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Pilot/Controller Glossary 

12/2/21 

AIM

 

(See AERONAUTICAL INFORMATION 

MANUAL.) 

AIP [ICAO]

 

(See ICAO term AERONAUTICAL 

INFORMATION PUBLICATION.) 

AIR CARRIER DISTRICT OFFICE

 An FAA field 

office serving an assigned geographical area, staffed 
with Flight Standards personnel serving the aviation 
industry and the general public on matters related to 
the certification and operation of scheduled air 
carriers and other large aircraft operations. 

AIR DEFENSE EMERGENCY

 A military emer­

gency condition declared by a designated authority. 
This condition exists when an attack upon the 
continental U.S., Alaska, Canada, or U.S. installa­
tions in Greenland by hostile aircraft or missiles is 
considered probable, is imminent, or is taking place. 

(Refer to AIM.) 

AIR DEFENSE IDENTIFICATION ZONE (ADIZ)

 

An area of airspace over land or water in which the 
ready identification, location, and control of all 
aircraft (except for Department of Defense and law 
enforcement aircraft) is required in the interest of 
national security. 

Note: ADIZ locations and operating and flight plan 

requirements for civil aircraft operations are 
specified in 14 CFR Part 99. 

(Refer to AIM.) 

AIR NAVIGATION FACILITY

 Any facility used 

in, available for use in, or designed for use in, aid of 
air navigation, including landing areas, lights, any 
apparatus or equipment for disseminating weather 
information, for signaling, for radio­directional 
finding, or for radio or other electrical communica­
tion, and any other structure or mechanism having a 
similar purpose for guiding or controlling flight in the 
air or the landing and takeoff of aircraft. 

(See NAVIGATIONAL AID.) 

AIR ROUTE SURVEILLANCE RADAR

 Air route 

traffic control center (ARTCC) radar used primarily 
to detect and display an aircraft’s position while en 
route between terminal areas. The ARSR enables 
controllers to provide radar air traffic control service 
when aircraft are within the ARSR coverage. In some 
instances, ARSR may enable an ARTCC to provide 
terminal radar services similar to but usually more 

limited than those provided by a radar approach 
control. 

AIR ROUTE TRAFFIC CONTROL CENTER 
(ARTCC)

 A facility established to provide air traffic 

control service to aircraft operating on IFR flight 
plans within controlled airspace and principally 
during the en route phase of flight. When equipment 
capabilities and controller workload permit, certain 
advisory/assistance services may be provided to VFR 
aircraft. 

(See EN ROUTE AIR TRAFFIC CONTROL 

SERVICES.) 

(Refer to AIM.) 

AIR TAXI

 Used to describe a helicopter/VTOL 

aircraft movement conducted above the surface but 
normally not above 100 feet AGL. The aircraft may 
proceed either via hover taxi or flight at speeds more 
than 20 knots. The pilot is solely responsible for 
selecting a safe airspeed/altitude for the operation 
being conducted. 

(See HOVER TAXI.) 
(Refer to AIM.) 

AIR TRAFFIC

 Aircraft operating in the air or on an 

airport surface, exclusive of loading ramps and 
parking areas. 

(See ICAO term AIR TRAFFIC.) 

AIR TRAFFIC [ICAO]

 All aircraft in flight or 

operating on the maneuvering area of an aerodrome. 

AIR TRAFFIC CLEARANCE

 An authorization by 

air traffic control for the purpose of preventing 
collision between known aircraft, for an aircraft to 
proceed under specified traffic conditions within 
controlled airspace. The pilot­in­command of an 
aircraft may not deviate from the provisions of a 
visual flight rules (VFR) or instrument flight rules 
(IFR) air traffic clearance except in an emergency or 
unless an amended clearance has been obtained. 
Additionally, the pilot may request a different 
clearance from that which has been issued by air 
traffic control (ATC) if information available to the 
pilot makes another course of action more practicable 
or if aircraft equipment limitations or company 
procedures forbid compliance with the clearance 
issued. Pilots may also request clarification or 
amendment, as appropriate, any time a clearance is 
not fully understood, or considered unacceptable 
because of safety of flight. Controllers should, in 
such instances and to the extent of operational 
practicality and safety, honor the pilot’s request. 

PCG A