2A6X1 Vol. 4 Ure's (Mfe)

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2A6X1 Vol. 4 Ure

Vol 4 study guide


Questions and Answers
  • 1. 

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

    • A.

      Barrel

    • B.

      Control

    • C.

      Low pitch stop

    • D.

      Pitchlock requlator

    Correct Answer
    A. Barrel
    Explanation
    The barrel of a 54H60-91 propeller subassembly transmits engine torque to the propeller blades.

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  • 2. 

    On the 54H60-91 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 on the 54H60-91 propeller. This component allows for the adjustment and control of the propeller blade angle, ensuring optimal performance and efficiency.

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  • 3. 

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

    • A.

      Stops the dome piston from increasing blade angle above 23.3

    • B.

      Prevents the blades from decreasing pitch if hydraulic pressure is lost

    • C.

      Prevents cam bearing rollers from bottoming out in the track slopes

    • D.

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

    Correct Answer
    B. Prevents the blades from decreasing pitch if hydraulic pressure is lost
    Explanation
    The function of the pitchlock regulator on the 54H60-91 propeller is to prevent the blades from decreasing pitch if hydraulic pressure is lost. This means that even if there is a loss of hydraulic pressure, the pitchlock regulator will ensure that the blades maintain their pitch and do not move to a lower angle. This is important for the safe operation of the propeller, as a sudden decrease in pitch could result in a loss of thrust and control.

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  • 4. 

    On the 54H60-91 propeller, which pitchlock component mechanically holds the stationary and rotating pitchlock ratchets apart during reversing adn unfeatherin 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 54H60-91 propeller.

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  • 5. 

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

    • A.

      Beveled thrust washer

    • B.

      Stationary ratchet

    • C.

      Beta segment gear

    • D.

      Blade barrel shim

    Correct Answer
    C. Beta segment gear
    Explanation
    The beta segment gear is used in place of a shim plate on the No. 1 blade of the 54H60-91 propeller. This component serves the purpose of adjusting the pitch angle of the blade. A shim plate is typically used to achieve this adjustment, but in this case, the beta segment gear is utilized instead.

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  • 6. 

    On the 54H60-91 propeller, which dome assembly part allow the rotating cam to turn while the stationary cam remains in a fixed postion?

    • A.

      Roller shaft

    • B.

      Track slopes

    • C.

      Ball bearings

    • D.

      Roller bearings

    Correct Answer
    C. Ball bearings
    Explanation
    Ball bearings allow the rotating cam to turn while the stationary cam remains in a fixed position. Ball bearings are designed to reduce friction and allow smooth rotation between two parts. In this case, the ball bearings enable the rotating cam to spin freely while the stationary cam remains fixed, ensuring proper functioning of the 54H60-91 propeller.

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  • 7. 

    On the 54H60-91 propeller, what function is a task of the low pitch stop assembly?

    • A.

      Prevents the popeller from goin in to 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 balde 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 popeller from goin in to the beta range when the throttle is positioned in the alpha range
    Explanation
    The low pitch stop assembly on the 54H60-91 propeller prevents the propeller from going into the beta range when the throttle is positioned in the alpha range. This means that it restricts the propeller blades from moving to a higher pitch angle, ensuring that the propeller operates within the desired range and does not enter a mode where it provides reverse thrust.

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  • 8. 

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

    • A.

      Deicer cnotact ring holder

    • B.

      Hub mounting bulkhead

    • C.

      Front spinner

    • D.

      Afterbody

    Correct Answer
    B. Hub mounting bulkhead
    Explanation
    The hub mounting bulkhead provides a means for balancing the propeller on the 54H60-91 propeller. Balancing the propeller is important to ensure smooth and efficient operation. The hub mounting bulkhead is responsible for securely attaching the propeller blades to the hub and distributing the weight evenly. This helps to minimize vibrations and maintain proper alignment, resulting in optimal performance of the propeller.

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  • 9. 

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

    • A.

      Valve housing

    • B.

      Low pich stop

    • C.

      Transfer bearing

    • D.

      Pitchlock regulator

    Correct Answer
    C. Transfer bearing
    Explanation
    The correct answer is transfer bearing. On the 54H60-91 propeller, hydraulic fluid is directed from the pump housing to the barrel assembly through the transfer bearing. This component plays a crucial role in transferring the hydraulic fluid and ensuring the proper functioning of the propeller system.

