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Dash 1 > Engine and Fuel Systems > Flashcards

Engine and Fuel Systems Flashcards

1
Q

What does the engine-driven fuel pump do?

A

provides high pressure fuel to fuel control unit

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2
Q

What happens if the engine driven fuel pump fails?

A

no engine

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3
Q

What happens is speed lever is < 99.4%, the aircraft is faster than 50 kias and not in cruise mode?

A

“Speed lever - Low” warning in HDD

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4
Q

At what RPM does the EFIU signal the ESM to open the fuel shutoff valve?

A

10% RPM

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5
Q

Negative torque is generated when an engine flames out during flight and the propeller begins to windmill. The windmilling propeller will generate a large amount of drag until the propeller blades can be feathered. How does the NTS system provides temporary relief from this situation?

A

The NTS, by itself will cause blade pitch to cycle. As propeller RPM slows, the feathering valve will begin to close and the blade angle will begin to increase until propeller RPM gets too high, then the feather cycle will begin again.

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6
Q

Closed loop power comes on automatically any time ______ hold is on.

A

altitude

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7
Q

When failed torque loop or failed DEEC

mode, while altitude hold is on, the pilot’s engine speed command will be ignored and the engine will go to ___% RPM.

A

100%

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8
Q

Engine speed control can be returned to pilot speed lever commands by turning off _______ hold.

A

altitude

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9
Q

Closed loop power defaults to ON, but is not

active until…?

A

power level is at or above flight idle and engine speed is greater than 80%.

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10
Q

During startup, a speed switch in the DEEC notifies the EFIU that engine RPM is above __%. The EFIU then sends an ignition activation signal to the ESM, which switches 28 VDC power to the ignition unit. A pilot indication of these events is ________and _________ just after reaching 10% RPM.

A

RPM is above 10%

positive fuel flow and a rise in EGT

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11
Q

If RPM drops below ___%, it automatically performs an in-flight restart.

A

78%

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12
Q

Based on OAT and density altitude, backup mode will limit power commands so that torque does not
exceed ___%.

A

70%

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13
Q

Speed lever should be set to ___% before returning

to DEEC Mode from backup

A

100%

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14
Q

What are the three ways the UARB network connects to the engine?

A
  1. directly through the throttle and stop/feather servos
  2. EFIU
  3. DEEC
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15
Q

What does the detent position of the condition lever do?

A

the fuel shutoff valve

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16
Q

The critical speed range is from __% to __%.

A

18-28%

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17
Q

How many fuel tanks?

A

7

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18
Q

Where are vent valves located?

A

Vent valves are located in each fuel tank at the highest point in the tank and allow vapor in the tank to escape.

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19
Q

Where do vapors collected in the vent box go?

A

left inboard

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20
Q

When aircraft bank angle is __° or greater, the

tilt valve will keep the vent closed so that tank pressurization is not lost when the float drops due to bank angle.

A

10

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21
Q

The DEEC controlled engine inflight ops range

A

82-100.5%

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22
Q

DEEC lockout range

A

89.5-92.5% (DEEC will actually set 89% or 93%)

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23
Q

Engine dry weight

A

375 lb

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24
Q

Engine installed weight with prop

A

525 lb

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25
Q

horsepower

A

900 SHP

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26
Q

Jet thrust

A

157 lb max continuous

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27
Q

total takeoff thrust

A

2000 lb (standard day, sea level)

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28
Q

reverse thrust

A

700 lb (standard day, sea level)

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29
Q

reduction gear box ratio

A

26:1

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30
Q

The primary fuel nozzles use _______atomization while the secondary use ________atomization.

A

orifice and air blast

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31
Q

what allows the fuel system to automatically provide extra fuel to the engine during startup without going through the fuel control unit?

A

enrichment circuit

32
Q

How many thermocouples comprise the EGT harness?

A

8

33
Q

how is EGT measured by the DEEC?

A

The delta pressure ratio transducer measures the ratio between compressor inlet px (Ps2) and the exhaust gas px (Ps5) and supplies the representative voltage to the DEEC. Actual EGT limits for the engine vary with temperature and density altitude. The DEEC calculated temp allows for one set of limits IE Single Red Line (SRL or SEGT) value. If DEEC fails or is disabled reference EGT limit chart in Section 5

34
Q

what does closed loop power do?

A

provides linear throttle response by using engine torque as a feedback signal and automatically adjusting engine power to match the throttle setting.

35
Q

closed loop power can be turned off by the pilot but comes on automatically when…

A

any time altitude hold is turned on

36
Q

if closed loop power becomes non-op, the pilots engine speed command will be ignored and the engine will go to ____% RPM. How can pilot regain control of the speed lever?

