Anti-servo tab

From FlightSim

An anti-servo tab is a movable surface mounted on the trailing edge of a stabilator which moves in the same direction as the stabilator when the pilot moves the stick fore or aft. This provides some resistance to the movement of the stick, which would otherwise require almost no pressure on the controls, and gives the pilot much needed feedback. It is also generally adjustable by the pilot to provide pitch trim.

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See also the Wikipedia entry anti-servo tab.