What is the function of flight control surfaces?

• A. To power the engines.
• B. To control pitch, roll, and yaw, shaping the aircraft's flight path.
• C. To deploy landing gear.
• D. To reduce fuel consumption.

Answer: (B)

Flight control surfaces are the movable parts that generate the aerodynamic forces needed to rotate the airplane about its three axes and shape its path through the air. When you move the control stick and pedals, the elevator on the horizontal tail tilts the nose up or down, controlling pitch. The ailerons on the wings tilt opposite ways to roll the aircraft, lifting one wing and lowering the other. The rudder on the vertical tail deflects left or right to yaw the nose. Together, these deflections create pitching, rolling, and yawing motions that steer the aircraft and determine its flight path, including climbs, descents, and turns. They don’t power the engines, deploy landing gear, or directly reduce fuel consumption; their primary role is maneuvering the aircraft by altering its attitude and trajectory.