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-1-9-

1 PPS : One Pulse Per Second
1 :1 : One-to-one relationship
1 :M : One-to-Many relationship
16PF : Sixteen Personality Factor Questionnaire
2D : Two Dimensional
3D : Three Dimensional

3D : Palair Macedonian (airline)
4D : Four Dimensional
4D FMS : 4D Flight Management System
4D-NAV : 4D Navigation
4DTN : 4D Trajectory Negotiation
4-MASt : 4-MAST group

5LNC : Five Letter Name Code
5-ST-RSG : 5-States Route Structure Group
5-STRSSG : 5-States Route Structure Steering Group
5-SRSWG : 5-States Route Structure Working Group
8.33 CP : 8.33 Contact Person
8.33 PMC : 8.33 Programme Management Cell
8.33 State : A State initially implementing 8.33 kHz channel spacing

-A-

A : Amber

A : Ampere

A : At or Above (constrained altitude)

A : Autotuned NAVAID
A : Austria

A SMGCS : Advanced Surface Movement Guidance and Control Systems

A/A : Air/Air
A/C, a/c : Aircraft
A/D : Analog-to-Digital
A/D Converter : Analogue-to Digital Converter
A/G : Air-Ground
A/I : Accident(s)/Incident(s)

A/l : Anti-ice
A/L : Auto Land 
A/P : Autopilot

A/T : Autothrottle

AA : American
AA : Approved agency

AAA: Advanced ATC System Amsterdam
AAA : Aesean Airliners Association

AAA : (or AAB, AAC...etc., in sequence) Amended meteorological message (message type designator)

AAATS : Australian Advanced Air Traffic Services  
AAC : Alpha Attenuation Coefficient

AAC : Aeronautical Administration Communication (a class of communication which supports administrative communication)

AAC : Airline Administrative Communication

AACC : Airport Associations Co-ordinating Council

AACE : Airfield Approach Control Element
AACI : Airports Association Council International
AACO : Arab Air Carriers Organisation

AAD : Assigned Altitude Deviation
AAF : ATM Added Functions
AAFCE : Allied Air Forces Central Europe
AAFG : ATM Added Functionality Sub-Group
AAG : AIS Automation Group 
AAGDI / AGADE : Automated Air/Ground Data Interchange
AAH : Autonomous Aircraft Hybrid

AAIB : Air Accident Investigation Branch (UK equivalent of NTSB)
AAIM : Aircraft Autonomous Integrity Monitoring

AAIS : Automated AIS

AAL : Above Aerodrome level
AALS : Advanced Approach and Landing System
AAM : Airbus Asset Management

AAM :  Airline Administration Message

AAME : Association of Aviation Medical Examiners
AAP : Advanced Automation Program

AAPA: Association of Asia Pacific Airlines

AAR : Airport Acceptance Rate or Airport Arrival Rate
AAR : Air-to-Air Refuelling

AAS : Advanced Automation System (the end systems for all FAA air traffic control, located at the ARTCCs

AASA : Air Lines Association of Southern Africa

AASC : Airport Authorities Steering Committee
AASI : Aeronautical Applications Service Interface
AASR : Airways and Airport Surveillance Radar
AAT : Alpha Attenuation Test

AATF : Airworthiness Assurance Task Force

AATMS : Advanced Air Traffic Management System

AATT : Advanced Aviation Transportation Technology
AAUI : Aeronautical Applications User Interface
AB : Action Button (mouse)
ABAS : Aircraft-based Augmentation System 
ABC : ATC Bypass Complex

ABET : Airspace Behavioural Engineering Technology 
ABFG : ATM Basic Functions Sub-Group
ABI : Advance Boundary Information

ABM : Abeam

ABN : Aerodrome Airport Beacon
ABPSK : Aviation Binary Phase Shift Keying

ABT : About

ABV : Above

AC : Air Canada
AC : Alternating Current

AC : Altocumulus
AC : Assessment Centre
AC : Assistant Controller
AC : Advisory Circular 
ACA : Air Traffic Centre Architecture 
ACA : Airport Co-ordinators Association
ACA : Airspace Control Activity
ACA : AUP / UUP Composition application (software)

ACA : Austrian Cockpit Association

ACAC : Arab Civil Aviation Council
Acad : Academic establishments
ACAD : Auto Computer Aided Design (Operator-Input + Display System)
ACAG : Airspace Co-ordination Agencies
ACAM : Airport Capacity Airside Modelling

ACAMS : Aircraft Condition Analysis and Management System
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 Avoidance System
ACAS I : Aircraft Collision Avoidance System Version 1 
ACAS II : Aircraft Collision Avoidance System Version 2 
ACAS III : Aircraft Collision Avoidance System Version 3
ACASA : ACAS Analysis
ACATF : ATC Centre Communications Architecture Task Force

ACB : Aeroclub
ACC : Area Control Centre
ACC Controller : Area Controller
ACC Loop : Anticipation-Action-Comparison Loop 
ACCA : Air Charters Carriers Association

ACCC : Australian Competition and Consumer Commission
ACCEL : Accelerate
ACCESS : Aircraft Control Console for Experiments and Simulations Studies

ACCID : Notification of an aircraft accident
ACC-PC : ACC Planning Controller
ACCS : Air Command and Control System 
ACC-TC : ACC Tactical Controller

ACCUM : Accumulate

ACDAC : Asociacion Colombiana de Aviadores Civiles
ACDMD : Air Collaborative Decision Making Demonstrator
ACE : Allied Command Europe
ACE : Altimeter Control Equipment
ACE : ATC Communications Environment

ACF : Area Control Facility. See ACC or ARTC

ACFS : Advanced Concepts Flight Simulator (a generic "glass cockpit")
ACFT : Aircraft
ACG : Advanced ATS Concept Group
ACG : Advanced Concept Group  
ACG : ATN/CNS Consultation Group

ACG : ATS System Concept Working Group
ACG : Austro Control GmbH
ACH : ATC Flight Plan Change Message 
ACH : ATC Flight Plan Change 
ACI : Airports Council International
ACI : Area of Common Interest 
ACID : Aircraft Identification (ICAO)

ACIPLA : Asociacian Civil de Pilotos de Lineas Aereas (Uruquay)
ACK : Acknowledge(ment) message

ACL : Altimeter Check Location
ACL : ATC Clearances
ACM : Acceptance of (Radar) Co-ordination Message

ACM : Acceptable Means of Compliance
ACM : Airspace Control Measures
ACM : ATC Communication Management
ACMS : Aircraft Condition Monitoring System
ACN : Aircraft Classification Number
ACN : Airspace Co-ordination Notification
ACN : Austrian Communication Network

ACNZ : Airways Corporation of New Zealand
ACO : Airspace Co-ordination Order
ACOD : Area Conflict Detection
ACP : Accept Message
ACP : Acceptance Message
ACP : African, Caribbean and Pacific States
ACP : Aircraft Control Position (window)
ACP : Airspace Control Plan
ACP : Airspace Crossing Acceptance Message
ACP : Allied Communications Publication
ACP : Azimuth Change/Count Pulses
ACP : Area Control Procedural
ACPO : Aircraft Position Operator
ACPSC : Advisory Committee on Procurement and Sales Contracts (Eurocontrol/DF)

ACPT : Accept or Accepted

ACR : Air Carrier
ACR : Atlantic Co-ordinated Route

ACRPWG : Aircraft Crash Recovery Procedures Working Group

 ACS : Advanced Communication System 
ACS : Airspace Control System
ACS : Area Control Surveillance
ACSA : Allied Communications Security Agency
ACSE : Application Control Service Element

