CDC 2A651 Volume 4. Propellers And Small Gas Turbines (Q 1-15)

1. On the 54H60-91 propeller, which component provides a means for balancing the propeller?

Deicer contact ring holder.

Hub mounting bulkhead.

Front spinner.

Afterbody.

The hub mounting bulkhead provides a means for balancing the propeller on the 54H60-91 propeller. Balancing the propeller is important to ensure smooth and efficient operation, as an unbalanced propeller can cause vibrations and reduce performance. The hub mounting bulkhead is responsible for securely attaching the propeller blades to the hub, and it also allows for adjustments to be made to achieve proper balance.

Explanation

The hub mounting bulkhead provides a means for balancing the propeller on the 54H60-91 propeller. Balancing the propeller is important to ensure smooth and efficient operation, as an unbalanced propeller can cause vibrations and reduce performance. The hub mounting bulkhead is responsible for securely attaching the propeller blades to the hub, and it also allows for adjustments to be made to achieve proper balance.

2. On the 54H60-91 propeller, during normal propeller operation, the output of which pumps is used?

Main pressure and main scavenge.

Standby pressure and main scavenge.

Auxiliiary pressure and main pressure.

Auxiliary pressure and auxiliary scavenge.

During normal propeller operation on the 54H60-91 propeller, the output of the main pressure and main scavenge pumps is used. These pumps are responsible for maintaining the necessary pressure and scavenging functions in the propeller system. The main pressure pump ensures that the propeller receives sufficient hydraulic pressure for operation, while the main scavenge pump removes any excess oil from the propeller system. Both pumps work together to ensure smooth and efficient propeller operation.

Explanation

During normal propeller operation on the 54H60-91 propeller, the output of the main pressure and main scavenge pumps is used. These pumps are responsible for maintaining the necessary pressure and scavenging functions in the propeller system. The main pressure pump ensures that the propeller receives sufficient hydraulic pressure for operation, while the main scavenge pump removes any excess oil from the propeller system. Both pumps work together to ensure smooth and efficient propeller operation.

3. Which 54H60-91 propeller subassembly transmits engine torque to the propeller blades?

Barrel.

Control.

Low pitch stop.

Pitchlock regulator.

The correct answer is "Barrel." The barrel is the component of the 54H60-91 propeller subassembly that transmits engine torque to the propeller blades. It is responsible for transferring the rotational force from the engine to the blades, allowing them to spin and generate thrust. The barrel is designed to be durable and withstand the high levels of torque generated by the engine, ensuring efficient and reliable operation of the propeller system.

Explanation

The correct answer is "Barrel." The barrel is the component of the 54H60-91 propeller subassembly that transmits engine torque to the propeller blades. It is responsible for transferring the rotational force from the engine to the blades, allowing them to spin and generate thrust. The barrel is designed to be durable and withstand the high levels of torque generated by the engine, ensuring efficient and reliable operation of the propeller system.

4. On the 54H60-91 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.

The beta feedback shaft delivers the actual propeller blade angle from the blade to the control assembly on the 54H60-91 propeller. This component is responsible for transmitting the position of the blade to the control system, allowing for precise control of the propeller's angle. The microadjusting ring, blade segment gear, and blade bushing are not directly involved in delivering the propeller blade angle to the control assembly.

Explanation

The beta feedback shaft delivers the actual propeller blade angle from the blade to the control assembly on the 54H60-91 propeller. This component is responsible for transmitting the position of the blade to the control system, allowing for precise control of the propeller's angle. The microadjusting ring, blade segment gear, and blade bushing are not directly involved in delivering the propeller blade angle to the control assembly.

5. ON the 54H60-91 propeller, which valve, contained in the valve housing, controls the flow of hydraulic fluid to and from the dome assembly?

Standby.

Feather.

Backup.

Pilot.

The correct answer is "Pilot." On the 54H60-91 propeller, the valve contained in the valve housing that controls the flow of hydraulic fluid to and from the dome assembly is the pilot valve. This valve is responsible for regulating the hydraulic pressure and directing it to the appropriate areas of the propeller system.

