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aircraft automatically provide, via a data link, data
derived from on−board navigation and position
fixing systems, including aircraft identification, four
dimensional position and additional data as
appropriate.
AUTOMATIC DEPENDENT SURVEILLANCE−
BROADCAST (ADS-B)− A surveillance system in
which an aircraft or vehicle to be detected is fitted
with cooperative equipment in the form of a data link
transmitter. The aircraft or vehicle periodically
broadcasts its GPS−derived position and other information
such as velocity over the data link, which is
received by a ground−based transmitter/receiver
(transceiver) for processing and display at an air
traffic control facility.
(See GLOBAL POSITIONING SYSTEM.)
(See GROUND−BASED TRANSCEIVER.)
AUTOMATIC DEPENDENT SURVEILLANCE−
CONTRACT (ADS−C)− A data link position reporting
system, controlled by a ground station, that
establishes contracts with an aircraft’s avionics that
occur automatically whenever specific events occur,
or specific time intervals are reached.
AUTOMATIC DIRECTION FINDER− An aircraft
radio navigation system which senses and indicates
the direction to a L/MF nondirectional radio beacon
(NDB) ground transmitter. Direction is indicated to
the pilot as a magnetic bearing or as a relative bearing
to the longitudinal axis of the aircraft depending on
the type of indicator installed in the aircraft. In certain
applications, such as military, ADF operations may
Pilot/Controller Glossary 2/17/05
PCG A−16
be based on airborne and ground transmitters in the
VHF/UHF frequency spectrum.
(See BEARING.)
(See NONDIRECTIONAL BEACON.)
AUTOMATIC TERMINAL INFORMATION SERVICE−
The continuous broadcast of recorded noncontrol
information in selected terminal areas. Its
purpose is to improve controller effectiveness and to
relieve frequency congestion by automating the
repetitive transmission of essential but routine
information; e.g., “Los Angeles information Alfa.
One three zero zero Coordinated Universal Time.
Weather, measured ceiling two thousand overcast,
visibility three, haze, smoke, temperature seven one,
dew point five seven, wind two five zero at five,
altimeter two niner niner six. I-L-S Runway Two Five
Left approach in use, Runway Two Five Right closed,
advise you have Alfa.”
(See ICAO term AUTOMATIC TERMINAL
INFORMATION SERVICE.)
(Refer to AIM.)
AUTOMATIC TERMINAL INFORMATION SERVICE
[ICAO]− The provision of current, routine
information to arriving and departing aircraft by
means of continuous and repetitive broadcasts
throughout the day or a specified portion of the day.
AUTOROTATION− A rotorcraft flight condition in
which the lifting rotor is driven entirely by action of
the air when the rotorcraft is in motion.
a. Autorotative Landing/Touchdown Autorotation.
Used by a pilot to indicate that the landing will
be made without applying power to the rotor.
b. Low Level Autorotation. Commences at an
altitude well below the traffic pattern, usually below
100 feet AGL and is used primarily for tactical
military training.
c. 180 degrees Autorotation. Initiated from a
downwind heading and is commenced well inside the
normal traffic pattern. “Go around” may not be
possible during the latter part of this maneuver.
AVAILABLE LANDING DISTANCE (ALD)− The
portion of a runway available for landing and roll-out
for aircraft cleared for LAHSO. This distance is
measured from the landing threshold to the holdshort
point.
AVIATION WEATHER SERVICE− A service provided
by the National Weather Service (NWS) and
FAA which collects and disseminates pertinent
weather information for pilots, aircraft operators, and
ATC. Available aviation weather reports and forecasts
are displayed at each NWS office and FAA FSS.
(See EN ROUTE FLIGHT ADVISORY
SERVICE.)
(See TRANSCRIBED WEATHER BROADCAST.)
(See WEATHER ADVISORY.)
(Refer to AIM.)
AWW−
(See SEVERE WEATHER FORECAST
ALERTS.)
AZIMUTH (MLS)− A magnetic bearing extending
from an MLS navigation facility.
Note: Azimuth bearings are described as magnetic
and are referred to as “azimuth” in radio telephone
communications.
2/19/04 Pilot/Controller Glossary
PCG B−1
B
BACK-TAXI− A term used by air traffic controllers
to taxi an aircraft on the runway opposite to the traffic
flow. The aircraft may be instructed to back-taxi to
　
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