ACT : Active  
ACT : Activation message designator

ACT : ATC Activation message
ACT/LAM : Activation Message / Logical Acknowledgement Message
ACTF : Aeronautical Charting Task Force
ACU : Airspace / Antenna Control Unit. See BSU
AD : Administrative Domain  (ENOC)
AD : Aerodrome
AD : Air Defence
AD : Airworthiness Directive

AD : CFMU/FDOD - Airspace Data Section
ADA : Advisory Area
ADAGES : Action Plan Definition on the Basis of Architecture studies from GAAS for EATMS

ADAP : Automated Downlink of Airborne Parameters
ADAPT : ATS Data Acquisition, Processing and Transfer Panel (ICAO)
ADC : Air Defence Centre / Command
ADC : Air Data Computer
ADC : Analog to Digital Converter
ADCA : Air Defence Classification Area
ADCE : Aircraft Data Circuit-Terminating Equipment
ADCP : Air Defence Command Post
ADD : Architectural Design Document 
ADD : Average Delay per Delayed Flight
ADDI : Automated Digital Data Interchange (ICAO)

ADDN : Addition or Additional

ADDR : Address
ADE : Air Defence Element
ADE : Autonomous Display Equipment
ADEG : ATS Data Exchange Group
ADEP : Aerodrome of Departure
ADES : Aerodrome of Destination
ADEXA : Air Defence Exercise Area
ADEXP : ATS Data Exchange Presentation (message format used for IFPS) ; ATS Data Exchange Program Format

ADF : Automatic Direction Finder
ADFL : Augmented Dynamic Flight Leg

ADIRS : Air Data Inertial Reference System
ADGE : Air Defence Ground Environment

ADJ : Adjacent
ADI : Aerodrome Control Instrument

ADI : Attitude Director lndicator
ADI : Attitude Display Indicator
ADIDS : Advanced Data & Image Distribution System (CCTV Application)
ADIRS : Air Data Inertial Reference System

ADIRU : Air Data Inertial Reference Unit

ADIS : Automatic dependent surveillance and Data Link Interim System

ADIS : Automatic dependent surveillance and Data Link Interim System
ADIS (P) : Automated Data Interchange System (Panel) - ICAO
ADIZ : Air Defence Identification Zone
ADLP : Aircraft Data Link Processor (the Mode S subnetwork function onboard the aircraft that implements the OSI network layer protocols)
ADM : Administrative / Administration

ADM : Aeronautical Decision Making
ADM : Average Delay per Movement
ADM : Airborne Data Bus

ADM : Air Data Module

ADMA : Aviation Distributors and Manufactureres Association
ADMD : Airspace Data Management & Distribution
ADNC : Air Defence Notification Centre (GR)
ADNS : Aeronautical Radio Incorporated Data Network Service
ADOC : Air Defence Operations Centre
ADOLT : Air Defence Liaison Team
ADORA : Analysis and Definition of the Operational Requirements for ATM
ADP : Activity Predictor Display

ADP : ATFM Daily Plan
ADP : Automated Data Processing or Auxiliary Data Processing
ADPG : ATM Data Processing Sub-Group
ADR : Advisory Route
ADR : Air Data Reference
ADR : Airfield Damage Repair
ADR : Average Delay per Regulated Flight
ADREP : Accident/Incident Reporting System
ADRS : Air Defence Radar Site

ADS : Air Data System
ADS : Automatic Dependent Surveillance
ADS-A : Automatic Dependent Surveillance-Addressed
ADS-B : Automatic Dependent Surveillance-Broadcast
ADS-C : Automatic Dependent Surveillance-Contract
ADS-P : Automatic Dependent Surveillance-Panel (ICAO)
ADS-R : Automatic Dependent Surveillance-Report
ADSEL : Address Selective SSR System (UK)
ADSIA : Allied Data Systems Interoperability Agency
ADSP : ADS Processor

ADSP : Automatic Dependent Surveillance Panel (ICAO)
ADSU : ADS Unit

ADT : Air Data Tester
ADT : Approved Departure Time
ADTI : Additional Technical Information (ODS - ESCO)
ADUG : Airport Database User Group
ADV : Aerodrome Control Visual
ADVON : Advanced Echelon

ADZ : Advise

ADZD : Advised

ADZY : Advisory
AE : ATM Engineering
AE : Application Entity

AE : United  Arab Emirates (ISO Country Code)
AEA : Association of European Airlines

AECB : Atomic Energy Control Board
AECG : ACAS Evaluation and Co-ordination Group

AFCS Automatic Flight Control System
AEEC : Airlines Electronic Engineering Committee
AEFMP : Algeria, Spain, France, Maroc, Portugal Project
AEGIS : Airborne Early Warning Ground Environment Integrated Segment
AEGIS : ATM European Group for Improvement of Scenarios
AEG-TFK : AEG-Telefunken

AEM : Airports & Environment Management (Eurocontrol)
AENA : Aeropuertos Españoles y Navegatión Aérea (ES) / Spanish Airport and Air navigation Administration
AERA : Automated En-Route Air Traffic Control
AEREA : Association of European Research Establishments in Aeronautics

AEROSAT : Aeronautical Satellite Council

AES : Aircraft / Airborne Earth Station (ICAO - ADS)
AES : ATC Engineering Section
AES : Automatic Enhanced Surveillance
AEV : Annual Equivalent Value
AEW : Airborne Early Warning
AEWPD : Adapted EATM Work Programme Document
AF : Air Force

AF : Air France (airline)
AF : Audio Frequency (VCS)
AF : DME Arc to a Fix (ARINC 424 Path Terminator)

AFA : Association of Flight Attendants
AFAS : Aircraft in the Future ATM System
AFAST : Active Final Approach Spacing Tool
AFB : Air Force Base
AFC : Airport Facilities Control (ICAO)
AFC : ATC Frequency Change (service)

AFCAC : African Civil Aviation Commission
AFCNF : Air Force Central NOTAM Facility 
AFCS : Automatic Flight Control System

AFD : Airport Facility Directory
AFD : Associated Flight Details

AFDS : Autopilot Flight Director System (also A/P F/D)
AFFSC (E) : Air Forces Flight Safety Committee (Europe)
AFG : Advisory Financial Group (ex-FCG/Eurocontrol)

AFI : Africa-Indian Ocean Region (ICAO)
AFIL : Air Filed Flight Plan  
AFIS : Airport/Aerodrome Flight Information Service
AFISO : Aerodrome Flight information Service Officer

AFIZ : Aerodrome Flight information Zone
AFL : Actual Flight Level
AFL : Assigned Flight Level

AFM : Yes or Affirm or Affirmative or That is Correct

AFM : Airplane Flight Manual
AFMS : Advanced Flight Management System
AFMSG : Audit and Financial Matters Sub-Group
AFN : Air Traffic Services Facilities Notification

AFN: Airspace / Flow Management & Navigation Business Division (Eurocontrol)
AFP : Active Flight Plan Processing

AFP : Area Forecast Panel
AFP : ATC Flight Plan Proposal
AFPA : Automated Flight Plan to Track Association
AFPL : ADEXP Filed Flight Plan

AFRAA : African Airlines Association
AFS : Advanced Functional Simulator
AFS : Aeronautical Fixed Services

AFS : Automatic Flight System
AFSATCOM : Airborne Satellite Communication

AFT : After (time or place)

AFTN : Aeronautical Fixed Telecommunication Network

AFW : Area Flows Window

AFWA : Automatic Flight Weather Advisory
AGA : Aerodromes and Ground Aids
AGARD : Advisory Group on Aeronautical Research and Developments

