CDC Volume 4 Edit Code 2

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CDC Volume 4 Edit Code 2 - Quiz


Questions and Answers
  • 1. 

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

    • A.

      Barrel.

    • B.

      Control.

    • C.

      Low pitch stop.

    • D.

      Pitchlock regulator.

    Correct Answer
    A. Barrel.
    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.

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  • 2. 

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

    • A.

      Dome.

    • B.

      Barrel.

    • C.

      Control.

    • D.

      Front spinner.

    Correct Answer
    B. Barrel.
    Explanation
    The barrel carries high centrifugal loads created by the propeller blades.

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  • 3. 

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

    • A.

      Microadjusting ring.

    • B.

      Beta feedback shaft.

    • C.

      Blade segment gear.

    • D.

      Blade bushing.

    Correct Answer
    B. 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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  • 4. 

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

    • A.

      Pitchlock control cam.

    • B.

      Pitchlock ratchet piston.

    • C.

      Externally threaded ring.

    • D.

      Externally splined spacer ring.

    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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  • 5. 

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

    • A.

      Slip rings.

    • B.

      Microadjusting ring.

    • C.

      Roller thrust bearing.

    • D.

      Beveled thrust washer.

    Correct Answer
    D. 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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  • 6. 

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

    • A.

      Roller shaft.

    • B.

      Track slopes

    • C.

      Ball bearings.

    • D.

      Roller bearings.

    Correct Answer
    C. 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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  • 7. 

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

    • A.

      Rotating pitchlock ratchet.

    • B.

      Low pitch stop.

    • C.

      Stationary cam.

    • D.

      Stop ring.

    Correct Answer
    D. 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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  • 8. 

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

    • A.

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

    • B.

      Limits cam travel and prevents the propeller from exceeding feather and reverse blade angles.

    • C.

      Prevents the blades from decreasing pitch if an overspeed condition occurs.

    • D.

      Transmits engine torque to the blades.

    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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  • 9. 

    On the 54H60–117 propeller, which component’s purpose is to provide electrical circuits between the brush block assembly and the deicing elements of the blade assemblies?

    • A.

      Control assembly.

    • B.

      Front spinner section.

    • C.

      Hub mounting bulkhead.

    • D.

      Deicer contact ring holder.

    Correct Answer
    D. 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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  • 10. 

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

    • A.

      Main pressure and main scavenge.

    • B.

      Standby pressure and main scavenge.

    • C.

      Auxiliary pressure and main pressure.

    • D.

      Auxiliary pressure and auxiliary scavenge.

    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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  • 11. 

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

    • A.

      Main pressure.

    • B.

      Main scavenge.

    • C.

      Standby pressure and main scavenge.

    • D.

      Auxiliary pressure and auxiliary scavenge.

    Correct Answer
    D. 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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  • 12. 

    On the 54H60–117 propeller, which cam disarms the NTS system linkage when the throttle is positioned in the beta range?

    • A.

      Manual feather.

    • B.

      Beta follow-up.

    • C.

      Speed set.

    • D.

      Beta set.

    Correct Answer
    A. Manual feather.
    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.

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  • 13. 

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

    • A.

      Beta set.

    • B.

      Beta follow-up.

    • C.

      Beta shaft rigging.

    • D.

      Alpha shaft rigging.

    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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  • 14. 

    On the 54H60–117 propeller, which valve connects the main, standby, and auxiliary pressure pumps’ output to the increase pitch lines during negative torque conditions?

    • A.

      High pressure relief.

    • B.

      Feather actuating.

    • C.

      Feather.

    • D.

      Pilot.

    Correct Answer
    C. Feather.
    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.

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  • 15. 

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

    • A.

      High pressure relief.

    • B.

      Feather actuating.

    • C.

      Standby.

    • D.

      Backup.

    Correct Answer
    B. 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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  • 16. 

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

    • A.

      Beta indicator.

    • B.

      Pressure cutout.

    • C.

      NTS.

    • D.

      PCBS.

    Correct Answer
    D. 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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  • 17. 

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

    • A.

      104 to 108%

    • B.

      114 to 118%.

    • C.

      99 to 103%.

    • D.

      109 to 113%.

