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A gust lock is fitted to

  • A.Prevent flutter in flight
  • B.Hold the trim tab at its cruise setting
  • C.Lock the actuator against runaway
  • D.Protect the surfaces from wind on the ground

Answer: D

A gust lock holds the surfaces still on the ground, where wind can slam them against their stops and damage the hinges or the control run. It is removed before flight, and interlocks or checklists exist precisely because taking off with one fitted has caused accidents. Flutter is an in-flight phenomenon addressed by mass balance and stiffness. Trim settings and actuator runaways are handled by other means entirely.

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