AGAS : European Action Group for ATM Safety

AGATE :Advanced General Aviation Transport Experiments  
AGC : Automatic Gain Control (VCS)
AGCS : Air-Ground Communication System
AGCSG : Air/Ground Communication Sub-Group Meeting
AGDC : Air/Ground Data Communications
AGDC-SG : Air/Ground Data Communications Sub Group. See AGSG
AGDC-TF : Air/Ground Data Communications-TF (ODT)
AGDL : Air-Ground Data Link
AGDLS : Air-Ground Data Link System
AGL : Above Ground Level
AGLAE : Air-Ground Data Link Applications Experimentation

AGN : Again
AGN : Agenda
AGOD : Advisory Group on Deliverables
AGR : Agreement
AGSG : Air / Ground Data Communication Sub group
AGVC-SG : Air/Ground Voice Communication Sub Group
AHDG : Assigned Heading
AHEAD : Automation and Harmonisation of European Aeronautical Data
AHGSO : Ad Hoc Group of Senior Officials
AHMI : Airborne Human Machine Interface
AHRS : Attitude and Heading Reference System

AHS : American Helicopter Association
AI : Artificial Intelligence

AI : Air India (airline)

AIA : Aerospace Industries Association

AIAA : American Institute of Aeronautics and Astronautics

AIAA : Area of Intense Aerial Activity
AIB : Aeronautical Information Bulletin (EAD)
AIC : Aeronautical Information Circular
AICB : Air Initiated Comm-B Protocol
AICG : Ab Initio Co-ordination Group
AICG : ACAS Implementation Co-ordination Group
AICG : Airport Interface Co-ordination Group
AICM : Aeronautical Information Conceptual Model (EAD)
AID : Aid or Aircraft Identification
AIDA : Aeronautical Information and Data handling Austria
AIDC : ATS Interfacility Data Communications (ICAO)
AIDS : Aircraft Integrated Data System
AIG : ACAS Implementation Group ; Automatic Input Generation
AIG : Accident Investigation and Prevention
AIL : Aeronautical Item Location Bank

AIM : Airman’s Information Manual
AIM : ATFM Information Message  
AIM-FANS : Airbus Interoperable Modular FANS

AIMS : Airplane Information Management System (Boeing 777)
AIMS : Aircraft Integrated Monitoring (Information Management) System
AIP : Aeronautical Information Publication
AIPN : Appointing authority
AIR : Armament Initiative and Requirements
AIR 4653 : Aerospace Information Report 4653 - (Flight Management Systems Review)
AIR : Air Control
AIRAC : Aeronautical Information Regulation and Control
AIRCOM : Aircraft Communications
AIREP : Air-Report (ICAO)
AIRMET : Air Meteorological Information Report which may affect the safety of low-level aircraft operations
AIRPROX : The code word used in air traffic incident report to designate aircraft proximity (ICAO)

AIRS : Advanced Infrared Sounder
AIS : Aeronautical Information Services
AISAP : AIS Automation Specialist Panel
AISAS : Aeronautical Information Services Automated System
AISC : Aeronautical Mobile Communications System Panel
AISC : Aeronautical Industry Service Communication
AISG : AIS Automation Group
AISPOP : AIS Planning and Operations Subgroup
AISS : Aeronautical Information Server System 
AIS-TF : AIS Training Task Force
AISU : Aeronautical Information Service Unit
AITSC : Administrative IT Steering Committee
AIXM : Aeronautical Information Exchange Model
AKARD : Available Knowledge And required system Research and Development
AL : Aircraft Label
AL : Albania (ISO Country Code)
AL : Alerting Service

AL : Allegheny

ALA : Alighting Area
ALB : Alternative Label
ALCC : Airlift Central Co-ordination Centre
ALCE : Airlift Control Element
ALCM : Air Launched Cruise Missile
ALD : Airlift Division

ALERFA : Alert Phase
Alert : Alert phase

Alert Indicator : (visual or auditory) which provides information to the flightcrew in a timely manner about an event requiring pilot awareness.
ALIM : Altitude Limit (Positive RA Altitude Threshold)
ALLA : Allied Long Lines Agency
ALMC : Airlift Movement Cell
ALO : Air Force Liaison Officer

ALPA : Air Line Pilots Association

ALR : Alerting message

ALRS : Alerting Service
ALRT : Alert

ALS : Approach Lighting System
ALS : Architecture Layer Structure (ISO)
ALS : Automatic Line Switch (RMCDE)
ALS : Automatizovany Letisni System (CZ) / Automated Airport System

ALSTG : Altimeter Setting
ALT : Airborne Link Terminal

ALT :  Altitude

ALT : Alternate

ALTM : Altimerer

ALTN : Alternate Aerodrome

ALTNLY : Alternately

ALT HOLD : Altitude Hold Mode
ALTRV : Altitude Reservation System

AM : Aeromexico
AM : Airspace Management
AM : Amplitude Modulation
AM : Armenia (ISO Country Code)
AM : Arrival Manager
AM : Attribute Modification

AMA : Area Minimum Altitude
AMA : Airlift Management Agency
AMAN : Arrival Manager (APATSI)
AMC : Airspace Management Cell
AMC : ATC Microphone Check (service)

AMC : Avionics Maintenance Conference
AMC/CADF : Airspace Management Cell - ECAC Centralised Airspace Data Function
AMCP : Aeronautical Mobile Communication Panel (ICAO)
AMD : Administrative Management Domain

AMD : Advisory Map Display

AMD : Amend or Amended
AMD : Arrival manager Display
AMDP : Airspace Management Data Processing
AMDP-TF : EATCHIP Airspace Management Data Processing Task Force
AMDT : Amendment (ICAO)
AMDWP : Aeromedical Working Party
AME : ATM Message Exchange
AMEG : Air Miss Evaluation Group

AMGR : Airport Manager
AMHS : Aeronautical Message Handling Service

AMI : Airline Modifiable Information
AMI : Administrative and Management Information Software
AMID : Approach Multi-Input Device (ODID)
AMJ : Advisory Material Joint

AMLCD : Active Matrix Liquid Crystal Display
AML (WP) : Airfield Markings and Lighting (Working Party)
AMN : Airspace Management and Navigation (EATM Unit)
AMOC : ATFM Air Traffic Flow Management
AMOC : ATFM Modelling Capability

AMOS : Automatic Meteorological Observing System
AMOS : ARTAS Maintenance and Operational Support organisation

AMOSS : Airline Maintenance and Operation Support System
AMPS : American Mobile Phone System
AMS : Aeronautical Mobile Service
AMS : Airspace Management Service
AMS : ATC Model-Simulations Studies
AMS(R)S : Aeronautical Mobile Satellite (Route) Service  
AMSC : Allied Military Security Code
AMSL : Above Mean Sea Level
AMSS : Aeronautical Mobile Satellite Services
AMSS : Aeronautical Mobile Satellite System
AMSS : Automatic Message Switching System
AMSSP : Aeronautical Mobile Satellite Service Panel
AMT : ADS Mediterranean Trials
AMTI : Adaptive Moving Target Indicator
AN : Access Node (RMCDE)
ANA : Aeroportos e Navegaçao Aérea (PT)

ANA All Nippon Airways
ANA-EP : Aeroportos e Navegaçao Aérea Empresa Pública (PT)
ANC : Access Network Computer
ANC : Air Navigation Commission / Conference (ICAO)
ANCAT : Abatement of Nuisances Caused by Air Transport (ECAC environmental policy committee (ENV : AL)
ANDRA : Advanced Node for Data Relay in ATN
ANDS : ANS Department
ANERC : Advanced New En-Route Centre (UK)
ANM : ATFM Notification Message (CFMU / ECAC States)
ANOVA : Analysis of Variance

