Discussion
Which of these is NOT a legitimate use of a weight exchange rate?
Answer: C
Correct answer: Determining the aircraft's certification basis
The certification basis is set by the airworthiness regulations and the aircraft’s category, and no engineering trade study can alter it. The other three are exactly what exchange rates are for: judging a heavier but more efficient engine, trading structure against systems, and deciding whether a drag-reducing fairing pays for the mass it adds.
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