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C-2A > Power Plants > Flashcards

Power Plants Flashcards

1
Q

C2A Power Plant type

A

Two Allison T56-A-425

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2
Q

Power section

A

Compressor - Combustion - Turbine

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3
Q

Torquemeter

A

Connect the power section to the RGB.

*Provides a means to measure shaft horsepower.

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4
Q

R.G.B

A

Reduction gear box

Coverts high speed (13,820) low torque to low speed (1106) high torque prop output.

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5
Q

RGB contains?

A 
G enerator
H ydraulic
O il pumps
S tarter
T ach generator
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6
Q

Where is the Accessories drive housing located?

A

On the bottom of the Compressor section

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7
Q

Major assemblies of Accessories drive housing

A

Fuel control

Speed sense control

Speed sense valve

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8
Q

Engine control

A

Power levers

Condition levers

Coordinator

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9
Q

Safety device (RGB)

A

Negative torque signal (NTS)

Safety coupling

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10
Q

NTS - Negative torque signal

A

Prevent excessive prop drag if the engine is not developing sufficient power.

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11
Q

Safety coupling

A

Auto disengages the RGB from the power section if negative torque reach 1450 shaft horsepower (SHP).

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12
Q

Prop brake

A

Released by starter - above 22% RGB oil pressure.

Applied - rpm less than 20%

Locked - when prop attempts to turn backwards

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13
Q

Auto feathers (Auto FX)

A

Auto feather armed

Power lever above 75 degrees

Prop thrust below 500 lbs

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14
Q

LSGI

A

Low speed ground idle

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15
Q

LSGI operational characteristic

A

Reduce engine RPM to 70%
Active between 7-24 degree PLA

The switch located above master caution panel.

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16
Q

During LGSI, engine air is available for ECS and hyd reservoir press 14sec after engine accelerate past?

A

61 +/- 2%

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17
Q

What is Alpha ana Beta range?

A

Alpha - flight 100% Speed

Beta - ground ops / taxi

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18
Q

Major functional prop component?

A 
Spinner
Prop hub
Counterweight blades
Pump housing assembly
(PCA) Pitch change actuator
(EPC) Digital electronic prop control
(IOC) Integrated oil control
(AVM) Actuator valve module
(EVH) Electronic valve housing
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19
Q

Prop control?

A

Non rotating assembly mounted on the aft extension of prop hub.

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20
Q

Prop control contains?

A

Oil reservoir
Pumps
Valves
Control devices with hyd power

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21
Q

Spinner

A

Fiberglass assembly, provide air flow around the prop, ram air to cool prop oil control. Electric heating to provide anti ice when selected.

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22
Q

Prop blades consist of

A

Fiberglass shell
Graphite spar
Nickel sheath (prevent erosion)
Rubber heating pads (anti ice)

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23
Q

Prop pitch?

A

Determined by power lever position, maintain the prop and engine at a constant speed.

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24
Q

Prop pitch ops

A

Can only occur at blade angels of 63 to 19 degrees

Prevent decrease of blade angel

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25
Q

Engine instruments

A 
Torque indicators
TIT indicators
Tachometers
RGB oil press
Power oil press
Oil temp
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26
Q

Torque indicators

A

Receives input from the torque-meter.

Graduated 0-6000 horsepower

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27
Q

TIT indicators

A

18 thermocouples are used to sense engine tempt in the combustion section in degree centigrade 100 - 1200.

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28
Q

Tachometers

A

Indicate engine speed RPM % 100-13820. Electrical power

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29
Q

RGB oil press

A

The outlet of RGB pumps

0-300 psi

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30
Q

Power unit oil

A

Outlet of each power unit oil filter

0-100 psi

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31
Q

Oil temp

A

Received from temp bulb in the oil line.

Calibrate -70 to 150 degree

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32
Q

Fuel flow

A

0-2500 in 50 pounds per hours (PPH).

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33
Q

Fuel quantity

A

Co pilot side, 0-6500 lbs in 100 lbs increments.

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34
Q

Fire detection system

A

Both engine have fire detection circuits, monitor & indicate fire conditions.

If the warning light do not illuminate when tested, a failure of the detection system is indicated.

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35
Q

Fire extinguish system

A

Pulling the T-handle expose the fire button.

Pushing the switch detonates the 6.5 lbs of bromotrifluoromethane container. 350-750 psi

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36
Q

Engine fuel system

A

Contain 912 gal tank each wing.

Primary fuel JP5/F44

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37
Q

Engine driven fuel pump

A

Located in the accessories drive housing.

Deliver to fuel control unit.

Series and parallel

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38
Q

Series

A

The out put of secondary pump feed the inlet of the primary.

0-16% rpm no light and 65-100% no light.

If no primary pump light between 16-65% sec pump fail.

39
Q

Parallel

A

Primary and sec pump auto transferred between 16-65%rmp primary pump light illuminate.

If the light illuminate above 65% primary fail to close.

40
Q

Which engine driven fuel pump is use for flight ops?

A

Secondary pump is the primary pump for flight ops.

41
Q

Cross flow valve differential?

A

4 psi

42
Q

Fuel boost pumps

A

Two electrically operated are submerged in each fuel tank, one forward and aft.

Down to approximately 1% fuel remaining.

43
Q

Which pump provides a sustained fuel flow during period of negative G?

A

Aft boost pump.

44
Q

In what altitude engine driven fuel pumps can supply fuel flow for engine ops?

A

Below 6000ft, with all boost pump inoperative.

45
Q

How many boost pump enough to sustain both engine above 6000ft?

