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Refer to figure.
A pilot decides to load fuel only the inner and outer fuel tanks on both wings, for aerodynamic and mass and balance reasons. The middle tank will remain empty. With a fuel density of 0.9, what is the maximum amount of fuel that can be loaded?

  • A

    12 252 kg

  • B

    14 047 kg

  • C

    15 608 kg

  • D

    15 608 USG

Refer to figure.
In the annex given, masses are calculated with a specific gravity of 0.785 kg/l and cannot be used to directly determine the maximum mass that can be loaded. Masses have to be calculated again with a specific gravity of 0.9 kg/l instead.

The total fuel volume in liters for the outer and inner tanks as given in the annex is:

  • Total Fuel Volume (l) = Outer Tank Volume (l) + Inner Tank Volume (l) = (880 l x 2) + (6924 l x 2) = 15 608 l

To calculate the fuel mass, the specific gravity of 0.9 kg/l will be used:

  • Total Fuel Mass (kg) = Total Fuel Volume (l) x Fuel Specific Gravity (kg/l) = 15 608 l x 0.9 kg/l = 14 047 kg

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