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For a planned flight the calculated fuel is as follows:

Trip fuel: sufficient for a planned flight time o 4 h 24 min
Reserve fuel: 30% of the planned trip fuel
Start up and Taxi fuel: 15 kg
Block fuel: 138 kg

How much fuel should remain after a flight time of 3 h 18 min?

  • A
    53 kg
  • B
    59 kg
  • C
    31 kg
  • D
    68 kg

Take Off Fuel (TOF) = Block Fuel – (Start Up + Taxi Fuel)
TOF = 138 kg – 15 kg = 123 kg

Reserve fuel = 30 % of the planned Trip Fuel
Flight Time: 4 h 24 min = 4.4 h
Therefore, Reserve fuel = 4.4 h x 0.3 = 1.32 h
Total fuel onboard sufficient for = 4.4 h + 1.32 h = 5.72 h

Next step: calculate the Fuel Consumption.
Fuel Consumption = 123 kg / 5.72 h = 21.5 kg/h
  • Fuel burn after a 3 h 18 min flight:
3 h 18 x 21.5 kg/h = 71 kg
  • Fuel left after a 3 h 18 flight:
123 kg – 71 kg = 52 kg

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