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12 Cards in this Set
- Front
- Back
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Fuel pumps are powered by which system?
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Fuel pumps are AC powered
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How is fuel supplied in the event that normal electrical fuel pump power is lost? Which tanks is suction feed available from?
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Fuel pumps provide suction feeding in the event that normal electrical power is lost.
Suction feed is available from Main tanks 1 & 2 only. (NO CENTRE TANK SUCTION FEED !) |
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Eninge shutoff valve and spar shut off valve is powered by which system, off which bus?
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Both valves are operated b y the DC system and powered by the hot battery bus
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Explain how fuel is prioritised from centre tank first.
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The centre tank pumps produce a higher pressure than main tank pumps allowing fuel form the centre tank to be used first
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Fuel for the APU is provide from which tank? If AC fuel pumps are not operating how is this fuel supplied?
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Fuel for the APU comes from Main tank 1 and is supplied by AC powered fuel pump.
If the pump is not available, suction feeding is provided. |
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When does the scavenge pump work for centre tank and how long does it work for?
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The scavenge pump operates once the Main tanks are about half (approx 1900kgs). Once the pump starts it continues for the whole flight.
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In which tank does the fuel from the scavenge pump go?
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Main tank 1
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Where is the fuel temp measured and what are the limits?
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Fuel temp is measured in Main tank 1.
Max +49 C Min -43 C (NG) |
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Max capacity useable fuel in each tank and total (0.79 SG)?
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Main tank - 3900kg
Centre tank - 12900kg Total - 20700kg |
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Explain LOW fuel indication
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LOW indication occurs when either main tank is below 907kg. It is displayed untill quantity incrases to 1134kg
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Explain CONFIG indication
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CONFIG indication occurs with quantity greater then 726kg in centre tank and engine running, centre tanks pumps off or low psi. Inhibited when centre tank quantity is < 363kg
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Explain IMBAL indication
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IMBAL indication occurs when main tanks differ by 453kg or more. It is displayed until imbalance is reduced to 91kg. Inhibited on the ground or by LOW fuel indication.
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