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Maximum zero fuel weight is a structural limit because

  • A.The tanks would overflow
  • B.The centre of gravity would move too far aft
  • C.Fuel in the wings relieves the root bending moment
  • D.Fuel is heavier than payload

Answer: C

Payload sits in the fuselage and adds to the bending the wing root must carry, while wing fuel opposes it. An aircraft can therefore be within its take-off weight limit and still overload the wing if too much of that weight is payload.

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