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  • 10. 

    on the 54H60-91 popeller, what is the function of the differential gear train assembly?

    • A.

      Drives the main and standby pressure pumps

    • B.

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

    • C.

      Drives the rotation sleeve when the throttle is positioned in the beta range

    • D.

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

    Correct Answer
    D. Transmits blade angle movement to the valve housin and drives the propeller governor flyweights
    Explanation
    The function of the differential gear train assembly on the 54H60-91 propeller is to transmit the blade angle movement to the valve housing and drive the propeller governor flyweights. This allows for the adjustment of the blade angle and the regulation of the propeller speed and pitch.

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  • 11. 

    On the 54H60-91 propeller, during normal porpeller 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 54H60-91 propeller, the output of the main pressure and main scavenge pumps is used. These pumps are responsible for providing the necessary pressure and scavenging functions to ensure proper operation of the propeller. The main pressure pump supplies hydraulic pressure to control the pitch of the propeller blades, while the main scavenge pump removes any excess oil or debris from the propeller system. Both pumps play a crucial role in maintaining the efficiency and functionality of the propeller during normal operation.

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  • 12. 

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

    • A.

      Main scavenge

    • B.

      Standby pressure

    • C.

      Auxiliary pressure

    • D.

      Auxiliary scavenge

    Correct Answer
    B. Standby pressure
    Explanation
    The standby pressure pump assists the main pressure pump on the 54H60-91 propeller when large blade angle movements are required. This pump helps to maintain the necessary pressure for the propeller system to function properly during these movements.

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  • 13. 

    On the 54H60-91 propeller, which cam disarms the NTS system linkage when the throttle is positioned in teh 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 54H60-91 propeller, the manual feather cam is responsible for disarming the NTS (negative torque sensing) system linkage when the throttle is positioned in the beta range. This allows the propeller to be manually feathered, which means adjusting the blades to a high pitch angle to minimize drag and increase efficiency. The manual feather cam ensures that the NTS system does not interfere with this manual control of the propeller.

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  • 14. 

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

    • A.

      Standby

    • B.

      Feather

    • C.

      Backup

    • D.

      Pilot

    Correct Answer
    D. Pilot
    Explanation
    The pilot valve, contained in the valve housing, controls the flow of hydraulic fluid to and from the dome assembly on the 54H60-91 propeller.

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  • 15. 

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

    • A.

      99 to 103%

    • B.

      104 to 108%

    • C.

      109 to 113%

    • D.

      114 to 118%

    Correct Answer
    C. 109 to 113%
    Explanation
    The correct answer is 109 to 113%. The 54H60-91 propeller governor speeder spring tension is responsible for positioning the pilot valve, which in turn maintains the RPM (rotations per minute) in the beta range. This particular spring tension ensures that the RPM stays within the range of 109 to 113%, allowing for optimal performance and control of the propeller.

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  • 16. 

    On the 54H60-91 propeller, when the throttle is moved to the GROUND IDLE position, what degree setting does the coordinator pointer indicate on the protractor?

    • A.

      0*

    • B.

      18*

    • C.

      34*

    • D.

      90*

    Correct Answer
    B. 18*
    Explanation
    When the throttle is moved to the GROUND IDLE position on the 54H60-91 propeller, the coordinator pointer indicates a degree setting of 18* on the protractor.

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  • 17. 

    Which switch, located in the control quadrant, activates the 54h-60-91 propeller governor speed bias servo assebly as the throttle is moved into the blight idle gate?

    • A.

      Beta indicator

    • B.

      Landing gear warning

    • C.

      Low speed ground idle

    • D.

      Synchrophaser disarming

    Correct Answer
    D. Synchrophaser disarming
    Explanation
    The correct answer is "synchrophaser disarming". The synchrophaser is a device that synchronizes the propellers on a multi-engine aircraft to prevent vibration and improve performance. When the throttle is moved into the flight idle gate, the synchrophaser needs to be disarmed to allow the propeller governor speed bias servo assembly to activate and control the propeller speed. Therefore, the switch located in the control quadrant that activates the synchrophaser disarming is the one that is relevant in this situation.

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  • 18. 

    The condition lever GND STOP position is only effective on the ground because the circuits made in this position are completed throw what switches?

    • A.

      Landing gear touchdown

    • B.

