Aeronautics Knowledge Test: The 54h60-117, Dowty R391 Propeller Systems And Gtcp 165 Engine

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  • 1/79 Questions

    Which 54h60-117 propeller propeller subassembly transmits engine torque to the propeller blades?

    • Barrel
    • Control
    • Low pitch stop
    • Pitchlock regulator
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About This Quiz

This quiz evaluates knowledge on the 54H60-117 and Dowty R391 propeller systems, and the GTCP 165 engine, focusing on parts like the barrel, beta feedback shaft, and pitchlock control cam. It's designed for professionals seeking to understand aircraft propulsion components.

Aeronautics Knowledge Test: The 54h60-117, Dowty R391 Propeller Systems And Gtcp 165 Engine - Quiz

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  • 2. 

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

    • Inflate aircraft tires

    • Remove snow and ice from aircraft surfaces

    • Supply pneumatic power to aircraft pneumatic starters

    • Provide pneumatic power for air-conditioning systems

    Correct Answer
    A. Inflate aircraft tires
    Explanation
    The pneumatic air bled from the small gas turbine engine cannot be used to inflate aircraft tires because the air bled from the engine is not at a high enough pressure to properly inflate the tires. Inflating aircraft tires requires a high-pressure air source, such as an air compressor, to ensure that the tires are properly inflated to the required pressure for safe operation. Therefore, the air bled from the small gas turbine engine is not suitable for this purpose.

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  • 3. 

    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 savenge

    • Auxiliary pressure and main scavenge

    • Auxiliary pressure and auxiliary scavenge

    Correct Answer
    A. Main pressure and main scavenge
    Explanation
    During normal propeller operation, the output of the main pressure and main scavenge pumps is used. These pumps are responsible for maintaining the necessary pressure and scavenging functions in the propeller system. The main pressure pump ensures that there is sufficient oil pressure for proper lubrication and operation of the propeller, while the main scavenge pump removes any excess oil and debris from the system. Therefore, the combination of main pressure and main scavenge pumps is crucial for the efficient and reliable functioning of the propeller.

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  • 4. 

    Which 54h60-117 propeller subassembly carries high centrifugal loads created by the propeller blades?

    • Dome

    • Barrel

    • Control

    • Front spinner

    Correct Answer
    A. Barrel
    Explanation
    The barrel of the 54h60-117 propeller subassembly carries high centrifugal loads created by the propeller blades. This means that the barrel is designed to withstand and distribute the forces exerted by the rotating blades, ensuring stability and efficiency of the propeller system. The dome, control, and front spinner may have other functions in the propeller assembly, but they do not specifically carry the high centrifugal loads created by the propeller blades.

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  • 5. 

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

    • Keeps the propellers rotating at the same speed

    • Keeps the propellers rotating at different speeds

    • Prevents the pilot valve from shifting to increase blade angle

    • Prevents the pilot valve from shifting to decrease blade angle

    Correct Answer
    A. Keeps the propellers rotating at the same speed
    Explanation
    Synchrophasing refers to the process of keeping the propellers of an aircraft rotating at the same speed. This is important because it helps maintain the optimum blade phase angle relationship between all propellers. By keeping the propellers at the same speed, the aircraft can achieve better efficiency and reduce vibrations. It also helps in reducing noise levels and improving overall performance.

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  • 6. 

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

    • Pods

    • An h-frame

    • A two-wheel trailer

    • A four-wheel trailer

    Correct Answer
    A. A four-wheel trailer
    Explanation
    The correct answer is a four-wheel trailer. When used for ground operation, the sgt engine can be installed on a four-wheel trailer. This means that the engine can be easily transported and moved around on a trailer with four wheels. This option provides stability and maneuverability for the engine during ground operations.

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  • 7. 

    On the 54h60-117 propeller, which pump(s) is/are used during propeller static operation?

    • Main pressure

    • Main scavenge

    • Standby pressure and main scavenge

    • Auxiliary pressure and auxiliary scavenge

    Correct Answer
    A. Auxiliary pressure and auxiliary scavenge
    Explanation
    During propeller static operation, the auxiliary pressure pump and auxiliary scavenge pump are used. These pumps are responsible for providing the necessary pressure and scavenging functions to ensure the propeller operates efficiently and effectively. The main pressure and main scavenge pumps are not used during this operation.