A

One

46
Q

Which boost pump is the only one power by left engine generator?

A

Port aft boost pump.

47
Q

Fuel control

A

Located port side each engine

Varies fuel flow, coordinated with prop angel and speed

Protecting from overspeed con

48
Q

Overspeed governor limits engine speed to?

A

104-108 % rpm

49
Q

Temp datum valve

A

Meter fuel flow (startup & accelerate)
Overspeed protection
Control in reverse
Permit total shutoff (manually or electrically)

50
Q

Coordinator

A

Coordinate fuel control, prop, electronic fuel trim system.

Calibrate 0-90 degree

Located behind the fuel control

51
Q

Fuel dump system

A

Both tanks down to 20% fuel remaining (12115lbs per tank) at 1300 lbs/min

52
Q

Electronic fuel trim

A

20% more fuel required for engine ops.

Temp limiting 0-60 degree coordinator (ground)

Temp controlling 60-100 (flight)

53
Q

In temp limiting, what degree of TIT limiting temp to shutdown the engine. Preventing engine fire.

A

850 degree

54
Q

Temp datum control

A

Temp datum valve responds to signals sent by temp datum. Trim the necessary amount of fuel during start and when engine speed reach 94%.

55
Q

Manifold drain valve

A

Drain at shutdown, below 9psi.

Close by speed sense control through the ignition relay at 16% rpm during start

Held close by fuel press

56
Q

Fuel enrichment

A

Provide increase fuel flow and extreme cold condition.

57
Q

Fuel enrichment by?

A

Switch on

Engine speed above 16%

Fuel manifold below 50 psi

58
Q

Engine oil system

A

Provide the power section and the RGB with sufficient oil lubrication and cooling.

59
Q

Engine oil tank

A 
12 gal
Service to 8
6.2 gal useable 
Below 4.3 oil low light 
3.3 gal 8sec neg g baffle
60
Q

The engine oil system consist of three section:

A

Pressure, scavenge, and breather sections.

61
Q

What the scavenge do?

A

Collects the used oil, cools it, and returns it to the oil tank.

62
Q

The maximum allowable oil consumption is?

A

0.35 GPH

63
Q

MIL-L-7808

A

Cold oil

64
Q

Metal chip detector system

A

Two per engine on the RGB and the power section of each engine oil system

65
Q

Engine controls

A

Power levers

Condition levers

66
Q

Power levers

A

0-90 degree

Beta range 0-34
Alpha range 34-90

67
Q

Condition levers

A

Overrides all power lever commands

Air start
Run
Ground stop
Feather

68
Q

Flight idle stop solenoid

A

Prevents power lever movement below flight idle in flight

69
Q

How many interconnected liner in the combustion section?

A

6

70
Q

Spark igniters located in # ___ & # ___ combustion liners.

A

2:5

71
Q

Fifth and tenth stage bleed air system

Nickel and dime

A

Bleed air valves are installed to prevent compressor stall during start

Open until 94 percent during start

72
Q

Compressor bleed air system

A

14 stage bleed air in the compressor section

73
Q

14 stage bleed air used for?

A 
Cross bleed air
Oil cooler ejector
Hyd reservoir press 45+/-5(head press)
Deicing
Defogging 
AC/ECS
Pressurization
74
Q

Engine anti icing

A

From 14 stage bleed air

75
Q

De fueling will terminate with ____ gal remaining.

A

4 gal / 1%

76
Q

Type of oil

A

MIL-L-23699

77
Q

Oil servicing should be accomplished with in ____ min, past that ____ min penalty run to heat up the oil.

A

10 : 30

78
Q

Propeller servicing

A

MIL-PRF-83282

79
Q

Engine fire extinguisher contains

A

6.1/2 bromotrifluoromethane

35-75 Psi

80
Q

Dump fuel approximately

A

1300 lb/min

81
Q

The fuel dump system permit jettisoning fuel from both tanks to approximately ____ %fuel remaining.

A

20% (1215 lb)

82
Q

The engine has?

A

Reduction gear assembly
14 stage axial flow compressor
6 interconnected combustion liners
4 stage turbine

83
Q

What used to crank the engine during normal starting?

A

A pneumatic starter

84
Q

What fire the fuel air mixture in no. 2 and no. 5 combustion liner?

A

The igniter plugs

85
Q

The fuel air mixture in the other four liners is ignited through what?

A

Crossover tubes

86
Q

What the coordinator do?

A

Coordinates the operation of the fuel control, propeller, and the electronic fuel trimming system.

87
Q

What are the main units of engine fuel system?

A

Engine driven fuel pump
Fuel control unit
Electronic fuel trim system

88
Q

What are the three pump assembly elements?

A

Centrifugal boost pump

Spur-gear-type prim&sec

89
Q

What control by the electronic fuel trim system?

A

TIT, thereby controlling engine power output.

90
Q

Power lever is less than 0-66 degrees coordinator position?

Above 66-90 degrees?

(Engine speed rises above 94% rpm)

A

Temp limiting

Temp controling

91
Q

The datum control is fed the TIT data from where?

A

The engine thermocouples and a reference temp valve (datum).

92
Q

What the temp datum do?

A

To control fuel flow allowing the electronic fuel trim system to bring the temp back on schedule by .

93
Q

What power the temp datum control (electronic amplifier)

A

Essential AC bus no.1

MEDB ROW 2 a and b

94
Q

The 5 forces acting on the prop are?

A

Centrifugal force, centrifugal twist, aerodynamic twist, thrust bending and torque bending

C-2A (15 decks)

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