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ATC CLEARS - Used to prefix an Air Traffic Control clearance when it is relayed to an aircraft by other than an air traffic controller.
ATCRBS - (See Radar)
ATC REQUESTS - Used to prefix an Air Traffic Control request when it is relayed to an aircraft by other than an air traffic controller.
AUTOLAND APPROACH - A precision instrument approach to touchdown and, in some cases, through the landing rollout. An autoland approach is performed by the aircraft autopilot which is receiving position information and/or steering commands from onboard navigation equipment (See Coupled Approach).
NOTE: Autoland and coupled approaches are flown in VFR and IFR. It is common for carriers to require their crews to fly coupled approaches and autoland approaches (if certified) when the weather conditions are less than approximately 4,000 Runway Visual Range.
AUTOMATED AREA INFORMATION RESPONDERS/RAIZ (NGA) - An automated radio communication system used by a Special Use Airspace (SUAS) Controlling Authority to transmit information to users on the absence of activities in a specific SUAS and/or any additional instructions. The system provides users with conditions for SUAS penetration when the controlling authority is not operating.
AUTOMATED INFORMATION TRANSFER (AIT) - A precoordinated process, specifically defined in facility directives, during which a transfer of altitude control and/or radar identification is accomplished without verbal coordination between controllers using information communicated in a full data block.
AUTOMATED RADAR TERMINAL SYSTEMS/ARTS - The generic term for the ultimate in functional capability afforded by several automation systems. Each differs in functional capabilities and equipment. ARTS plus a suffix Roman numeral denotes a specific system. A following letter indicates a major modification to that system. In general, an ARTS displays for the terminal controller aircraft identification, flight plan data, other flight associated information, e.g., altitude and speed, and aircraft position symbols in conjunction with his radar presentation. Normal radar co-exists with the alpha numeric display. In addition to enhancing visualization of the air traffic situation, ARTS facilitate intra/interfac transfer and coordination of flight information. These capabilities are enabled by specially designed computers and subsystems tailored to the radar and communications equipment and operational requirements of each automated facility. Modular design permits adoption of improvements in computer software and electronic technologies as they become available while retaining the characteristics unique to each system.
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ARTS II - A programmable nontracking computer aided display subsystem capable of modular expansion. ARTS II systems provide a level of automated Air Traffic Control capability at terminals having low to medium activity. Flight identification and altitude may be associated with the display of secondary radar targets. The system has the capability of communicating with Air Route Traffic Control Center's and other ARTS II, IIA, III, and IIIA facilities.

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ARTS IIA -A programmable radar-tracking computer subsystem capable of modular expansion. The ARTS IIA detects, tracks, and predicts secondary radar targets. The targets are displayed by the means of computer-generated symbols, ground speed and flight plan data. Although it does not track primary radar targets, they are displayed coincident with the secondary radar as well as the symbols and alpha numerics. The system has the capability of communicating with Air Route Traffic Control Centers and other ARTS II, IIA, III, and IIIA facilities.

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ARTS III - The Beacon Tracking Level (BTL) of the modular programmable automated radar terminal system in use at medium to high activity terminals. ARTS III detects, tracks and predicts secondary radar derived aircraft targets. These are displayed by means of computer generated symbols and alpha numeric characters depicting flight identification, aircraft altitude, ground speed and flight plan data. Although it does not track primary targets, they are displayed coincident with the secondary radar as well as the symbols and alpha numerics. The system has the capability of communicating with Air Route Traffic Control Centers and other ARTS III facilities.
　
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