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C-2A > Power Plants > Flashcards

Power Plants Flashcards

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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
Engine instruments
``` Torque indicators TIT indicators Tachometers RGB oil press Power oil press Oil temp ```
26
Torque indicators
Receives input from the torque-meter. Graduated 0-6000 horsepower
27
TIT indicators
18 thermocouples are used to sense engine tempt in the combustion section in degree centigrade 100 - 1200.
28
Tachometers
Indicate engine speed RPM % 100-13820. Electrical power
29
RGB oil press
The outlet of RGB pumps | 0-300 psi
30
Power unit oil
Outlet of each power unit oil filter 0-100 psi
31
Oil temp
Received from temp bulb in the oil line. Calibrate -70 to 150 degree
32
Fuel flow
0-2500 in 50 pounds per hours (PPH).
33
Fuel quantity
Co pilot side, 0-6500 lbs in 100 lbs increments.
34
Fire detection system
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.
35
Fire extinguish system
Pulling the T-handle expose the fire button. | Pushing the switch detonates the 6.5 lbs of bromotrifluoromethane container. 350-750 psi
36
Engine fuel system
Contain 912 gal tank each wing. Primary fuel JP5/F44
37
Engine driven fuel pump
Located in the accessories drive housing. Deliver to fuel control unit. Series and parallel
38
Series
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
Parallel
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
Which engine driven fuel pump is use for flight ops?
Secondary pump is the primary pump for flight ops.
41
Cross flow valve differential?
4 psi
42
Fuel boost pumps
Two electrically operated are submerged in each fuel tank, one forward and aft. Down to approximately 1% fuel remaining.
43
Which pump provides a sustained fuel flow during period of negative G?
Aft boost pump.
44
In what altitude engine driven fuel pumps can supply fuel flow for engine ops?
Below 6000ft, with all boost pump inoperative.
45
How many boost pump enough to sustain both engine above 6000ft?
One
46
Which boost pump is the only one power by left engine generator?
Port aft boost pump.
47
Fuel control
Located port side each engine Varies fuel flow, coordinated with prop angel and speed Protecting from overspeed con
48
Overspeed governor limits engine speed to?
104-108 % rpm
49
Temp datum valve
Meter fuel flow (startup & accelerate) Overspeed protection Control in reverse Permit total shutoff (manually or electrically)
50
Coordinator
Coordinate fuel control, prop, electronic fuel trim system. Calibrate 0-90 degree Located behind the fuel control
51
Fuel dump system
Both tanks down to 20% fuel remaining (12115lbs per tank) at 1300 lbs/min
52
Electronic fuel trim
20% more fuel required for engine ops. Temp limiting 0-60 degree coordinator (ground) Temp controlling 60-100 (flight)
53
In temp limiting, what degree of TIT limiting temp to shutdown the engine. Preventing engine fire.
850 degree
54
Temp datum control
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
Manifold drain valve
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
Fuel enrichment
Provide increase fuel flow and extreme cold condition.
57
Fuel enrichment by?
Switch on Engine speed above 16% Fuel manifold below 50 psi
58
Engine oil system
Provide the power section and the RGB with sufficient oil lubrication and cooling.
59
Engine oil tank
``` 12 gal Service to 8 6.2 gal useable Below 4.3 oil low light 3.3 gal 8sec neg g baffle ```
60
The engine oil system consist of three section:
Pressure, scavenge, and breather sections.
61
What the scavenge do?
Collects the used oil, cools it, and returns it to the oil tank.
62
The maximum allowable oil consumption is?
0.35 GPH
63
MIL-L-7808
Cold oil
64
Metal chip detector system
Two per engine on the RGB and the power section of each engine oil system
65
Engine controls
Power levers Condition levers
66
Power levers
0-90 degree Beta range 0-34 Alpha range 34-90
67
Condition levers
Overrides all power lever commands Air start Run Ground stop Feather
68
Flight idle stop solenoid
Prevents power lever movement below flight idle in flight
69
How many interconnected liner in the combustion section?
6
70
Spark igniters located in # ___ & # ___ combustion liners.
2:5
71
Fifth and tenth stage bleed air system | Nickel and dime
Bleed air valves are installed to prevent compressor stall during start Open until 94 percent during start
72
Compressor bleed air system
14 stage bleed air in the compressor section
73
14 stage bleed air used for?
``` Cross bleed air Oil cooler ejector Hyd reservoir press 45+/-5(head press) Deicing Defogging AC/ECS Pressurization ```
74
Engine anti icing
From 14 stage bleed air
75
De fueling will terminate with ____ gal remaining.
4 gal / 1%
76
Type of oil
MIL-L-23699
77
Oil servicing should be accomplished with in ____ min, past that ____ min penalty run to heat up the oil.
10 : 30
78
Propeller servicing
MIL-PRF-83282
79
Engine fire extinguisher contains
6.1/2 bromotrifluoromethane 35-75 Psi
80
Dump fuel approximately
1300 lb/min
81
The fuel dump system permit jettisoning fuel from both tanks to approximately ____ %fuel remaining.
20% (1215 lb)
82
The engine has?
Reduction gear assembly 14 stage axial flow compressor 6 interconnected combustion liners 4 stage turbine
83
What used to crank the engine during normal starting?
A pneumatic starter
84
What fire the fuel air mixture in no. 2 and no. 5 combustion liner?
The igniter plugs
85
The fuel air mixture in the other four liners is ignited through what?
Crossover tubes
86
What the coordinator do?
Coordinates the operation of the fuel control, propeller, and the electronic fuel trimming system.
87
What are the main units of engine fuel system?
Engine driven fuel pump Fuel control unit Electronic fuel trim system
88
What are the three pump assembly elements?
Centrifugal boost pump | Spur-gear-type prim&sec
89
What control by the electronic fuel trim system?
TIT, thereby controlling engine power output.
90
Power lever is less than 0-66 degrees coordinator position? Above 66-90 degrees? (Engine speed rises above 94% rpm)
Temp limiting Temp controling
91
The datum control is fed the TIT data from where?
The engine thermocouples and a reference temp valve (datum).
92
What the temp datum do?
To control fuel flow allowing the electronic fuel trim system to bring the temp back on schedule by .
93
What power the temp datum control (electronic amplifier)
Essential AC bus no.1 | MEDB ROW 2 a and b
94
The 5 forces acting on the prop are?
Centrifugal force, centrifugal twist, aerodynamic twist, thrust bending and torque bending

C-2A (15 decks)

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