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Assertion (A): Transports often lock their outboard ailerons at high speed.

Reason (R): A torsionally flexible outer wing can suffer aileron reversal.

Select the correct answer from the options below.

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

Answer: B

Both are true and the second explains the first. The outboard aileron has the longest moment arm but acts on the most flexible part of the wing, so it reverses first. Rolling on spoilers and inboard ailerons at speed avoids the problem entirely.

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