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Which of the following would NOT be classed as primary structure?

  • A.A main undercarriage attachment fitting
  • B.A wing-to-fuselage fairing
  • C.The rear pressure bulkhead
  • D.A wing spar cap

Answer: B

The fairing carries no flight, ground or pressure load whose loss would hazard the aircraft, so it is secondary structure. The other three carry loads whose failure would be critical and attract the full weight of certification and inspection control.

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