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Radar equipment specifically designed to
detect all principal features on the surface of an
airport, including aircraft and vehicular traffic, and to
present the entire image on a radar indicator console
in the control tower. Used to augment visual observation
by tower personnel of aircraft and/or vehicular
movements on runways and taxiways.
AIRPORT SURVEILLANCE RADAR− Approach
control radar used to detect and display an aircraft’s
2/17/05 Pilot/Controller Glossary
PCG A−9
position in the terminal area. ASR provides range and
azimuth information but does not provide elevation
data. Coverage of the ASR can extend up to 60 miles.
AIRPORT TAXI CHARTS−
(See AERONAUTICAL CHART.)
AIRPORT TRAFFIC CONTROL SERVICE− A
service provided by a control tower for aircraft
operating on the movement area and in the vicinity of
an airport.
(See MOVEMENT AREA.)
(See TOWER.)
(See ICAO term AERODROME CONTROL
SERVICE.)
AIRPORT TRAFFIC CONTROL TOWER−
(See TOWER.)
AIRSPACE CONFLICT− Predicted conflict of an
aircraft and active Special Activity Airspace (SAA).
AIRSPACE HIERARCHY− Within the airspace
classes, there is a hierarchy and, in the event of an
overlap of airspace: Class A preempts Class B, Class
B preempts Class C, Class C preempts Class D, Class
D preempts Class E, and Class E preempts Class G.
AIRSPEED− The speed of an aircraft relative to its
surrounding air mass. The unqualified term “airspeed”
means one of the following:
a. Indicated Airspeed− The speed shown on the
aircraft airspeed indicator. This is the speed used in
pilot/controller communications under the general
term “airspeed.”
(Refer to 14 CFR Part 1.)
b. True Airspeed− The airspeed of an aircraft
relative to undisturbed air. Used primarily in flight
planning and en route portion of flight. When used in
pilot/controller communications, it is referred to as
“true airspeed” and not shortened to “airspeed.”
AIRSTART− The starting of an aircraft engine while
the aircraft is airborne, preceded by engine shutdown
during training flights or by actual engine failure.
AIRWAY− A Class E airspace area established in the
form of a corridor, the centerline of which is defined
by radio navigational aids.
(See FEDERAL AIRWAYS.)
(See ICAO term AIRWAY.)
(Refer to 14 CFR Part 71.)
(Refer to AIM.)
AIRWAY [ICAO]− A control area or portion thereof
established in the form of corridor equipped with
radio navigational aids.
AIRWAY BEACON− Used to mark airway segments
in remote mountain areas. The light flashes Morse
Code to identify the beacon site.
(Refer to AIM.)
AIT−
(See AUTOMATED INFORMATION
TRANSFER.)
ALERFA (Alert Phase) [ICAO]− A situation wherein
apprehension exists as to the safety of an aircraft and
its occupants.
ALERT− A notification to a position that there
is an aircraft-to-aircraft or aircraft-to-airspace
conflict, as detected by Automated Problem
Detection (APD).
ALERT AREA−
(See SPECIAL USE AIRSPACE.)
ALERT NOTICE− A request originated by a flight
service station (FSS) or an air route traffic control
center (ARTCC) for an extensive communication
search for overdue, unreported, or missing aircraft.
ALERTING SERVICE− A service provided to notify
appropriate organizations regarding aircraft in need
of search and rescue aid and assist such organizations
as required.
ALNOT−
(See ALERT NOTICE.)
ALONG TRACK DISTANCE (LTD)− The distance
measured from a point-in-space by systems using
area navigation reference capabilities that are not
subject to slant range errors.
ALPHANUMERIC DISPLAY− Letters and numerals
used to show identification, altitude, beacon code,
and other information concerning a target on a radar
display.
(See AUTOMATED RADAR TERMINAL
SYSTEMS.)
(See NAS STAGE A.)
ALTERNATE AERODROME [ICAO]− An aerodrome
to which an aircraft may proceed when it
becomes either impossible or inadvisable to proceed
to or to land at the aerodrome of intended landing.
Note: The aerodrome from which a flight departs
may also be an en-route or a destination alternate
aerodrome for the flight.
Pilot/Controller Glossary 8/5/04
PCG A−10
ALTERNATE AIRPORT− An airport at which an
aircraft may land if a landing at the intended airport
becomes inadvisable.
(See ICAO term ALTERNATE AERODROME.)
　
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