ANP : Actual Navigation Performance
ANP : Air Navigation Plan
ANPP : Air Navigation Plan Publication
ANS : Air Navigation Service

ANS : Answer
ANS/CR : Air Navigation Services of the Czech Republic
ANSA : International Advisory Group Air Navigation Services
ANSEP : Air Navigation Services Economics Panel (ICAO)

ANSI : American National Standards Institute

ANSIR : Advanced Navigation System Inertial Reference
ANSO : Air Navigation Services Offices (Irish aviation authority)
ANSP : Air Navigation Service Provider
ANT : Airspace and Navigation Team
AO : Aircraft Operator 
AO : Airlines Operator
AO : Arrival Operations
AO : ATM Operations
AOA : Aircraft Operating Agency (e.g. Airlines)

AOA : Angle-of-Attack

AOA : Airport Operations Area
AOB : Air Order of Battle
AOB : Angle of Bank
AOC : Advanced Operational Capability

AOC : Aerodrome Obstuction/Obstacle Chart
AOC : Aeronautical Operational Communications
AOC : Aircraft Operating Company
AOC : Aircraft Operations Centre (ICAO)
AOC : Airline Operation Control

AOC Aeronautical Operation Control (communications which support safety and regularity of flight that normally take place between aircraft and the operator)
AOC : Assume of Control (ODID)
AOC : Auxiliary Output Chip
AOC : Aeronautical Operational Control
AOC : Air Operator's Certificate

AOC : Airline Operational Communications

AOCC : Aircraft Operator Control Centre
AOCI : Airport Operators Council International
AOCP : Airborne Operational Computer Programme

AOCS Attitude and Orbit Control System

AOCU : Aircraft Operator Contol Unit

AOF : AIS Office (EAD)
AOF : Allocation of Functions

AOG : Aircraft On Ground
AOI : Aircraft Operations Information
AOI : Area of Operational Interest
AOI : AIS Office
AOIS : Aeronautical Operational Information System
AOM : Aircraft Operations Manual
AOP : Aeronautical OSI Profile
AOPA : Aircraft Owner and Pilot Associations
AOPG : Aerodrome Operations Group (ICAO)
AOPTF : Aerodrome Operations Task Force
AOR : Area of Responsibility
AOR : Atlantic Ocean Region (ICAO)
AOR-E : Atlantic Ocean Region - East (ICAO)
AORTF : ATM Added Functionality Operational Requirements Task Force
AOR-W : Atlantic Ocean Region - West (ICAO)
AOS : Airport Operations Strategy Drafting Group
AOT : Airport Operations Team
AOU : Aircraft Operator Unit 
AOWIR : Aircraft Operator What-If Re-routing
AOWP : Airport Operations Work Plan

AP : Airport
AP : Auto-Pilot
AP : Application Process

APA Allied Pilots Association
APANPIRG : Asia/Pacific Air Navigation Planning and Implementation Regional Group
APAPI : Abbreviated Precision Approach Path Indicator
APATSI : Airport / Air Traffic Systems Interface (ECAC)
APB : APATSI Project Board
APC : Aeronautical Passenger Communications / Correspondence
APC : Aeronautical Public Correspondence
APC : Assistant Planning Controller

APCH : Approach
APD : Activity Predictor Display
APDLC : Aircraft Proximity Data Link Communication (ICAO)
APDSG : ATM Procedures Development Sub-Group
APE : Analysis Programme for Evaluation
API : Application Programming Interface 
APIRG : Africa-Indian Ocean Planning and Implementation Regional Group (ICAO)
APL : Abbreviated Flight Plan 
APL : Applied Physics Laboratory
APL : ATC Flight Plan

APLGT : Airport Lighting
APM : Architecture Project Management
APMB : ACAS Programme Management Board

APMS Automated Performance Measurement System
APO : Airport Operator
APO : Aircraft Performance and Operations
APOD : Airport of Debarkation
APP : Approach Centre / Control (office/service)
APP controller/director : Approach controller/director
App. : Appendix
APPA-SG : ATFM Policies and Principles Advisory Sub-Group
APP-ASS : Approach-Assistant

APPR : Approach/Approach Mode

APR : Automatic Position Reporting

APRT : Airport

APRX : Approximate or Approximately

APS : Approach Control Surveillance
APSG : ACAS Programme Steering Group

APSG : After Passing
APT : Airport(s)
APT : Airspace Planning Team  became ANT (March 94)
APU : Auxiliary Power Unit

APV : Approve or Approved or Approval
APW : Area Proximity Warning
AQAP : Allied Quality Assurance Publication
AQG : Agency Quality Group
AQP : Advanced Qualification Programme
A-QPSK : Aviation Quadrature Phase Shift Keying
AR : Agency Representative (CIP)
AR : Air Route
AR : Automatic Reminder

AR : Argentina (ISO Country Code)
AR-1 : Approach Radar 1

ARAC Aviation Rulemaking Advisory Committee
ARB : Authoritative Representative Body
ARC 2000 : Automatic Radar Control for the 21st Century (CEE)
ARC : Airlift Requirement Centre
arc : assigned rate of climb/descent
ARC : Advanced Research for/in Air Traffic Control

ARC (ARCH) : CFMU – Archive System
ARCC : Air Rescue Co-ordination Centre
ARCH : Archives and Quality Control System 
ARCID : Aircraft Identification 
ARCOS : Arrival Co-ordination System 
ARCP : Air Refuelling Control Point
ARDEP : Analysis / Assessment of Research and Development in Eurocontrol Programmes
ARDRS : Automatic Radar Data Recording System
ARDS : ATM Architecture and overall system engineering
ARETA : ATM with RNAV in Extended Terminal Area
ARFA : Allied Radio Frequency Agency