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  • 8. 

    When attempting to unfeather the  54h60-117 propeller in flight, where must the throttle be positioned?

    • Any throttle position

    • Above flt idle

    • At take off

    • At gnd idle

    Correct Answer
    A. Above flt idle
    Explanation
    When attempting to unfeather the 54h60-117 propeller in flight, the throttle must be positioned above flt idle. This means that the throttle should be set to any position higher than the flight idle position.

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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?

    • Control assembly

    • Front spinner section

    • Hub mounting bulkead

    • Deicer contact ring holder

    Correct Answer
    A. Deicer contact ring holder
    Explanation
    The deicer contact ring holder is responsible for providing electrical circuits between the brush block assembly and the deicing elements of the blade assemblies. It acts as a connector or interface between these two components, allowing the electrical current to flow and power the deicing elements.

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  • 10. 

    What type of force used during pitchlock of the 54h60-117 propeller prevents the blades from decreasing pitch?

    • Spiral bending

    • Thrust bending

    • Centrifugal twisting moment

    • Aerodynamic twisting moment

    Correct Answer
    A. Centrifugal twisting moment
    Explanation
    The centrifugal twisting moment is the force that prevents the blades of the 54h60-117 propeller from decreasing pitch during pitchlock. This force is generated due to the rotation of the propeller and acts in the opposite direction to the decrease in pitch, keeping the blades in position.

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  • 11. 

    The purpose of the 54h60-117 propeller pitchlock assembly is to prevent?

    • Loss of oil pressure

    • Flow of hydraulic fluid to the pilot valve

    • An engine overspeed due to a loss of power

    • Engine overspeed due to a loss of hydraulic pressure

    Correct Answer
    A. Engine overspeed due to a loss of hydraulic pressure
    Explanation
    The purpose of the 54H60-117 propeller pitchlock assembly is to prevent engine overspeed due to a loss of hydraulic pressure. This means that if there is a loss of hydraulic pressure, the pitchlock assembly will engage and prevent the propeller from spinning too fast, which could lead to an engine overspeed.

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  • 12. 

    The master synchrophaser board located in the synchrophaser unit contains a 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

    Correct Answer
    A. No.2 and no.3
    Explanation
    The correct answer is no.2 and no.3. This means that the master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel.

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  • 13. 

    The "c" in the engine number GTCP 165 indicates that the engine?

    • Provides electrical power

    • Provides compressed air

    • Is gas powered

    • Is a turbine

    Correct Answer
    A. Provides compressed air
    Explanation
    The "c" in the engine number GTCP 165 indicates that the engine provides compressed air.

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  • 14. 

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

    • Couplings on a common shaft

    • A gear reduction gearbox

    • Helical splines

    • Tie bolts

    Correct Answer
    A. Couplings on a common shaft
    Explanation
    The impeller wheel and two turbine wheels in the turbine section of the GTCP 165 engine are connected by couplings on a common shaft. This means that all three components are attached to the same shaft, allowing them to rotate together and transfer power from the impeller wheel to the turbine wheels. Couplings provide a secure and efficient connection, ensuring smooth operation of the engine.

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  • 15. 

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

    • Poppet

    • Scheduling

    • Fuel flow divider

    • Fuel shutoff solenoid

    Correct Answer
    A. Fuel shutoff solenoid
    Explanation
    The fuel shutoff solenoid is the valve that closes to ensure fuel flow is terminated when the gtcp 165 engine shuts down. This solenoid is responsible for stopping the fuel supply to the engine, preventing any further fuel from entering the system. By closing this valve, the fuel flow is effectively cut off, ensuring the engine is no longer receiving fuel and can safely shut down.

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  • 16. 

    On the 54h60-117 propeller, what component is installed on the blade before the blade butt is formed during manufacture?

    • Slip rings

    • Microadjusting ring

    • Roller thrust bearing

    • Beveled thrust washer

    Correct Answer
    A. Beveled thrust washer
    Explanation
    During the manufacture of the 54h60-117 propeller, the beveled thrust washer is installed on the blade before the blade butt is formed. This component helps to provide stability and support to the blade, ensuring smooth and efficient operation of the propeller. It is designed with beveled edges to distribute the thrust load evenly, reducing friction and wear on the propeller system.

