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Refer to figure.
Given the following information, what is the Zero Fuel Mass?

Take-Off Mass: 141 000 kg
Total Fuel at take-off: 67 000 kg including 15 000 kg of Reserve Fuel and 900 kg of Unusable Fuel
Traffic load: 12 900 kg

  • A

    89 900 kg

  • B

    74 000 kg

  • C

    74 900 kg

  • D

    61 100 kg

Refer to figure.
This question, like many others, tests knowledge of both various mass definitions and also their relationship to each other. An ability to sketch and understand a diagram, as per the figure, is considered an essential skill in this subject.

CAP 758 defines the zero fuel mass (ZFM) as DOM plus traffic load but excluding fuel.

From the information given:

  • Take-Off Mass: 141 000 kg
  • Total Fuel at take-off: 67 000 kg including 15 000 kg of Reserve Fuel and 900 kg of Unusable Fuel
  • Traffic load: 12 900 kg

We need to work backwards:

Take-Off Mass (141 000 kg) - Take-Off Fuel (67 000 kg - 900 kg unusable fuel = 66 100 kg) = ZFM 74 900 kg

Note: The trap in this question is that the unusable fuel is already included in the Basic Empty Mass.

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