      Low speed ground idle

    • C.

      Landing gear warning

    • D.

      Air start

    Correct Answer
    A. Landing gear touchdown
    Explanation
    The condition lever GND STOP position is only effective on the ground because the circuits made in this position are completed through the landing gear touchdown switch. This switch is activated when the aircraft's landing gear makes contact with the ground, allowing the condition lever to be moved to the GND STOP position. This position cuts off fuel flow to the engine, preventing it from running while the aircraft is on the ground.

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  • 19. 

    What component in the T56 engine coordinator provides reference signals to the electronic TD amplifier that are proportional to the desired TIT?

    • A.

      Feather shaft

    • B.

      Potentiomether

    • C.

      65* microswitch

    • D.

      66* microswitch

    Correct Answer
    B. Potentiomether
    Explanation
    The potentiometer in the T56 engine coordinator provides reference signals to the electronic TD amplifier that are proportional to the desired TIT. A potentiometer is a variable resistor that can adjust the voltage or current in a circuit. In this case, it is used to control the temperature of the engine by providing signals to the TD amplifier, which adjusts the TIT accordingly.

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  • 20. 

    on the 54H60-91 propeller, the output of what pump is sufficient to supply hydraulic pressure for nomal propeller operation?  

    • A.

      Auxiliary pressure

    • B.

      Standby pressure

    • C.

      Backkup pressure

    • D.

      Main pressure

    Correct Answer
    D. Main pressure
    Explanation
    The correct answer is "main pressure". On the 54H60-91 propeller, the main pressure pump is responsible for supplying hydraulic pressure for normal propeller operation. This pump is designed to provide sufficient pressure to ensure the propeller functions properly. The auxiliary pressure, standby pressure, and backup pressure pumps may be used in certain situations, but the main pressure pump is the primary source of hydraulic pressure for the propeller.

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  • 21. 

    On the 54H60-91 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 54H60-91 propeller, the bypass valve opens to assure continued flow. This valve allows the fluid to bypass the clogged filter and continue flowing through the system, preventing any disruption or damage to the propeller.

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  • 22. 

    On the 54H60-91 propeller, which valve sets and maintains a pressure differential of about 100 psi between system pressure and the increase- or decrease-pitch pressure?

    • A.

      Check

    • B.

      Bypass

    • C.

      Low-pressure relief

    • D.

      High-pressure relief

    Correct Answer
    C. Low-pressure relief
    Explanation
    The low-pressure relief valve is responsible for setting and maintaining a pressure differential of about 100 psi between system pressure and the increase or decrease pitch pressure on the 54H60-91 propeller. This valve ensures that the pressure remains at the desired level, preventing any potential damage or malfunction that could occur if the pressure exceeds the specified limit.

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  • 23. 

    On the 54H60-91 propeller, when the backup valve is opened, the hydraulic pressure routed to the governoor 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 54H60-91 propeller, the hydraulic pressure routed to the governor pilot valve is used for the operation of reversing the propeller. This means that the propeller blades can be adjusted to produce reverse thrust, allowing the aircraft to slow down or stop more effectively during landing or taxiing.

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  • 24. 

    On the 54H60-91 propeller, which 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 pump is used to feather or unfeather the propeller during static propeller operation on the 54H60-91 propeller.

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  • 25. 

    On the 54H60-91 propeller, which type of valve opens to allow the output of the standby pump to combine with the output of the main pump?

    • A.

      Check

    • B.

      Bypass

    • C.

      Low pressure relief

    • D.

      High pressure relief

    Correct Answer
    A. Check
    Explanation
    The correct answer is "check". In a 54H60-91 propeller, the check valve opens to allow the output of the standby pump to combine with the output of the main pump. The check valve is designed to allow flow in one direction and prevent backflow in the opposite direction. In this case, it allows the output of the standby pump to flow into the system when needed, ensuring a combined output of both pumps.

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  • 26. 

    The purpose fo the 54H60-91 propeller pitchlock assembly is to prevent

    • A.

      The loss of oil pressure

    • B.

      An engine overspedd due to a loss of power

    • C.

      The flow of hydraulic fluid to the pilot valve

    • D.