ARFF : Airport Rescue and Fire Fighting

ARFOR : Area Forecast
ARH : Architecture
ARIBA : ATM system safety criticality Raised Issues in Balancing Actors Responsibility
ARINC : Aeronautical Radio Incorporated (a nonprofit corporation owned by member airlines to define form, fit and functions of avionics equipment)
ARINC 306 : Guidance For Designers Of Aircraft- Electronic Installations
ARINC 307 : Aircraft Integrated Data System Wire Bundle Provisions
ARINC 404A : Air Transport Equipment Cases And Racking
ARINC 406A : Airborne Electronic Equipment
ARINC 408A : Air Transport Indicator Cases And Mounting
ARINC 413A : Guidance For Aircraft Power Utilisation And Transient Protection
ARINC 414 : General Guidance For Equipment And Installation Engineers
ARINC 415 : Operation/Technical Guidelines On Failure Warning and Functional Test
ARINC 419 : Digital Data System Compendium
ARINC 421 : Guidance For Standard Subdivision of ATA Spec 100 Numbering System for Avionics
ARINC 422 : Guidance For Modification Status Indicators & Avionics Service Bulletins
ARINC 424 : Navigation System Data Base
ARINC 429 : Mark 33 Digital Information Transfer System
ARINC 528 : Airborne Tape Recorder
ARINC 533A : Airborne HF SSB/AM System
ARINC 541 : Airborne Magnetic Flight Data Recorder
ARINC 542 : Airborne Oscillograph Flight Data Recorder
ARINC 542A : Digital Flight Data Recorder
ARINC 551 : Airborne Glide Slope Receiver - Mark 2
ARINC 557 : Airborne Voice Recorder
ARINC 559A : Mark 2 Airborne HF SSB/AM System
ARINC 561 : Air Transport Inertial Navigation System - INS
ARINC 566 : Airborne VHF Communications Transceiver And Mark 1 VHF SATCOM System
ARINC 566A : Mark 3 VHF Communications Transceiver
ARINC 569 : Airborne Distance Measuring Equipment
ARINC 569 : Heading and Altitude Sensor (HAS)
ARINC 571 : Inertial Reference System (INS)
ARINC 572 : Mark 2 Air Traffic Control Transponder
ARINC 573 : Aircraft Integrated Data System (AIDS) Mark 2
ARINC 574 : Passenger Announcement, Entertainment & Service Multiplex System
ARINC 575 : Mark 3 Subsonic Air Data System (Digital)
ARINC 576 : Mark 4 Subsonic Air Data System
ARINC 577 : Audible Warning System
ARINC 578 : Airborne ILS Receiver
ARINC 579 : Airborne VOR Receiver
ARINC 585 : Electronic Chronometer System
ARINC 591 : Quick Access Recorder For Aids System (OAR)
ARINC 592 : Airborne Passenger Tape Record
ARINC 594 : Ground Proximity Warning System (GPWS)
ARINC 595 : Barometric Altitude Rate Computer
ARINC 596 : Mark 2 Airborne SELCAL System
ARINC 597 : Aircraft Communications Addressing And Reporting System (ACARS)
ARINC 597A : Enhanced ACARS Avionics
ARINC 59MA : Airborne Announcement Tape Reproducer
ARINC 600 : Air Transport Avionics Equipment Interfaces
ARINC 601 : Control/Display Interfaces
ARINC 602 : Test Equipment Guidance
ARINC 602A : Test Equipment Guidance
ARINC 603 : Airborne Computer Data Loader
ARINC 604 : Guidance For Design And Use Of built-In Test Equipment (BITE)
ARINC 605 : Users Guide For ARINC 616 Avionics Subset Of ATLAS Language
ARINC 606 : Guidance For Electrostatic Sensitive Device Utilisation & Protection, Sup. 1
ARINC 608 : Standard Modular Avionics Repair And Test System (SMART)
ARINC 609 : Design Guidance For Aircraft Electrical Power Systems
ARINC 610 : Guidance For Design and Integration of Aircraft Avionics Equipment In Simulators, Supplement 1
ARINC 611 : Guidance For The Design and Installation Of Fuel Quantity Systems, Sup. 1
ARINC 612 : BITE Glossary
ARINC 613 : Guidance for Using the Ada Programming Language in Avionics Systems
ARINC 614 : Standard Firmware Loader For Avionics Shops
ARINC 615 : Airborne Computer High Speed Data Loader, Supplement 3
ARINC 616 : Avionics Subset of ATLAS Language
ARINC 620 : Data Link Ground System Standard And Interface Specification

ARINC 622-1 : The ACARS Convergence Process
ARINC 624 : Design Guidance For Onboard Maintenance System
ARINC 626 : Standard ATLAS For Modular Test
ARINC 627 : Programmers Guide For Smart Systems Using ARINC 626 ATLAS
ARINC 629 : Multi Tester Data Bus : Part 1 - Technical Description
ARINC 629 : Multi-Transmitter Data Bus
ARINC 631 : Aviation Packet Communications Functional Description
ARINC 651 : Design Guidance For Integrated Modular Electronics
ARINC 659 : Backplane Data Bus for Integrated Modular Avionics
ARINC 701 : Flight Control Computer System
ARINC 702 : Flight Management Computer, Supplement 4 & 5
ARINC 703 : Thrust Control Computer
ARINC 704 : Inertial Reference System, Supplement 6
ARINC 705 : Altitude and Heading Reference System (AHRS)
ARINC 706 : Subsonic Air Data System
ARINC 707 : Radio Altimeter, Supplement 6
ARINC 708 : Airborne Weather Radar
ARINC 709 : Airborne Distance Measuring Equipment, Supplement 8
ARINC 709A : Precision Airborne Distance Measuring Equipment
ARINC 710  : Mark 2 Airborne ILS Receiver
ARINC 711 : Mark 2 Airborne VOR Receiver
ARINC 714 : Mark 3 Airborne SELCAL Systems
ARINC 715 : Airborne Passenger Address Amplifier
ARINC 716 : Airborne VHF Communications Transceiver
ARINC 717 : Flight Data Acquisition And Recording System
ARINC 718 : Mark 3 ATC Transponder
ARINC 719 : Airborne HF/SSB System
ARINC 720 : Digital Frequency/Function Selection for Airborne
ARINC 722 : Electronic Equipment Protection Video System
ARINC 723 : Ground Proximity Warning System (GPWS)
ARINC 724 : Mark 2 Aircraft Communications
ARINC 724A : Mark 2 ACARS Avionics
ARINC 724B : Aircraft Communications Addressing and Reporting System (ACARS)
ARINC 725 : Electronic Flight Instruments (EFIS)
ARINC 726 : Flight Warning Computer System
ARINC 727 : Airborne Microwave Landing System
ARINC 728 : Avionics Refrigeration and Cooling System (ARCS)
ARINC 729 : Analog And Discrete Data Converter System
ARINC 730 : Airborne Separator Assurance System
ARINC 731 : Electronic Chronometer
ARINC 732 : Mark 2 Airborne Passenger Audio Entertainment Tape Reproducer, Supplement 1
ARINC 735 : Traffic Alert and Collision Avoidance System (TCAS), Supplement 1
ARINC 737 : On Board Weight and Balance System. Supplement 1
ARINC 738 : Air Data and Inertial Reference System (ADIRS)
ARINC 739 : Multi-Purpose Control and Display Unit
ARINC 740 : Multiple-Input Cockpit Printer
ARINC 7411P2 : Aviation Satellite Communication System : Part 2 - Satellite Design
ARINC 741P1 : Aviation Satellite Communication System : Part I- Aircraft Installation Provisions
ARINC 741P4 : Aviation Satellite Communications System : Part 4 - Specification and Description Language
ARINC 742 : Design Guidance For Windshear Warning and Guidance Equipment
ARINC 743 : Airborne Global Positioning System Receiver
ARINC 743A : GPS/GLONASS Sensor
ARINC 744 : Full Format Printer
ARINC 745 : Automatic Dependent Surveillance, Supplement 1
ARINC 746 : Cabin Communications System, Supplement 1
ARINC 747 : Flight Data Recorder
ARINC 748 : Communications Management Unit (CMU)
ARINC 750 : VHF Data Radio (VDR)
ARINC 751 : Gate-Aircraft Terminal Environment Link (Gatelink) - Aircraft Side
ARINC 752 : TFTS Airborne Radio Sub-System
ARINC 753 : HF Data Link System
ARINC 757 : Cockpit Voice Recorder (CVR)
ARINC539A : Airborne 400 Hz AC Tape Reproducer
ARLO : Air Liaison Officer
ARM : ADS Report Message
ARM : Air Request Message
ARM : Anti Radiation Missile
ARM : Armenia
ARMATS : State Closed Joint-Stock Company of Armenian Air Traffic Services
ARN : ATS Routes and Associated Navigation Means
ARN-1 (Table) : Basic ATS Route Network in the Lower and Upper Airspace
ARN-2 (Table) : Radio Navigation Aids Associated with the Basic ATS Route Network Terminal Area and Instrument Approach Procedures
ARN-V2 : ATS Route Network - Version 2 (ECAC, EATM)
ARN-V3 : ATS Route Network - Version 3 (ECAC, EATM)

ARNG : Arrange
ARO : Air Traffic Service Reporting Office
ARP : Aerodrome Reference Point

