Appendix 3. Abbreviations/Acronyms As used in this manual, the following abbreviations/acronyms have the meanings indicated. Abbreviation/ Acronym Meaning Abbreviation/ Acronym AAWU . AAS . AAM AC ACAR . Alaskan Aviation Weather Unit Airport Advisory Service Advanced Air Mobility Advisory Circular Aircraft Communications Addressing and Reporting System ASRS ASSC ATC . Aviation Safety Reporting System Airport Surface Surveillance Capability Air Traffic Control ATCRBS ATCSCC Air Traffic Control Radar Beacon System Air Traffic Control System Command Center ADCUS ADDS ADF . ADIZ ADS-B . Advise Customs Aviation Digital Data Service Automatic Direction Finder Air Defense Identification Zone Automatic Dependent Surveillance-Broadcast AFB . AFCS AFIS . AFM . AGL . AHRS AIM . AIRMET . AIS ALD . ALDARS . Air Force Base Automatic Flight Control System Automatic Flight Information Service Aircraft Flight Manual Above Ground Level Attitude Heading Reference System Aeronautical Information Manual Airmen"s Meteorological Information Aeronautical Information Services Available Landing Distance Automated Lightning Detection and Reporting System ATCT ATD . ATIS . ATO . ATT . AWC . AWOS . AWTT . AWW Airport Traffic Control Tower Along-Track Distance Automatic Terminal Information Service Air Traffic Organization Attitude Retention System Aviation Weather Center Automated Weather Observing System Aviation Weather Technology Transfer Severe Weather Forecast Alert BAASS . Bigelow Aerospace Advanced Space Studies BBS . BC BECMG BVLOS Bulletin Board System Back Course Becoming group Beyond Visual Line of Sight C/A CARTS . ALS . AMSL . ANP . AOCC . AP APV . Approach Light Systems Above Mean Sea Level Actual Navigation Performance Airline Operations Control Center Autopilot System Approach with Vertical Guidance AR ARENA ARFF IC Authorization Required Areas Noted for Attention Aircraft Rescue and Fire Fighting Incident Commander ARINC . ARO . ARSA ARSR ARTCC . ARTS ASDE-X . Aeronautical Radio Incorporated Airport Reservations Office Airport Radar Service Area Air Route Surveillance Radar Air Route Traffic Control Center Automated Radar Terminal System Airport Surface Detection Equipment - Model X Coarse Acquisition Common Automated Radar Terminal System (ARTS) (to include ARTS IIIE and ARTS IIE) Clear Air Turbulence Community-Based Organization Controller Display Course Deviation Indicator Coded Departure Route Combined Center/RAPCON Controlled Firing Area Controlled Flight into Terrain Code of Federal Regulations Certificate of Waiver or Authorization Controller Pilot Data Link Communications ASOS ASR . Automated Surface Observing System Airport Surveillance Radar Abbreviations/Acronyms CAT . CBO . CD CDI CDR . CERAP . CFA . CFIT . CFR . COA . CPDLC . Meaning CTAF CVFP CVRS CWA . CWSU . Common Traffic Advisory Frequency Charted Visual Flight Procedure Computerized Voice Reservation System Center Weather Advisory Center Weather Service Unit DA Decision Altitude Appendix 3-1