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An engineer proposes bolting a carbon composite fitting directly to an aluminium spar. The proposal is

  • A.Sound provided titanium fasteners are used
  • B.Unsound because carbon will corrode
  • C.Unsound; the aluminium will corrode
  • D.Sound

Answer: C

Carbon is conductive and noble relative to aluminium, so with any moisture present the aluminium corrodes preferentially. A glass fibre interleaf or sealant is required, and titanium fasteners alone address only the fastener interface.

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