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the adapted vertex for each arrival aircraft based upon
runway configuration, airport acceptance rate, airport
arrival delay period, and other metered arrival
aircraft. This time is either the vertex time of arrival
(VTA) of the aircraft or the tentative calculated
landing time (TCLT)/ACLT of the previous aircraft
plus the arrival aircraft interval (AAI), whichever is
later. This time will not be updated in response to the
aircraft's progress.
ACTUAL NAVIGATION PERFORMANCE
(ANP)-
(See REQUIRED NAVIGATION
PERFORMANCE.)
ADDITIONAL SERVICES- Advisory information
provided by ATC which includes but is not limited to
the following:
a. Traffic advisories.
b. Vectors, when requested by the pilot, to assist
aircraft receiving traffic advisories to avoid observed
traffic.
Pilot/Controller Glossary 2/14/08
PCG A-2
c. Altitude deviation information of 300 feet or
more from an assigned altitude as observed on a
verified (reading correctly) automatic altitude
readout (Mode C).
d. Advisories that traffic is no longer a factor.
e. Weather and chaff information.
f. Weather assistance.
g. Bird activity information.
h. Holding pattern surveillance. Additional services
are provided to the extent possible contingent
only upon the controller's capability to fit them into
the performance of higher priority duties and on the
basis of limitations of the radar, volume of traffic,
frequency congestion, and controller workload. The
controller has complete discretion for determining if
he/she is able to provide or continue to provide a
service in a particular case. The controller's reason
not to provide or continue to provide a service in a
particular case is not subject to question by the pilot
and need not be made known to him/her.
(See TRAFFIC ADVISORIES.)
(Refer to AIM.)
ADF-
(See AUTOMATIC DIRECTION FINDER.)
ADIZ-
(See AIR DEFENSE IDENTIFICATION ZONE.)
ADLY-
(See ARRIVAL DELAY.)
ADMINISTRATOR- The Federal Aviation Administrator
or any person to whom he/she has delegated
his/her authority in the matter concerned.
ADR-
(See AIRPORT DEPARTURE RATE.)
ADS [ICAO]-
(See ICAO term AUTOMATIC DEPENDENT
SURVEILLANCE.)
ADS-B-
(See AUTOMATIC DEPENDENT
SURVEILLANCE-BROADCAST.)
ADS-C-
(See AUTOMATIC DEPENDENT
SURVEILLANCE-CONTRACT.)
ADVISE INTENTIONS- Tell me what you plan to
do.
ADVISORY- Advice and information provided to
assist pilots in the safe conduct of flight and aircraft
movement.
(See ADVISORY SERVICE.)
ADVISORY FREQUENCY- The appropriate frequency
to be used for Airport Advisory Service.
(See LOCAL AIRPORT ADVISORY.)
(See UNICOM.)
(Refer to ADVISORY CIRCULAR NO. 90‐42.)
(Refer to AIM.)
ADVISORY SERVICE- Advice and information
provided by a facility to assist pilots in the safe
conduct of flight and aircraft movement.
(See ADDITIONAL SERVICES.)
(See EN ROUTE FLIGHT ADVISORY
SERVICE.)
(See LOCAL AIRPORT ADVISORY.)
(See RADAR ADVISORY.)
(See SAFETY ALERT.)
(See TRAFFIC ADVISORIES.)
(Refer to AIM.)
AERIAL REFUELING- A procedure used by the
military to transfer fuel from one aircraft to another
during flight.
(Refer to VFR/IFR Wall Planning Charts.)
AERODROME- A defined area on land or water
(including any buildings, installations and equipment)
intended to be used either wholly or in part for
the arrival, departure, and movement of aircraft.
AERODROME BEACON [ICAO]- Aeronautical
beacon used to indicate the location of an aerodrome
from the air.
AERODROME CONTROL SERVICE [ICAO]- Air
traffic control service for aerodrome traffic.
AERODROME CONTROL TOWER [ICAO]- A
unit established to provide air traffic control service
to aerodrome traffic.
AERODROME ELEVATION [ICAO]- The elevation
of the highest point of the landing area.
AERODROME TRAFFIC CIRCUIT [ICAO]- The
specified path to be flown by aircraft operating in the
vicinity of an aerodrome.
AERONAUTICAL BEACON- A visual NAVAID
displaying flashes of white and/or colored light to
indicate the location of an airport, a heliport, a
2/14/08 Pilot/Controller Glossary
PCG A-3
landmark, a certain point of a Federal airway in
mountainous terrain, or an obstruction.
(See AIRPORT ROTATING BEACON.)
(Refer to AIM.)
AERONAUTICAL CHART- A map used in air
navigation containing all or part of the following:
topographic features, hazards and obstructions,
navigation aids, navigation routes, designated
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