What is the function of a balance tab?

• A. Provides additional drag to dampen control.
• B. An auxiliary control mounted on a primary control surface, which automatically moves in the direction opposite the primary control to provide an aerodynamic assist in movement.
• C. Locks the primary control in position.
• D. Records control surface position.

Answer: (B)

Balance tabs are small movable surfaces attached to a primary control surface that deflect automatically in the opposite direction to the pilot’s input. This opposite deflection creates an aerodynamic force that helps move the main surface, lightening the force you must apply at the controls. The result is a lighter, more controllable feel, especially at higher airspeeds or on larger aircraft. Unlike a trim tab, which is set to hold a static deflection, a balance tab moves with the control surface to provide immediate assistance in movement rather than just holding a position.