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A control surface is described as irreversible. This means

  • A.Air loads on the surface cannot move the pilot's controls
  • B.The surface cannot be trimmed
  • C.The surface cannot return to neutral once the actuator has been commanded
  • D.The system has no artificial feel

Answer: A

An irreversible system is one in which the actuator holds the surface against the air load and no part of that load is fed back to the pilot's controls, which is why artificial feel becomes necessary. Trimming remains perfectly possible, through the feel unit's datum or a trim actuator. The surface returns to commanded position normally. And the absence of feel is the consequence rather than the definition.

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