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Which statement about a pressurised fuselage is INCORRECT?

  • A.The longitudinal stress is twice the hoop stress
  • B.The hoop stress is twice the longitudinal stress
  • C.The loading is applied once per flight cycle
  • D.Cracks tend to run along the fuselage rather than around it

Answer: A

The ratio is the other way round: the hoop stress is the larger, at twice the longitudinal value. That is exactly why cracks propagate lengthwise, driven by the hoop stress acting across them, which the remaining options describe correctly.

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