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Given the following information, calculate the estimated Landing Mass at the destination alternate for the Commercial Air Transport flight with a Performance Class A aeroplane. Assume the Basic Fuel Scheme WITHOUT variations applies.

DOM: 33 000 kg
Traffic load: 8110 kg
Final Reserve Fuel: 983 kg
Destination Alternate Fuel: 1100 kg
Contingency Fuel: 102 kg (not consumed)
Extra fuel: 0 kg
Discretionary Fuel: 0 kg

  • A

    41 110 kg.

  • B

    42 210 kg.

  • C

    42 195 kg.

  • D

    42 312 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.


TAKE-OFF MASS (TOM) - The mass of the aeroplane including everything and everyone contained within it at the start of the take-off run.

=> Take-Off Mass (TOM) = Dry Operating Mass (DOM) + Traffic Load (TL) + Take off Fuel (TOF)*

  • TOF * = Trip Fuel + Contingency Fuel + Alternate Fuel + Final Reserve

LANDING MASS (LM) - As we reach our Destination, we will have consumed Trip fuel. Therefore, Landing mass equals Take-off Mass minus Trip Fuel.

=> Landing Mass (LM) = Take off Mass (TOM) - Trip Fuel; or
Landing Mass (LM) = Dry Operating Mass (DOM) + Traffic Load (TL) + Contingency Fuel + Alternate Fuel + Final Reserve


LANDING MASS AT ALTERNATE - As we reach our Alternate, we will have consumed Trip fuel and Alternate Fuel. Therefore, Landing mass at alternate equals Landing mass minus alternate fuel.

=> Landing Mass at Alternate = Landing Mass (LM) - Alternate Fuel; or
Landing Mass at Alternate = Dry Operating Mass (DOM) + Traffic Load (TL) + Contingency Fuel + Final Reserve
Landing Mass at Alternate = 33 000 kg + 8110 kg + 102 kg + 983 kg = 42 195 kg

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