What is the primary control surface for aircraft roll?

The primary control surface responsible for aircraft roll is the ailerons. Ailerons are located on the outer sections of the wings and operate in opposition to each other; when one aileron moves up, the other moves down. This differential movement creates a difference in lift between the two wings, allowing the aircraft to tilt or roll toward the side with the descending aileron.

The other control surfaces, while essential for overall flight control, serve different purposes. Elevators are primarily used for controlling pitch, which determines the nose-up or nose-down attitude of the aircraft. Rudders are used for controlling yaw, which affects the left or right direction the aircraft is pointing. Flaps are supplementary devices used mainly during takeoff and landing to increase lift and drag.

Understanding the function of ailerons in roll control is crucial for effective aircraft maneuvering and performance during various phases of flight.