Pilot/Controller Glossary

PURPOSE

    1. This Glossary was compiled to promote a common understanding of the terms used in the Air Traffic Control system. It includes those terms which are intended for pilot/controller communications. Those terms most frequently used in pilot/controller communications are printed in bold italics. The definitions are primarily defined in an operational sense applicable to both users and operators of the National Airspace System. Use of the Glossary will preclude any misunderstandings concerning the system's design, function, and purpose.
    2. Because of the international nature of flying, terms used in the Lexicon, published by the International Civil Aviation Organization (ICAO), are included when they differ from FAA definitions. These terms are followed by “[ICAO].” For the reader's convenience, there are also cross references to related terms in other parts of the Glossary and to other documents, such as the Code of Federal Regulations (CFR) and the Aeronautical Information Manual (AIM).
    3. Terms used in this glossary that apply to flight service station (FSS) roles are included when they differ from air traffic control functions. These terms are followed by “[FSS].”
    4. This Glossary will be revised, as necessary, to maintain a common understanding of the system.

    EXPLANATION OF CHANGES

    1. Terms Added:
      CHART SUPPLEMENT
      CHART SUPPLEMENT ALASKA
      CHART SUPPLEMENT PACIFIC
    2. Terms Modified:
      AERONAUTICAL INFORMATION PUBLICATION (AIP)
      AIR TRAFFIC CONTROL SYSTEM COMMAND CENTER (ATCSCC)
      ALPHANUMERIC DISPLAY
      ALTITUDE READOUT
      AUTOMATED UNICOM
      CHART SUPPLEMENT U.S.
      NAVAID CLASSES
      PRECIPITATION RADAR WEATHER DESCRIPTIONS
      ROUTE ACTION NOTIFICATION
      SAFETY LOGIC SYSTEM ALERTS
      TERMINAL VFR RADAR SERVICE
      TIE-IN FACILITY
      UNICOM
      VOT
    3. Editorial/format changes were made where necessary. Revision bars were not used due to the insignificant nature of the changes.

    Effective: March 21, 2024

    Change: 2

    FAA National Headquarters (FOB−10B), Mission Support Services Policy (AJV-P)

    United States Department of Transportation

    Federal Aviation Administration

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