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. This Glossary will be revised, as necessary, to maintain a common understanding of the system.

EXPLANATION OF CHANGES

1. Terms Added:
   ADAPTED ROUTES
   AIRSPACE RESERVATION
   DEBRIS RESPONSE AREA (DRA)
   EMBEDDED ROUTE TEXT
   HOT SPOT
   MOVING AIRSPACE RESERVATION
   MOVING ALTITUDE RESERVATION
   STATIONARY AIRSPACE RESERVATION
   
2. Terms Deleted:
   PREFERENTIAL ROUTES
   
3. Terms Modified:
   ALTITUDE RESERVATION (ALTRV)
   CLEARANCE VOID IF NOT OFF BY (TIME)
   MINIMUM SAFE ALTITUDE (MSA)
   OCEANIC ERROR REPORT
   PRECISION APPROACH RADAR
   PREFERRED IFR ROUTES
   STATIONARY ALTITUDE RESERVATION (STATIONARY ALTRV)
   
4. Editorial/format changes were made where necessary. Revision bars were not used due to the insignificant nature of the changes.