Aeronautics Knowledge Test: The 54h60-117, Dowty R391 Propeller Systems And Gtcp 165 Engine
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Questions and Answers
- 1.
Which 54h60-117 propeller propeller subassembly transmits engine torque to the propeller blades?
- A.
Barrel
- B.
Control
- C.
Low pitch stop
- D.
Pitchlock regulator
Correct Answer
A. BarrelExplanation
The barrel is the correct answer because it is a component of the propeller subassembly that is responsible for transmitting engine torque to the propeller blades. The barrel is designed to house and support the propeller blades, allowing them to rotate and generate thrust. It plays a crucial role in converting the rotational motion of the engine into forward propulsion.Rate this question:
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- 2.
Which 54h60-117 propeller subassembly carries high centrifugal loads created by the propeller blades?
- A.
Dome
- B.
Barrel
- C.
Control
- D.
Front spinner
Correct Answer
B. BarrelExplanation
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.Rate this question:
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- 3.
On the 54h60-117 propeller, which component delivers the actual propeller blade angle from the blade to the control assembly?
- A.
Microadjusting ring
- B.
Beta feedback shaft
- C.
Blade segment gear
- D.
Blade bushing
Correct Answer
B. Beta feedback 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.
On the 54h60-117 propeller, which pitchlock component mechanically holds the stationary and rotating pitchlock ratchets 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 camExplanation
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.Rate this question:
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- 5.
On the 54h60-117 propeller, what component is installed on the blade before the blade butt is formed during manufacture?
- A.
Slip rings
- B.
Microadjusting ring
- C.
Roller thrust bearing
- D.
Beveled thrust washer
Correct Answer
D. Beveled thrust washerExplanation
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.Rate this question:
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- 6.
On the 54h60-117 propeller, which dome assembly part allows the rotating cam to turn while the stationary cam remains in a fixed position?
- A.
Roller shaft
- B.
Track slopes
- C.
Ball bearings
- D.
Roller bearings
Correct Answer
C. Ball bearingsExplanation
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.Rate this question:
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- 7.
On the 54h60-117 propeller, which dome assembly component limits cam travel and prevents the propeller from exceeding feather and reverse blade angles?
- A.
Rotating pitchlock ratchet
- B.
Low pitch stop
- C.
Stationary cam
- D.
Stop ring
Correct Answer
D. Stop ringExplanation
The stop ring is the component that limits cam travel and prevents the propeller from exceeding feather and reverse blade angles on the 54H60-117 propeller. It acts as a physical barrier, stopping the movement of the cam beyond a certain point. This ensures that the propeller operates within the desired range and prevents any potential damage or malfunction.Rate this question:
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- 8.
On the 54h60-117 propeller propeller, what functions 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 angle 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 rangeExplanation
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.Rate this question:
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- 9.
On the 54h60-117 propeller, which component's purpose is to provide electrical circuits between the brush block assembly and the deicing elements of the blade assemblies?
- A.
Control assembly
- B.
Front spinner section
- C.
Hub mounting bulkead
- 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 acts as a connector or interface between these two components, allowing the electrical current to flow and power the deicing elements.Rate this question:
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- 10.
On the 54h60-117 propeller, during normal propeller operation, the output of which pumps is used?
- A.
Main pressure and main scavenge
- B.
Standby pressure and main savenge
- C.
Auxiliary pressure and main scavenge
- 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. 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.Rate this question:
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- 11.
On the 54h60-117 propeller, which pump(s) is/are used during propeller static operation?
- A.
Main pressure
- B.
Main scavenge
- C.
Standby pressure and main scavenge
- D.
Auxiliary pressure and auxiliary scavenge
Correct Answer
D. Auxiliary pressure and auxiliary scavengeExplanation
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.Rate this question:
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- 12.
On the 54h60-117 propeller, which cam disarms the NTS system linkage when the throttle is positioned in the beta range?
- A.
Manual feather
- B.
Beta follow-up
- C.
