2A651 EOC Study Test Of Awesomeness
Random questions of 2a651 EOC here at your service for your learning experince and longitude of life and to save your ass when the time comes.
- 1.
(601) Which 54H60-91 propeller subassembly transmits engine torque to the propeller blades?
- A.
Barrel
- B.
Control
- C.
Low pitch stop
- D.
Pitchlock regulator
Correct Answer
A. BarrelExplanation
Volume 4 page 1-2Rate this question:
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- 2.
(601) On the 54H60-91 propeller, which component delivers the actual propeller blade angel 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
Volume 4 page 1-3
The beta feedback shaft deliver the actual propeller blade angle to the propeller control assembly. An extension, machined as part of the rear barrel half, contains female splines that mate with the male splines on the propeller shaft.Rate this question:
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- 3.
(601) On the 54H60-91 propeller, which is a function of the pitchlock regulator?
- A.
Stops the dome piston from increasing blade angle above 23.3 degrees
- B.
Prevents the blades from decreasing pitch if hydraulic pressure is lost
- C.
Prevents the cam bearing rollers from bottoming out in the track slopes
- D.
Prevents the propeller from going into the beta range when the throttle is positioned in the alpha range.
Correct Answer
B. Prevents the blades from decreasing pitch if hydraulic pressure is lostExplanation
It also prevents blades from decreasing pitch of an overspeed condition occurs. It also transfers the hydraulic fluid to the outboard and inboard sides of the dome piston.Rate this question:
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- 4.
(601) On the 54H60-91 propeller, which pitchlock component mechanially 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 splines spacer ring
Correct Answer
A. Pitchlock control camExplanation
Volume 4 page 1-3
The pitchlock control cam mechanicaly holds the two ratchet apart, preventing them from engaging when the propeller blade angle is below 25 degrees or above 55 degrees. this ensures pitchlock action does not interfere with normal reversing or unfeathering of the propeller.Rate this question:
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- 5.
(601) On the 54H60-91 propeller, which component is used in place of a shim plate on the No-1 blade?
- A.
Beveled thrust washer
- B.
Stationary ratchet
- C.
Beta segment gear
- D.
Blade barrel shim
Correct Answer
C. Beta segment gearExplanation
Volume 4 Page 1-5
The beta segment gear splines to and drives the beta feedback shaft, which is located in the barrel assembly. The beta feedback gear and shaft delivers actual propeller blade angle (No.1 blade) to the idler gear on the propeller control assemblyRate this question:
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- 6.
(601) On the 54H60-91 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
Volume 4 Page 1-5
Two sets of ball bearing allow the rotating cam to turn, while the stationary cam remains in a fixed position by splines on its flange outside diameter mating with splines on the barrel.Rate this question:
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- 7.
(601) On the 54H60-91 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 rangeExplanation
Volume 4 page 1-6Rate this question:
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- 8.
(601) On the 5H60-9 propeller, which component provides a means for balancing the propeller?
- A.
Deicer contact ring holder
- B.
Hub mounting bulkhead
- C.
Front spinner
- D.
Afterbody
Correct Answer
B. Hub mounting bulkheadExplanation
Volume 4 page 1-7
The bulkhead assembly is the mounting surface for the rear spinner and weights that are used for minor balancing of the propeller. The balancing plate is used as a counterweight to offset the bracket assembly for propeller balance.Rate this question:
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- 9.
(602) On the 54H60-91 propeller, hydraulic fluid is directed from the pump housing to the barrell assembly through what component?
- A.
Valve housing
- B.
Low pitch stop
- C.
Transfer bearing
- D.
Pitchlock regulator
Correct Answer
C. Transfer bearingExplanation
Volume 4 Page 1-11
Fluid pressure provided by the pumps, under the control of the valve housing assembly, is directed to the rotating barrel assembly through a transfer bearingRate this question:
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- 10.
(602) On the 54H60-91 propeller, what is the function of the differential gear train assembly?
- A.
Drives the main and standby pressure pumps
- B.