      An engine ovespeed due to a loss fo hydraulic pressure

    Correct Answer
    D. An engine ovespeed due to a loss fo hydraulic pressure
    Explanation
    The purpose of the 54H60-91 propeller pitchlock assembly is to prevent an engine overspeed due to a loss of hydraulic pressure. This means that if there is a loss of hydraulic pressure, the propeller pitchlock assembly will engage and prevent the propeller from spinning too fast, which could cause damage to the engine. This safety mechanism ensures that the engine operates within its safe speed limits even in the event of a hydraulic pressure loss.

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  • 27. 

    On the 54H60-91 propeller, what prevents engagement of the stationary and rotating retchets at blade angles below 25* and above 55*?

    • A.

      An overspeed of 103.5%

    • B.

      The pitchlock control cam

    • C.

      A loss fo hydrulic pressure

    • 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 at blade angles below 25* and above 55*.

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  • 28. 

    On the 54H60-91 propeller, between the blade angles of 25* and 55*, what will keep the rotation and stationary ratchets disengaged?

    • A.

      An overspeed of 103.5%

    • B.

      The pitchlock control cam

    • C.

      A loss fo hydrulic pressure

    • D.

      Increase- or decrease pitch pressure

    Correct Answer
    D. Increase- or decrease pitch pressure
    Explanation
    To keep the rotation and stationary ratchets disengaged between the blade angles of 25* and 55* on the 54H60-91 propeller, the pitch pressure needs to be adjusted. Increasing or decreasing the pitch pressure will ensure that the ratchets remain disengaged. This adjustment allows for proper functioning of the propeller and prevents any unwanted engagement of the ratchets during operation.

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  • 29. 

    On the 54H60-91 propeller, the funcition  of the low pitch stop is to prevent the

    • A.

      Propeller barrel from decreasing blade angle below 23.3* +_ .5*

    • B.

      Dome piston from decresing blade angle below 23.3* +_ .5*

    • C.

      Propeller barrel from decreasing blade angle below 34* +_ .5*

    • D.

      Dome piston from dereasing blade angle below 34* +_ .5*

    Correct Answer
    B. Dome piston from decresing blade angle below 23.3* +_ .5*
    Explanation
    The low pitch stop on the 54H60-91 propeller is responsible for preventing the dome piston from decreasing the blade angle below 23.3° ± 0.5°. This is important because it ensures that the propeller maintains a minimum blade angle, which is necessary for optimal performance and efficiency. By limiting the range of motion for the dome piston, the low pitch stop helps to regulate the propeller's pitch and control the amount of thrust generated.

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  • 30. 

    On the 54H60-91 propeller, what forces the stop levers on the low pitch stop to move outward?

    • A.

      Wedge

    • B.

      Servo valve

    • C.

      Dome piston

    • D.

      Hydraulic pressure

    Correct Answer
    A. Wedge
    Explanation
    The stop levers on the low pitch stop of the 54H60-91 propeller move outward due to the action of a wedge.

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  • 31. 

    On the 54H60-91 propeller, when pessure builds to between 240 adn 280 psi, which valve is unseated and allows the stop levers to retract?

    • A.

      Low pressure relief

    • B.

      Governor pilot

    • C.

      Backup

    • D.

      Servo

    Correct Answer
    D. Servo
    Explanation
    When pressure builds to between 240 and 280 psi on the 54H60-91 propeller, the servo valve is unseated and allows the stop levers to retract.

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  • 32. 

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

    • A.

      Blade pitch and engine fuel flow

    • B.

      Blade pitch and temperature limiting

    • C.

      Engine fuel flow and constant speed governing

    • D.

      Temperature limiting and constant speed governing

    Correct Answer
    A. Blade pitch and engine fuel flow
    Explanation
    The throttle in the controllable pitch range is responsible for coordinating the blade pitch and engine fuel flow. The throttle controls the amount of fuel being delivered to the engine, which in turn affects the engine speed. The blade pitch, on the other hand, controls the angle of the blades, determining the amount of lift and thrust generated. By coordinating the blade pitch and engine fuel flow, the throttle ensures that the engine operates at the desired speed and the blades are adjusted for optimal performance.

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  • 33. 

    On the 54H60-91 propeller, during beta range operation, what moves the pilot valve?

    • A.

      Throttle

    • B.

      Hydraulic pressure

    • C.

      Cams adn mechanical linkage

    • D.

