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Which statement about limit and ultimate load is INCORRECT?

  • A.The structure may deform permanently at limit load
  • B.Ultimate load is 1.5 times limit load
  • C.Ultimate load must be held for three seconds
  • D.Limit load is the largest load expected in service

Answer: A

No detrimental permanent deformation is permitted at limit load, since the aircraft must continue in service afterwards. It is at ultimate load that permanent set is accepted, provided the structure does not actually fail.

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