Discussion
Statement I: An empty feasible region means the design point should be placed where the fewest constraints are violated.
Statement II: Every constraint on the diagram represents a requirement or a certification rule.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect. An empty feasible region cannot be resolved by choosing where to violate the fewest constraints, because a violated requirement is a requirement not met and a violated certification rule is an aircraft that cannot be certificated.
Statement II is correct and is exactly why: every line on the diagram represents either a customer requirement or a rule, and neither is negotiable at the designer's discretion. The proper response is to go back to the inputs - relax a requirement with the customer's agreement, or improve an assumption about aerodynamics, high-lift performance or engine technology.
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