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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
Q

What will keep the rotating and stationary ratchets disengaged when the blade angles are between 25 degrees and 55 degrees?

A

Increase- or decrease pitch pressure

25
Q

What forces the stop levers on the low pitch stop to move outward?

A

Moveable wedge

26
Q

When pressure builds to between 240 and 280 psi, which valve is unseated and and allow stop lever to retract?

A

Servo

27
Q

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

A

Propeller blade pitch and engine fuel flow

28
Q

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

A

FLT IDLE to TAKE OFF

29
Q

What is the beta range indication display on the coordinator?

A

0 to 34 degrees

30
Q

During beta range, what moves the pilot valve?

A

Cams and mechanical linkage

31
Q

In the beta range, which cam increases speeder spring tension?

A

Speed set

32
Q

During beta range operation, which cams’ rotation moves the mechanical linkage to the center of the governor pilot valve?

A

Beta follow-up

33
Q

During alpha range operation, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent engine speed?

A

Speed set

34
Q

During an overspeed condition in the alpha range, the flyweights move the governor pilot valve to meter hydraulic fluid, which will?

A

Increase blade angle

35
Q

Once an overspeed condition is corrected and the pilot valve is returned to the center position, what is the result?

A

System is back on-speed

36
Q

During an underspeed condition, what moves the pilot valve?

A

Speeder spring

37
Q

When feathering the prop, what acts on the mechanical linkage to actuate the feather actuating valve?

A

Manuel feather cam

38
Q

During feathering operation, the feather valve is positioned to meter hydraulic fluid to the?

A

Forward end of the dome piston

39
Q

Which valve is a backup in case the feather valve fails during feathering operation?

A

Feather solenoid

40
Q

During feathering operation, which valve blocks off the standby pump output and causes hydraulic pressure to increase?

A

Feather actuating

41
Q

During feather operation, what range on psi of fluid pressure opens the pressure cutout switch contacts?

A

600 to 800

42
Q

Which component is the primary electrical ground for energizing the feather override holding coil?

A

Pressure cutout switch

43
Q

When attempting to unfeather the prop on flight, where must the throttle be positoned?

A

Above FLT IDLE

44
Q

Which two cams on the alpha shaft control the prop unfeathering operation?

A

Manual feather and beta set

45
Q

What is the minimum psi required to release the feather latches and allow the piston to move forward?

A

200

46
Q

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

Feather actuating valve

47
Q

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

A

Keeps the propellers rotating at the same speed

48
Q

What switches has spring-loaded guards to hold them in the NORMAL position?

A

Propeller governor control switches

49
Q

What percent rpm in the alpha range are fuel governing check switches used to reset the propeller governor?

A

106%

50
Q

On the speed bias motor, what results when the control winding voltage is different from the reference-winding voltage?

A

Speed bias motor rotates, and increases or decreases blade angle

51
Q

The master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel used by what propellers?

A

No. 2 and No. 3

52
Q

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

A

2%

53
Q

In mechanical governing mode, what causes the pilot valve to move and set the propeller speed?

A

Speeder spring or flyweights

54
Q

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

A

Normal and synchrophasing

55
Q

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?

A

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

56
Q

When an increase in rpm occurs during engine speed stabilization, how is an overspeed condition prevented?

A

Decrease speeder spring tension and position the pilot valve to increase blade angle

57
Q

How many slave channels are contained on the master synchrophaser board in the synchrophaser unit?

A

One

58
Q

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

A

Zero

Propellers And Small Gas Turbines (3 decks)

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