What role does a servo tab play in flight control surfaces?

A servo tab plays a crucial role in assisting the pilot by reducing the control forces needed to manipulate the primary flight controls. When a pilot adjusts the flight control surfaces, the servo tab moves in the opposite direction, creating an aerodynamic force that helps to move the primary control surface more easily. This results in a lighter feel for the pilot, making it less physically demanding to operate the aircraft, particularly during maneuvers that require more significant deflection of the control surfaces.

By effectively decreasing the amount of force needed, the servo tab enhances the pilot's control of the aircraft, particularly in larger or heavier aircraft where control forces can be significant. This mechanical advantage is especially beneficial during critical phases of flight like takeoff, landing, and maneuvering.

The other options address functionalities that servo tabs do not provide. For example, enhancing aerodynamic stability involves different mechanisms and concepts in aerodynamics, while measuring flight altitude is the responsibility of altimeters. Increasing aircraft speed pertains to thrust and aerodynamic design rather than control surface manipulation. Thus, the primary function of the servo tab centers on enabling easier control by reducing the forces the pilot must exert.