ARP :  Aerospace Recommended Practice
ARP : Automated Route Planning
ARPA : Advanced Research Project Agency

ARPL : ADEXP Format Repetitive Flight Plans Message

ARQ : Automatic error Correction
ARQ : Automatic Request Repeat

ARQ : Automatic Response to Query
ARR : Arrive or Arrival or Arrival Message
ARR SP : Arrival Sequence Planner
ARS : Aeronautical Radio Navigation Service
ARS : Avoidance Routing Scheme

ARS : Special air-report (message type designator)

ARSA : Airport Radar Serve Area
ARSC : Air Rescue Sub Centre
ARSR : Air Route Surveillance Radar

ARST :Arresting (specify (part of) aircraft arresting equipment)
ART : Analysis and Replay Tool
ARTAS : Air Traffic Management Surveillance Tracker and Server System
ARTAS TF : ARTAS Task Force
ARTCC : Air Route Traffic Control Centre
Artemis : An ESA experimental telecommunications satellite hosting an EGNOS navigation transponder
ARTES-9 : Advanced Research in Telecommunication Systems
ARTS : Area Radar Training Squadron 
ARTS : Automated Radar Terminal System

ARU : Archive to UNIX
ARU : Airspace Reservation Unit
AS : Airspeed
AS : Airspace

AS : Altostratus
AS, A-S : Anti-Spoofing
ASA : Aircraft Situation Awareness
ASA : Automated Support to ATC
ASA : Automatic Slot Assignment
ASA System : Automatic Slot Assignment System
ASAP : Aircraft Separation Assurance Programme
ASAP : As soon as possible / practicable
ASARS : Air Surveillance Airborne Radar System
ASAS : Airborne Separation Assurance System
ASC : Ascend to or Ascending to
ASCAP : Automatic SSR Code Assignment Procedure
ASCB : Avionics Standard Communication Bus
ASCII : American Standard Code for Information Interchange / Exchange
ASCOT : Airport Slots Compliance Tools
ASDA : Accelerated Stop Distance Available
ASDAR : Aircraft to Satellite Data Relay

ASD : CFMU/ENGD - Architecture & System Design Section
ASDE : Airport Surface Detection Equipment
ASD-TF : Air Situation Display Task Force
ASE : Altimetry System Error
ASE : Application Service Element
ASECNA : Agency for the Safety of Air Navigation in Africa and Madagascar
ASEP : ACCS Surveillance Exploratory Prototype (NATO / SHAPE)
ASHTAM : NOTAM relating to volcanic and/or dust activity (ICAO)
ASI : Aerospace Sciences Inc.
ASI : Asia Region (ICAO)

ASI Air Speed Indicator

ASIC : Application-Specific Integrated Circuit
ASM : Ad-hoc Schedule Message
ASM : AirSpace Management
ASMAC : Automated System for Management of Aeronautical Information and Charting
ASMC : Airspace Management Communications
ASMGCS : Advanced Surface Movement Guidance and Control Systems
ASMI : Airport Surface Movement Indicator
ASMT : ATM Safety Monitoring Tool

ASMTF : Airspace Management Task Force
ASN : Abstract Syntax Notation
ASN 1 : Abstract Syntax Notation One
ASNO : Approach Sequence Number
ASO : Air Surveillance Officer
ASOC : Air Sovereignty Operations Centre
ASOC : Army Support Operations Centre
ASOP : Airspace Organisation and Procedures

ASOS : Automatic Surface Observing System
ASP : Adjustable System Parameter 
ASP : Aeronautical Fixed Service Systems Planning for Data Interchange Panel
ASP : Air Space
ASP : AIRCOM Service Processor (SITA)
ASP : Arrival Sequence Planner
asp : assigned speed

ASPH : Asphalt
ASPP : Aeronautical Fixed Service Systems Planning for Data Interchange Panel
ASQF : Application Specific Qualification Facility (part of EGNOS)
ASR : Airport Surveillance Radar (TAR)

ASR : Altimeter Setting Region
ASRS : Aviation Safety Reporting System
ASRT : Air Support Radar Team
ASSR : Assigned SSR code (FPPS/DECADE)
ASTA : Airport Surface Traffic Automation
ASTER : Aviation Safety Targets for Effective Regulation
ASTERIX : All-purpose Structured Eurocontrol Radar Information Exchange.
ASTP : ADS Studies and Trials Project
ASW : Anti Submarine Warfare
ASW : Air Situation Window

AT At (an altitude)
AT : Actual Time Count Down
AT : Air Transport
AT : At Time

AT…: At (following by time at which weather change is foecast to occur)
AT : Austria (ISO Country Code)

AT : Royal Air Maroc (airline)
ATA : Actual Time of Arrival
ATA : Air Transport Association (of America)
ATAC : Airspace Traffic Data Capture
ATAF : Allied Tactical Air Force

ATAFF : Air Traffic Arbitrated Free Flight
ATAG : Air Transport Action Group
ATAR : Automatic Air Reporting
ATARS : Automatic Traffic Avoidance and Resolution System
ATAS : Air Traffic Advisory Service
ATC : Air Traffic Control

ATCA : Air Traffic Control Association (US)
ATCA : Allied Tactical Communications Agency
ATCA : Air Traffic Control Assistant
ATCAP : Air Traffic Control Automation Panel (ICAO)
ATCAS : (Sweden) ATC Automated System
ATCC : Air Traffic Control Centre
ATCC : Air Traffic Control Clearance

ATCCC : Air Traffic Contol Command Centre
ATCEUC : Air Traffic Controllers European Unions Co-ordination
ATCgram : Illustration in graph form of the main functional levels of ATC systems
ATC-HMI : Air Traffic Control Human Machine Interface
ATCI : Airport ATC and Information systems
ATCO : Air Traffic Controller or Air Traffic Control Officer

ATCRBS : Air Traffic Control Radar Beacon System
ATCRU : Air Traffic Control Radar Unit
ATCS : Air Traffic Control Service

ATCS Advanced Train Control Systems

ATCSCC Air Traffic Control System Command Center

ATCSQ : ATC Safety Questionnaire

ATCT : Airport Traffic Control Tower
ATCU : Air Traffic Control Unit
ATD : Actual Time of Departure
ATD : Along Track Distance
ATDS : Airborne Tactical Data System
ATE : Automatic Test Equipment
ATFC : Air Traffic Flow Controller
ATFM : Air Traffic Flow Management

ATFM : CFMU/DEVD - ATFM Application Section
ATFMC : Air Traffic Flow Management Communications
ATFMO : Air Traffic Flow Management Organisation
ATFMP : Air Traffic Flow Management Position 
ATFMS : Air Traffic Flow Management System
ATFMU : Air Traffic Flow Management Unit
ATFR : Air Traffic Flow Regulator
ATG : Air Traffic Generator

ATHR Autothrust System

ATI : Automatic Tracking Initiation
ATIC : Administrative and Technical Inspection Committee (Agency structure)

ATIF : ATN Trials Infrastructure
ATILO : Administrative Tribunal of the International Labour Organisation

ATIS : Automatic Terminal Information Service
ATLAS : Air Traffic Land and Air Study [or Airborne Systems] (European Commission)

Atm : Tyre Pressure (KG/cm3)
ATM : Air Traffic Management

ATM : Air Transportation Management
ATM : Asynchronous Transfer Mode
ATM 2000+ : Eurocontrol ATM Strategy for the Years 2000+
ATMAS : Air Traffic Management Automated System (It. ATFM)
ATMC : Air Traffic Management Centre
ATMCP : ATM Operational Concept Panel (ICAO)
ATMCT : Air Terminal Movement Control Team Centre (NATS UK)
ATMG : Air Traffic Management Group
ATMO : Air Traffic Management Organisation
ATMOS : Air Traffic Management Operating System
ATMS : Advanced Air Traffic Management System
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)