      Flyweights and speeder spring

    Correct Answer
    C. Cams adn mechanical linkage
    Explanation
    The pilot valve on the 54H60-91 propeller is moved by cams and mechanical linkage during beta range operation. This means that the movement of the valve is controlled by a system of cams and mechanical linkages, rather than by the throttle or hydraulic pressure. The cams and mechanical linkage system is designed to regulate the movement of the pilot valve in order to control the propeller pitch and optimize performance during beta range operation.

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  • 34. 

    On the 54H60-91 propeller, during beta range operation, the rotation of which cam moves the mechanical linkage to center the governor pilot valve?

    • A.

      Beta set

    • B.

      Speed set

    • C.

      Backup balve

    • D.

      Beta follow-up

    Correct Answer
    D. Beta follow-up
    Explanation
    During beta range operation, the rotation of the beta follow-up cam moves the mechanical linkage to center the governor pilot valve. This ensures that the propeller is properly controlled and maintains the desired pitch angle. The beta follow-up cam is specifically designed to adjust the position of the governor pilot valve based on the propeller's beta range operation.

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  • 35. 

    On the 54H60-91 propeller, during alpha range operation, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent rpm?

    • 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". On the 54H60-91 propeller, the speed set cam is responsible for changing the speeder spring tension. This adjustment allows the governor pilot valve to maintain 100 percent RPM during alpha range operation. The speed set cam ensures that the propeller operates at the desired speed, providing optimal performance.

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  • 36. 

    On the 54H60-91 propeller, during an underspeed condition, what moves the pilot valve?

    • A.

      Decreased hydraulic pressure

    • B.

      Increased hydraulic pressure

    • C.

      Speeder spring

    • D.

      Flyweights

    Correct Answer
    C. Speeder spring
    Explanation
    During an underspeed condition on the 54H60-91 propeller, the speeder spring moves the pilot valve. The purpose of the speeder spring is to maintain a constant propeller speed by adjusting the pitch of the propeller blades. When the propeller speed decreases below the desired level, the speeder spring activates and moves the pilot valve to increase hydraulic pressure, adjusting the pitch and increasing the propeller speed back to the desired level.

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  • 37. 

    On the 54H60-91 propeller, when feathering the 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 propeller on the 54H60-91 propeller, the mechanical linkage is acted upon by the manual feather cam to open the feather actuating valve. The manual feather cam is responsible for controlling the movement of the mechanical linkage, allowing it to activate the feather actuating valve and initiate the feathering process.

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  • 38. 

    On the 54H60-91 propeller, during 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.

      Decreased-pitch side of the pilot valve

    • D.

      Increased-pitch side of the pilot valve

    Correct Answer
    B. Forward end of the dome piston
    Explanation
    During the feathering operation of the 54H60-91 propeller, the feather valve is positioned to meter hydraulic fluid to the forward end of the dome piston. This is because when the propeller is being feathered, the blades need to be rotated to a high pitch angle to minimize drag. By metering hydraulic fluid to the forward end of the dome piston, it allows the blades to rotate to this high pitch angle, effectively feathering the propeller.

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  • 39. 

    On the 54H60-91 propeller, which valve is a backup in case the feather valve fails during feathering operation?

    • A.

      Pilot

    • B.

      Feather solenoid

    • C.

      Feather actuating

    • D.

      Standby pump check

    Correct Answer
    A. Pilot
    Explanation
    The pilot valve is a backup in case the feather valve fails during feathering operation. It is responsible for controlling the flow of hydraulic fluid to the feather actuating cylinder, which is necessary for feathering the propeller. If the feather valve fails, the pilot valve can be used to manually operate the feathering process and ensure that the propeller is properly feathered.

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  • 40. 

    As the 54H60-91 propeller feathers, the output of which pump decreases (drops off)?

    • A.

      Auxiliary pressure

    • B.

      Auxiliary scavenge

    • C.

      Main scavenge

    • D.

      Feather

    Correct Answer
    C. Main scavenge
    Explanation
    The main scavenge pump is responsible for removing excess oil from the propeller system. When the 54H60-91 propeller feathers, it means that the blades are rotated to an angle that minimizes drag. This action requires the oil to be pumped out of the system, and the main scavenge pump is responsible for this task. Therefore, if the propeller feathers, the output of the main scavenge pump decreases or drops off.

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  • 41. 

    On the 54H60-91 propeller, during feather operation, between approximately what psi are the pressure cutout switch contacts opened?