Explanation

The correct answer is "Pilot." On the 54H60-91 propeller, the valve contained in the valve housing that controls the flow of hydraulic fluid to and from the dome assembly is the pilot valve. This valve is responsible for regulating the hydraulic pressure and directing it to the appropriate areas of the propeller system.

6. 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.

Pitchlock ratchet piston.

Externally threaded ring.

Externally splined spacer ring.

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=91 propeller. This cam ensures that the ratchets remain in the correct position to allow for the desired operation to take place.

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=91 propeller. This cam ensures that the ratchets remain in the correct position to allow for the desired operation to take place.

7. On the 54H60-91 propeller, what is the function of the differential gear train assembly?

Drives the main and standby pressure pumps.

Controls operation of the pilot valve and serves as an electrical ground.

Drives the rotating sleeve when the throttle is positioned in the beta range.

Transmits blade angle movement to the valve housing and drives the propeller governor flyweights.

The differential gear train assembly on the 54H60-91 propeller is responsible for transmitting the movement of the blade angle to the valve housing. It also drives the propeller governor flyweights, which are crucial for controlling the propeller speed and pitch. This assembly plays a vital role in ensuring the proper functioning and control of the propeller system.

Explanation

The differential gear train assembly on the 54H60-91 propeller is responsible for transmitting the movement of the blade angle to the valve housing. It also drives the propeller governor flyweights, which are crucial for controlling the propeller speed and pitch. This assembly plays a vital role in ensuring the proper functioning and control of the propeller system.

8. The 54H60-91 propeller governor speeder spring tension positions the pilot valve to maintain what percent rpm in the beta range?

99 to 103%

104 to 108%

109 to 113%

114 to 118%

The 54H60-91 propeller governor speeder spring tension positions the pilot valve to maintain a percentage of rpm in the beta range. The correct answer is 109 to 113%.

Explanation

The 54H60-91 propeller governor speeder spring tension positions the pilot valve to maintain a percentage of rpm in the beta range. The correct answer is 109 to 113%.

9. On the 54H60-91 propeller, which dome assembly parts allows the rotating cam to turn while the stationary cam remains in a fixed position?

Roller shaft.

Track slopes.

Ball bearings.

Roller bearings.

Ball bearings are the parts that allow the rotating cam to turn while the stationary cam remains fixed. Ball bearings are designed to reduce friction and allow smooth rotation by using small metal balls that are placed between two surfaces. The balls roll and distribute the load evenly, enabling the rotating cam to move freely while the stationary cam remains in place. This ensures proper functioning of the propeller dome assembly.

Explanation

Ball bearings are the parts that allow the rotating cam to turn while the stationary cam remains fixed. Ball bearings are designed to reduce friction and allow smooth rotation by using small metal balls that are placed between two surfaces. The balls roll and distribute the load evenly, enabling the rotating cam to move freely while the stationary cam remains in place. This ensures proper functioning of the propeller dome assembly.

10. On the 54H60-91 propeller, which component is used in place of a shim plate on the NO. 1 blade?

Beveled thrust washer.

Stationary ratchet.

Beta segment gear.

Blade barrel shim.

The beta segment gear is used in place of a shim plate on the NO. 1 blade of the 54H60-91 propeller. This component serves the purpose of adjusting the pitch angle of the blade. It allows for fine-tuning of the blade's position to optimize performance and efficiency. The beveled thrust washer, stationary ratchet, and blade barrel shim are not used in place of a shim plate on the NO. 1 blade.

Explanation

The beta segment gear is used in place of a shim plate on the NO. 1 blade of the 54H60-91 propeller. This component serves the purpose of adjusting the pitch angle of the blade. It allows for fine-tuning of the blade's position to optimize performance and efficiency. The beveled thrust washer, stationary ratchet, and blade barrel shim are not used in place of a shim plate on the NO. 1 blade.

11. On the 54H60-91 propeller, which is a function of the pitchlock regulator?

Stops the dome piston from increasing blade angle above 23.3

Prevents the blades from decreasing pitch if hydraulic pressure is lost.

