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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 25 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: 735 kg

  • A
    322 kg
  • B
    341 kg
  • C
    357 kg
  • D
    161 kg
Take off fuel = Block fuel – (start up + taxi fuel)

TOF = 735 kg – 35 kg = 700 kg

Reserve fuel = 30 % of the planned Trip Fuel

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 consumption.

Consumption = 700 kg / 6.175 h = 113.4 kg/h

Fuel burnt until 1h 25 min left:

4 h 45 – 1 h 25 = 3 h 20
3 h 20 x 113.4 kg/h = 378 kg
  • Fuel left for 1 h 25:
700 kg – 378 kg = 322 kg

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