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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