    Correct Answer
    D. 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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  • 18. 

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

    • A.

      Check.

    • B.

      Bypass.

    • C.

      Low pressure relief.

    • D.

      High pressure relief.

    Correct Answer
    B. 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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  • 19. 

    On the 54H60–117 propeller, when the backup valve is opened, the hydraulic pressure routed to the governor pilot valve is used for which operation?

    • A.

      Pitchlock.

    • B.

      Standby.

    • C.

      Reverse.

    • D.

      Airstart.

    Correct Answer
    C. 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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  • 20. 

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

    • A.

      Main.

    • B.

      Backup.

    • C.

      Standby.

    • D.

      Auxiliary.

    Correct Answer
    D. 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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  • 21. 

    On the 54H60–117 propeller, which type of valve opens to allow the output of the standby pump to combine with the output of the main pump?

    • A.

      Check.

    • B.

      Bypass.

    • C.

      Low pressure relief.

    • D.

      High pressure relief.

    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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  • 22. 

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

    • A.

      Atmospheric sump.

    • B.

      Pressurized sump.

    • C.

      Dome assembly.

    • D.

      Pilot valve.

    Correct Answer
    B. 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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  • 23. 

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

    • A.

      Spiral bending.

    • B.

      Thrust bending.

    • C.

      Centrifugal twisting moment.

    • D.

      Aerodynamic twisting moment.

    Correct Answer
    C. 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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  • 24. 

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

    • A.

      Loss of oil pressure.

    • B.

      Flow of hydraulic fluid to the pilot valve.

    • C.

      An engine overspeed due to a loss of power.

    • D.

      Engine overspeed due to a loss of hydraulic pressure.

    Correct Answer
    D. 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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  • 25. 

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

    • A.

      Loss of hydraulic pressure.

    • B.

      The pitchlock control cam.

    • C.

      An overspeed in excess of 103.5%.

    • D.

      Increase- or decrease pitch pressure.

    Correct Answer
    B. The pitchlock control cam.
    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°.

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  • 26. 

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

    • A.

      Loss of hydraulic pressure.

    • B.

      The pitchlock control cam.

    • C.

      An overspeed in excess of 103.5%.

    • D.

      Increase- or decrease pitch pressure.

    Correct Answer
    D. Increase- or decrease pitch pressure.
    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.

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  • 27. 

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

    • A.

      Hydraulic pressure.

    • B.

      Movable wedge.

    • C.

      Dome piston.

    • D.

      Servo valve.

    Correct Answer
    B. 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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  • 28. 

    When pressure builds to between 240 and 280 psi on the 54H60–117 propeller, which valve is unseated and allows the stop levers to retract?

    • A.

      Servo.

    • B.

      Backup.

    • C.

      Governor pilot.

    • D.

      Low pressure relief.

    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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  • 29. 

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

    • A.

      Propeller blade pitch and engine fuel flow.

    • B.

      Propeller blade pitch and temperature limiting.

    • C.

      Engine fuel flow and constant speed governing.

    • D.

      Temperature limiting and constant speed governing.

    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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  • 30. 

    Constant speed can only occur when the throttle is positioned from

    • A.

      RVS to FLT IDLE.

    • B.

      RVS to GND IDLE.

    • C.

      GND IDLE to FLT IDLE.

    • D.

      FLT IDLE to TAKE OFF.

    Correct Answer
    D. 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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  • 31. 

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

    • A.

      34 to 90.

    • B.

      18 to 90.

    • C.

      0 to 34.

    • D.

      0 to 18.

    Correct Answer
    C. 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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  • 32. 

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

    • A.

      Cams and mechanical linkage.

    • B.

      Flyweights and speeder spring.

    • C.

      Hydraulic pressure.

    • D.

      Throttle.

    Correct Answer
    A. Cams and mechanical linkage.
    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.

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  • 33. 

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

    • A.

      Beta set.

    • B.

      Speed set.

    • C.

      Backup valve.

    • D.

      Beta follow-up.

    Correct Answer
    B. Speed set.
    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.

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  • 34. 

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

    • A.

      Beta set.

    • B.

      Speed set.

    • C.

      Backup valve.

    • D.

