ABSTRACT
The control of an aircraft can be divided into three states: manual, semi-automated, and automated. In manual control, aircraft state parameters such as airspeed, altitude, rate of climb or descent are under the direct manual control of the pilot through the manipulation of primary and secondary controls. Primary controls include the use of yoke (or control stick) to change aircraft pitch and roll, rudders to control aircraft yaw, and throttles to control aircraft thrust. Secondary controls include the use of flaps and related devices to control wing lift properties. They also include elevator and aileron trim controls and braking systems for ground operation.
