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For a planned flight the calculated fuel is as follows:

Trip fuel: sufficient for a planned flight time of 5 h 25 min
Reserve fuel: 30% of the planned trip fuel
Start up and taxi fuel: 12 kg
Block fuel: 945 kg

How much fuel should remain after a flight time of 4 h?

  • A
    467 kg
  • B
    403 kg
  • C
    451 kg
  • D
    244 kg

Take Off Fuel (TOF) = Block Fuel – (Start Up + Taxi Fuel)
TOF = 945 kg – 12 kg = 933 kg

Reserve fuel = 30 % of the planned Trip Fuel
Flight Time: 5 h 25 min = 5.42 h
Therefore, Reserve fuel = 5.42 h x 0.3 = 1.63 h
Total fuel onboard sufficient for = 5.42 h + 1.63 h = 7.05 h

Next step: calculate the Fuel Consumption.
Fuel Consumption = 933 kg / 7.05 h = 132 kg/h
  • Fuel burnt after a 4 h flight:
4 h x 132 kg/h = 528 kg
  • Fuel left after a 4 h flight:
933 kg – 528 kg = 405 kg

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