A
  1. turn off altitude hold
37
Q

what is displayed in status area if C/L power is disabled or failed?

A

black text “power lever”

38
Q

C/L power defaults to on but is not active until…

A

power level is at or above flight idle AND engine speed is greater than 80%

39
Q

the ignition unit and starter are automatically deactivated at the end of the start cycle at ___% RPM

A

60

40
Q

If RPM drops below ___% inflight, the RCM sends a signal to the EFIU and an automatic restart is activated

A

78

41
Q

when DEEC in backup mode, power commands are limited as a function of _______ and ________ so that torque does not exceed ____ %

A

OAT and density altitude, 70%

42
Q

True/False. In backup mode, reverse thrust is limited

A

true

43
Q

The UARB network connects to the engine components in one of the following 3 ways:

A

directly to the throttle and stop/feather servos
through the DEEC
through the EFIU

44
Q

what does the condition lever do in the detent position?

A

closes the fuel shutoff valve

45
Q

what does the condition lever do in the full aft position?

A

mechanically feathers prop and closes the fuel shutoff valve

46
Q

what does the speed lever do?

A

sends RPM command to DEEC, DEEC controls torque motor which sets prop governor in order to achieve the commanded speed

47
Q

what does setting GCS ignition hot do?

A

activates the electric fuel pumps

48
Q

what is the critical speed range (RPM)?

A

18-28%. accel/deceleration through range is 1%/ second

49
Q

what happens during an inflight restart if RPM is less than 60%

A

EFIU turns on the unfeather pump

50
Q

what happens if the aircraft goes lost link with the engine shut down?

A

igniters are forced on and the system attempts a restart even if the engine was shut down prior to the lost link condition

51
Q

the outboard wing tanks ______ feed to the inboard wing tanks

A

gravity

52
Q

how many fuel tanks. where located?

A
  1. 3 fuselage, 4 wing
53
Q

calculated fuel is computed by the RCM based on…

A

loaded fuel level minus flow rate data, then proportionately distributed to the tanks

54
Q

a red fuel leak warning occurs when…

A

wing probe indicates 200 lbs below calculated or forward/aft probe indicates 250 lbs below calculated

55
Q

which tanks have float switches?

A

forward, aft, and inboard wing tanks

56
Q

how many jet pumps? where are they located?

A
  1. forward, aft and inboard wing tanks
57
Q

how many valves on fuel feed manifold?

A

4

58
Q

where is unused fuel from the header tank returned to?

A

the tank it came from via the return solenoid

59
Q

how many vent valves and where are they located?

A

in each fuel tank at highest point to allow vapor to escape

60
Q

any liquid collected in the vent box is routed to the…

A

inboard left wing tank

61
Q

forward tank fuel load

A

1300

62
Q

header tank fuel load

A

204

63
Q

aft tank fuel load

A

790

64
Q

wing tank fuel load (per side)

A

735

65
Q

unusable fuel

A

1-2% (60lbs)

66
Q

how is fuel level calculated after jettison?

A

known dump rate multiplied by time elapsed, then subtract from fuel quantity prior to jettison

67
Q

mass flow sensor is accurate to +/-

A

10lbs / hr

68
Q

how many watts are the electric fuel heaters? How many elements in each heater? When do they activate?

A

600 watts. 2 elements. 1st element on < 10C and off at >13 C for more than 10 sec. 2nd element on <5C and off >8C for more than 10 sec

69
Q

how many sides does the forward tank have?

A

2

70
Q

fuel is initially drawn from the ________ and ______ tank only over a ____ sec period. After two ____ sec cycles, fuel is drawn from the _______ and _____ tanks over a ____ sec period.

A

forward and wing tanks over 300 sec. 300 sec. forward and aft over 100 sec

71
Q

Fuel pumps are operated for _____ minutes each with a ____sec overlap

A

20 minutes. 10 sec

72
Q

If fuel feed px drops below ___ psi for more than __ sec, the RCM will perform a __ sec reset of the active fuel pump and reset the ___ min switching timer.

A

15psi, 5 sec, 1 sec, 20 min

73
Q

what happens after a second fuel pump reset cycle if pressure is still below 15 psi?

A

pump fail warning downlinked and both pumps commanded on for remainder of flight

74
Q

what happens if both elec pumps fail?

A

engine runs til fuel in header is depleted

75
Q

is it possible to jettison fuel with both elec pumps are failed?

A

no

76
Q

if header tank px exceeds X.X psi, Fuel Tank Header-over-pressurized downlinked to GCS

A

4.6

77
Q

if longitudinal CG is more than __ inches from set location or the lateral CG is more than __ in from set location a warning is downlinked to GCS

A

3 or 1

Dash 1 (4 decks)

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