CDC Volume 4 Edit Code 2

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

Barrel.

Control.

Low pitch stop.

Pitchlock regulator.

The correct answer is "Barrel." In a 54H60-117 propeller subassembly, the barrel is responsible for transmitting the engine torque to the propeller blades. The barrel is a crucial component that connects the engine to the propeller and ensures that the power generated by the engine is effectively transferred to the blades, allowing them to rotate and generate thrust.

Explanation

The correct answer is "Barrel." In a 54H60-117 propeller subassembly, the barrel is responsible for transmitting the engine torque to the propeller blades. The barrel is a crucial component that connects the engine to the propeller and ensures that the power generated by the engine is effectively transferred to the blades, allowing them to rotate and generate thrust.

2. 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.

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

Explanation

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

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

Dome.

Barrel.

Control.

Front spinner.

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

Explanation

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

4. 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 alpharange.

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 54H60-117 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.

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.

5. 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.

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.

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.

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%.

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.

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.

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.

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.

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.

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.

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

Explanation

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

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.

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.

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.

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.

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.

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.

11. 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.

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.

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.

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

Pods.

An H-frame.

A two-wheel trailer.

A four-wheel trailer.

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.

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.

13. 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.

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.

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.

14. 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.

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.

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.

15. 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.

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.

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.

16. 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.

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.

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.

17. 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.

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.

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.

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

2%.

4%.

6%.

8%.

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.

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.

19. 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.

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.

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.

20. 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.

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.

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.

21. 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.

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.

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.

22. The "C" in the engine number GTCP 165 indicates that the engine

Provides electrical power.

Provides compressed air.

Is gas powered.

Is a turbine.

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

Explanation

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

23. 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.

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.

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.

24. 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.

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.

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.

25. 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.

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.

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.

26. 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.

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.

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.

27. 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.

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

28. 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

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

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.

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.

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.

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

Poppet.

Scheduling.

Fuel flow divider.

Fuel shutoff solenoid.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

35. 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.

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.

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.

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.

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

Explanation

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

37. 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.

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.

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.

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

Backplate.

Rear spinner.

Front spinner.

Afterbody assemblies.

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.

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.

39. 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.

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.

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.

40. 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.

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.

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.

41. 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.

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

Explanation

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

42. 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.

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.

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.

43. 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.

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.

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.

44. 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.

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.

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.

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.

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.

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.

46. On a GTCP 165 engine oil system, air that leaks past various oil seals exits through the

Vent system.

Pressure system.

Scavenge system.

Auxiliary system.

The correct answer is the vent system. In a GTCP 165 engine oil system, air that leaks past oil seals is released through the vent system. The vent system is designed to allow the escape of excess air or pressure from the system, preventing any build-up that could potentially cause damage or malfunction. This ensures the proper functioning and efficiency of the oil system.

Explanation

The correct answer is the vent system. In a GTCP 165 engine oil system, air that leaks past oil seals is released through the vent system. The vent system is designed to allow the escape of excess air or pressure from the system, preventing any build-up that could potentially cause damage or malfunction. This ensures the proper functioning and efficiency of the oil system.

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.

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

Explanation

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

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.

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.

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.

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

Decreased hydraulic pressure.

Increased hydraulic pressure.

Speeder spring.

Flyweights.

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.

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.

50. 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.

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.

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.

51. During the 54H60–117 propeller feathering operation, which valve acts as a backup for the feather actuating valve?

Pilot.

Feather.

Feather solenoid.

Standby pump check.

The feather solenoid acts as a backup for the feather actuating valve during the 54H60-117 propeller feathering operation. This means that if the feather actuating valve fails, the feather solenoid can still be used to control the feathering operation.

Explanation

The feather solenoid acts as a backup for the feather actuating valve during the 54H60-117 propeller feathering operation. This means that if the feather actuating valve fails, the feather solenoid can still be used to control the feathering operation.

52. Which component on the 54H60–117 propeller is the primary electrical ground for energizing the feather override holding coil?

Feather relay.

Feather solenoid.

Pressure cutout switch.

Pressure cutout backup switch (PCBS).

