2A651 Edition2 Volume 4
Questions and Answers
- 1.
(601) 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 barrel of the 54H60-117 propeller subassembly is responsible for transmitting the engine torque to the propeller blades.Rate this question:
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- 2.
(601) 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 of the 54H60-117 propeller subassembly carries high centrifugal loads created by the propeller blades. The barrel is a structural component that supports the blades and transfers the centrifugal forces to the rest of the propeller assembly. It is designed to withstand the high rotational speeds and forces generated during operation.Rate this question:
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- 3.
(601) 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 shaftExplanation
The beta feedback shaft delivers the actual propeller blade angle from the blade to the control assembly.Rate this question:
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- 4.
(601) 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 propeller blades are locked in the desired position during these operations.Rate this question:
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- 5.
(601) 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
During the manufacturing process of the 54H60-117 propeller, a beveled thrust washer is installed on the blade before the blade butt is formed. This component helps to distribute the thrust load evenly and reduce friction between the blade and the propeller hub. It ensures smooth operation and efficient performance of the propeller system. Slip rings, microadjusting rings, and roller thrust bearings are not relevant to this specific step in the manufacturing process.Rate this question:
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- 6.
(601) 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 on the 54H60-117 propeller is allowed to turn while the stationary cam remains fixed due to the presence of ball bearings. Ball bearings are designed to reduce friction and allow smooth rotation between two moving parts. In this case, the ball bearings enable the rotating cam to move freely while the stationary cam remains in its fixed position.Rate this question:
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- 7.
(601) 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 to restrict the movement of the cam, ensuring that the propeller blades do not go beyond their designated positions. The other options, such as the rotating pitchlock ratchet, low pitch stop, and stationary cam, are not specifically designed to perform this function.Rate this question:
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- 8.
(601) 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 prevents the propeller from going into the beta range when the throttle is positioned in the alpha range. This is important because the beta range is used for reverse thrust, and it is undesirable for the propeller to enter this range while the throttle is in the alpha range. The low pitch stop assembly ensures that the propeller remains in the appropriate range of blade angles based on the position of the throttle.Rate this question:
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- 9.
(601) 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 holderExplanation
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 serves as a connection point for the electrical system, allowing the power to flow from the brush block assembly to the deicing elements, ensuring their proper functioning.Rate this question:
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- 10.
(602) 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 scavengeExplanation
During normal propeller operation, the output of the main pressure and main scavenge pumps is used on the 54H60-117 propeller.Rate this question:
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- 11.
(602) 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 on the 54H60-117 propeller, the auxiliary pressure pump and the auxiliary scavenge pump are used.Rate this question:
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- 12.
(602) 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 featherExplanation
The correct answer is Manual feather. When the throttle is positioned in the beta range on the 54H60-117 propeller, the NTS system linkage is disarmed by the cam of the Manual feather.Rate this question:
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- 13.
(602) 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." On the 54H60-117 propeller, the cam that schedules a desired blade angle in the beta range is the Beta set cam. This cam controls the pitch of the propeller blades in the beta range, allowing for efficient reverse thrust and deceleration of the aircraft.Rate this question:
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- 14.
(602) 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 propeller blades to be feathered, which means to be rotated parallel to the airflow, reducing drag and preventing windmilling.Rate this question:
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- 15.
(602) 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 the hydraulic positioning of the feather and pilot valves. It helps in controlling the movement and position of the valves, ensuring proper feathering of the propeller. The high pressure relief, standby, and backup valves are not directly involved in this specific function.Rate this question:
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- 16.
(602) On the 54H60–117 propeller, what switch, located in the valve housing, is opened by a cam from 81ï‚° to 85ï‚° propeller blade angle?
- A.
Beta indicator.
- B.
Pressure cutout.
- C.
NTS.
- D.
PCBS.
Correct Answer
D. PCBS.Explanation
The PCBS (Propeller Control Boost System) switch, located in the valve housing, is opened by a cam when the propeller blade angle is between 81° to 85°. This switch is part of the propeller control system and is responsible for controlling the boost pressure applied to the propeller blades.Rate this question:
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- 17.
(602) 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 54H60-117 propeller governor speeder spring tension positions the pilot valve to maintain a range of 109 to 113% RPM in the beta range.Rate this question:
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- 18.
(603) 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
When the main filter becomes clogged on the 54H60-117 propeller, the bypass valve opens to ensure that there is continued flow. The bypass valve allows the fluid to bypass the clogged filter and continue flowing through the system, preventing any disruptions or damage that could occur due to a lack of fluid flow.Rate this question:
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- 19.
(603) 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.Rate this question:
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- 20.
(603) 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.Rate this question:
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- 21.
(603) 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." On the 54H60-117 propeller, the check valve opens to allow the output of the standby pump to combine with the output of the main pump. This valve ensures that the hydraulic fluid flows in one direction and prevents any backflow.Rate this question:
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- 22.
(603) 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. This means that the excess fluid from the standby pump is directed to a pressurized sump rather than being used elsewhere in the system.Rate this question:
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- 23.
(604) 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 is used during pitchlock of the 54H60-117 propeller to prevent the blades from decreasing pitch. This twisting moment is generated by the centrifugal force acting on the rotating propeller blades, which counteracts any tendency for the blades to decrease their pitch angle. This ensures that the blades maintain their desired pitch setting during operation.Rate this question:
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- 24.
(604) 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 propeller pitchlock assembly will engage and prevent the propeller from spinning too fast, which could cause an overspeed condition. It is not related to loss of oil pressure or the flow of hydraulic fluid to the pilot valve.Rate this question:
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- 25.
(604) 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°.Rate this question:
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- 26.