Speed set
- D.
Beta set
Correct Answer
A. Manual featherExplanation
The cam that disarms the NTS system linkage when the throttle is positioned in the beta range is the manual feather cam. This cam is responsible for controlling the feathering of the propeller blades, which is necessary in certain situations such as engine failure. By disarming the NTS system linkage, the manual feather cam ensures that the propeller blades remain in the desired position during beta range operation.Rate this question:
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- 13.
On the 54h60-117 propeller, which cam schedules a desired blade angle in the beta range?
- A.
Beta set
- B.
Beta follow-up
- C.
Beta shaft rigging
- D.
Alpha shaft rigging
Correct Answer
A. Beta setExplanation
The correct answer is "beta set". On the 54h60-117 propeller, the beta set cam is responsible for scheduling a desired blade angle in the beta range. This cam controls the pitch of the propeller blades to achieve the desired angle, allowing for efficient operation in the beta range. The other options, beta follow-up, beta shaft rigging, and alpha shaft rigging, are not directly related to scheduling the blade angle in the beta range.Rate this question:
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- 14.
On the 54h60-117 propeller, which valve connects the main, standby, and auxiliary pressure pumps' output to the increase pitch lines during negative torque conditions?
- A.
High pressure relief
- B.
Feather actuating
- C.
Feather
- D.
Pilot
Correct Answer
C. FeatherExplanation
The correct answer is "feather." In negative torque conditions, the feather valve connects the main, standby, and auxiliary pressure pumps' output to the increase pitch lines. This allows for the adjustment of the propeller blades to the feather position, reducing drag and preventing windmilling.Rate this question:
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- 15.
On the 54h60-117 propeller, which valve assists the feather solenoid valve with hydraulic positioning of the feather and pilot valves?
- A.
High pressure relief
- B.
Feather actuating
- C.
Standby
- D.
Backup
Correct Answer
B. Feather actuatingExplanation
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.Rate this question:
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- 16.
On the 54h60-117 propeller, what switch, located in the valve housing, is opened by a cam from 81 to 85 degress propeller blade angle?
- A.
Beta indicator
- B.
Pressure cutout
- C.
NTS
- D.
PCBS
Correct Answer
D. PCBSExplanation
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.Rate this question:
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- 17.
The 54h60-117 propeller governor speeder spring tension positions the pilot valve to maintain what percent rpm in the beta range?
- A.
104 to 108%
- B.
114 to 118%
- C.
99 to 103%
- D.
109 to 113%
Correct Answer
D. 109 to 113%Explanation
The 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%.Rate this question:
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- 18.
On the 54h60-117 propeller, if the main filter becomes clogged, which valve opens to assure continued flow?
- A.
Check
- B.
Bypass
- C.
Low pressure relief
- D.
High pressure relief
Correct Answer
B. BypassExplanation
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.Rate this question:
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- 19.
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?
- A.
Pitchlock
- B.
Standby
- C.
Reverse
- D.
Airstart
Correct Answer
C. ReverseExplanation
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.Rate this question:
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- 20.
On the 54h60-117 propeller, which pressure pump is used to feather or unfeather the propeller during static propeller operation?
- A.
Main
- B.
Backup
- C.
Standby
- D.
Auxiliary
Correct Answer
D. AuxiliaryExplanation
The auxiliary pressure pump is used to feather or unfeather the propeller during static propeller operation.Rate this question:
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- 21.
On the 54h60-117 propeller, which type of valve opens to allow the output of the standby pump to combine with the output of the main pump?
- A.
Check
- B.
Bypass
- C.
Low pressure relief
- D.
High pressure relief
Correct Answer
A. CheckExplanation
The correct answer is "check". In a propeller system, 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 flow of fluid is unidirectional, preventing any backflow or reverse flow from occurring. By allowing the outputs of both pumps to combine, the check valve ensures a continuous and combined output of fluid from the system.Rate this question:
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- 22.
