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A fatigue test of a full-scale airframe is normally run for

  • A.Several times the intended service life
  • B.Exactly the intended service life
  • C.A few hundred cycles only
  • D.The same duration as the static test

Answer: A

A scatter factor of two or more on demonstrated life covers material variability and the difference between the test spectrum and real usage. The test also reveals where cracks appear first, which drives the inspection programme.

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