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Fuel is burned from the inboard tanks first on many transports because

  • A.Outboard tanks cannot be pumped
  • B.It improves the aircraft's directional stability
  • C.Outboard fuel preserves inertia relief
  • D.Inboard fuel is of a different grade

Answer: C

Correct answer: Outboard fuel preserves inertia relief

Fuel held in the outboard tanks sits beyond most of the wing structure, and its weight acts downwards against the lift acting upwards, so it relieves the bending moment at the root rather than adding to it. Burning the inboard fuel first therefore keeps that relief in place for as long as possible, which is why the outboard tanks are emptied last.

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