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self study > Fuel System > Flashcards

Fuel System Flashcards

1
Q

What is the order of priority for the fuel feed?

A

Fuel fed from the centre tank first, then the No1 and 2 tanks.

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2
Q

How many fuel pumps are there per tank and how are they powered?

A

2 electric pumps per tank

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3
Q

How are the pumps cooled and lubricated?

A

By fuel

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4
Q

Do the main tank or centre tank pumps operate at the higher pressure?

A

Centre tank pumps operate at higher pressure so that fuel is drawn from the centre tank before the main tanks

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5
Q

What do the individual pressure sensors do?

A

Monitor pressure output from each pump. Each centre tank pump will automatically shut off if low pressure is detected.

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6
Q

When may the low pressure lights flicker?

A

When fuel quantity is low and the aircraft is not in a level nose attitude

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7
Q

With low main tank pressure, how can fuel be supplied to the engine?

A

Fuel can be suction fed directly from the tanks. This bypass the electric pumps

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8
Q

What will happen if fuel is being suction fed during a climb?

A

Air pressure decreases resulting in dissolved air being released to the tank. This can cause fuel interruptions in the suction feed line leading to diminished thrust output or flameout

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9
Q

What are the main tank bypass valves also used for?

A

Suction defuelling

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10
Q

How long does it take for dissolved air in the suction feed line to dissipate?

A

Dependant on altitude, fuel temperature and fuel type

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11
Q

What powers the crossfeed valve?

A

DC battery bus

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12
Q

Where are the Spar fuel SOVs located and where are they powered from?

A

engine mounted wing stations, powered by DC hot battery bus

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13
Q

Where are the engine fuel SOVs powered from?

A

DC battery bus

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14
Q

How can the fuel SOVs be both closed?

A

Pulling the engine fire switches, engine start lever to cutoff

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15
Q

When do the centre tank fuel scavenge jet pumps activate?

A

Main tank No 1 FWD switch is ON and,
QTY is 1/2

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16
Q

Once the centre tank fuel scavenge jet pumps activate, how long do they operate for?

A

Remainder of the flight

17
Q

How do the centre tank fuel scavenge pumps work?

A

Ejector type pumps that use motive flow of fuel to create low pressure suction of fuel from one place to another

18
Q

Where is the fuel temperature sensor located?

A

In main tank No. 1

19
Q

Where is the SPP refuelling station located?

A

On the right wing

20
Q

What is the fuel capacity of the main tanks?

A

3.9t

21
Q

What is the fuel capacity of the centre tank?

A

13.06t

22
Q

What is the total fuel capacity?

A

20.86t

23
Q

What does the Nitrogen generation system do?

A

Converts bleed air to Nitrogen enriched air (NEA). This is then delivered to the centre tank to reduce flammability.

24
Q

When does the NGS activate?

A

After take off

25
Q

When does the NGS shut down? (6times)

A

after landing following a period of time or,
bleed air pressure lost or,
either engine not running or,
left pack overheat or,
smoke or fire detected in cargo or main deck areas or,
centre tank refuelling valve not open

26
Q

What does a blue NGS indicator light mean?

A

NGS is operational but performance degraded

27
Q

What does an amber NGS indicator light mean?

A

NGS is not operational

28
Q

When will a low fuel alert be displayed?

A

Main tank quantity decreases below 2000lbs.

29
Q

When will the low fuel alert clear?

A

Main tank quantity increases above 2500lbs

30
Q

When will a fuel configuration alert be displayed?

A

Centre tank quantity greater than 1600lbs and,
Centre tank pumps switched off or low pressure output

31
Q

When will a fuel configuration alert clear?

A

Both engines shut down or,

Centre tank fuel quantity less than 800lbs and,
One centre tank pump switch on or delivering pressure

32
Q

When will a fuel imbalance alert be issued?

A

1000lbs imbalance between main tanks

33
Q

When does a fuel imbalance alert clear?

A

200lbs imbalance

34
Q

How should the fuel pumps be configured for extended APU operation on the ground?

A

Either No 1 fuel tank pumps on. To draw from the centre tank, leave the left centre tank pump on which prevents a fuel imbalance. Must only be done with maintenance or flight deck crew on board.

35
Q

When must centre tank fuel not be used?

A

On the ground with <1000lbs of fuel
With flight deck unattended

36
Q

Where are the L and R pumps located in the centre tank?

A

L pump - forward section of tank
R pump - aft section of tank

self study (12 decks)

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