Definition
The movable, hinged sections of an airplane's wings and tail used by the pilot to control the aircraft's attitude and direction of flight. The primary control surfaces are the ailerons (roll), elevator (pitch), and rudder (yaw). Secondary control surfaces include flaps, trim tabs, spoilers, and slats, which assist or modify the effects of the primary surfaces.
Plain English
The moving panels on the wings and tail that the pilot uses to make the airplane turn, climb, descend, or hold steady. When the pilot moves the controls in the cockpit, these panels move and change how the air flows around the airplane.
Context Anchor
Seen in basic airplane control, preflight inspection, and flight maneuver discussions.
Derivation
From Latin 'controllare' (to check or regulate) and 'superficies' (the outer face of something). Together, the phrase points to the outer panels used to regulate how the airplane flies.
Why Pilots Care
Control surfaces are how the pilot actually flies the airplane. During preflight, each one must be checked for free movement, correct direction of travel, and security. A jammed, damaged, or disconnected control surface can make the airplane unflyable.
Grounding Statement
When the pilot moves the flight controls, the control surfaces move and the airplane responds.
Intuition Check
Do not read this as any surface that has something to do with control. In aviation, control surfaces are the movable airplane parts that directly change how the airplane moves through the air.
Example Sentence 1
During the walkaround, the pilot moved each control surface by hand to confirm it was free, undamaged, and responded in the correct direction.
Example Sentence 2
During the preflight inspection the pilot verified that all control surfaces moved smoothly and without binding.