What is the function of the antiservo tab on the stabilator?

• A. An adjustable tab attached to the trailing edge of a stabilator that moves in the same direction as the primary control.
• B. A fixed wingtip device that reduces drag.
• C. A separate control surface used for yaw control.
• D. A ventral fin used to enhance stability.

Answer: (A)

The antiservo tab on a stabilator is a small, adjustable tab on the trailing edge that moves in the same direction as the stabilator. Its purpose is to add stability and reduce how sensitive the pitch is to pilot input. As the stabilator deflects, the antiservo tab deflects the same way, creating an aerodynamic force that resists further movement. This makes the aircraft steadier in pitch and requires more effort from the pilot to move the control, which helps prevent overreacting to a command. The tab is adjustable to tune how much stability and feel you get. This is different from a fixed wingtip device that reduces drag, a separate yaw control surface, or a ventral fin.