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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 as well as flight spoilers and trim systems.
Movement of any of the primary flight controls causes the aircraft to rotate around the axis of rotation associated with the control surface. The ailerons control motion around the longitudinal axis, referred to as roll, the elevator controls rotation around the lateral axis, referred to as pitch and the rudder controls movement around the vertical axis, referred to as yaw.
The most basic flight control systems are mechanical and date back to the earliest aircraft types but are still in use in the majority of light, general aviation, aircraft. In this design, a collection of mechanical components such as cables, pulleys, rods and chains transmit the movement of the flight deck controls to the appropriate control surface. In larger and faster aircraft, the aerodynamic forces become too great for the pilot to overcome without assistance so hydraulic systems may be incorporated. In modern aircraft, the quest for reduced weight and the associated fuel savings has led designers to replace the mechanical components with computers and fiber optics in control systems which are referred to as Fly-By-Wire.