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Discussion

The scatter factor applied to a demonstrated fatigue life covers

  • A.Corrosion alone
  • B.Material scatter and spectrum differences
  • C.Errors in the static strength calculation
  • D.The cost of the test

Answer: B

A single test article cannot represent the whole fleet, and no spectrum exactly matches how every operator flies. Factors of three or more on life are common, and the demonstrated life must therefore be several times the certified one.

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