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Pilot/Controller Glossary

3/29/18

PCG A−4

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 radio-directional

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 pilot-in-command 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.

14 CFR Part 91.3(a) states: “The pilot in command

of an aircraft is directly responsible for, and is the