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The primary structure of an aircraft is defined as that whose failure would

  • A.Increase drag noticeably
  • B.Affect passenger comfort only
  • C.Require replacement at the next overhaul
  • D.Endanger the aircraft

Answer: D

Primary structure carries flight, ground or pressurisation loads whose loss would put the aircraft at risk, and it attracts the full weight of certification, inspection and repair control. Secondary structure, such as fairings, is treated far less stringently.

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