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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.
c. Programmable Indicator Data Processor
(PIDP). The PIDP is a modification to the
AN/TPX-42 interrogator system currently installed
in fixed RAPCONs. The PIDP detects, tracks, and
predicts secondary radar aircraft targets. These are
displayed by means of computer-generated symbols
and alphanumeric characters depicting flight identification,
aircraft altitude, ground speed, and flight plan
data. Although primary radar targets are not tracked,
they are displayed coincident with the secondary
radar targets as well as with the other symbols and
alphanumerics. The system has the capability of
interfacing with ARTCCs.
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 Observing
System (ASOS), Automated Weather Sensor
System (AWSS) and Automated Weather Observation
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 Airport/Facility Directory 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 SYSTEMU.
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 SURVEILLANCEBROADCAST
(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 SURVEILLANCECONTRACT
(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
7/31/
2/14/PCG A-16
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
SERVICE (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, breaking action,
airport NOTAMs, and other applicable information.
The information is continuously broadcast over a
discrete VHF radio frequency (usually the ASOS
frequency.)
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
　
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