The pressure cutout switch is the primary electrical ground for energizing the feather override holding coil. This means that when the pressure cutout switch is activated, it provides the necessary electrical connection for the feather override holding coil to be energized. This allows the propeller to be feathered in emergency situations. The other options, such as the feather relay, feather solenoid, and pressure cutout backup switch, do not serve as the primary electrical ground for energizing the feather override holding coil.

Explanation

The pressure cutout switch is the primary electrical ground for energizing the feather override holding coil. This means that when the pressure cutout switch is activated, it provides the necessary electrical connection for the feather override holding coil to be energized. This allows the propeller to be feathered in emergency situations. The other options, such as the feather relay, feather solenoid, and pressure cutout backup switch, do not serve as the primary electrical ground for energizing the feather override holding coil.

53. When an increase in rpm occurs during engine speed stabilization, how is an overspeed condition prevented?

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

Increase speeder spring tension and position the pilot valve to decrease blade angle.

Decrease flyweight rotation and position the pilot valve to increase blade angle.

Increase flyweight rotation and position the pilot valve to decrease blade angle.

When an increase in rpm occurs during engine speed stabilization, an overspeed condition is prevented by decreasing speeder spring tension. This reduces the force exerted by the speeder spring on the flyweights, causing them to move inward and increase the blade angle. By positioning the pilot valve to increase the blade angle, the airflow through the engine is restricted, which helps to decrease the engine speed and prevent an overspeed condition.

Explanation

When an increase in rpm occurs during engine speed stabilization, an overspeed condition is prevented by decreasing speeder spring tension. This reduces the force exerted by the speeder spring on the flyweights, causing them to move inward and increase the blade angle. By positioning the pilot valve to increase the blade angle, the airflow through the engine is restricted, which helps to decrease the engine speed and prevent an overspeed condition.

54. How many slave channels are contained on the master synchrophaser board in the synchrophaser unit?

One.

Two.

Three.

Four.

The correct answer is one because the question asks about the number of slave channels on the master synchrophaser board. This implies that there is only one slave channel on the board.

Explanation

The correct answer is one because the question asks about the number of slave channels on the master synchrophaser board. This implies that there is only one slave channel on the board.

55. During a normal start on a GTCP 165 engine, the igniter plug continues firing until engine rotation in rpm reaches

75 percent.

80 percent.

95 percent.

100 percent.

During a normal start on a GTCP 165 engine, the igniter plug continues firing until engine rotation in rpm reaches 95 percent. This means that the igniter plug will keep firing until the engine rotation reaches 95 percent of its maximum speed. Once the engine reaches this speed, the igniter plug is no longer needed and can be turned off.

Explanation

During a normal start on a GTCP 165 engine, the igniter plug continues firing until engine rotation in rpm reaches 95 percent. This means that the igniter plug will keep firing until the engine rotation reaches 95 percent of its maximum speed. Once the engine reaches this speed, the igniter plug is no longer needed and can be turned off.

56. During normal GTCP 165 engine shutdown, what circuit trips to stop the engine?

100-percent circuit.

110-percent circuit.

Load-control circuit.

Speed-switch control circuit.

During a normal GTCP 165 engine shutdown, the 110-percent circuit trips to stop the engine. This circuit is responsible for monitoring the engine's performance and ensuring that it does not exceed its maximum operating limit, which is typically set at 110 percent of its rated capacity. When this circuit detects that the engine is operating above this limit, it triggers a shutdown sequence to prevent any potential damage or unsafe conditions. Therefore, the 110-percent circuit is the correct answer for this question.

Explanation

During a normal GTCP 165 engine shutdown, the 110-percent circuit trips to stop the engine. This circuit is responsible for monitoring the engine's performance and ensuring that it does not exceed its maximum operating limit, which is typically set at 110 percent of its rated capacity. When this circuit detects that the engine is operating above this limit, it triggers a shutdown sequence to prevent any potential damage or unsafe conditions. Therefore, the 110-percent circuit is the correct answer for this question.

57. On a GTCP 165 engine, air for the load control system is extracted from the

Torus.

Combustor.

Turbine plenum.

Compressor deswirl vanes.

