What controls the primary pitch trim?

The primary pitch trim is controlled by the hat switch. This control is typically located on the control yoke or joystick, allowing the pilot to make quick and intuitive adjustments to the aircraft’s pitch attitude during flight. The hat switch enables the pilot to trim the aircraft without removing their hands from the control surface, facilitating smoother operation and reducing fatigue during longer flights.

The hat switch functions by sending signals to the trim system, which adjusts the position of the trim tabs on the control surfaces. This helps in maintaining the desired flight attitude with minimal continuous force applied by the pilot on the yoke or stick.

While other systems, such as the autopilot, can manage pitch and trim adjustments automatically, the direct control for primary pitch trim in a manual operating context is the hat switch. The manual lever might refer to a different system that is less commonly used in modern aircraft, while an electronic module may encompass broader aircraft control functions but does not specifically denote the direct control mechanism for pitch trim.