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How much taxi fuel must be consumed before take-off to reduce the aircraft mass to the maximum take-off mass?

Maximum ramp mass (MRM): 1150 kg
Actual ramp mass: 1148 kg
Maximum take-off mass (MTOM): 1145 kg

  • A

    3 L

  • B

    4 L

  • C

    2 L

  • D

    5 L

The taxi fuel that must be burnt before take-off to reduce the aircraft mass to the maximum take-off mass is determined with the following manner:

1. Calculate the Excess Mass:

  • The difference between the Actual Ramp Mass and the MTOM is: 1148 kg - 1145 kg = 3 kg.
  • Thus, 3 kg must be burned off to get from the Actual Ramp Mass to the MTOM.

2. Convert Fuel Mass (kg) to Fuel Volume (lt):

  • For all questions, assume that the specific gravity of the aviation gas is 0.72 kg/lt.
  • So, since the volume of 0.72 kg aviation gas is 1 lt, then the volume of 3 kg aviation gas is 4 lt (3 / 0.72).

NOTE:

A relationship exists between litres and kilograms: one litre of water weighs one kilogram. To convert from volume to mass or mass to volume, you need the Specific Gravity of the fuel. The Specific Gravity (SG) shows the relationship between litres and kilograms.

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