A plane's control surfaces allow it to roll, pitch, and lift. In the drawing, a red arrow shows the way the control stick is being tilted. Small green arrows show the swing of the respective control surfaces and indicate the direction of the forces acting on the cable. The bent wires show the generic routing of control cables in the aircraft, and connect the controls with the control surfaces. This is meant to be a universal figure. In smaller or older aircraft, the lines represent actual cables that link controls to control surfaces. In more modern aircraft, a computer monitors control movements and comments are electronically sent to control surface actuators. The labeled parts are: A. aileron; B. control stick; C. elevator, D. rudder.