What is the purpose of an anti-servo tab?

The purpose of an anti-servo tab is to prevent a control surface from moving to a full-deflection position. This is achieved by providing a counteracting force that enhances the stability and control of the aircraft. When a pilot inputs control movements, the anti-servo tab increases aerodynamic resistance, thereby making it more difficult to reach extreme deflections. This serves to improve pilot control by providing a more linear response to control inputs and reducing the likelihood of overcontrol, which can lead to adverse situations during flight.

In contrast to other components typically found on control surfaces, the anti-servo tab specifically functions to promote gradual and manageable control responses, thereby improving overall flight safety and handling characteristics. While some tabs might serve to enhance the effectiveness of a control surface or reduce control forces, the primary role of an anti-servo tab remains its function in limiting full deflection and promoting control precision.