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maintained until reaching a specific point or time.
Altitude restrictions may be issued by ATC due to
traffic, terrain, or other airspace considerations.
ALTITUDE RESTRICTIONS ARE CANCELEDAdherence
to previously imposed altitude restrictions
is no longer required during a climb or descent.
ALTRV-
(See ALTITUDE RESERVATION.)
AMVER-
(See AUTOMATED MUTUAL‐ASSISTANCE
VESSEL RESCUE SYSTEM.)
APB-
(See AUTOMATED PROBLEM DETECTION
BOUNDARY.)
Pilot/Controller Glossary 7/31/08
2/14/08 Pilot/Controller Glossary
PCG A-11
APD-
(See AUTOMATED PROBLEM DETECTION.)
APDIA-
(See AUTOMATED PROBLEM DETECTION
INHIBITED AREA.)
APPROACH CLEARANCE- Authorization by
ATC for a pilot to conduct an instrument approach.
The type of instrument approach for which a
clearance and other pertinent information is provided
in the approach clearance when required.
(See CLEARED APPROACH.)
(See INSTRUMENT APPROACH
PROCEDURE.)
(Refer to AIM.)
(Refer to 14 CFR Part 91.)
APPROACH CONTROL FACILITY- A terminal
ATC facility that provides approach control service in
a terminal area.
(See APPROACH CONTROL SERVICE.)
(See RADAR APPROACH CONTROL
FACILITY.)
APPROACH CONTROL SERVICE- Air traffic
control service provided by an approach control
facility for arriving and departing VFR/IFR aircraft
and, on occasion, en route aircraft. At some airports
not served by an approach control facility, the
ARTCC provides limited approach control service.
(See ICAO term APPROACH CONTROL
SERVICE.)
(Refer to AIM.)
APPROACH CONTROL SERVICE [ICAO]- Air
traffic control service for arriving or departing
controlled flights.
APPROACH GATE- An imaginary point used
within ATC as a basis for vectoring aircraft to the
final approach course. The gate will be established
along the final approach course 1 mile from the final
approach fix on the side away from the airport and
will be no closer than 5 miles from the landing
threshold.
APPROACH LIGHT SYSTEM-
(See AIRPORT LIGHTING.)
APPROACH SEQUENCE- The order in which
aircraft are positioned while on approach or awaiting
approach clearance.
(See LANDING SEQUENCE.)
(See ICAO term APPROACH SEQUENCE.)
APPROACH SEQUENCE [ICAO]- The order in
which two or more aircraft are cleared to approach to
land at the aerodrome.
APPROACH SPEED- The recommended speed
contained in aircraft manuals used by pilots when
making an approach to landing. This speed will vary
for different segments of an approach as well as for
aircraft weight and configuration.
APPROPRIATE ATS AUTHORITY [ICAO]- The
relevant authority designated by the State responsible
for providing air traffic services in the airspace
concerned. In the United States, the “appropriate ATS
authority” is the Program Director for Air Traffic
Planning and Procedures, ATP‐1.
APPROPRIATE AUTHORITYa.
Regarding flight over the high seas: the relevant
authority is the State of Registry.
b. Regarding flight over other than the high seas:
the relevant authority is the State having sovereignty
over the territory being overflown.
APPROPRIATE OBSTACLE CLEARANCE
MINIMUM ALTITUDE- Any of the following:
(See MINIMUM EN ROUTE IFR ALTITUDE.)
(See MINIMUM IFR ALTITUDE.)
(See MINIMUM OBSTRUCTION CLEARANCE
ALTITUDE.)
(See MINIMUM VECTORING ALTITUDE.)
APPROPRIATE TERRAIN CLEARANCE
MINIMUM ALTITUDE- Any of the following:
(See MINIMUM EN ROUTE IFR ALTITUDE.)
(See MINIMUM IFR ALTITUDE.)
(See MINIMUM OBSTRUCTION CLEARANCE
ALTITUDE.)
(See MINIMUM VECTORING ALTITUDE.)
APRON- A defined area on an airport or heliport
intended to accommodate aircraft for purposes of
loading or unloading passengers or cargo, refueling,
parking, or maintenance. With regard to seaplanes, a
ramp is used for access to the apron from the water.
(See ICAO term APRON.)
APRON [ICAO]- A defined area, on a land
aerodrome, intended to accommodate aircraft for
purposes of loading or unloading passengers, mail or
cargo, refueling, parking or maintenance.
ARC- The track over the ground of an aircraft flying
at a constant distance from a navigational aid by
reference to distance measuring equipment (DME).
7/31/
2/14/PCG A-12
AREA CONTROL CENTER [ICAO]- An air traffic
control facility primarily responsible for ATC
services being provided IFR aircraft during the en
route phase of flight. The U.S. equivalent facility is
an air route traffic control center (ARTCC).
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