    • 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 54H60-91 propeller, the pressure cutout switch contacts are opened between approximately 600 to 800 psi.

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  • 42. 

    On the 54H60-91 propeller, which component is the primary electical ground for energizing the feather override holding coil?

    • A.

      Feather relay

    • B.

      Feather solenoid

    • C.

      Pressure cutout switch

    • D.

      PCBS

    Correct Answer
    C. Pressure cutout switch
    Explanation
    The pressure cutout switch is the primary electrical ground for energizing the feather override holding coil on the 54H60-91 propeller. This switch is responsible for cutting off the electrical power to the feather solenoid when the propeller reaches a certain pressure, preventing the propeller from feathering unintentionally. By grounding the feather override holding coil, the pressure cutout switch ensures that the propeller remains in the desired position and prevents any unwanted feathering.

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  • 43. 

    When attempting to unfeather the 54H60-91 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 54H60-91 propeller in flight, the throttle must be positioned above FLT IDLE. This means that the throttle should be set to a higher position than the flight idle setting.

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  • 44. 

    Which two cams, on the alpha shaft, control the 54H60-91 propeller unfeathering operation?

    • A.

      Manual feather and pressure cutout backup switch

    • B.

      Speed set and pressure cutout backup switch

    • C.

      Speed set and beta follow-up

    • D.

      Manual feather and beta set

    Correct Answer
    D. Manual feather and beta set
    Explanation
    The correct answer is manual feather and beta set. These two cams on the alpha shaft control the 54H60-91 propeller unfeathering operation. The manual feather cam is responsible for initiating the unfeathering process, while the beta set cam controls the pitch angle of the propeller blades during unfeathering.

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  • 45. 

    On the 54H60-91 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 54H60-91 propeller is 200.

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  • 46. 

    On the 54H60-91 propeller, after the NTS system actuator rod positins the mechanical linkage in the valve housing when a negative torque condition occurs, what component is shifted?

    • A.

      Speed set cam

    • B.

      Feather valve

    • C.

      Beta set cam

    • D.

      Pilot valve

    Correct Answer
    B. Feather valve
    Explanation
    When a negative torque condition occurs on the 54H60-91 propeller, the NTS system actuator rod positions the mechanical linkage in the valve housing. In this situation, the component that is shifted is the feather valve.

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  • 47. 

    Besides maintaing the optimum blade phase angle relationship between all propellers, what else does sychrophhasing do?

    • A.

      Keeps the propellers rotation 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 balde angle

    Correct Answer
    A. Keeps the propellers rotation at the same speed
    Explanation
    Synchronizing, or synchrophasing, is a system that ensures all propellers on a multi-engine aircraft rotate at the same speed. By maintaining the optimum blade phase angle relationship between all propellers, synchrophasing eliminates any speed differences and ensures that all propellers rotate at the same speed. This helps to reduce vibrations, improve efficiency, and enhance overall performance of the aircraft.

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  • 48. 

    The fuel governing check switches are used to reset the propeller governor t what percentage of rpm in the alpha range?

    • A.

      100%

    • B.

      102%

    • C.

      104%

    • D.

      106%

    Correct Answer
    D. 106%
    Explanation
    The fuel governing check switches are used to reset the propeller governor to 106% of RPM in the alpha range. This means that when the switches are activated, the propeller governor will adjust the fuel flow to increase the RPM of the propeller to 106% of its normal operating speed. This may be necessary in certain situations where additional power is required, such as during takeoff or climbing.

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  • 49. 

    Where is the pickup portion of the pulse generator located?

    • A.

      No. 1 blade

    • B.

      Pump housing

    • C.

      Valve housing

    • D.

      Deicer contact ring holder assembly

    Correct Answer
    B. Pump housing
    Explanation
    The pickup portion of the pulse generator is located in the pump housing.

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  • 50. 

    The pulse generator inputs to the synchrophaser unit are used only

    • A.

      To drive the feedback potentiometer

    • B.

      As a backup for throttle anticipation

    • C.

      When a master propeller is selected

    • D.

      To indicate actual rpm

    Correct Answer
    C. When a master propeller is selected
    Explanation
    When a master propeller is selected, the pulse generator inputs to the synchrophaser unit are used. This suggests that the pulse generator inputs are specifically designed to synchronize the propellers of multiple engines.

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