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Fuel burn during a flight moves the centre of gravity because

  • A.Passengers move about the cabin
  • B.Tanks are offset and empty in sequence
  • C.Fuel becomes lighter as it warms
  • D.The aircraft's total weight changes

Answer: B

Emptying an outboard tank before an inboard one shifts the balance, and long-range aircraft sometimes use a tail tank deliberately to trim the aircraft aft in cruise and reduce trim drag. The schedule is designed with the envelope in mind.

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