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A design that closes in the sizing loop means

  • A.The aircraft has flown
  • B.The drawings are complete
  • C.The weight estimate converges
  • D.The design has been certified

Answer: C

Successive iterations of the weight and fuel estimate cease to change materially, so the design is self-consistent. A design that fails to close, with weight diverging each iteration, is signalling that the requirements may not be simultaneously achievable.

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