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Which best describes a fully powered irreversible control?

  • A.The surface is driven by a tab
  • B.The actuator carries the whole air load
  • C.The pilot and the actuator share the load equally
  • D.The actuator assists only above a threshold speed

Answer: B

In an irreversible system the actuator carries the entire hinge moment and none of it reaches the pilot, which is why an artificial feel system must be provided. Shared loading describes a power-assisted or boosted control, which is a different arrangement with its own feel characteristics. Threshold-speed assistance is not how these systems work. And tab-driven surfaces are servo tab systems, the pre-hydraulic answer to the same problem.

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