A Autotuned
NAVAID
A At or Above
(constrained altitude)
AA American
AAATS Australian
Advanced Air Traffic Services
AAC Aeronautical
Administration Communication (a class of communication which supports
administrative communication)
AAS Advanced
Automation System (the end systems for all FAA air traffic control,
located at the ARTCCs)
AATT Advanced
Aviation Transportation Technology
ABM Abeam
A/C Aircraft
AC Air Canada
ACARS Aircraft
Communications Addressing and Reporting System
ACARS ARINC
communications and address reporting system (digital communications
system used primarily for aircraft-to-airline messages)
ACARS MU ACARS
Management Unit
ACAS Airborne
Collision and Avoidance System
ACF Area Control
Facility
ACFS Advanced
Concepts Flight Simulator (a generic "glass cockpit")
ACK Acknowledge
ACMS Aircraft
Condition Monitoring System
ACT Active
ADC Air Data
Computer
ADF Automatic
Direction Finder
ADI Attitude
Director lndicator
ADLP Aircraft
Data Link Processor (the Mode S subnetwork function onboard the
aircraft that implements the OSI network layer protocols)
ADMA Aviation
Distributors and Manufactureres Association
ADS Automatic
Dependent Surveillance
AECB Atomic
Energy Control Board
AERA Automated
Enroute ATC
AFCS Automatic
Flight Control System
AFDS Autopilot
Flight Director System (also A/P F/D)
AFS Automatic
Flight System
AGATE Advanced
General Aviation Transport Experiments
AGL Above Ground
Level
AHRS Attitude
Heading Reference System
AIRS Advanced
Infrared Sounder
A/l Anti-ice
AI Artificial
Intelligence
AL Allegheny
Alert Indicator
(visual or auditory) which provides information to the flightcrew
in a timely manner about an event requiring pilot awareness.
ALPA Air Line
Pilots Association
ALT Altitude
ALT Alternate
ALTN Alternate
ALT HOLD Altitude
Hold Mode
AM Amplitude
Modulation
AM Aeromexico
AMSS Aeronautical
Mobile Satellite Service
ANA All Nippon
Airways
AOA Angle-of-Attack
AOA
Airport Operations Area
AOC Aeronautical
Operation Control (communications which support safety and regularity
of flight that normally take place between aircraft and the operator)
AOCS Attitude
and Orbit Control System
AOM Aircraft
Operating Manual
AOPA Aircraft
Owners and Pilots Association
A/P Autopilot
APA Allied Pilots
Association
APC Aeronautical
Passenger Communication (a class of communication which supports
passenger communication)
APMS Automated
Performance Measurement System
APPR Approach/Approach
Mode
APR April
APRT Airport
APU Auxiliary
Power Unit
AQP Advanced
Qualification Program
ARAC Aviation
Rulemaking Advisory Committee
ARINC Aeronautical
Radio Incorporated
ARPA Advanced
Research Projects Agency
ARR Arrival
ARTCC Air Route
Traffic Control Center
ARTS Automated
Radar Terminal System
ASCII American
Standard Code for Interface and Interchange
ASI Air Speed
Indicator
ASR Airport
Surveillance Radar
ASRS Aviation
Safety Reporting System (aviation incident reporting system run
by NASA for FAA)
AT At (an altitude)
A/T Autothrottle
ATA Air Transport
Association
ATA Actual Time
of Arrival
ATC Air Traffic
Control (a generic term for a joint civil/military system for
controlling traffic within a specific area)
ATCS Advanced
Train Control Systems
ATCSCC Air Traffic
Control System Command Center
ATHR Autothrust
System
ATIS Automatic
Terminal Information Service (recorded voice message that provides
weather and airport services information)
ATM Air Transportation
Management
ATN Aeronautical
Telecommunications Network (the collection of ground subnetworks,
air/ground subnetworks and airborne subnetworks interconnected
by ATN routers that support computer-to-computer, internetwork
communication and message transfer between host computers using
the OSI ISO protocol architecture)
ATS Automatic
Throttle System
ATSC Air Traffic
Service Communications (Communications related to air traffic
services. This includes ATC, aeronautical and meteorological information,
position reporting and services related to safety and regularity
of flight)
AUG August
AV Avianca
AVAIL Available
AVHRR Advanced
Very High-Resolution Radiometer
AWACS Airborne
Warning And Control System
AWAS Automated
Weather Advisory Station
AWIPS Advanced
Weather Interactive Processing System