On the 54h60-117 propeller, when standby pump output is not required, where is it routed?
- A.
Atmospheric sump
- B.
Pressurized sump
- C.
Dome assembly
- D.
Pilot valve
Correct Answer
B. Pressurized sumpExplanation
When the standby pump output is not required on the 54h60-117 propeller, it is routed to the pressurized sump.Rate this question:
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- 23.
What type of force used during pitchlock of the 54h60-117 propeller prevents the blades from decreasing pitch?
- A.
Spiral bending
- B.
Thrust bending
- C.
Centrifugal twisting moment
- D.
Aerodynamic twisting moment
Correct Answer
C. Centrifugal twisting momentExplanation
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.Rate this question:
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- 24.
The purpose of the 54h60-117 propeller pitchlock assembly is to prevent?
- A.
Loss of oil pressure
- B.
Flow of hydraulic fluid to the pilot valve
- C.
An engine overspeed due to a loss of power
- D.
Engine overspeed due to a loss of hydraulic pressure
Correct Answer
D. Engine overspeed due to a loss of hydraulic pressureExplanation
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.Rate this question:
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- 25.
What prevents engagement of the stationary and rotating ratchets on the 54h60-117 propeller when blade angle are below 25 and 55 degrees?
- 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 on the 54h60-117 propeller are below 25 and 55 degrees, the engagement of the stationary and rotating ratchets is prevented 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. It is important to maintain the appropriate pitch pressure in order to ensure proper functioning of the propeller.Rate this question:
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- 26.
What will keep the rotating and stationary ratchets disengaged on the 54h60-117 propeller when the blade angle are between 25 and 55 degress?
- 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 angle is between 25 and 55 degrees on the 54h60-117 propeller, the rotating and stationary ratchets will be disengaged by increasing or decreasing the pitch pressure. This means that adjusting the pitch pressure either higher or lower will cause the ratchets to disengage, allowing the blades to move freely. This action is necessary to prevent the propeller from being locked in a specific blade angle and allows for adjustment based on the desired pitch.Rate this question:
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- 27.
On the 54h60-117 propeller, what forces the stop levers on the low pitch stop to move outward?
- A.
Hydraulic pressure
- B.
Movable wedge
- C.
Dome piston
- D.
Servo valve
Correct Answer
B. Movable wedgeExplanation
The movable wedge is responsible for forcing the stop levers on the low pitch stop to move outward on the 54H60-117 propeller.Rate this question:
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- 28.
When pressure builds to between 240 and 280 psi on the 54h60-117 propeller, which valve is unseated and allows the stop levers to retract
- A.
Servo
- B.
Backup
- C.
Governor pilot
- D.
Low pressure relief
Correct Answer
A. ServoExplanation
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.
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 flowExplanation
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.Rate this question:
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- 30.
Constant speed can only occur when the throttle is positioned from?
- A.
Rvs to flt idle
- B.
Rvs to gnd idle
- C.
Gnd idle to flt idle
- D.
Flt idle to take off
Correct Answer
D. Flt idle to take offExplanation
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.Rate this question:
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- 31.
On the 54h60-117 propeller, what is the beta range indication display on the coordination?
- A.
34 to 90 degrees
- B.
18 to 90 degrees
- C.
0 to 34 degrees
- D.
0 to 18 degrees
Correct Answer
C. 0 to 34 degreesExplanation
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.Rate this question:
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- 32.
On the 54h60-117 propeller, during beta range operation, what moves the pilot valve?
- A.
Cams and mechanical linkage
- B.
Flyweights and speeder spring
- C.
Hydraulic pressure
- D.
Throttle
Correct Answer
A. Cams and mechanical linkageExplanation
During beta range operation, the movement of the pilot valve on the 54h60-117 propeller is controlled by cams and mechanical linkage. These components work together to transmit the input from the pilot to the valve, allowing for precise control of the propeller pitch and speed. The cams provide the necessary mechanical leverage, while the linkage ensures that the movement of the pilot valve is synchronized with the pilot's input. This system allows the pilot to adjust the propeller's pitch and speed accurately during beta range operation.Rate this question:
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- 33.
