ABSTRACT
Control systems are designed in many forms and are utilized throughout a range of aircraft applications. A specific input, such as moving a lever or joystick, causes a specific output, such as feeding current to an electric motor that in turn operates a hydraulic actuator that moves, e.g. the elevator of the aircraft. At the same time, the position of the elevator is detected and fed back to the pitch attitude controller, so that small adjustments can continually be made to maintain the desired attitude and altitude.