ATN EURET : see EURATN
ATN RD : Aeronautical Telecommunication Network Routing Domain
ATN RDC : Aeronautical Telecommunication Network Routing Domain Confederation
ATNC : ATN and Communication Architecture
ATNI : Aeronautical Telecommunication Network Internet
ATNP : Aeronautical Telecommunication Network Panel (ICAO)
ATNSI : ATN System Inc. (US)
ATO : Actual Time Overhead of Overflying (CFMU - CASA)
ATO : Airborne Traffic Observation
ATOC : Allied Tactical Operations Centre
ATOPS : Advanced Transport Operating System
ATOT : Actual Take Off Time

ATP : At…(time or place)
ATRAC : Air Navigation Services Employee Training Concept
ATRACC : ATC System for Riga Area Control Centre
ATRK : Alone Track Error
ATS : Air Traffic Services

ATS : Automatic Throttle System

ATSA : Air traffic Services Authority (Bulgaria &Croatia)

AT-SAT : Air Traffic Selection and Training  
ATSD : Air Traffic Situation Display

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)

ATSEP : Air Traffic Safety Electronics Personnel
ATSIS : Air Traffic Services Investigation System
ATSN : Air Traffic Service Network
ATSO : Air Traffic Services Operator
ATSORA : Air Traffic Services Outside Regulated Airspace
ATSP : Air Traffic Service Providers
ATSSD : ATS Standards Department
ATSU : Air Traffic Service Unit
ATSup : Air Traffic Supervisor
ATT : Along Track Tolerance
ATT : Attitude Indicator

ATTN : Attention
ATWR : Apron TWR

ATYP :  Aircraft Type
ATZ : Aerodrome Traffic Zone
AU : Arbitrary Unit

AU : Australia (ISO Country Code)

AUA : ATC Unit Airspace
Aud : Audio aids
AUP : Airspace Use Plan
AUS : Airspace Utilisation Service
AUSTRO CONTROL : Österreichische Gesellschaft für Zivilluftfahrt mbH (AT)

AUTH : Authority

AUTH : Autorized or Authorization

AUTOB : Automatic Weather Reporting System
AUTOCAD : Automatic Computer Aided Design
AutoNav : Auto-Navigation
AUTOVON : Automatic Voice Network

AUW : All Up Weight

AUX : Auxilliary
AV : Audio-visual aids

AV : Avianca

AVAIL : Available

AVBL : Available

A-VASIS : Advanced Visual Approach Slope Indicator System
AVENUE : ATM Validation Environment for Use towards EATMS

AVG : Average

AVGAS : Aviation Gasoline

AVHRR Advanced Very High-Resolution Radiometer

AVI : Audio/Video Interleaved
AVOL : Aerodrome Visibility Operational Level
AVPAC : Aviation VHF Packet Communications
AW : Area Width
AW : Aerial Work
AW/P : Active Way Point
AWACS : Airborne Warning and Control System

AWAS Automated Weather Advisory Station

AWIPS Advanced Weather Interactive Processing System

AWIR : Automatically generated What-If Re-routing
AWOG : All Weather Operations Group
AWOP : All Weather Operations Panel (ICAO)
AWOS : Automatic Weather Observing System
AWP : Ancillary Working Position
AWP : Arrival Waypoint

AWR/Rn : Alternative flight plan on the basis of the Aircraft Operator „What-If“ Re-route Function (AOWIR), whereby „n“ designates the current number of the AOWIR alternative flight plan

AWTA : Advise at What Time Table
AWX : All Weather
AWY : Airway

AY : Finnair (airline)
AZ : Aerodrome zone

AZ : Alitalia (airline)
AZ : Azerbaijan (ISO countries Codes)

AZM : Azimuth

 

-B-

B : At or Below (constrained altitude)

B : Belgium

B : Blue
B&D : Bearing and Distance
B&H : Bosnia and Herzegovina
B/C : Benefit / Cost
B/CRS : Back Course
BA  : Barometric Altitude
BA : Bosnia and Herzegovina (ISO Country Code)

BA : Breaking Action

BA : British Airways (airline)
BAA : British Airport Authority
BADA : Base of Aircraft Data ; Aircraft performance Data Base
BAF : Belgian Air Force

BA FAIR : Braking action Fair

BALPA British Air Line Pilots Association

BA NIL : Braking Action Nil

BA POOR : Braking Action Poor
BARS : Behaviour Anchored Rating Scales
BARTCC : Berlin Air Route Traffic Control Centre

BASE : Cloud Base
Base AM : Base Arrival Manager
Base AMD : Base Arrival Manager Display

BASIS British Airways Safety Information System
BAST : Basic ATC Skills Trainer
BATAP : `Type-B' Application To Application Protocol
BAZ : Bundesamt für Zivilluftfahrt (Austria) (AT) / Austrian aviation authority

BC : Patches (meteo)

BC : Back Course
BCA : Border Crossing Authority
B-CAS : Beacon Collision Avoidance System
BCBP : Bilateral Communication Plan Co-ordination
BCD : Binary-Coded Decimal

BCFG : Fog Patches

BCMT : Beginning of Civil morning twilight

BCN : Beacon

BCST : Broadcast
Bd : Baud

BD : British Midland (airline)
BDP : Brussels ACC Computer
BDR : Battle Damage Repair

BDRY : Boundary
BE : Belgium (ISO Country Code)

BECMG : Becoming (meteo)
BEM : Boundary Estimate Message (SARP)
BENELUX : Belgium, Netherlands and Luxembourg
BER : Bite Error Rate

BERM : Snowbank(s) Containing Earth/Gravel

BF MarkAir

BFD : Basic Flight Data message
BFL : Blocked Flight Level Area

BFR : Before
BFWG : Budgetary and Financial Working Group
BG : Bulgaria (ISO Country Code)
BGD : Background
BHL-System : (Name of HR-registration system)
BIAC : Brussels International Airport Company
BIF : Deliver Implementation Benefits Faster (EATCHIP Adaptation)
BIRDTAM : NOTAM on Bird Activity
BIS : Boundary Intermediate System
BIST : Build-In Self Test 
BIT : Built-In Test
BITE : Built-In Test Equipment

BKN : Broken (meteo)

BL : Blowing (meteo)

BLDG : Building

BLO : Below clouds

BLW : Below

BMUN : Better Meet User Needs (EATCHIP Adaptation)
BN : Backbone Node (RMCDE/ RADNET)
BNC : Backbone Network Computer

BND : Bound
BNF : Backus Naur Form
BNL : Benelux
BOI : Biographical Oriented Interview

BOMB : Bombing
BOS : Behaviour anchored Rating Scales
BP : Business Plan
BPF : Band Pass Filter
BPN : Boundary Point of Entry
bps : bits per second
BPS : Boundary Point Sector
BPSK : Binary Phase Shift Keying
BPSX : Boundary Point Sector Exit

BR : Mist (meteo)

BR : Brazil (ISO Country Code)

BR : Eva Air (airline)
BRA : Basic Rate Access
BRA : Bearing, Range and Altitude

BRF : Short (used to indicate the type of approach desired or required)

BRG : Bearing
BRITE : Basic Research in Industrial Technologies for Europe = EURAM
B-RNAV : Basic Area Navigation

