Which flight control electromechanical trim system utilizes movement of the actual primary flight control surface?

The flight control electromechanical trim system that uses the actual movement of the primary flight control surface is the ailerons. This system allows for the adjustment of the ailerons in flight to counteract any roll tendencies and maintain level flight without the need for constant pilot input on the control yoke.

In this context, trim systems are designed to relieve the pilot of the need to exert continuous pressure on the control surfaces. Ailerons, which are responsible for controlling the roll of the aircraft, can be adjusted to reflect the desired flight attitude and reduce the workload on the pilot.

While flaps, rudder, and elevators are also primary control surfaces, they operate differently concerning trim systems. Flaps are primarily used for increasing lift during takeoff and landing, and they do not serve as a trim function for roll control. The rudder is used for yaw control and lateral stability, but trimming the rudder typically doesn’t involve the same mechanism as aileron trim. Elevators control pitch, yet again, they have distinct trimming processes compared to ailerons. Thus, the ailerons are unique in this regard as they directly adjust their position to assist in maintaining it, embodying the concept of a trim system that utilizes the