(604) 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 pressureExplanation
When the blade angles are between 25° and 55°, the rotating and stationary ratchets on the 54H60–117 propeller will be disengaged by either increasing or decreasing the pitch pressure. This means that adjusting the pitch pressure either higher or lower will prevent the ratchets from engaging and allow for smooth rotation of the propeller blades.Rate this question:
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- 27.
(604) 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 movable wedge is responsible for moving the stop levers on the low pitch stop outward on the 54H60-117 propeller. The movable wedge is a component that is designed to transmit hydraulic pressure to the stop levers, causing them to move in the desired direction. This allows for control and adjustment of the pitch of the propeller blades.Rate this question:
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- 28.
(604) 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 builds to between 240 and 280 psi on the 54H60-117 propeller, the servo valve is unseated. This unseating of the servo valve allows the stop levers to retract.Rate this question:
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- 29.
(605) 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. The propeller blade pitch determines the angle at which the blades cut through the air, affecting the amount of thrust generated. The engine fuel flow controls the amount of fuel being supplied to the engine, which in turn affects the engine power output. By coordinating these two variables, the throttle ensures optimal performance and efficiency of the propeller system.Rate this question:
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- 30.
(605) 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 means that the throttle needs to be adjusted to a specific setting in order to maintain a consistent speed. The other options, RVS to FLT IDLE, RVS to GND IDLE, and GND IDLE to FLT IDLE, do not indicate a specific throttle position that would result in constant speed.Rate this question:
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- 31.
(606) On the 54H60–117 propeller, what is the beta range indication display on the coordinator?
- A.
34ï‚° to 90ï‚°.
- B.
18ï‚° to 90ï‚°.
- C.
0ï‚° to 34ï‚°.
- D.
0ï‚° to 18ï‚°.
Correct Answer
C. 0ï‚° to 34ï‚°.Explanation
The beta range indication display on the coordinator for the 54H60-117 propeller is from 0 degrees to 34 degrees.Rate this question:
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- 32.
(606) 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 movement of the pilot valve on the 54H60-117 propeller is controlled by cams and mechanical linkage. The cams and mechanical linkage mechanism is responsible for regulating the hydraulic pressure, which in turn controls the pitch of the propeller blades. This allows the pilot to adjust the propeller pitch and control the aircraft's speed and performance during beta range operation.Rate this question:
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- 33.
(606) 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, increasing the tension of the speeder spring can be achieved by adjusting the speed set. The speed set is responsible for controlling the speed of the propeller, and by increasing the tension of the speeder spring, the speed set can effectively increase the speed of the propeller in the beta range.Rate this question:
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- 34.
(606) 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.Rate this question:
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- 35.
(606) 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 speeder spring tension. This adjustment allows the governor pilot valve to maintain 100 percent engine speed.Rate this question:
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- 36.
(606) 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 will increase the blade angle.Rate this question:
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- 37.
(606) 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
Returning the pilot valve to the center position after correcting an overspeed condition on the 54H60-117 propeller will result in the system being back on-speed. This means that the propeller will return to its normal operating speed and the overspeed condition will be resolved.Rate this question:
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- 38.
(606) 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 hydraulic pressure in the propeller, and when there is an underspeed condition, the speeder spring adjusts the hydraulic pressure to increase the propeller speed and bring it back to the desired level.Rate this question:
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- 39.
(607) 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
The correct answer is Manual feather cam. When feathering the 54H60-117 propeller, the mechanical linkage is acted upon by the manual feather cam. This cam is responsible for opening the feather actuating valve, which allows the propeller blades to move into the feathered position. The throttle, beta shaft, and pilot valve are not directly involved in the feathering process.Rate this question:
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- 40.
(607) 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.Rate this question:
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- 41.
(607) 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
A. Pilot.Explanation
The correct answer is Pilot. During feathering operation on the 54H60-117 propeller, the pilot valve serves as a backup in case the feather valve fails. The pilot valve is responsible for controlling the flow of oil to the propeller blades, allowing them to be feathered or unfeathered. If the feather valve fails, the pilot valve ensures that the propeller can still be properly operated and controlled.Rate this question:
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- 42.
(607) 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 propeller feathering operation. This means that if the feather actuating valve fails, the feather solenoid will activate and ensure that the propeller blades are properly feathered. The other options, such as the pilot, feather, and standby pump check, do not serve as backups for the feather actuating valve in this operation.Rate this question:
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- 43.
(607) 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.Rate this question:
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- 44.
(607) 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. -
- 45.
(607) 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 on the 54H60-117 propeller. This switch is responsible for monitoring the oil pressure in the propeller system and activating the feather override holding coil when necessary. The feather relay, feather solenoid, and pressure cutout backup switch are not directly involved in the energizing of the feather override holding coil.Rate this question:
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- 46.
(607) 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 must be positioned above FLT IDLE. This means that the throttle can be at any position higher than the flight idle position.Rate this question:
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- 47.
(607) 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. These two cams on the alpha shaft control the 54H60-117 propeller unfeathering operation. The manual feather cam allows the propeller to be manually feathered, while the beta set cam is responsible for setting the propeller blade angle to the beta range.Rate this question:
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- 48.
(607) 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. 200Explanation
The minimum psi required to release the feather latches and allow the piston to move forward on the 54H60-117 propeller is 200.Rate this question:
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- 49.
(607) 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, which ultimately controls the feathering of the propeller blades. Therefore, the correct component that is shifted in this situation is the feather actuating valve.Rate this question:
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- 50.
(608) 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 in multi-engine aircraft to ensure that all propellers rotate at the same speed. By maintaining the optimum blade phase angle relationship, the synchronization system adjusts the propeller speed to match each other. This helps to reduce vibrations and noise caused by propellers rotating at different speeds, resulting in smoother operation and improved performance of the aircraft.Rate this question:
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