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  • 17. 

    During alpha range operation on the  54h60-117 propeller, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent engine speed?

    • Beta set

    • Speed set

    • Backup valve

    • Beta follow-up

    Correct Answer
    A. Speed set
    Explanation
    The correct answer is "speed set." During alpha range operation on the 54h60-117 propeller, the speed set cam changes the tension of the speeder spring. This adjustment allows the governor pilot valve to maintain 100 percent engine speed.

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  • 18. 

    On the 54h60-117 propeller, what is the beta range indication display on the coordination?

    • 34 to 90 degrees

    • 18 to 90 degrees

    • 0 to 34 degrees

    • 0 to 18 degrees

    Correct Answer
    A. 0 to 34 degrees
    Explanation
    The beta range indication display on the coordination for the 54h60-117 propeller is 0 to 34 degrees. This means that the propeller can be adjusted to a minimum of 0 degrees and a maximum of 34 degrees of beta range. The beta range refers to the angle of the propeller blades in relation to the plane of rotation. By adjusting the beta range, the pilot can control the thrust and drag produced by the propeller, allowing for better maneuverability and performance of the aircraft.

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  • 19. 

    On a gtcp 165 engine oil system, air that leaks past various oil seals exits through the?

    • Vent system

    • Pressure system

    • Scavenge system

    • Auxiliary

    Correct Answer
    A. Vent system
    Explanation
    On a GTCP 165 engine oil system, air that leaks past various oil seals exits through the vent system. The vent system is designed to release any excess pressure or air that may accumulate in the oil system. This helps to prevent any potential damage or malfunction caused by excessive pressure build-up.

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  • 20. 

    On the 54h60-117 propeller, what forces the stop levers on the low pitch stop to move outward?

    • Hydraulic pressure

    • Movable wedge

    • Dome piston

    • Servo valve

    Correct Answer
    A. Movable wedge
    Explanation
    The movable wedge is responsible for forcing the stop levers on the low pitch stop to move outward on the 54H60-117 propeller.

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  • 21. 

    During an overspeed condition in the alpha range on the  54h60-117 propeller, the flyweights move the governor pilot valve to meter hydraulic fluid, which will?

    • Increase blade angle

    • Decrease blade angle

    • Engage the low pitch stop

    • Engage the pitchlock ratchets

    Correct Answer
    A. Increase blade angle
    Explanation
    During an overspeed condition in the alpha range on the 54h60-117 propeller, the flyweights move the governor pilot valve to meter hydraulic fluid. This action will cause an increase in blade angle.

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  • 22. 

    On the 54h60-117 propeller, which component delivers the actual propeller blade angle from the blade to the control assembly?

    • Microadjusting ring

    • Beta feedback shaft

    • Blade segment gear

    • Blade bushing

    Correct Answer
    A. Beta feedback shaft
    Explanation
    The beta feedback shaft delivers the actual propeller blade angle from the blade to the control assembly.

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  • 23. 

    Once an overspeed  54h60-117 propeller condition is corrected and the pilot valve is returned to the center position, what is the result?

    • Hydraulic fluid flow to the dome assembly is increased

    • Blades are moved to the feather position

    • Propeller starts to underspeed

    • System is back on-speed

    Correct Answer
    A. System is back on-speed
    Explanation
    When the overspeed condition of the 54h60-117 propeller is corrected and the pilot valve is returned to the center position, the result is that the system is back on-speed. This means that the propeller is operating at the desired speed and is functioning properly.

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  • 24. 

    During feather operation on the  54h60-117 propeller, what range in pounds per square inch (psi) of fluid pressure opens the pressure cutout  switch contacts?

    • 0 to 200

    • 300 to 500

    • 600 to 800

    • 900 to 1,100

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

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  • 25. 

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

    • 2%

    • 4%

    • 6%

    • 8%

    Correct Answer
    A. 2%
    Explanation
    The compensating network in the synchrophaser unit allows the speed bias motor to correct a change in rpm by 2%. This means that if there is a deviation in the speed of the system, the compensating network will adjust the speed bias motor to correct it by 2% of the current rpm value.

