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Assertion (A): Commonality with an existing family compromises the aerodynamic optimum.

Reason (R): The new aircraft inherits choices made for a different design problem.

Select the correct answer from the options below.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both statements are true and the second is the reason for the first. The compromise is accepted because shared type ratings, spares and development costs are worth more to operator and manufacturer than the last few per cent of efficiency.

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