other control surfaces are locked out or remain stationary.  Figure 1-56  illustrates the location of the typical flight control  surfaces found on a transport category aircraft. The elevator is the primary flight control surface that moves  the aircraft around the horizontal or lateral axis. This causes the  nose of the aircraft to pitch up or down. The elevator is hinged  to the trailing edge of the horizontal stabilizer and typically  spans most or all of its width. It is controlled in the cockpit  by pushing or pulling the control stick or yoke forward or aft. Light aircraft use a system of control cables and pulleys or  push-pull tubes to transfer cockpit inputs to the movement  of the elevator. High-performance and large aircraft  typically employ more complex systems. Hydraulic power  is commonly used to move the elevator on these aircraft. On  aircraft equipped with fly-by-wire controls, a combination  of electrical and hydraulic power is used. the rudder to the right which moves the nose of the aircraft  to the right. The left pedal is rigged to simultaneously move  aft. When the left pedal is pushed forward, the nose of the  aircraft moves to the left. As with the other primary flight controls, the transfer of the  movement of the cockpit controls to the rudder varies with  the complexity of the aircraft. Many aircraft incorporate the  directional movement of the nose or tail wheel into the rudder  control system for ground operation. This allows the operator  to steer the aircraft with the rudder pedals during taxi when  the airspeed is not high enough for the control surfaces to be  effective. Some large aircraft have a split rudder arrangement.  This is actually two rudders, one above the other. At low  speeds, both rudders deflect in the same direction when the  pedals are pushed. At higher speeds, one of the rudders  becomes inoperative as the deflection of a single rudder is  aerodynamically sufficient to maneuver the aircraft. The rudder is the primary control surface that causes an  aircraft to yaw or move about the vertical axis. This provides  directional control and thus points the nose of the aircraft  in the direction desired. Most aircraft have a single rudder  hinged to the trailing edge of the vertical stabilizer. It is  controlled by a pair of foot-operated rudder pedals in the  cockpit. When the right pedal is pushed forward, it deflects  The ailerons, elevators, and rudder are considered  conventional primary control surfaces. However, some  aircraft are designed with a control surface that may serve a  dual purpose. For example, elevons perform the combined  functions of the ailerons and the elevator.  [Figure 1-57] A movable horizontal tail section, called a stabilator, is a  control surface that combines the action of both the horizontal  Dual Purpose Flight Control Surfaces Rudder  Elevator Figure 1-56.  Typical flight control surfaces on a transport category aircraft. Inboard aileron Outboard aileron Flight spoilers 1-27