What is the function of an aileron on an aircraft?

• A. To control the pitch of the aircraft
• B. To control the yaw of the aircraft
• C. To control the roll of the aircraft along its longitudinal axis
• D. To provide thrust to the aircraft

Answer: (C)

The function of an aileron is to control the roll of the aircraft along its longitudinal axis. Ailerons are located on the outer wings of an aircraft and work by moving in opposite directions; when one aileron goes up, the corresponding aileron on the opposite wing goes down. This differential movement generates a difference in lift between the two wings, causing the aircraft to roll to one side or the other.

This capability is crucial for turning the airplane, as it allows the pilot to bank the aircraft, facilitating more efficient and controlled maneuvers. Understanding the role of ailerons is fundamental to grasping how aircraft achieve and control movement in three-dimensional space, specifically regarding lateral stability and coordination during flight.