Prevents the cam bearing rollers from bottoming out in the track slopes.

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

The function of the pitchlock regulator on the 54H60-91 propeller is to prevent the blades from decreasing pitch if hydraulic pressure is lost. This means that if there is a loss of hydraulic pressure, the pitchlock regulator will ensure that the blades remain in their current position and do not automatically decrease pitch. This is important for maintaining control and stability of the propeller in the event of a hydraulic failure.

Explanation

The function of the pitchlock regulator on the 54H60-91 propeller is to prevent the blades from decreasing pitch if hydraulic pressure is lost. This means that if there is a loss of hydraulic pressure, the pitchlock regulator will ensure that the blades remain in their current position and do not automatically decrease pitch. This is important for maintaining control and stability of the propeller in the event of a hydraulic failure.

12. On the 54H60-91 propeller, which pump assists the main pressure pump when large blade angle movements are required?

Main scavenge.

Standby pressure.

Auxiliary pressure.

Auxiliary scavenge.

The standby pressure pump assists the main pressure pump when large blade angle movements are required on the 54H60-91 propeller. This pump provides additional hydraulic pressure to support the main pump during these movements, ensuring that the propeller operates smoothly and efficiently.

Explanation

The standby pressure pump assists the main pressure pump when large blade angle movements are required on the 54H60-91 propeller. This pump provides additional hydraulic pressure to support the main pump during these movements, ensuring that the propeller operates smoothly and efficiently.

13. On the 54H60-91 propeller,which cam disarms the NTS system linkage when the throttle is positioned in the beta range?

Manual feather.

Beta follow-up.

Speed set.

Beta set.

The correct answer is Manual feather. On the 54H60-91 propeller, the cam that disarms the NTS (Negative Torque Sensing) system linkage when the throttle is positioned in the beta range is the Manual feather cam. This cam allows the pilot to manually feather the propeller blades, which is the process of aligning the blades with the airflow to reduce drag and prevent windmilling. By disarming the NTS system linkage, the propeller blades can be manually controlled in the beta range without the interference of the NTS system.

Explanation

The correct answer is Manual feather. On the 54H60-91 propeller, the cam that disarms the NTS (Negative Torque Sensing) system linkage when the throttle is positioned in the beta range is the Manual feather cam. This cam allows the pilot to manually feather the propeller blades, which is the process of aligning the blades with the airflow to reduce drag and prevent windmilling. By disarming the NTS system linkage, the propeller blades can be manually controlled in the beta range without the interference of the NTS system.

14. On the 54H60-91 propeller, hydraulic fluid is directed from the pump housing to the barrel assembly through what component?

Valve housing.

Low pitch stop.

Transfer bearings.

Pitchlock regulator.

The transfer bearings are responsible for directing hydraulic fluid from the pump housing to the barrel assembly on the 54H60-91 propeller. These bearings facilitate the smooth transfer of fluid, ensuring proper functioning of the propeller system.

Explanation

The transfer bearings are responsible for directing hydraulic fluid from the pump housing to the barrel assembly on the 54H60-91 propeller. These bearings facilitate the smooth transfer of fluid, ensuring proper functioning of the propeller system.

15. 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 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.

The low pitch stop assembly on the 54H60-91 propeller is responsible for preventing the blades from decreasing pitch in the event of an overspeed condition. This assembly acts as a safety mechanism to ensure that the propeller does not go into a lower pitch angle, which could potentially lead to an uncontrollable increase in speed. By limiting the pitch decrease, the low pitch stop assembly helps maintain the stability and control of the propeller system during an overspeed situation.

Explanation

The low pitch stop assembly on the 54H60-91 propeller is responsible for preventing the blades from decreasing pitch in the event of an overspeed condition. This assembly acts as a safety mechanism to ensure that the propeller does not go into a lower pitch angle, which could potentially lead to an uncontrollable increase in speed. By limiting the pitch decrease, the low pitch stop assembly helps maintain the stability and control of the propeller system during an overspeed situation.