Controls operation of the pilot valve and serves as an electrical ground
- C.
Drives the rotating sleeve when the throttle is positioned in the beta range
- D.
Transmits blade angle movement to the valve housing and drives the propeller governor flyweights
Correct Answer
D. Transmits blade angle movement to the valve housing and drives the propeller governor flyweightsExplanation
Volume 4 Page 1-11Rate this question:
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- 11.
(602) On the 54H60-91 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
Volume 4 Page 1-11
The main scavenge pump returns fluid from the atmospheric sump to the pressurized sumpRate this question:
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- 12.
(602) On the 54H60-91 propeller, which pump assists the main pressure pump when large blade angle movements are required.
- A.
Main scavenge
- B.
Standby pressure
- C.
Auxiliary pressure
- D.
Auxiliary scavenge
Correct Answer
B. Standby pressureExplanation
Volume 4 Page 1-11
When overspeed or underspeed conditions occur and large blade angle movements are required, the standby pressure pump output is added to the main pump output to correct any offspeed conditionRate this question:
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- 13.
(602) On the 54H60-91 propeller, which cam disarms the NTS system linkage when the thrttle is positioned in the beta range?
- A.
Manual feather
- B.
Beta follow-up
- C.
Speed set
- D.
Beta set
Correct Answer
A. Manual featherExplanation
Volume 4 Page 1-12
The manual feather cam disarms the negative torque signal system linkage when the throttle is positioned in the beta range (maximum reverse to top of beta) and arms the NTS system when the throttle is positioned in the alpha (flight) range (flightidle to take off)Rate this question:
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- 14.
(602) On the 54H60-91 propeller, which valve, contatined in the valve housing, controls the flow of hydraulic fluid to and from the dome assembly?
- A.
Standby
- B.
Feather
- C.
Backup
- D.
Pilot
Correct Answer
D. PilotExplanation
Volume 4 Page 1-13
Pilot valve is part of the propeller governor assemblyRate this question:
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- 15.
(602) The 54H60-91 propeller governor speeder spring tension positions the pilot valve to maintain what percent rpm in the beta range?
- A.
99-103
- B.
104-108
- C.
109-113
- D.
114-118
Correct Answer
C. 109-113Explanation
Volume 4 Page 1-15
Speeder spring tension positions the pilot valve to maintain 100% rpm in the alpha range and from 109-113% rpm in the beta rangeSpeeder spring tension or the flyweights position the pilot valveRate this question:
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- 16.
(603) On the 54H60-91 propeller, when the throttle is moved to GROUND IDLE position, what degree setting does the coordinator pointer indicate on the protractor?
- A.
0
- B.
18
- C.
34
- D.
90
Correct Answer
B. 18Explanation
Volume 4 Page 1-17Rate this question:
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- 17.
(603) What switch, located in the control quadrant, activates the 54H-60-91 propeller governor speed bias servo assembly as the throttle is moved into the flight idle gate?
- A.
Beta indicator
- B.
Landing gear warning
- C.
Low speed ground idle
- D.
Synchrophaser disarming
Correct Answer
D. Synchrophaser disarmingExplanation
Volume 4 Page 1-18Rate this question:
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- 18.
The condition lever GND STOP position is only effective on the ground because the circuts made in this position are completed through what switches?
- A.
Landing gear touchdown
- B.
Low speed ground idle
- C.
Landing gear warning
- D.
Air start
Correct Answer
A. Landing gear touchdownExplanation
Volume 4 Page 1-19Rate this question:
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- 19.
(603) What component in the T56 engine coordinator provides reference signals to the electronic TD amplifier that are proportional to the desired TIT?
- A.
Feather shaft
- B.
Potentiometer
- C.
65 degree microswitch
- D.
66 degree microswitch
Correct Answer
B. PotentiometerExplanation
Volume 4 Page 1-21
The potentiometer shaft is engages by gears to the coordinator throttle shaft. As the shaft rotates as a result of throttle movement, the varying voltage across the potentiometer provides reference signals to the electronic temperature datum amplifier. The reference voltage is proportional to the desired turbine inlet temperature.Rate this question:
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- 20.
