What control surface manages roll movement and lateral stability?

The control surface that manages roll movement and lateral stability is the aileron. Ailerons are located on the outer sections of the wings and work by moving in opposite directions to create differential lift about the wings. When one aileron deflects upward while the other deflects downward, the wing with the downward-deflected aileron generates more lift, causing that wing to rise and the aircraft to roll towards the opposite side. This action helps maintain lateral stability and control during flight, essential for maneuvering and keeping the aircraft balanced.

The other surfaces mentioned serve different functions. The rudder primarily controls yaw, affecting the aircraft's direction left or right and is mainly used in conjunction with the ailerons for coordinated turns. The elevator is responsible for pitch control, managing the aircraft's climb and descent by controlling the angle of attack. Flaps are used to increase lift at lower speeds but do not directly influence roll movement or lateral stability. Thus, the aileron is the critical control surface for managing roll and maintaining stability during lateral movements.