      Beta follow-up.

    Correct Answer
    D. Beta follow-up.
    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.

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  • 35. 

    During alpha range operation on the 54H60–117 propeller, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent engine speed?

    • A.

      Beta set.

    • B.

      Speed set.

    • C.

      Backup valve.

    • D.

      Beta follow-up.

    Correct Answer
    B. 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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  • 36. 

    During an overspeed condition in the alpha range on the 54H60–117 propeller, the flyweights move the governor pilot valve to meter hydraulic fluid, which will

    • A.

      Increase blade angle.

    • B.

      Decrease blade angle.

    • C.

      Engage the low pitch stop.

    • D.

      Engage the pitchlock ratchets.

    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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  • 37. 

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

    • A.

      Hydraulic fluid flow to the dome assembly is increased.

    • B.

      Blades are moved to the feather position.

    • C.

      Propeller starts to underspeed.

    • D.

      System is back on-speed.

    Correct Answer
    D. 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. 

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

    • A.

      Decreased hydraulic pressure.

    • B.

      Increased hydraulic pressure.

    • C.

      Speeder spring.

    • D.

      Flyweights.

    Correct Answer
    C. 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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  • 39. 

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

    • A.

      Throttle.

    • B.

      Beta shaft.

    • C.

      Pilot valve.

    • D.

      Manual feather cam.

    Correct Answer
    D. 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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  • 40. 

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

    • A.

      Aft end of the dome piston.

    • B.

      Forward end of the dome piston.

    • C.

      Decrease-pitch side of the pilot valve.

    • D.

      Increase-pitch side of the pilot valve.

    Correct Answer
    B. 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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  • 41. 

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

    • A.

      Pilot.

    • B.

      Feather solenoid.

    • C.

      Feather actuating.

    • D.

      Standby pump check.

    Correct Answer
    B. Feather solenoid.
    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.

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  • 42. 

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

    • A.

      Pilot.

    • B.

      Feather.

    • C.

      Feather solenoid.

    • D.

      Standby pump check.

    Correct Answer
    C. Feather solenoid.
    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.

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  • 43. 

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

    • A.

      Feather.

    • B.

      Standby check.

    • C.

      Feather solenoid.

    • D.

      Feather actuating.

    Correct Answer
    D. Feather actuating.
    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.

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  • 44. 

    During feather operation on the 54H60–117 propeller, what range in pounds per square inch (psi) of fluid pressure opens the pressure cutout switch contacts?

    • A.

      0 to 200.

    • B.

      300 to 500.

    • C.

      600 to 800.

    • D.

      900 to 1,100.

    Correct Answer
    C. 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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  • 45. 

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

    • A.

      Feather relay.

    • B.

      Feather solenoid.

    • C.

      Pressure cutout switch.

    • D.

      Pressure cutout backup switch (PCBS).

    Correct Answer
    C. Pressure cutout switch.
    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.

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  • 46. 

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

    • A.

      Any throttle position.

    • B.

      Above FLT IDLE.

    • C.

      At TAKE OFF.

    • D.

      At GND IDLE.

    Correct Answer
    B. 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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  • 47. 

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

    • A.

      Speed set and beta follow-up.

    • B.

      Manual feather and beta set.

    • C.

      Speed set and pressure cutout backup switch.

    • D.

      Manual feather and pressure cutout backup switch.

    Correct Answer
    B. Manual feather and beta set.
    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.

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  • 48. 

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

    • A.

      200

    • B.

      400

    • C.

      600

    • D.

      800

    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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  • 49. 

    On the 54H60–117 propeller, after the NTS system actuator rod positions the mechanical linkage in the valve housing when a negative torque condition occurs, what component is shifted?

    • A.

      Pilot valve.

    • B.

      Beta set cam.

    • C.

      Speed set cam.

    • D.

      Feather actuating valve.

    Correct Answer
    D. 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.

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  • 50. 

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

    • A.

      Keeps the propellers rotating at the same speed.

    • B.

      Keeps the propellers rotating at different speeds.

    • C.

      Prevents the pilot valve from shifting to increase blade angle.

    • D.

      Prevents the pilot valve from shifting to decrease blade angle.

    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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