engine are connected by couplings on a common shaft. This means that the impeller wheel and the two turbine wheels are attached to the same shaft, allowing them to rotate together. Couplings are mechanical devices used to connect two shafts together, transmitting power and torque between them. In this case, the couplings on a common shaft ensure that the impeller wheel and the turbine wheels are synchronized and work in tandem to generate power in the engine.

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45.

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?
- Beta set.
- Speed set.
- Backup valve.
- Beta follow-up.
Correct Answer

A. Speed set.

Explanation

The correct answer is "Speed set." During alpha range operation on the 54H60-117 propeller, the speed set cam changes the tension of the speeder spring. This adjustment allows the governor pilot valve to maintain 100 percent engine speed.

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46.

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

A. Ball bearings.

Explanation

The rotating cam and stationary cam need to move independently of each other in order for the propeller to function properly. Ball bearings are designed to allow smooth rotation of one part while keeping another part fixed, making them the most suitable option for this purpose. Roller shaft, track slopes, and roller bearings do not provide the same level of flexibility and independence required in this scenario.

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47.

On the 54H60–117 propeller, when standby pump output is not required, where is it routed?
- Atmospheric sump.
- Pressurized sump.
- Dome assembly.
- Pilot valve.
Correct Answer

A. Pressurized sump.

Explanation

When the standby pump output is not required on the 54H60-117 propeller, it is routed to the pressurized sump.

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48.

What is coordinated by the throttle in the controllable pitch range?
- Propeller blade pitch and engine fuel flow.
- Propeller blade pitch and temperature limiting.
- Engine fuel flow and constant speed governing.
- Temperature limiting and constant speed governing.
Correct Answer

A. Propeller blade pitch and engine fuel flow.

Explanation

The throttle is responsible for coordinating the propeller blade pitch and engine fuel flow in the controllable pitch range. This means that the throttle controls the amount of fuel being delivered to the engine, which in turn affects the pitch of the propeller blades. By adjusting the pitch and fuel flow, the throttle helps to optimize the performance of the engine and propeller system.

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49.

During an underspeed condition on the 54H60–117 propeller, what moves the pilot valve?
- Decreased hydraulic pressure.
- Increased hydraulic pressure.
- Speeder spring.
- Flyweights.
Correct Answer

A. Speeder spring.

Explanation

The speeder spring moves the pilot valve during an underspeed condition on the 54H60-117 propeller. The speeder spring is responsible for controlling the propeller's speed by adjusting the pitch of the blades. When the propeller is running at a lower speed than desired, the speeder spring will move the pilot valve to increase the hydraulic pressure and adjust the pitch to increase the speed.

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Jun 19, 2023

Quiz Edited by
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Oct 02, 2012

Quiz Created by
Iloveproprofs

CDC Volume 4 Edit Code 2

Which 54H60–117 propeller subassembly transmits engine torque to the propeller blades?

Quiz Preview

Which 54H60–117 propeller subassembly carries high centrifugal loads created by the propeller blades?

On the 54H60–117 propeller, what function is a task of the low pitch stop assembly?

On the 54H60–117 propeller, what is the beta range indication display on the coordinator?

On the 54H60–117 propeller, which pump(s) is/are used during propeller static operation?

The 54H60–117 propeller governor speeder spring tension positions the pilot valve to maintain what percent rpm in the beta range?

On the 54H60–117 propeller, if the main filter becomes clogged, which valve opens to assure continued flow?

On the 54H60–117 propeller, which pressure pump is used to feather or unfeather the propeller during static propeller operation?

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?

Besides maintaining the optimum blade phase angle relationship between all propellers, synchrophasing also

The pneumatic air bled from the small gas turbine engine cannot be used to

On the 54H60–117 propeller, what component is installed on the blade before the blade butt is formed during manufacture?

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?

On the 54H60–117 propeller, during normal propeller operation, the output of which pumps is used?

Constant speed can only occur when the throttle is positioned from

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

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?

When attempting to unfeather the 54H60–117 propeller in flight, where must the throttle be positioned?

How much change in rpm does the compensating network in the synchrophaser unit allow the speed bias motor to correct?

If the slave propeller blades are in the correct phase angle position during the synchrophasing governing mode, the resultant phase error voltage is

When used for ground operation, the SGT engine can be installed on

On the 54H60–117 propeller, which cam schedules a desired blade angle in the beta range?

On the 54H60–117 propeller, what switch, located in the valve housing, is opened by a cam from 81 to 85 propeller blade angle?

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?

The purpose of the 54H60–117 propeller pitchlock assembly is to prevent

On the 54H60–117 propeller, what forces the stop levers on the low pitch stop to move outward?

On the 54H60–117 propeller, what is the minimum psi required to release the feather latches and allow the piston to move forward?

The “C” in the engine number GTCP 165 indicates that the engine

On the 54H60–117 propeller, which pitchlock component mechanically holds the stationary and rotating pitchlock ratchets apart during reversing and unfeathering operations?

On the 54H60–117 propeller, which dome assembly component limits cam travel and prevents the propeller from exceeding feather and reverse blade angles?

On the 54H60–117 propeller, which valve assists the feather solenoid valve with hydraulic positioning of the feather and pilot valves?

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?

What type of force used during pitchlock of the 54H60–117 propeller prevents the blades from decreasing pitch?

During 54H60–117 propeller feathering operation, the feather valve is positioned to meter hydraulic fluid to the

On GTCP 165 engine shutdown, what valve closes to ensure fuel-flow is terminated?

On the 54H60–117 propeller, which component delivers the actual propeller blade angle from the blade to the control assembly?

Once an overspeed 54H60–117 propeller condition is corrected and the pilot valve is returned to the center position, what is the result?

When feathering the 54H60–117 propeller, what acts on the mechanical linkage to open the feather actuating valve?

In the mechanical governing mode, what causes the pilot valve to move and set the 54H60– 117 propeller speed?

Which propeller governing modes add more functionality to basic mechanical governing mode?

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

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?

What R391 Dowty propeller assembly part provides an aerodynamic faring over the aft section of the hub?

The impeller wheel and two turbine wheels in the turbine section of the GTCP 165 engine are connected by

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?

On the 54H60–117 propeller, which dome assembly part allows the rotating cam to turn while the stationary cam remains in a fixed position?

On the 54H60–117 propeller, when standby pump output is not required, where is it routed?

What is coordinated by the throttle in the controllable pitch range?

During an underspeed condition on the 54H60–117 propeller, what moves the pilot valve?