The correct answer is turbine plenum. In a GTCP 165 engine, the air for the load control system is extracted from the turbine plenum. The turbine plenum is a chamber located between the turbine and the combustor, where air is collected and distributed to various systems within the engine. This air is used for various purposes, including controlling the load on the engine. Extracting air from the turbine plenum ensures that the load control system receives a sufficient and controlled airflow for optimal engine performance.

Explanation

The correct answer is turbine plenum. In a GTCP 165 engine, the air for the load control system is extracted from the turbine plenum. The turbine plenum is a chamber located between the turbine and the combustor, where air is collected and distributed to various systems within the engine. This air is used for various purposes, including controlling the load on the engine. Extracting air from the turbine plenum ensures that the load control system receives a sufficient and controlled airflow for optimal engine performance.

58. The master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel used by propellers

No. 1 and No. 2.

No. 2 and No. 3.

No. 3 and No. 4.

No. 1 through 4.

The master synchrophaser board in the synchrophaser unit contains a master channel and a slave channel. This indicates that the board is capable of controlling and synchronizing two channels, with one channel acting as the master and the other as the slave. Therefore, the correct answer is No. 2 and No. 3, as these options include both the master and slave channels.

Explanation

The master synchrophaser board in the synchrophaser unit contains a master channel and a slave channel. This indicates that the board is capable of controlling and synchronizing two channels, with one channel acting as the master and the other as the slave. Therefore, the correct answer is No. 2 and No. 3, as these options include both the master and slave channels.

59. What type of sump design is the oil system on a GTCP 165 engine?

Wet.

Dry.

Hot.

Cold.

The oil system on a GTCP 165 engine is a wet sump design. In a wet sump system, the oil is stored in a reservoir located within the engine's crankcase. This design allows for easy access to the oil and simplifies the lubrication process.

Explanation

The oil system on a GTCP 165 engine is a wet sump design. In a wet sump system, the oil is stored in a reservoir located within the engine's crankcase. This design allows for easy access to the oil and simplifies the lubrication process.

60. On a GTCP 165 engine, which component shuts the engine down if the oil pressure drops below the safe minimum operating limit?

Oil/air cooler.

Oil filter assembly.

Oil pressure switch.

Oil pressure regulator valve.

The oil pressure switch is responsible for shutting down the GTCP 165 engine if the oil pressure drops below the safe minimum operating limit. It is designed to sense the pressure of the engine oil and trigger the shutdown mechanism when the pressure falls below the specified threshold. This is a crucial safety feature as low oil pressure can lead to engine damage or failure, and shutting down the engine in such situations helps prevent further harm.

Explanation

The oil pressure switch is responsible for shutting down the GTCP 165 engine if the oil pressure drops below the safe minimum operating limit. It is designed to sense the pressure of the engine oil and trigger the shutdown mechanism when the pressure falls below the specified threshold. This is a crucial safety feature as low oil pressure can lead to engine damage or failure, and shutting down the engine in such situations helps prevent further harm.

61. On the 54H60–117 propeller, during beta range operation, what moves the pilot valve?

Cams and mechanical linkage.

Flyweights and speeder spring.

Hydraulic pressure.

Throttle.

During beta range operation, the pilot valve on the 54H60-117 propeller is moved by cams and mechanical linkage. These components work together to control the flow of hydraulic pressure, which is necessary for adjusting the pitch of the propeller blades. The cams and mechanical linkage mechanism ensures that the pilot valve moves in response to the desired changes in propeller pitch, allowing for precise control and adjustment during beta range operation.

Explanation

During beta range operation, the pilot valve on the 54H60-117 propeller is moved by cams and mechanical linkage. These components work together to control the flow of hydraulic pressure, which is necessary for adjusting the pitch of the propeller blades. The cams and mechanical linkage mechanism ensures that the pilot valve moves in response to the desired changes in propeller pitch, allowing for precise control and adjustment during beta range operation.

62. What rpm in the alpha range are the fuel governing check switches used to reset the propeller governor?

100%.

102%.

104%.

106%.

The correct answer is 106%. This suggests that the fuel governing check switches are used to reset the propeller governor when the rpm is in the alpha range and reaches 106%.

Explanation

The correct answer is 106%. This suggests that the fuel governing check switches are used to reset the propeller governor when the rpm is in the alpha range and reaches 106%.

63. On the 54H60–91 propeller speed bias motor, what results when the control winding voltage is different from the reference-winding voltage?