(604) On the 54H60-91 propeller, the output of what pump is sufficient to supply hydraulic pressure for normal propeller operation?
- A.
Auxiliary pressure
- B.
Standby pressure
- C.
Backup pressure
- D.
Main pressure
Correct Answer
D. Main pressureExplanation
Volume 4 page 1-26Rate this question:
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- 21.
(604) On the 54H60–91 propeller, if the main filter becomes clogged, which valve opens to assure continued flow?
- A.
Check
- B.
Bypass
- C.
Low pressure relief
- D.
High pressure relief
Correct Answer
B. BypassExplanation
Volume 4 page 1-26Rate this question:
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- 22.
(604) On the 54H60–91 propeller, which valve sets and maintains a pressure differential of about 100 psi between system pressure and the increase- or decrease-pitch pressure?
- A.
Check
- B.
Bypass
- C.
Low-pressure relief
- D.
High-pressure relief
Correct Answer
C. Low-pressure reliefExplanation
Volume 4 Page 1-26Rate this question:
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- 23.
(604) On the 54H60–91 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. ReverseExplanation
Volume 4 Page 1-26
When the backup valve is closed, decrease-pitch pressure (to the dome) is limited to 100 psi above
the pressurized sump pressure by the low-pressure relief valve. When the backup valve is opened,
decrease-pitch pressure is routed behind the low-pressure relief valve. This pressure, routed to the
governor pilot valve, is required to release the low pitch stop and to unfeather the propeller. It is also
used for reverse pitch operation.Rate this question:
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- 24.
(604) On the 54H60–91 propeller, which pump is used to feather or unfeather the propeller during static propeller operation?
- A.
Main
- B.
Backup
- C.
Standby
- D.
Auxiliary
Correct Answer
D. AuxiliaryExplanation
Volume 4 Page 1-26
When an overspeed of 103.5 percent exists (decreasing-pitch increases rpm), the flyweights of the
pitchlock valve overcome spring tension as a result of centrifugal force. This opens a port within the
flyweight cavity. Regulated pressure passes through the port to the spring end of the servo valve. This
pressure upsets the balance between the servo valve spring and the hydraulic pressure on the other
end of the servo valve. The servo valve moves and cuts off the pressure to the pitchlock release
piston. At the same time, the servo valve directs the pitchlock line to barrel pressure, causing the
ratchets to engage; thus, preventing blade angle from decreasing even further due to CTM.Rate this question:
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- 25.
(604) On the 54H60–91 propeller, which type of valve opens to allow the output of the standby pump to combine with the output of the main pump?
- A.
Check
- B.
Bypass
- C.
Lowe pressure relief
- D.
High pressure relief
Correct Answer
A. CheckExplanation
Volume 4 Page 1-26
The output of the standby pump is
applied to a standby pump check valve that opens at a pressure differential of 10 to 15 psi above the
main pump pressure. When the check valve opens, the standby pump output is combined with the
main pump output; thus, providing additional hydraulic power for a high rate of pitch change during
feathering, reversing, and significant off-speed conditionsRate this question:
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- 26.
(605) The purpose of the 54H60–91 propeller pitchlock assembly is to prevent
- A.
The loss of oil pressure
- B.
An engine overspeed due to a loss of power
- C.
The flow of hydraulic fluid to the pilot valve
- D.
An engine overspeed due to a loss of hydraulic pressure
Correct Answer
D. An engine overspeed due to a loss of hydraulic pressureExplanation
Volume 4 page 1-27
The pitchlock regulator assembly's purpose is to transfer fluid to the outboard and inboard sides of the dome piston and restrict overspeeding of the engine if there's a loss of propeller hydraulic pressure or and overspeed in excess of 103.5%Rate this question:
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- 27.
(605) On the 54H60–91 propeller, what prevents engagement of the stationary and rotating ratchets at blade angles below 25° and above 55°?
- A.
