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Propellers And Small Gas Turbines > 54H60-117 Propeller > Flashcards

54H60-117 Propeller Flashcards

0
Q

Which subassembly carries high centrifugal loads created by the prop blades?

A

Barrel

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1
Q

Which subassembly transmits engine torque to the prop blades?

A

Barrel

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2
Q

Which component delivers actual blade angle from the blade to the control assembly?

A

Beta feedback shaft

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3
Q

Which pitchlock component mechanically holds the stationary and rotating pitchlock ratchets apart during reversing and unfeathering operations?

A

Pitchlock control cam

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4
Q

What component is installed on the blade before the blade butt is formed during manufacture?

A

Beveled thrust washer

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5
Q

Which dome assembly part allows the rotating cam to turn while the stationary cam remains in a fixed position?

A

Ball bearings

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6
Q

Which dome assembly component limits cam travel and prevents the propeller from exceeding feather and reverse blade angles?

A

Stop ring

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7
Q

What function is a task of the low pitch stop assembly?

A

Prevent the prop from going into the beta range when the throttle is in the alpha range

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8
Q

Which components purpose is to provide electrical circuits between the brush block assembly and the deicing elements of the blade assemblies?

A

Deicer contact ring holder

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9
Q

During normal propeller operation, the output of of which pumps is used?

A

Main pressure and main scavenge

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10
Q

Which pumps are use during propeller static operation?

A

Auxiliary pressure and auxiliary scavenge

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11
Q

Which cam schedules a desired blade angle in the beta range?

A

Beta set

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12
Q

Which valve connects the main, standby, and auxiliary pressure pumps’ output to the increase pitch lines during negative torque conditions?

A

Feather valve

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13
Q

Which valve assists the feather solenoid valve with hydraulic positioning of the propeller an the pilot valves?

A

Feather actuating

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14
Q

What switch, In the valve housing, is opened by a cam 81 to 85 degrees prop blade angle?

A

PCBS

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15
Q

The governor speeder spring tension positions the pilot valve to maintain what percent RPM in the beta range?

A

109% to 113%

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16
Q

If the main filter becomes clogged, what valve opens to assure continued flow?

A

Bypass

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17
Q

When the backup valve is opened, the hydraulic pressure routed to the pilot valve is used for which operation?

A

Reverse

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18
Q

Which pressure pump is used to feather or unfeather the prop during during static operation?

A

Auxiliary

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19
Q

Which type of valve opens to allow the output of the standby pump to combine with the output if the main pump?

A

Check

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20
Q

When the standby pump is not required, where is it routed?

A

Pressurized sump

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21
Q

What type of force used during the pitchlock prevents the blades from decreasing pitch?

A

Centrifugal twisting moment

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22
Q

The purpose of the pitchlock assembly is to prevent?

A

Engine overspeed due to loss of hydraulic pressure

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23
Q

What prevents engagement of the stationary and rotating ratchets when blade angles are below 25 degrees and above 55 degrees?

A

The pitchlock control cam

24
What will keep the rotating and stationary ratchets disengaged when the blade angles are between 25 degrees and 55 degrees?
Increase- or decrease pitch pressure
25
What forces the stop levers on the low pitch stop to move outward?
Moveable wedge
26
When pressure builds to between 240 and 280 psi, which valve is unseated and and allow stop lever to retract?
Servo
27
What is coordinated by the throttle in a controllable pitch range?
Propeller blade pitch and engine fuel flow
28
Constant speed can only occur when the throttle is positioned from?
FLT IDLE to TAKE OFF
29
What is the beta range indication display on the coordinator?
0 to 34 degrees
30
During beta range, what moves the pilot valve?
Cams and mechanical linkage
31
In the beta range, which cam increases speeder spring tension?
Speed set
32
During beta range operation, which cams' rotation moves the mechanical linkage to the center of the governor pilot valve?
Beta follow-up
33
During alpha range operation, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent engine speed?
Speed set
34
During an overspeed condition in the alpha range, the flyweights move the governor pilot valve to meter hydraulic fluid, which will?
Increase blade angle
35
Once an overspeed condition is corrected and the pilot valve is returned to the center position, what is the result?
System is back on-speed
36
During an underspeed condition, what moves the pilot valve?
Speeder spring
37
When feathering the prop, what acts on the mechanical linkage to actuate the feather actuating valve?
Manuel feather cam
38
During feathering operation, the feather valve is positioned to meter hydraulic fluid to the?
Forward end of the dome piston
39
Which valve is a backup in case the feather valve fails during feathering operation?
Feather solenoid
40
During feathering operation, which valve blocks off the standby pump output and causes hydraulic pressure to increase?
Feather actuating
41
During feather operation, what range on psi of fluid pressure opens the pressure cutout switch contacts?
600 to 800
42
Which component is the primary electrical ground for energizing the feather override holding coil?
Pressure cutout switch
43
When attempting to unfeather the prop on flight, where must the throttle be positoned?
Above FLT IDLE
44
Which two cams on the alpha shaft control the prop unfeathering operation?
Manual feather and beta set
45
What is the minimum psi required to release the feather latches and allow the piston to move forward?
200
46
After the NTS system actuator rod positions the mechanical linkage in the valve housing when a negative torque condition occurs, what component is shifted?
Feather actuating valve
47
Besides maintaining the optimum blade phase angle relationship between all propellers, synchrophasing also?
Keeps the propellers rotating at the same speed
48
What switches has spring-loaded guards to hold them in the NORMAL position?
Propeller governor control switches
49
What percent rpm in the alpha range are fuel governing check switches used to reset the propeller governor?
106%
50
On the speed bias motor, what results when the control winding voltage is different from the reference-winding voltage?
Speed bias motor rotates, and increases or decreases blade angle
51
The master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel used by what propellers?
No. 2 and No. 3
52
How much change in rpm does the compensating network in the synchrophaser unit allow the speed bias motor to correct?
2%
53
In mechanical governing mode, what causes the pilot valve to move and set the propeller speed?
Speeder spring or flyweights
54
Which propeller governing modes add more functionality to basic mechanical governing mode?
Normal and synchrophasing
55
For the prop to operate in normal governing mode, the propeller governor control switch must be in the NORMAL position and the throttle must be?
At or above FLT IDLE and the synchrophaser master switch in the OFF position
56
When an increase in rpm occurs during engine speed stabilization, how is an overspeed condition prevented?
Decrease speeder spring tension and position the pilot valve to increase blade angle
57
How many slave channels are contained on the master synchrophaser board in the synchrophaser unit?
One
58
If the slave prop blades are in the correct phase angle position during the synchrophasing governing mode, what is the resultant phase error voltage?
Zero

Propellers And Small Gas Turbines (3 decks)

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