Throttle anticipation potentiometer speeds up or slows down the engine.

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

Feedback potentiometer recenters the speed bias motor.

Speed bias servo control locks the clutch and brake unit.

When the control winding voltage is different from the reference-winding voltage on the 54H60-91 propeller speed bias motor, the speed bias motor rotates. This rotation of the motor results in an increase or decrease in the blade angle.

Explanation

When the control winding voltage is different from the reference-winding voltage on the 54H60-91 propeller speed bias motor, the speed bias motor rotates. This rotation of the motor results in an increase or decrease in the blade angle.

64. 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?

Pilot valve.

Beta set cam.

Speed set cam.

Feather actuating valve.

When a negative torque condition occurs on the 54H60-117 propeller, the NTS system actuator rod positions the mechanical linkage in the valve housing. This movement causes the feather actuating valve to shift, allowing the propeller blades to move into the feather position. Therefore, the correct answer is the feather actuating valve.

Explanation

When a negative torque condition occurs on the 54H60-117 propeller, the NTS system actuator rod positions the mechanical linkage in the valve housing. This movement causes the feather actuating valve to shift, allowing the propeller blades to move into the feather position. Therefore, the correct answer is the feather actuating valve.

65. What prevents engagement of the stationary and rotating ratchets on the 54H60–117 propeller when blade angles are below 25° and above 55°?

Loss of hydraulic pressure.

The pitchlock control cam.

An overspeed in excess of 103.5%.

Increase- or decrease pitch pressure.

The pitchlock control cam prevents engagement of the stationary and rotating ratchets on the 54H60-117 propeller when blade angles are below 25° and above 55°.

Explanation

The pitchlock control cam prevents engagement of the stationary and rotating ratchets on the 54H60-117 propeller when blade angles are below 25° and above 55°.

66. Which R391 Dowty propeller component routes engine oil to and from the cylinder and piston?

Beta tube.

GBE valve.

PUAD.

GMAD.

The correct answer is Beta tube. The Beta tube is a component of the R391 Dowty propeller that is responsible for routing engine oil to and from the cylinder and piston. It plays a crucial role in lubricating and cooling the engine during operation.

Explanation

The correct answer is Beta tube. The Beta tube is a component of the R391 Dowty propeller that is responsible for routing engine oil to and from the cylinder and piston. It plays a crucial role in lubricating and cooling the engine during operation.

67. What will keep the rotating and stationary ratchets disengaged on the 54H60–117 propeller when the blade angles are between 25° and 55°?

Loss of hydraulic pressure.

The pitchlock control cam.

An overspeed in excess of 103.5%.

Increase- or decrease pitch pressure.

When the blade angles are between 25° and 55°, the rotating and stationary ratchets of the 54H60–117 propeller will remain disengaged if there is an increase or decrease in pitch pressure. This means that either an increase or decrease in hydraulic pressure will prevent the ratchets from engaging, allowing the propeller blades to freely rotate.

Explanation

When the blade angles are between 25° and 55°, the rotating and stationary ratchets of the 54H60–117 propeller will remain disengaged if there is an increase or decrease in pitch pressure. This means that either an increase or decrease in hydraulic pressure will prevent the ratchets from engaging, allowing the propeller blades to freely rotate.

68. On the 54H60–117 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 54H60-117 propeller, the cam responsible for disarming 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 helps in reducing drag and increasing the efficiency of the aircraft during certain flight conditions.

Explanation

The correct answer is Manual feather. On the 54H60-117 propeller, the cam responsible for disarming 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 helps in reducing drag and increasing the efficiency of the aircraft during certain flight conditions.

69. During the 54H60–117 propeller feathering operation, which valve blocks off the standby pump output and causes hydraulic pressure to increase?

Feather.

Standby check.

Feather solenoid.

Feather actuating.

During the 54H60-117 propeller feathering operation, the feather actuating valve blocks off the standby pump output and causes hydraulic pressure to increase. This valve is responsible for controlling the flow of hydraulic fluid and directing it to the necessary components for feathering the propeller. By blocking off the standby pump output, the valve ensures that the hydraulic pressure is increased, which is essential for the successful feathering operation.

