Discussion
If no point satisfies all constraints, the correct response is to
Answer: A
Correct answer: Revisit the requirements or the technology assumptions
An empty feasible region means no aircraft satisfying the stated assumptions can meet all the requirements at once. The honest response is to go back to the inputs: relax a performance requirement, improve an assumption about aerodynamic efficiency, high-lift performance or engine technology, or accept a different configuration.
Choosing a point that violates the fewest constraints is not available, because every line on the diagram represents a customer requirement or a certification rule and neither is optional. Increasing the design weight generally makes matters worse, and ignoring the landing constraint would produce an uncertifiable aircraft.
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