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Which statement about the factor of safety of 1.5 is TRUE?

  • A.Small, because loads are known precisely
  • B.It is large by civil engineering standards
  • C.It applies between ultimate load and failure
  • D.It varies with aircraft category

Answer: A

Civil engineering commonly uses factors of three or more, but aircraft loads are known unusually well and every kilogram of structure costs payload for the aircraft's whole life. The 1.5 factor sits between limit and ultimate and applies across the categories.

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