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Aeronautical Information Manual (AIM), page 623

5/26/16
12/10/15

AUTOMATED PROBLEM DETECTION IN-
HIBITED AREA (APDIA)- Airspace surrounding a
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,
programmable 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 up-
grades 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,
Pilot/Controller Glossary

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) is a datalink translation
function of the ADS-B ground system required to
accommodate the two separate operating frequencies
(978 MHz and 1090 ES). 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

PCG A-15

Page 623 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   622 -- Page 623 -- 624