Explanation

During the 54H60-117 propeller feathering operation, the feather actuating valve blocks off the standby pump output and causes hydraulic pressure to increase. This valve is responsible for controlling the flow of hydraulic fluid and directing it to the necessary components for feathering the propeller. By blocking off the standby pump output, the valve ensures that the hydraulic pressure is increased, which is essential for the successful feathering operation.

70. On a GTCP 165 engine, which signals are used by the fuel control unit to control engine operation?

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

Ambient inlet pressure and turbine exhaust pressure.

Engine speed and turbine inlet temperature.

Pt0 and Pt7.

The fuel control unit on a GTCP 165 engine uses engine speed and pneumatic thermostat (load control) air pressure to control engine operation. Engine speed is an important parameter as it indicates the rotational speed of the engine, which directly affects the fuel flow rate and power output. The pneumatic thermostat air pressure is used to regulate the load on the engine, ensuring that it operates within the desired parameters. By monitoring and adjusting these signals, the fuel control unit can effectively control the engine's performance.

Explanation

The fuel control unit on a GTCP 165 engine uses engine speed and pneumatic thermostat (load control) air pressure to control engine operation. Engine speed is an important parameter as it indicates the rotational speed of the engine, which directly affects the fuel flow rate and power output. The pneumatic thermostat air pressure is used to regulate the load on the engine, ensuring that it operates within the desired parameters. By monitoring and adjusting these signals, the fuel control unit can effectively control the engine's performance.

71. Which two cams on the alpha shaft control the 54H60–117 propeller unfeathering operation?

Speed set and beta follow-up.

Manual feather and beta set.

Speed set and pressure cutout backup switch.

Manual feather and pressure cutout backup switch.

The correct answer is Manual feather and beta set. The 54H60-117 propeller unfeathering operation is controlled by two cams on the alpha shaft, namely the Manual feather and beta set. These cams work together to initiate and control the unfeathering process of the propeller. The Manual feather cam allows the pilot to manually initiate the unfeathering operation, while the beta set cam adjusts the propeller blade angle to the desired position for unfeathering.

Explanation

The correct answer is Manual feather and beta set. The 54H60-117 propeller unfeathering operation is controlled by two cams on the alpha shaft, namely the Manual feather and beta set. These cams work together to initiate and control the unfeathering process of the propeller. The Manual feather cam allows the pilot to manually initiate the unfeathering operation, while the beta set cam adjusts the propeller blade angle to the desired position for unfeathering.

72. During beta range operation on the 54H60–117 propeller, which cam's rotation moves the mechanical linkage to center the governor pilot valve?

Beta set.

Speed set.

Backup valve.

Beta follow-up.

During beta range operation on the 54H60-117 propeller, the rotation of the beta follow-up cam moves the mechanical linkage to center the governor pilot valve.

Explanation

During beta range operation on the 54H60-117 propeller, the rotation of the beta follow-up cam moves the mechanical linkage to center the governor pilot valve.

73. Which valve is a backup in case the feather valve fails during feathering operation on the 54H60–117 propeller?

Pilot.

Feather solenoid.

Feather actuating.

Standby pump check.

The feather solenoid is the backup valve in case the feather valve fails during feathering operation on the 54H60-117 propeller. The feather solenoid is responsible for controlling the flow of hydraulic fluid to the feather valve, which is used to change the pitch of the propeller blades. If the feather valve fails, the feather solenoid can be activated to ensure that the propeller blades can still be feathered properly.

Explanation

The feather solenoid is the backup valve in case the feather valve fails during feathering operation on the 54H60-117 propeller. The feather solenoid is responsible for controlling the flow of hydraulic fluid to the feather valve, which is used to change the pitch of the propeller blades. If the feather valve fails, the feather solenoid can be activated to ensure that the propeller blades can still be feathered properly.

74. Which switch has a spring-loaded guard to hold it in the NORMAL position?

Propeller governor control.

Synchrophaser disarming.

Prop resynchrophase.

Synchrophase master.

The correct answer is Propeller governor control. The reason for this is that a propeller governor control switch typically has a spring-loaded guard that holds it in the NORMAL position. This guard ensures that the switch remains in the desired position and prevents accidental movement or changes.

