9/5/24 

Pilot/Controller Glossary 

PILOT/CONTROLLER 

GLOSSARY 

PURPOSE 

a. 

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. 

b. 

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). 

c. 

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].” 

d. 

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

EXPLANATION OF CHANGES 

e. 

Terms Added: 

SPECIAL MILITARY ACTIVITY ROUTE (SMAR) 

WEATHER RADAR PRECIPITATION INTENSITY 

f. 

Terms Deleted: 

PRECIPITATION RADAR WEATHER DESCRIPTIONS 

g. 

Terms Modified: 

ADAPTED ROUTES 

DEVIATIONS 

h. 

Editorial/format changes were made where necessary. Revision bars were not used due to the insignificant 

nature of the changes. 

PCG

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