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The following data for a flight of a twin engine jet aircraft are provided for the calculation:

Maximum landing mass = 51 300 kg
Maximum allowable take off mass = 56 300 kg
Dry operating mass = 29 100 kg
Load = 11 700 kg
Trip fuel = 3000 kg
Cont. fuel = 215 kg
Final reserve fuel = 1250 kg
Alternate fuel = 1300 kg
Taxi fuel = 200 kg

Determine the maximum possible extra fuel that can be uplifted for this flight.

  • A
    5765 kg.
  • B
    7535 kg.
  • C
    9735 kg.
  • D
    7735 kg.
ZFM = DOM 29 100 kg + load 11 700 kg = 40 800 kg
Take-off fuel (TOF) = TF 3 000 kg + CF 215 kg + FR 1 250 kg + AF 1 300 kg = 5 765 kg

TOM = ZFM 40 800 kg + TOF 5 765 kg = 46 565 kg

Maximum landing mass 51 300 kg + TF 3 000 kg = 54 300 kg (this mass must not be exceeded!)
54 300 kg is lower than the maximum allowable TOM of 56 300 kg, therefore 54 300 kg is limiting.

Possible extra fuel = 54 300 kg - 46 565 kg = 7 735 kg

Note : Don't forget that the taxi fuel is not part of the take-off fuel! The take-off fuel is the fuel contained at the beginning of the take-off (on the runway). At this location, taxi fuel has already been burned off. If you add the taxi fuel, your result would be 7 535 kg (one of the wrong answers).

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