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For a planned flight the calculated fuel is as listed below. How much fuel should be aboard to cover the rest of the flight, if the remaining flight time to destination is 1 hour 45 minutes?

Trip Fuel: sufficient for a planned flight time of 4 hours 45 minutes
Operator’s specified Reserve Fuel: 30% of the planned Trip Fuel
Start up and Taxi Fuel: 35 kg
Block Fuel: 890 kg

  • A
    475 kg
  • B
    242 kg
  • C
    315 kg
  • D
    440 kg

Take Off Fuel (TOF) = Block Fuel – (Start Up + Taxi Fuel)
TOF = 890 kg – 35 kg = 855 kg

Reserve fuel = 30 % of the planned Trip Fuel
Flight Time: 4h 45 min = 4.75 h
Therefore, Reserve fuel = 4.75 h x 0.3 = 1.425 h
Total fuel onboard sufficient for = 4.75 h + 1.425 h = 6.175 h


Next step: calculate the Fuel Consumption.
Fuel Consumption = 855 kg / 6.175 h = 138.5 kg/h
Fuel burnt until 1h 45 min left:
4 h 45 – 1 h 45 = 3 h
3 h x 138.5 kg/h = 415.5 kg
  • Fuel left for 1 h 45:
855 kg – 415.5 kg = 439.5 kg

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