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Torsional stiffness of a wing box falls sharply if a large cut-out is made in the skin because

  • A.It interrupts the circulating shear flow
  • B.The cut-out reduces the wing's weight
  • C.The cut-out changes the aerofoil section
  • D.The cut-out increases the enclosed area

Answer: A

Any opening large enough to break the continuity of the shear flow locally converts that bay towards open-section behaviour. Undercarriage bays and access panels are therefore ringed with heavy edge members and, where possible, closed by structural doors.

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