An overspeed of 103.5%
- B.
The pitchlock control cam
- C.
A loss of hydraulic pressure
- D.
Increase- or decrease pitch pressure
Correct Answer
B. The pitchlock control camExplanation
Volume 4 page 1-27Rate this question:
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- 28.
(605) On the 54H60–91 propeller, between the blade angles of 25° and 55°, what will keep the rotating and stationary ratchets disengaged?
- A.
An overspeed of 103.5%
- B.
THe pitchlock control cam
- C.
A loss of hydraulic pressure
- D.
Increase or decrease pitch pressure
Correct Answer
D. Increase or decrease pitch pressureExplanation
Volume 4 page 1-27Rate this question:
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- 29.
(605) On the 54H60–91 propeller, the function of the low pitch stop is to prevent the
- A.
Propeller barrel from decreasing blade angle below 23.3° ± .5°.
- B.
Dome piston from decreasing blade angle below 23.3° ± .5°.
- C.
Propeller barrel from decreasing blade angle below 34° ± .5°.
- D.
Dome piston from decreasing blade angle below 34° ± .5°.
Correct Answer
B. Dome piston from decreasing blade angle below 23.3° ± .5°.Explanation
Volume 4 Page 1-28
The low pitch stop assembly is considered a safety device and its name implies just what it does—it
stops blade movement at the lowest possible pitch required for an aircraft to sustain flight. Its function
is to prevent the propeller from going into the beta (ground) range while the throttle is positioned in
the flight range (i.e., loss of throttle control). This is done by mechanically stopping the dome piston
from moving, which ultimately prevents propeller blade angle from decreasing below FLT IDLE
(23.3 degrees ± .5 degrees)Rate this question:
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- 30.
(605) On the 54H60–91 propeller, what forces the stop levers on the low pitch stop to move outward?
- A.
Wedge
- B.
Servo valve
- C.
Dome piston
- D.
Hydraulic pressure
Correct Answer
A. WedgeExplanation
Volume 4 page 1-29Rate this question:
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- 31.
(605) On the 54H60–91 propeller, when pressure builds to between 240 and 280 psi, which valve is unseated and allows the stop levers to retract?
- A.
Low pressure relief
- B.
Governor pilot
- C.
Backup
- D.
Servo
Correct Answer
D. ServoExplanation
Volume 4 page 1-29
When pressure reaches approximately 240 to 280 psi, it unseats the servo valve and moves the wedge, Once the wedge is repositiones, the stop levers retrace and allow the piston to moveRate this question:
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- 32.
(606) What is coordinated by the throttle in the controllable pitch range?
- A.
Blade pitch and engine fuel flow
- B.
Balde pitch and temperature limiting
- C.
Enginge fuel flow and constant speed governing
- D.
Temperature limiting and constant speed governing
Correct Answer
A. Blade pitch and engine fuel flowExplanation
Volume 4 Page 1-31
A controllable pitch propeller is a propeller that increases or decreases blade angle in response to
mechanical control. This type of propeller is useful in the ground operation of the aircraft. Positive
thrust can be used for taxiing and negative thrust for backing. The controllable pitch propeller does
not maintain constant rpm, as does the constant speed propeller. With a controllable pitch propeller,
the fuel to the engine must be controlled. An increase in pitch without an increase in fuel would cause
the rpm to decrease. A decrease in pitch without a decrease in fuel would cause rpm to increase. To
prevent these changes in rpm, the fuel is scheduled to match blade angle changes. The throttle
coordinates propeller blade pitch and engine fuel flow in controllable pitch operations.Rate this question:
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- 33.
(607) On the 54H60–91 propeller, during beta range operation, what moves the pilot valve?
- A.
Throttle
- B.
Hydraulic pressure
- C.
Cams and mechanical linkage
- D.
Flyweights and speeder spring
Correct Answer
C. Cams and mechanical linkageExplanation
Volume 4 Page 1-32Rate this question:
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- 34.
