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considered probable, is imminent, or is taking place.
(Refer to AIM.)
AIR DEFENSE IDENTIFICATION ZONE (ADIZ)-
The area of airspace over land or water, extending
upward from the surface, within which the ready
identification, the location, and the control of aircraft
are required in the interest of national security.
a. Domestic Air Defense Identification Zone. An
ADIZ within the United States along an international
boundary of the United States.
b. Coastal Air Defense Identification Zone. An
ADIZ over the coastal waters of the United States.
c. Distant Early Warning Identification Zone
(DEWIZ). An ADIZ over the coastal waters of the
State of Alaska.
d. Land-Based Air Defense Identification Zone.
An ADIZ over U.S. metropolitan areas, which is
activated and deactivated as needed, with dimensions,
activation dates and other relevant information
disseminated via NOTAM.
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 communication,
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- 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.)
Pilot/Controller Glossary 7/31/08
2/14/08 Pilot/Controller Glossary
PCG A-5
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
final authority as to, the operation of that aircraft.”
THE PILOT IS RESPONSIBLE TO REQUEST AN
AMENDED CLEARANCE if ATC issues a
clearance that would cause a pilot to deviate from a
rule or regulation, or in the pilot's opinion, would
　
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