In the beta range of the 54h60-117 propeller, which cam increases the speeder spring tension?
- A.
Beta set
- B.
Speed set
- C.
Backup valve
- D.
Beta follow-up
Correct Answer
B. Speed setExplanation
The correct answer is "speed set". In the beta range of the 54h60-117 propeller, the speed set cam increases the tension of the spring. This allows for adjustments to be made to the propeller speed, resulting in increased speed. The other options listed (beta set, backup valve, and beta follow-up) do not directly affect the spring tension and therefore do not impact the propeller speed in the same way.Rate this question:
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- 34.
During beta range operation on the 54h60-117 propeller, which cam's rotation moves the mechanical linkage to center the governor pilot valve?
- A.
Beta set
- B.
Speed set
- C.
Backup valve
- D.
Beta-follow-up
Correct Answer
D. Beta-follow-upExplanation
The correct answer is "beta-follow-up". During beta range operation on the 54h60-117 propeller, the rotation of the beta-follow-up cam moves the mechanical linkage to center the governor pilot valve. This ensures that the propeller pitch is properly controlled and adjusted based on the desired beta range operation.Rate this question:
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- 35.
During alpha range operation on the 54h60-117 propeller, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent engine speed?
- A.
Beta set
- B.
Speed set
- C.
Backup valve
- D.
Beta follow-up
Correct Answer
B. Speed setExplanation
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.Rate this question:
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- 36.
During an overspeed condition in the alpha range on the 54h60-117 propeller, the flyweights move the governor pilot valve to meter hydraulic fluid, which will?
- A.
Increase blade angle
- B.
Decrease blade angle
- C.
Engage the low pitch stop
- D.
Engage the pitchlock ratchets
Correct Answer
A. Increase blade angleExplanation
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.Rate this question:
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- 37.
Once an overspeed 54h60-117 propeller condition is corrected and the pilot valve is returned to the center position, what is the result?
- A.
Hydraulic fluid flow to the dome assembly is increased
- B.
Blades are moved to the feather position
- C.
Propeller starts to underspeed
- D.
System is back on-speed
Correct Answer
D. System is back on-speedExplanation
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.Rate this question:
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- 38.
During an underspeed condition on the 54h60-117 propeller, what moves the pilot valve?
- A.
Decreased hydraulic pressure
- B.
Increased hydraulic pressure
- C.
Speeder spring
- D.
Flyweights
Correct Answer
C. Speeder springExplanation
The speeder spring moves the pilot valve during an underspeed condition on the 54h60-117 propeller. When the propeller is operating at a lower speed than desired, the speeder spring contracts, causing the pilot valve to move and increase the hydraulic pressure. This increased pressure helps to adjust the propeller pitch and bring it back to the desired speed.Rate this question:
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- 39.
When feathering the 54h60-117 propeller, what acts on the mechanical linkage to open the feather actuating valve?
- A.
Throttle
- B.
Beta shaft
- C.
Pilot valve
- D.
Manual feather cam
Correct Answer
D. Manual feather camExplanation
When feathering the 54h60-117 propeller, the mechanical linkage is acted upon by the manual feather cam to open the feather actuating valve.Rate this question:
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- 40.
During 54h60-117 propeller feathering operation, the feather valve is positioned to meter hydraulic fluid to the?
- A.
Aft end of the dome piston
- B.
Forward end of the dome piston
- C.
Decrease-pitch side of the pilot valve
- D.
Increase-pitch side of the pilot valve
Correct Answer
B. Forward end of the dome pistonExplanation
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.Rate this question:
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- 41.
Which valve is a backup in case the feather valve fails during feathering operation on the 54h60-117 propeller?
- A.
Pilot
- B.
Feather solenoid
- C.
Feather actuating
- D.
