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As fuel burns off during a flight the centre of gravity

  • A.Always moves aft
  • B.Moves, and the static margin changes accordingly
  • C.Remains exactly where it was
  • D.Always moves forward

Answer: B

Correct answer: Moves, and the static margin changes accordingly

Which way it moves depends on where the tanks sit relative to the centre of gravity. Burning fuel from tanks aft of it draws the centre of gravity forward and increases the margin; burning from tanks ahead of it does the opposite. The neutral point does not move, so every shift of the centre of gravity changes the margin directly, and the loading schedule must keep the whole burn sequence inside the limits, not merely the take-off and landing conditions.

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