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Pilot/Controller Glossary

3/29/18

PCG A

−15

terminal area within which APD is inhibited for all
flights within that airspace.

AUTOMATED RADAR TERMINAL SYSTEMS
(ARTS)

− A generic term for several tracking systems

included in the Terminal Automation Systems (TAS).
ARTS plus a suffix roman numeral denotes a major
modification to that system.

a.

ARTS IIIA. The Radar Tracking and Beacon

Tracking Level (RT&BTL) of the modular, program-
mable automated radar terminal system. ARTS IIIA
detects, tracks, and predicts primary as well as
secondary radar-derived aircraft targets. This more
sophisticated computer-driven system upgrades the
existing ARTS III system by providing improved
tracking, continuous data recording, and fail-soft
capabilities.

b.

Common ARTS. Includes ARTS IIE, ARTS

IIIE; and ARTS IIIE with ACD (see DTAS) which
combines functionalities of the previous ARTS
systems.

AUTOMATED WEATHER SYSTEM

− Any of the

automated weather sensor platforms that collect
weather data at airports and disseminate the weather
information via radio and/or landline. The systems
currently consist of the Automated Surface Observ-
ing System (ASOS), Automated Weather Sensor
System (AWSS) and Automated Weather Observa-
tion System (AWOS).

AUTOMATED UNICOM

− Provides completely

automated weather, radio check capability and airport
advisory information on an Automated UNICOM
system. These systems offer a variety of features,
typically selectable by microphone clicks, on the
UNICOM frequency. Availability will be published
in the Chart Supplement U.S. and approach charts.

AUTOMATIC ALTITUDE REPORT

(See ALTITUDE READOUT.)

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 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 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