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A repair adds an external doubler over impact damage on a wing skin. Compared with a scarf repair this is

  • A.Unacceptable in all circumstances
  • B.Simpler, but eccentric and less efficient
  • C.More efficient in every respect
  • D.Identical in performance

Answer: B

An external patch is quicker and needs less process control, but the load path steps out and back, producing bending and a concentration at the patch edge. Scarfing tapers the transition through the thickness and is used where structural efficiency matters.

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