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Given the following information, calculate the Zero Fuel Mass.

Take-Off Mass: 9000 kg
Total fuel on board: 1900 kg
Reserve fuel: 300 kg
Unusable fuel: 20 kg
Traffic load: 1000 kg

  • A
    7120 kg
  • B
    6780 kg
  • C
    6100 kg
  • D
    7100 kg

Be careful of the trap:
Total fuel is literally that - including the usable & unusable fuel. We know that unusable fuel is included in ZFM so be sure to include it…

Useable fuel = Total fuel on board — Unusable fuel
Useable fuel = 1900 — 20 = 1880 kg

Zero fuel mass = Takeoff mass — Useable fuel
Zero fuel mass = 9000 — 1880 = 7120 kg

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