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A requirement is written as the aircraft shall have adequate range. This requirement is

  • A.Verifiable once the aircraft is built
  • B.Acceptable if the customer agrees
  • C.Not verifiable; adequate is undefined
  • D.Well written and complete

Answer: C

Correct answer: Not verifiable; adequate is undefined

A requirement must be capable of being closed by a test, an analysis, an inspection or a demonstration, and that means it needs a number, a condition and a tolerance - for instance, 6000 km with 20 t of payload in ISA conditions. “Adequate” leaves the judgement open, so no one can say whether the aircraft complies, and the disagreement surfaces at the worst possible moment. Customer agreement does not repair the defect; it merely postpones it.

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