What is the primary control feature located on the trailing edge of the horizontal stabilizer?

The primary control feature located on the trailing edge of the horizontal stabilizer is the elevator. Elevators are crucial for controlling the pitch of an aircraft, which determines whether the nose of the aircraft points up or down. When the pilot pushes or pulls on the yoke or control stick, the elevator moves either up or down, causing the aircraft to ascend or descend accordingly.

The positioning of the elevator on the horizontal stabilizer allows it to effectively manipulate the airflow over the tail section, generating the necessary aerodynamic forces to alter the aircraft's attitude in flight. The design and function of the elevator play an essential role in maintaining stability and control during various phases of flight.

In contrast, the rudder, aileron, and stabilator serve different functions. The rudder is used for yaw control and is located on the vertical stabilizer, while ailerons control roll and are positioned on the wings. The stabilator is a type of movable horizontal stabilizer that combines the functions of both the elevator and stabilizer, but it is primarily a different control surface than the traditional elevator design.