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  • 26. 

    On the 54h60-117 propeller, which valve assists the feather solenoid valve with hydraulic positioning of the feather and pilot valves?

    • High pressure relief

    • Feather actuating

    • Standby

    • Backup

    Correct Answer
    A. Feather actuating
    Explanation
    The feather actuating valve assists the feather solenoid valve with the hydraulic positioning of the feather and pilot valves. This means that it helps control the movement and positioning of these valves, ensuring that they function properly in the feathering process. The high pressure relief valve, standby valve, and backup valve do not have a direct role in assisting the feather solenoid valve with hydraulic positioning.

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  • 27. 

    On the 54h60-117 propeller, if the main filter  becomes clogged, which valve opens to assure continued flow?

    • Check

    • Bypass

    • Low pressure relief

    • High pressure relief

    Correct Answer
    A. Bypass
    Explanation
    If the main filter becomes clogged on the 54h60-117 propeller, the bypass valve opens to assure continued flow. The bypass valve allows the fluid to bypass the clogged filter, ensuring that there is still a flow of fluid to the system. This prevents any potential damage or loss of function that could occur if the flow was completely blocked.

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  • 28. 

     which r391 dowty propeller component routes engine oil to and form the cylinder and piston?

    • Beta tube

    • Gbe valve

    • PUAD

    • GMAD

    Correct Answer
    A. Beta tube
    Explanation
    The beta tube routes engine oil to and from the cylinder and piston.

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  • 29. 

    What r391 dowty propeller assembly part provides an aerodynamic faring over the aft section of the hub?

    • Backplate

    • Rear spinner

    • Front spinner

    • Afterbody assemblies

    Correct Answer
    A. Backplate
    Explanation
    The backplate is the correct answer because it provides an aerodynamic fairing over the aft section of the hub. The backplate is a component of the R391 Dowty propeller assembly and is designed to improve the overall aerodynamic efficiency of the propeller system by reducing drag and improving airflow. It is located at the back of the hub and helps to streamline the propeller assembly, ultimately enhancing its performance.

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  • 30. 

    On the 54h60-117 propeller, which pitchlock component mechanically holds the stationary and rotating pitchlock ratchets pitchlock ratchets apart during reversing and unfeathering operations?

    • Pitchlock control cam

    • Pitchlock ratchet piston

    • Externally threaded ring

    • Externally splined spacer ring

    Correct Answer
    A. Pitchlock control cam
    Explanation
    The pitchlock control cam is the component that mechanically holds the stationary and rotating pitchlock ratchets apart during reversing and unfeathering operations. This allows for the proper functioning of the propeller during these operations.

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  • 31. 

    For the 54h60-117 propeller to operate in the normal governing mode, the propeller governor control switch must be placed in the normal position and the throttle must be?

    • At or above FLT IDLE and the synchrophase master switch in the ENG 2 or ENG 3 position

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

    • Below FLT IDLE and the prop resynchrophase switch in RESYNC/INDEX

    • Below FLT IDLE and the fuel governing switch in check

    Correct Answer
    A. At or above FLT IDLE and the synchrophase master switch in the OFF position
    Explanation
    In order for the 54h60-117 propeller to operate in the normal governing mode, the throttle must be at or above FLT IDLE and the synchrophase master switch must be in the OFF position. The synchrophase master switch controls the synchronization of propellers on multi-engine aircraft, and in this case, it needs to be turned off for the propeller to operate normally. The other options, such as below FLT IDLE or with the synchrophase master switch in the ENG 2 or ENG 3 position, do not meet the requirements for normal operation.

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  • 32. 

    During a normal start on a gtcp 165 engine, the igniter plug continues firing until engine rotation in rpm reaches?

    • 75 %

    • 80 %

    • 95 %

    • 100 %

    Correct Answer
    A. 95 %
    Explanation
    During a normal start on a GTCP 165 engine, the igniter plug continues firing until the engine rotation in RPM reaches 95%. This is because the igniter plug is responsible for igniting the fuel-air mixture in the engine's combustion chamber. By continuing to fire until 95% of the engine's rotation speed is reached, it ensures that the fuel is properly ignited and the engine can start running smoothly. Once the engine reaches this RPM, the igniter plug is no longer needed as the combustion process is self-sustaining.

