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Aircraft flight controls are the means by which a pilot controls the direction and attitude of an aircraft in flight.
Flight control systems are subdivided into what are referred to as primary and secondary flight controls. Primary flight controls are required to safely control and aircraft during flight and consist of ailerons, elevator (or, in some installations, stabilator) and rudder. Secondary flight controls are intended to improve the aircraft performance characteristics or to relieve excessive control loading and consist of high lift devices such as slats and flaps, flight spoilers and trim systems.
Movement of the flight controls