Aviation Terms->Control Surface
Any moveable surface on an aircraft which controls its motion about one of the three principal axes. Ailerons, elevators, and the rudder are examples of control surfaces. In addition, other type of roll control surfaces are roll spoilers that dump lift on one wing or another (as opposed to ailerons), spoilerons (combined spoiler and aileron), and flaperon (combined flap and aileron). Another combined controls is the ruddervator (combined elevator and rudder). Other subsidiary controls are pitch, roll, and rudder trim tabs and the stabilator (the whole horizontal stabilizer moves to trim the pitch axis).