What is the primary function of a trim tab?

The primary function of a trim tab is to reduce the control surface workload. Trim tabs are small adjustable surfaces attached to the primary control surfaces of an aircraft, such as the elevator, aileron, or rudder. When a trim tab is deflected, it creates aerodynamic forces that help maintain the desired flight attitude without the pilot needing to exert continuous pressure on the control yoke or stick.

By establishing a neutral position for the aircraft's controls in a specific flight condition, trim tabs allow pilots to fly hands-off for certain maneuvers or phases of flight without tiring, thereby improving overall pilot efficiency and comfort. This is especially important during long flights or when maintaining heading and altitude.

Trim tabs do not primarily increase overall lift, help control aircraft attitude, or stabilize lateral movement; rather, their main purpose is to assist in managing control forces, allowing the pilot to maintain control with reduced effort. This understanding is crucial for effective flight management and contributes to pilot proficiency.