Pilot/Controller Glossary
5/19/22
AUTOMATIC ALTITUDE REPORTING
−
That
function of a transponder which responds to Mode C
interrogations by transmitting the aircraft’s altitude
in 100-foot increments.
AUTOMATIC CARRIER LANDING SYSTEM
−
U.S. Navy final approach equipment consisting of
precision tracking radar coupled to a computer data
link to provide continuous information to the aircraft,
monitoring capability to the pilot, and a backup
approach system.
AUTOMATIC DEPENDENT SURVEILLANCE
(ADS) [ICAO]
−
A surveillance technique in which
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 GNSS
−
derived position and other
required information such as identity and velocity,
which is then received by a ground
−
based or
space
−
based receiver for processing and display at an
air traffic control facility, as well as by suitably
equipped aircraft.
(See AUTOMATIC DEPENDENT
SURVEILLANCE
−
BROADCAST IN.)
(See AUTOMATIC DEPENDENT
SURVEILLANCE
−
BROADCAST OUT.)
(See COOPERATIVE SURVEILLANCE.)
(See GLOBAL POSITIONING SYSTEM.)
(See SPACE
−
BASED ADS
−
B.)
AUTOMATIC DEPENDENT SURVEILLANCE
−
BROADCAST IN (ADS
−
B In)
−
Aircraft avionics
capable of receiving ADS
−
B Out transmissions
directly from other aircraft, as well as traffic or
weather information transmitted from ground
stations.
(See AUTOMATIC DEPENDENT
SURVEILLANCE
−
BROADCAST OUT.)
(See AUTOMATIC DEPENDENT
SURVEILLANCE
−
REBROADCAST.)
(See FLIGHT INFORMATION
SERVICE
−
BROADCAST.)
(See TRAFFIC INFORMATION
SERVICE
−
BROADCAST.)
AUTOMATIC DEPENDENT SURVEILLANCE
−
BROADCAST OUT (ADS
−
B Out)
−
The transmitter
onboard an aircraft or ground vehicle that
periodically broadcasts its GNSS
−
derived position
along with other required information, such as
identity, altitude, and velocity.
(See AUTOMATIC DEPENDENT
SURVEILLANCE
−
BROADCAST.)
(See AUTOMATIC DEPENDENT
SURVEILLANCE
−
BROADCAST IN.)
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 DEPENDENT SURVEILLANCE-
REBROADCAST (ADS-R)
−
A datalink translation
function of the ADS
−
B ground system required to
accommodate the two separate operating frequencies
(978 MHz and 1090 MHz). The ADS
−
B system
receives the ADS
−
B messages transmitted on one
frequency and ADS
−
R translates and reformats the
information for rebroadcast and use on the other
frequency. This allows ADS
−
B In equipped aircraft
to see nearby ADS
−
B Out traffic regardless of the
operating link of the other aircraft. Aircraft operating
on the same ADS
−
B frequency exchange information
directly and do not require the ADS
−
R translation
function.
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
be based on airborne and ground transmitters in the
VHF/UHF frequency spectrum.
(See BEARING.)
(See NONDIRECTIONAL BEACON.)
AUTOMATIC FLIGHT INFORMATION SER-
VICE (AFIS)
−
ALASKA FSSs ONLY
−
The
continuous broadcast of recorded non
−
control
information at airports in Alaska where a FSS
provides local airport advisory service. The AFIS
broadcast automates the repetitive transmission of
essential but routine information such as weather,
wind, altimeter, favored runway, braking action,
PCG A
−
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