Explanation

The correct answer is Propeller governor control. The reason for this is that a propeller governor control switch typically has a spring-loaded guard that holds it in the NORMAL position. This guard ensures that the switch remains in the desired position and prevents accidental movement or changes.

75. In the beta range of the 54H60–117 propeller, which cam increases the speeder spring tension?

Beta set.

Speed set.

Backup valve.

Beta follow-up.

In the beta range of the 54H60-117 propeller, the cam that increases the speeder spring tension is the "Speed set" cam. This cam is responsible for adjusting the propeller blade pitch, which in turn affects the speed of the propeller. By increasing the tension of the speeder spring, the speed set cam can control the pitch of the propeller blades and ultimately increase the speed of the propeller.

Explanation

In the beta range of the 54H60-117 propeller, the cam that increases the speeder spring tension is the "Speed set" cam. This cam is responsible for adjusting the propeller blade pitch, which in turn affects the speed of the propeller. By increasing the tension of the speeder spring, the speed set cam can control the pitch of the propeller blades and ultimately increase the speed of the propeller.

76. 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?

High pressure relief.

Feather actuating.

Feather.

Pilot.

During negative torque conditions, the main, standby, and auxiliary pressure pumps' output is connected to the increase pitch lines through the feather valve on the 54H60-117 propeller. This allows the blades to be feathered, which means they are rotated to a high pitch angle to minimize drag and maximize efficiency when the engine is not producing power. The feather valve controls the flow of hydraulic fluid to the increase pitch lines, enabling the blades to be feathered.

Explanation

During negative torque conditions, the main, standby, and auxiliary pressure pumps' output is connected to the increase pitch lines through the feather valve on the 54H60-117 propeller. This allows the blades to be feathered, which means they are rotated to a high pitch angle to minimize drag and maximize efficiency when the engine is not producing power. The feather valve controls the flow of hydraulic fluid to the increase pitch lines, enabling the blades to be feathered.

77. The modulating and shutoff valve on a GTCP 165 engine will be fully open at what percent rpm?

60

70

80

90

The modulating and shutoff valve on a GTCP 165 engine will be fully open at 90% rpm.

Explanation

The modulating and shutoff valve on a GTCP 165 engine will be fully open at 90% rpm.

78. On a GTCP 165 engine, the accessory drive section aft housing contains the

Fuel control unit.

Oil pump assembly.

Vane-axial fan assembly.

Compressor front shaft bearing.

The correct answer is "compressor front shaft bearing." The accessory drive section aft housing contains the compressor front shaft bearing, which is responsible for supporting the front shaft of the compressor. This bearing helps to reduce friction and ensure smooth rotation of the compressor, which is crucial for the engine's operation. The other options mentioned, such as the fuel control unit, oil pump assembly, and vane-axial fan assembly, are not located in the accessory drive section aft housing.

Explanation

The correct answer is "compressor front shaft bearing." The accessory drive section aft housing contains the compressor front shaft bearing, which is responsible for supporting the front shaft of the compressor. This bearing helps to reduce friction and ensure smooth rotation of the compressor, which is crucial for the engine's operation. The other options mentioned, such as the fuel control unit, oil pump assembly, and vane-axial fan assembly, are not located in the accessory drive section aft housing.

79. During load control system operation on a GTCP 165 engine, the pneumatic thermostat is used to

Allow for stall-free engine acceleration.

Prevent engine exhaust over-temperature.

Measure the compressor exit air temperature.

Measure the compressor inlet (ambient) air temperature.

The pneumatic thermostat is used during load control system operation on a GTCP 165 engine to prevent engine exhaust over-temperature. This means that the thermostat is responsible for regulating the temperature of the engine exhaust to ensure that it does not exceed safe limits. By preventing over-temperature, the thermostat helps to maintain the engine's performance and prevent any potential damage or failures that could occur due to excessive heat.

Explanation

The pneumatic thermostat is used during load control system operation on a GTCP 165 engine to prevent engine exhaust over-temperature. This means that the thermostat is responsible for regulating the temperature of the engine exhaust to ensure that it does not exceed safe limits. By preventing over-temperature, the thermostat helps to maintain the engine's performance and prevent any potential damage or failures that could occur due to excessive heat.