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  • 33. 

    During normal gtcp 165 engine shutdown, what circuit trips to stop the engine?

    • 100 % circuit

    • 110 % circuit

    • Load-control circuit

    • Speed-switch control circuit

    Correct Answer
    A. 110 % circuit
    Explanation
    During a normal GTCP 165 engine shutdown, the 110% circuit trips to stop the engine. This circuit is designed to monitor the engine's speed and if it exceeds 110% of the normal operating speed, it triggers a shutdown to prevent any potential damage or unsafe conditions. By tripping the 110% circuit, the engine is safely stopped and brought to a halt.

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  • 34. 

    On the 54h60-117 propeller propeller, what functions is a task of the low pitch stop assembly?

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

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

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

    • Transmits engine torque to the blades

    Correct Answer
    A. Prevents the propeller from going into the beta range when the throttle is positioned in the alpha range
    Explanation
    The low pitch stop assembly on the 54h60-117 propeller is responsible for preventing the propeller from going into the beta range when the throttle is positioned in the alpha range. This means that it ensures the propeller stays within a certain range of pitch angles when the throttle is in a specific position, preventing the propeller from entering a range that could potentially cause issues or malfunctions.

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  • 35. 

    On the 54h60-117 propeller, what switch, located in the valve housing, is opened by a cam from 81 to 85 degress propeller blade angle?

    • Beta indicator

    • Pressure cutout

    • NTS

    • PCBS

    Correct Answer
    A. PCBS
    Explanation
    The PCBS (Propeller Control Backup System) is a switch located in the valve housing that is opened by a cam when the propeller blade angle is between 81 to 85 degrees. The PCBS is responsible for controlling the propeller pitch and ensuring proper functioning of the propeller system.

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  • 36. 

    Constant speed can only occur when the throttle is positioned from?

    • Rvs to flt idle

    • Rvs to gnd idle

    • Gnd idle to flt idle

    • Flt idle to take off

    Correct Answer
    A. Flt idle to take off
    Explanation
    When the throttle is positioned from flt idle to take off, it allows the engine to increase its power output gradually, which results in the aircraft accelerating smoothly and reaching a constant speed. This is because flt idle is the minimum throttle position required to keep the engine running, and as the throttle is advanced towards take off, more fuel is supplied to the engine, increasing its power and propelling the aircraft forward. Therefore, constant speed can only be achieved when the throttle is positioned from flt idle to take off.

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  • 37. 

    When feathering the  54h60-117 propeller, what acts on the mechanical linkage to open the feather actuating valve?

    • Throttle

    • Beta shaft

    • Pilot valve

    • Manual feather cam

    Correct Answer
    A. Manual feather cam
    Explanation
    When feathering the 54h60-117 propeller, the mechanical linkage is acted upon by the manual feather cam to open the feather actuating valve.

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  • 38. 

    On the  54h60-117 propeller, what is the minimum psi required to release the feather latches and allow the piston to move forward?

    • 200

    • 400

    • 600

    • 800

    Correct Answer
    A. 200
    Explanation
    The minimum psi required to release the feather latches and allow the piston to move forward on the 54h60-117 propeller is 200.

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  • 39. 

    In the event the r391 dowty propeller lost hydraulic pressure, the counterweights installed at the root of each propeller blade would drive the propeller blades toward what position?

    • Max reverse

    • Ground idle

    • Take off

    • Feather

    Correct Answer
    A. Feather
    Explanation
    If the R391 Dowty propeller loses hydraulic pressure, the counterweights installed at the root of each propeller blade would drive the propeller blades towards the feather position. Feathering the propeller means adjusting the blade angle to minimize drag and allow the aircraft to glide more efficiently in the event of an engine failure. This helps to maintain control and maximize the chances of a safe landing.

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  • 40. 

    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

    Correct Answer
    A. Oil pressure switch
    Explanation
    The oil pressure switch is responsible for shutting down the engine if the oil pressure drops below the safe minimum operating limit. This switch is designed to monitor the oil pressure and send a signal to the engine control system when the pressure falls below the threshold. This is a crucial safety feature as low oil pressure can lead to engine damage or failure. By shutting down the engine, the oil pressure switch helps prevent further damage and ensures the safe operation of the engine.

