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Given the following information, calculate the total fuel required and total endurance, assuming 30 minutes final reserve fuel:

Distance: 200 NGM
TAS: 115 kt
Wind: 10 kt headwind
Fuel consumption: 3 kg/min

  • A

    500 kg; 2 hours 24 minutes

  • B

    433 kg; 1 hour 54 minutes

  • C

    334 kg; 3 hours 30 minutes

  • D

    433 kg; 2 hours 24 minutes

Total Endurance is the total time that the aircraft can remain airborne burning all usable fuel, including final reserve fuel.

Safe Endurance is the total time that the aircraft can remain airborne burning all usable fuel, apart from final reserve fuel.

1. Groundspeed = TAS - Headwind component = 115 kt - 10 kt = 105 kt.

2. Safe Endurance = Distance / Groundspeed = 200 NM / 105 kt = 1.905 hr or 114.3 minutes.

3. Total Endurance = Safe Endurance + Final Reserve Fuel = 114.3 min + 30 min = 144.3 minutes or 2 hr 24.3 minutes.

4. Total Fuel Required = Fuel consumption x Total Endurance = 3 kg/min x 144.3 minutes = 432.9 kg ≅ 433 kg.

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