What is interconnected with the elevator trim tab actuator to automatically input pitch trim?

The elevator trim tab actuator is interlinked with the speed brake, allowing for automatic input of pitch trim when the speed brake is deployed. This system enhances control during variations in speed, particularly when drag from the speed brake affects the aircraft's attitude. When the speed brake is extended, it alters the aerodynamic forces acting on the aircraft, potentially creating a nose-up or nose-down attitude. To counteract this undesired pitch attitude, the elevator trim system adjusts automatically to help maintain level flight without requiring continuous pilot input.

The other options do not perform this function with the elevator trim system. The rudder and aileron relate more to directional control and roll stability, while the flaps primarily modify lift and drag characteristics during specific phases of flight, without direct engagement in pitch trim adjustments related to the speed brake.