Which of the following is NOT a basic component of a flight control system?

The landing gear is not considered a basic component of a flight control system. Instead, it is classified as an essential part of the aircraft's structure and functionality, specifically related to its operation on the ground during takeoff and landing. The primary role of the landing gear is to support the aircraft’s weight when it is on the ground and to facilitate safe landings and takeoffs.

In contrast, rudders, ailerons, and elevators are all integral components of the flight control system, which is responsible for maneuvering the aircraft in the air. The rudder controls the aircraft's yaw, enabling it to turn left or right. Ailerons are used for roll control, allowing the aircraft to tilt sideways in flight, while elevators control the pitch, affecting the aircraft's ascent and descent. These three components directly influence an aircraft's flight path and stability, thereby making them fundamental to the understanding of flight dynamics.