What is the primary function of trim tabs on an aircraft?

The primary function of trim tabs on an aircraft is to allow for hands-off flight steering. Trim tabs are small adjustable surfaces located on the trailing edges of flight control surfaces, such as ailerons, elevators, or rudders. Their main purpose is to help maintain the desired flight attitude without the pilot needing to exert constant pressure on the controls.

When a pilot adjusts the trim tab, it alters the aerodynamic characteristics of the control surface, creating a force that balances the aircraft’s control inputs. This allows the aircraft to fly straight and level, climb, or descend without requiring continuous effort from the pilot, thereby enhancing comfort and efficiency during flight.

The other options, while related to aircraft operation, do not pertain directly to the primary function of trim tabs. They do not assist in takeoff speed, directly affect stall speed, or change the aircraft's weight distribution. Trim tabs simplify the pilot's workload by providing stability and control during cruise and other phases of flight.