The gauge shows that the reservoir is full.

Data Transmission or Auto Calling, e.g. SELCAL, presents information derived from pulse-coded transmissions.

Communication system include the units and components which furnish a means of communicating from one part of the aircraft to another and between the aircraft and other aircraft or ground stations.

Auto Throttle includes engaging, sensing, computing, amplifying, controlling, actuating and warning devices such as amplifiers, computers, servos, limit switches, clutches, gear boxes, warning lights, etc.

Auto Throttle automatically controls the position of the throttles to properly blend engine power with flap position and aircraft pitch attitude during landing/approach and go around procedures.

Autopilot uses radio beam, vertical gyro, Pitot static and manually induced inputs to the system to automatically control yaw, pitch and roll of the aircraft.

Overhaul of any or all components in this chapter must be accomplished in a qualified shop in accordance with data supplied by the component manufacturer.

Chapter 22 is about those units and components which furnish a means of automatically controlling the flight of the aircraft. Includes those units and components which control direction, heading, attitude, altitude and speed.

Moisture/Air Contaminant Control system is used to control moisture in the air, to control ozone concentrations, to filter radioactive debris from conditioned air, and to treat the air with deodorizers, insecticides, etc., as applicable.

In the pressure control portion of air conditioning system, the pressure, proportional to the flow, is transmitted to an amplifier that converts it to voltage

Chapter 21 may refer to supplier data, furnished with the aircraft, in lieu of the following sections -00 through-70, as applicable.