(607) On the 54H60–91 propeller, during beta range operation, the rotation of which cam moves the mechanical linkage to center the governor pilot valve?
- A.
Beta set
- B.
Speed set
- C.
Backup valve
- D.
Beta follow-up
Correct Answer
D. Beta follow-upExplanation
Volume 4 Page 1-32
Centering the pilot valve stops hydraulic action and blade movement in the prop.Rate this question:
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- 35.
(607) On the 54H60–91 propeller, during alpha range operation, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent rpm?
- A.
Beta set
- B.
Speed set
- C.
Backup valve
- D.
Beta follow-up
Correct Answer
B. Speed setExplanation
Volume 4 Page 1-33
When the alpha shaft rotates, the speed set cam positions the mechanical linkage to change the tension of governor speeder spring. The speeder spring tension changes and positions the governor pilot valve to maintain 100% engine speed in the alpha range. The governor flyweights are driven through gears on the differential gear train by propeller rotation.Rate this question:
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- 36.
(607) On the 54H60–91 propeller, during an underspeed condition, what moves the pilot valve?
- A.
Decrease hydraulic pressure
- B.
Increased hydraulic pressure
- C.
Speeder spring
- D.
Flyweights
Correct Answer
C. Speeder springExplanation
Volume 4 Page 1-33
When engine speed is less then 100%, the reduction of centrifugal force on the governor flyweights upsets the balance between the speed spring and the flyweights. When this upset occurs, the pilot valve is positioned by the speeder spring so that pressure is routed to the aft end of the dome piston.Rate this question:
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- 37.
(608) On the 54H60–91 propeller, when feathering the propeller, what acts on the mechanical linkage to open the feather actuating valve?
- A.
Throttle
- B.
Beta shaft
- C.
Pilot valve
- D.
Manual feather cam
Correct Answer
D. Manual feather camExplanation
Volume 4 Page 1-34
The opened feather actuating valve routes hydraulic fluid to shift the feather valve and pilot valve, which will start the feathering process.Rate this question:
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- 38.
(608) On the 54H60–91 propeller, during feathering operation, the feather valve is positioned to meter hydraulic fluid to the
- A.
Aft end of the dome piston
- B.
Forward end of the dome piston
- C.
Decrease-pitch side of the pilot valve
- D.
Increase-pitch side of the pilot valve
Correct Answer
B. Forward end of the dome pistonExplanation
Volume 4 Page 1-34
Fluid routed to the forward end of the dome piston moves the piston rearward and, therefore, increases blade angel.Rate this question:
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- 39.
(608) On the 54H60–91 propeller, which valve is a backup in case the feather valve fails during feathering operation?
- A.
Pilot
- B.
Feather solenoid
- C.
Feather actuating
- D.
Standby pump check
Correct Answer
A. PilotExplanation
Volume 4 Page 1-34Rate this question:
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- 40.
(608) As the 54H60–91 propeller feathers, the output of which pump decreases (drops off)?
- A.
Auxiliary pressure
- B.
Aulixiary scavenge
- C.
Main scavenge
- D.
Feather
Correct Answer
C. Main scavengeExplanation
Volume 4 Page 1-34
Since the main scavenge is powered by engine rotation, output decreases as rpm slows down. the auxillary pumps are electronically driven so they dont slow down with speed.Rate this question:
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- 41.
(608) On the 54H60–91 propeller, during feather operation, between approximately what psi are the pressure cutout switch contacts opened?
- A.
0-200
- B.
300-500
- C.
600-800
- D.
900-1100
Correct Answer
C. 600-800Explanation
Volume 4 Page 1-34Rate this question:
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- 42.
(608) On the 54H60–91 propeller, which component is the primary electrical ground for energizing the feather override holding coil?
- A.
Feather relay
- B.
Feather solenoid
- C.
Pressure cutout switch
- D.
PCBS
Correct Answer
C. Pressure cutout switchExplanation
Volume 4 Page 1-35Rate this question:
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Mar 19, 2022Quiz Edited by
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Nov 06, 2011Quiz Created by
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