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Which of the following is NOT a reason maximum zero fuel weight is limited?

  • A.Payload adds to wing root bending
  • B.Wing fuel relieves that bending
  • C.The wing structure is sized for a given root moment
  • D.The fuel tanks would overflow

Answer: D

Correct answer: The fuel tanks would overflow

Maximum zero fuel weight is a structural limit on wing root bending. Payload in the fuselage adds to that moment while fuel in the wing relieves it, so the worst case is maximum payload with minimum fuel - which is exactly the zero fuel condition. Tank capacity is a separate physical limit and has nothing to do with why the zero fuel weight is capped.

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