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When power assisted controls are used for pitch control:
  • A
    aerodynamic balancing of the control surfaces is meaningless.
  • B
    a part of the aerodynamic forces is still felt on the column.
  • C
    they only function in combination with an elevator trim tab.
  • D
    trimming is superfluous.

For power assisted controls, movement of the control column will move both the flying control and the pilot valve. The force needed to move the surface, although partly provided by the pilot's effort, is supplemented by electrical, hydraulic, or pneumatic means. Part of the aerodynamic forces are still felt on the control column.

Unlike fully powered controls, where there is no machanical linkage between the control column and the surface, for power assisted controls, the control column is still connected to the control surface.

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