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Given the following information, what fuel is required to be on board before engine start for a Commercial Air Transport flight?

APU fuel flow: 150 kg/h
Taxi fuel flow: 11 kg/minute
APU time: 38 minutes
Taxi: 13 minutes
Trip fuel (including contingency): 4 250 kg
Alternate and Final Reserve fuel: 3 730 kg
Extra Fuel: 0 kg
Discretionary Fuel: 0 kg

  • A
    8 220 kg
  • B
    7 980 kg
  • C
    4250 kg
  • D
    8 075 kg

IMPORTANT NOTE: The modifications resulting from the updated fuel policy regulations, which came into effect on October 30, 2022, are only changes in wording but nothing really new. The terminology "extra fuel" has been replaced with "discretionary fuel." EASA has clarified that the calculations and procedures pertaining to fuel calculations will remain unchanged, and there will be no new questions regarding the new "extra fuel" concept.

  • extra fuel, include anticipated delays or specific operational constraints that can be predicted
  • discretionary fuel, include a quantity at the sole discretion of the commander

For reference, additional information can be found in EASA's AIR OPS documentation.


Commercial airplane fuel calculations:
Taxi - Trip - Contingency - Alternate - Additional - Final reserve - Extra fuel

Taxi:
APU fuel (38 minutes) = (38 / 60) x 150 = 95 kg
Taxi fuel (13 minutes) = 13 x 11 = 143 kg

Trip + Contingency = 4250 kg

Alternate and final reserve = 3730 kg
Additional fuel: Not needed as there’s alternate fuel available.

Block off fuel = 95 + 143 +4250 + 3730 = 8218 kg ≈ 8220 kg

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