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Roll control at high angle of attack deteriorates because

  • A.The wing sweep effectively increases
  • B.The rudder becomes ineffective
  • C.The down going aileron may stall its section of the wing
  • D.The ailerons lose their hinge moment

Answer: C

Lowering an aileron raises the local incidence on a wing already near the stall, so the section may stall rather than gaining lift. The resulting roll reversal near the stall is one reason spoilers and rudder are preferred there.

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