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  • 41. 

    The 54h60-117 propeller governor speeder spring tension positions the pilot valve to maintain what percent  rpm in the beta range?

    • 104 to 108%

    • 114 to 118%

    • 99 to 103%

    • 109 to 113%

    Correct Answer
    A. 109 to 113%
    Explanation
    The 54H60-117 propeller governor speeder spring tension positions the pilot valve to maintain a specific percentage of RPM in the beta range. The correct answer is 109 to 113%.

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  • 42. 

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

    • propeller blade pitch and engine fuel flow

    • Propeller blade pitch and temperature limiting

    • Engine fuel flow and constant speed governing

    • Temperature limiting and constant speed governing

    Correct Answer
    A. propeller blade pitch and engine fuel flow
    Explanation
    The throttle is responsible for coordinating the propeller blade pitch and engine fuel flow in the controllable pitch range. By adjusting the throttle, the pilot can control both the pitch of the propeller blades and the amount of fuel being supplied to the engine. This coordination allows for precise control over the aircraft's speed and power output.

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  • 43. 

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

    • +1.5

    • +1

    • 0

    • -1

    Correct Answer
    A. 0
    Explanation
    If the slave propeller blades are in the correct phase angle position during the synchrophasing governing mode, the resultant phase error voltage is 0. This means that there is no phase error between the slave propeller blades and the governing mode, indicating that they are in perfect synchronization.

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  • 44. 

    On a gtcp 165 engine, air for the load control system is extracted from the?

    • Torus

    • Combustor

    • Turbine plenum

    • Compressor deswirl vanes

    Correct Answer
    A. Turbine plenum
    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 compressor. It collects and distributes air to various systems within the engine, including the load control system. This system helps regulate the load on the engine by controlling the amount of fuel being burned. Extracting air from the turbine plenum ensures that the load control system receives the necessary air supply to function properly.

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  • 45. 

    On the 54h60-117 propeller, which dome assembly part allows the rotating cam to turn while the stationary cam remains in a fixed position?

    • Roller shaft

    • Track slopes

    • Ball bearings

    • Roller bearings

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

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  • 46. 

    On the 54h60-117 propeller, when the backup valve is opened, the hydraulic pressure routed to th governor pilot valve  is used for which operation?

    • Pitchlock

    • Standby

    • Reverse

    • Airstart

    Correct Answer
    A. Reverse
    Explanation
    When the backup valve is opened on the 54h60-117 propeller, the hydraulic pressure routed to the governor pilot valve is used for the operation of reversing.

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  • 47. 

    On the 54h60-117 propeller, which pressure pump is used to feather or unfeather the propeller during static propeller operation?

    • Main

    • Backup

    • Standby

    • Auxiliary

    Correct Answer
    A. Auxiliary
    Explanation
    The auxiliary pressure pump is used to feather or unfeather the propeller during static propeller operation.

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  • 48. 

    During  54h60-117 propeller feathering operation, the feather valve is positioned to meter hydraulic fluid to the?

    • Aft end of the dome piston

    • Forward end of the dome piston

    • Decrease-pitch side of the pilot valve

    • Increase-pitch side of the pilot valve

    Correct Answer
    A. Forward end of the dome piston
    Explanation
    During the propeller feathering operation, the feather valve is positioned to meter hydraulic fluid to the forward end of the dome piston. This is because the forward end of the dome piston is responsible for controlling the pitch of the propeller blades. By metering hydraulic fluid to this end, the propeller pitch can be adjusted to the desired angle for feathering.

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  • 49. 

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

    • Synchrophasing and beta range

    • Normal and synchrophasing

    • Beta and normal range

    • Alpha and beta range

    Correct Answer
    A. Normal and synchrophasing
    Explanation
    Normal and synchrophasing modes add more functionality to basic mechanical governing mode. Normal mode allows the propeller to operate at a constant speed, while synchrophasing mode allows for synchronization of multiple propellers on a multi-engine aircraft. This allows for smoother operation and reduces vibrations.

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