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A fail-safe structure is one designed so that

  • A.The structure is replaced at a fixed life
  • B.An alternative load path survives a failure
  • C.No member can ever fail
  • D.Every member is inspected before each flight

Answer: B

Fail-safe design accepts that a member may crack and provides a second path to carry the load until the damage is found. Multiple load paths, crack stoppers and tear straps are the usual means, and the philosophy replaced the earlier safe-life approach for most transport structures.

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