Standby pump check
Correct Answer
A. PilotExplanation
The pilot valve is the backup valve in case the feather valve fails during feathering operation on the 54h60-117 propeller.Rate this question:
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- 42.
During the 54h60-117 propeller feathering operation, which valve acts as a backup for the feather actuating valve?
- A.
Feather
- B.
Standby check
- C.
Feather solenoid
- D.
Standby pump check
Correct Answer
C. Feather solenoidExplanation
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 or malfunctions, the feather solenoid can step in and perform the necessary function of feathering the propeller. It serves as a fail-safe mechanism to ensure that the propeller can still be properly feathered even if there is an issue with the primary valve.Rate this question:
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- 43.
During the 54h60-117 propeller feathering operation, which valve blocks off the standby pump output and causes hydraulic pressure to increase?
- A.
Feather
- B.
Standby check
- C.
Feather solenoid
- D.
Feather actuating
Correct Answer
D. Feather actuatingExplanation
The feather actuating valve blocks off the standby pump output and causes hydraulic pressure to increase during the propeller feathering operation. This valve is responsible for controlling the movement of the propeller blades into the feathered position. By blocking off the standby pump output, it ensures that the hydraulic pressure is directed towards the feathering mechanism, allowing the propeller blades to be properly feathered.Rate this question:
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- 44.
During feather operation on the 54h60-117 propeller, what range in pounds per square inch (psi) of fluid pressure opens the pressure cutout switch contacts?
- A.
0 to 200
- B.
300 to 500
- C.
600 to 800
- D.
900 to 1,100
Correct Answer
C. 600 to 800Explanation
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.Rate this question:
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- 45.
Which component on the 54h60-117 propeller 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 switchExplanation
The pressure cutout switch is the primary electrical ground for energizing the feather override holding coil. This means that when the pressure cutout switch detects a certain pressure level, it will provide the necessary electrical connection to activate the feather override holding coil. This coil is responsible for holding the propeller blades in the feathered position, preventing them from rotating and creating drag. Therefore, the pressure cutout switch plays a crucial role in controlling the propeller's operation and ensuring proper aircraft performance.Rate this question:
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- 46.
When attempting to unfeather the 54h60-117 propeller in flight, where must the throttle be positioned?
- A.
Any throttle position
- B.
Above flt idle
- C.
At take off
- D.
At gnd idle
Correct Answer
B. Above flt idleExplanation
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.Rate this question:
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- 47.
Which two cams on the alpha shaft control the 54h60-117 propeller unfeathering operation?
- A.
Speed set and beta follow-up
- B.
Manual feather and beta set
- C.
Speed set and pressure cutout backup switch
- D.
Manual feather and pressure cutout backup switch
Correct Answer
B. Manual feather and beta setExplanation
The correct answer is "manual feather and beta set." The manual feather cam controls the unfeathering operation by moving the propeller blades into the feathered position, while the beta set cam controls the blade angle during the unfeathering process. These two cams work together to initiate and control the unfeathering operation of the 54h60-117 propeller.Rate this question:
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- 48.
On the 54h60-117 propeller, what is the minimum psi required to release the feather latches and allow the piston to move forward?
- A.
200
- B.
400
- C.
600
- D.
800
Correct Answer
A. 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.
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 valveExplanation
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 a shift in the feather actuating valve. Therefore, the correct component that is shifted in this scenario is the feather actuating valve.Rate this question:
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- 50.
Besides maintaining the optimum blade phase angle relationship between all propellers, synchrophasing also?
- A.
Keeps the propellers rotating at the same speed
- B.
Keeps the propellers rotating at different speeds
- C.
Prevents the pilot valve from shifting to increase blade angle
- D.
Prevents the pilot valve from shifting to decrease blade angle
Correct Answer
A. Keeps the propellers rotating at the same speedExplanation
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.Rate this question:
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Current Version
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Mar 18, 2023Quiz Edited by
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Sep 28, 2012Quiz Created by
Hamandcheese
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