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A cut-out such as a passenger door in a pressurised fuselage requires local reinforcement because

  • A.The interrupted load must pass around it
  • B.The door itself carries no load at any time
  • C.The pressure is higher near a door
  • D.The skin is thinner elsewhere

Answer: A

Removing skin interrupts both the hoop and the shear paths, so the load must divert round the opening and concentrates sharply at its corners. Heavy edge members, doublers and generously radiused corners are the standard treatment, and square corners have caused fatal accidents.

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