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B737 > Fuel > Flashcards

Fuel Flashcards

1
Q

what order does the fuel feed

A

1) center tank
2) respective main tanks

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2
Q

to what fuel tank does the NGS supply nitrogen

A

center tank

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3
Q

when does the NGS operate

A

from takeoff until a short period after landing (during taxi in)

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4
Q

when will the NGS auto shutdown

A
  • A/C on the ground and not in test mode
  • either engine is not running in-flight
  • fire/smoke detection in cargo or main deck areas
  • left pack overheat
  • CTR TK refuel valve OPEN
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5
Q

what is the only indication of for the NGS and where is it located

A

operability indicator located on the main wheel well

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6
Q

how many fuel pumps are there

A

6:
- 2 center tank pumps
- 2 main tank pumps no.1 (FWD & AFT)
- 2 main tank pumps no.2 (FWD & AFT)

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7
Q

which pumps have a higher output pressure

A

center tank pumps

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8
Q

when will the center tank pumps automatically shutoff

A

a short delay after “low pressure” lights illuminate

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9
Q

how long can the center tank “low pressure” lights flicker for before the alert is triggered

A

up to 5 minutes

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10
Q

what other methods are there for drawing fuel from the main tanks apart from the main tank pumps (e.g. low output pressure)

A

each engine can draw fuel from its corresponding main tank through a suction feed line that bypasses the tank pumps

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11
Q

what is a limitation with regards to the suction fuel feed line

A

during climb, dissolved air in the fuel may be sucked into the suction feed line which may restrict fuel flow (eventually depletes in the cruise)

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12
Q

what causes the spar fuel shutoff and engine fuel shutoff valves to close

A
  • engine fire switch - pulled; or
  • engine start lever - cutoff
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13
Q

what switch controls the center tank fuel scavenge jet pump

A

main tank fuel pump no.1 forward switch

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14
Q

how does the center tank fuel scavenge jet pump operate

A
  • transfers the remaining ‘center tank’ fuel to main tank no.1
  • transfer begins when main tank no.1 qty = half
  • operates for the remainder of the flight
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15
Q

what tank is the fuel temperature indicator’s sensor in

A

main tank no.1

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16
Q

how is the APU fed fuel

A
  • when AC pumps are operating = APU fuel comes from the left side of the fuel manifold
  • when AC pumps are NOT operating = APU fuel comes from the suction feed of main tank no.1
17
Q

what are the main tanks’ useable fuel quantities (L/kg)

A

4876L = 3915kg @ 0.8029SG

18
Q

what is the center tank’s usable fuel quantity

A

16,263L = 13,066kg @ 0.8029SG

19
Q

what is the total useable fuel quantity

A

26,025L @ 20,896kg @ 0.8029SG

20
Q

“ENG VALVE CLOSED”/”SPAR VALVE CLOSED” lights:
- illuminated (bright/dim)
- extinguished

A

illuminated:
- bright = valve in transit or not in commanded position by the engine fire switch or engine start level
- dim = valve is closed
extinguished = valve is open

21
Q

crossfeed “VALVE OPEN” light:
- illuminated (bright/dim)
- extinguished

A

illuminated:
- bright = valve in transit OR valve not in commanded position
- dim = valve is open
extinguished = valve is closed

22
Q

“FILTER BYPASS” light:
- illuminated
- extinguished

A
  • illuminated = impending fuel filter bypass due to contaminated filter
  • extinguished = fuel filter operating normally
23
Q

center tank fuel pumps “LOW PRESSURE” lights:
- illuminated
- extinguished

A
  • illuminated = pump output pressure is low AND sw is ON
    note: with pump switch on - continuous low pressure for 10 seconds = MC + ‘FUEL’
  • extinguished = pump output pressure is normal OR sw is OFF
24
Q

main tanks fuel pumps “LOW PRESSURE” lights:
- illuminated
- extinguished

A
  • illuminated = pump output pressure is low OR sw is OFF
    note: 1 illuminated on same side = MC + ‘FUEL’ on recall
    2 illuminated on same side = MC + ‘FUEL’
  • extinguished = fuel pump output pressure is normal
25
Q

fuel pump switches:
- ON
- OFF

A
  • ON = activates fuel pump
  • OFF = activates fuel pump
    note: when the center tank fuel pump is turned off the auto shutoff logic is reset (therefore if the switch is turned on after being selected off the pumps will run until the auto shutoff logic trips the pumps off)
26
Q

fuel “LOW” alert:
- trigger
- remains until

A
  • fuel qty < 907kg in related main tank
  • remains until qty > 1134kg in main tank
27
Q

fuel “CONFIG” alert:
- trigger
- remains until

A

triggers:
- either engine running
- center tank qty > 726kg; and
- both center fuel tank pump sw - OFF
remains until:
- both engines not running
- center tank qty < 363kg
- 1 center tank pump sw - ON

28
Q

fuel “IMBAL” alert

A
  • main tanks differ > 453kg
  • displays below main tank with lower fuel quantity
  • displays when plane is in the air or on the ground
  • inhibited by LOW indication when both exist
  • displayed until imbalance is < 91kg

B737 (10 decks)

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