Discussion
Assertion (A): An empty feasible region means the requirements must be revisited.
Reason (R): Every line on the diagram represents a customer requirement or a certification rule.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the assertion. Every line on the diagram represents a customer requirement or a certification rule, so none of them is a designer's preference that can be traded away or partially met.
An empty feasible region therefore means the requirements as stated are unachievable under the assumptions made, and the only honest responses are to renegotiate a requirement or to improve an assumption - better high-lift performance, a higher aspect ratio, a more advanced engine. Continuing with a violated constraint would produce an aircraft that either fails to sell or fails to certificate.
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