Roll is controlled by which of the following?

Roll is primarily controlled by the ailerons, which are hinged flight control surfaces located on the outer portions of the wings of an aircraft. When a pilot wants to initiate a roll, the ailerons move in opposite directions: one aileron goes up while the other goes down. This creates a difference in lift between the two wings, causing the aircraft to roll towards the wing with the lowered aileron.

Understanding the function of the ailerons is essential for managing the aircraft's orientation during flight, especially during maneuvers that require banking or turning. This distinguishes the ailerons from other control surfaces; for instance, while the rudder controls yaw (the left or right movement of the aircraft’s nose), and the elevators manage pitch (the up or down movement of the nose), it is the ailerons that specifically facilitate roll. Flaps, on the other hand, are primarily used to increase lift and drag during takeoff and landing, not for controlling roll.