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B-basis allowables may be used where

  • A.No test data exist
  • B.The material is a composite only
  • C.The structure has redundant load paths
  • D.The member is single load path and critical

Answer: C

Correct answer: The structure has redundant load paths

B-basis allowables are set at 90 per cent survival with 95 per cent confidence, against A-basis at 99 per cent survival. The lower figure is permitted where load paths are redundant, because failure of one member does not fail the structure - the load redistributes. A single load path member, whose failure is the structure’s failure, must be sized on A-basis.

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