BRNAV : Basic Air NAVair Traffic Control Unit

BRKG : Braking

BRT Brightness
BS : Band Stop (ACS)
BS : BootStrap (RADNET Introduction - MAS)

BS : Commercial Broadcasting station
BSC : Binary Synchronous Communications 
BSP : Aircraft Parameter Downlink (service)
BSS : Best Signal Selection 
BSU : Beam Steering Unit
BTC : Basic Training Course
BTEC : Business and Technician Education Council
BTH (R) : Beyond the Horizon (Radar)

BTL : Between Layers

BTN : Between
BVR : Beyond Visual Range
BW : Bandwidth
BWP : Budget and Work Programme Planning
BY : Belarus (ISO countries Codes)

BYD : Beyond

-C-

C : Centre (runway indentification)

C : Degree Celcius

C/A Code : Course / Acquisition Code
C/d : Capacity demand ratio
C/M : Carrier-to Multi-Path Ratio
C/N : Carrier-to-Noise Ratio
C/N0 : Carrier-to-Noise-Density Ratio
C/S : Call Sign
C102 (TSO) : Helicopter Radar Approach, Issued 04/02/84 (RTCA DO-172, Issued 03/83)
C104(TSO) : Microwave Landing System (MLS) Receiving Equipment, Issued 06/82 (RTCA DO-174, Issued 03/82)
C105(TSO) : Optional Display For Weather Radar, Issued 06/84 (RTCA DO-174, Issued 03/81)
C110(TSO) : Airborne Thunderstorm Detector, Issued 01/01/01,(RTCA DO-187, Issued 11/84
C115(TSO) : RNAV Equipment Using Multi-Sensor, Issued 06/86 (RTCA DO-187, Issued 11/84)
C118(TSO) : Airborne TCAS I Equipmen4 Issued 08/88 (RTCA DO-197, Issued 3/87)
C119(TSO) : Airborne TCAS II Equipment (RTCA Do-185, Issued 09/83)
C120(TSO) : RNAV Equipment Using OMEGA/VLF, Issued 01/88 (RTCA DO-185 issued 9/83)
C2 level : Security level in the United States Department of Defense
C31d(TSO) : High Frequency (HF) Communications Transmitting Equipment, Issued 04/84 (RTCA DO-163, Issued 03/76)
C32d(TSO) : High Frequency (HF) Communications Receiving Equipment, Issued /83
C34e(TSO) : ILS Glide Slope Receive Equipment, Issued 01/88 (RCTA DO-192, Issued 07/86)
C35d(TSO) : Radio Marker Receiving Equipment, Issued 04/71 (RTCA DO-143, Issued 01/70)
C36e(TSO) : ILS Localizer Receiver Equipment, Issued 01/88 (RTCA) DO-195, Issued 11/86)
C37d(TSO) : VHF Comm transmitting Equipment, Issued 08181 (RTCA DO-157, Issued 08/81 (RTCA DO-157, Issued 08/74)
C38c(TSO) : VHF Comm Receiving Equipment; Issued 08/81 (RTCA DO-156, Issued 08/74)
C38d(TSO) : VHF Comm: Receiving Equipment, Issued 08/81 (RTCA DO-186, Issued 1/84)
C3CM(TSO) : Command, Control and Communications Countermeasures
C3T : Controller Tools and Transition Trials. See EVP.
C40c(TSO) : Airborne VOR Receiving Equipment, Issued 01/88 (RTCA DO-1996, Issued 11/86)
C41d(TSO) : Airborne ADF Equipment, Issued 05/86 (RTCA DO-179, Issued 05/82)
C50c(TSO) : Audio Selector Panel and Amps, Issued 01/83 (RTCA DO-170, Issued 01/80)
C57a(TSO) : Headsets And Speakers, Issued 01/83 (RTCA DO-170, Issued 01/80)
C58a : Aircraft Microphones, Issued 01/83 (RTCA DO-170, Issued 01/80)
C59 : Selective Calling (SELCAL) Equipment, Issued 01/01 (RTCA DO-93, Issued 2/59)
C60b : RNAV Equipment Using LORAN -C, Issued 05/88 (RTCA DO-194, Issued 11/86)
C63c : Airborne Weather Radar, Issued 08/83 (RTCA DO-173 Issued 11/80)
C65a : Doppler Radar Air Speed Equipment, Issued 08/83 (RTCA DO-158, Issued 11/75)
C66b : Airborne DME (Distance Measuring Equipment), Issued 08/81 (RTCA DO-1514, Issued 04/60)
C67 : Airborne Radar Altimeters, Issued 11/64 (RTCA DO-103, Issued 4/60)
C68a : Dead Reckoning Computer Equipment, Issued 08/83 (RTCA DO-158, Issued 10/75)
C74e : Airborne ATC Transponder Equipment, Issued 01/01 (RTCA DO 161A, Issued 05/76)
C87a : Low Range Radar Altimeters, Issued 01/01 (RTCA DO-155, Issued 01/74)
C91a : Emergency Locator Transmitter, Issued 04/85 (RTCA DO-183, Issued 5/83)
C92b : Ground Proximity Warning (GPWS) Equipment, 01/01 (RTCA DO-161A, Issued 05/76)
C94a : OMEGA Receiving Equipment, Issued 08/81 (RTCA DO-164A, Issued 09/79)

C : Centigrade

CA : Canada (ISO Country Code)
CA : Civil Aviation
CA : Conflict Alert
CA : Course to an Altitude (ARINC 424 Path Terminator)
CAA : Civil Aviation Authority (Great Britain)

CAAC : Civil Aviation Authority of China

CAAS : Class A Airspace
CAAS : Computer Aided Approach Sequencing

CAB : Civil Aeronautics Board
CAC : Centralised Approach Control
CAD : Computer Aided / Assisted Design
CADAS : Computer Controlled Avionics Data Acquisition System
CADF : Centralised Airspace Data Function (ECAC)
CADIN : Czech Automated Data Interchange Network
CADS : Combined Arrival and Departure Sequencing/Study (APATSI)
CADS : Computer aided Departure System
CAE : Computer Aided Engineering
CAEP : Committee on Aviation [Environmental] Protection Emissions Operational (Measures Working Group, WG/4) ; Commission on Aviation Environmental Protection (ICAO)
CAERAF : Common American-European Reference ATN Facility

CAI : Civil Aviation Inspection
CAI : Computer Assisted Input
CAIIS : Computer Aided Imagery Interpretation System
CAIR : Confidential Aviation Incident Reporting
CAIRDE : Civil Aviation Integrated Radar Display Equipment (IRE)
CAL : Computer Aided Learning
CALLSGN : Callsign
CALM : Computer Assisted Landing Management System
CALS : Computer-aided Acquisition and Logistic Support
CAM : Computer Aided Manufacturing
CAM : Conflict Alert Message
CAMI : Civil Aeromedical Institute
CAMOS : Central ARTAS Maintenance & Operational Support
CAMPS : Computer Aided Message Processing System
CAMUS : Czech Automated Multi radar System
CAN Proj. : Croatian Air Navigation Project
CANAC : Computer Assisted National ATC Centre (B)
CANSO : Civil Air Navigation Services Organisation
CAO : Computer Assisted Operations
CAOFA : Co-ordination of Air Operations in the Forward Area
CAP : Combat Air Patrol
CAP : Controller Access Parameters
CAPAN : Capacity Analyser
CAPC : Civil Aviation Planning Committee 
CAPE : Computer Assisted Planning Experiment

CAPP : CFMU/DEVD - Client Applications Section
CAPSIN : CAA Packet Switched Integrated Network (UK)
CAR : Caribbean Region
CARAT : Computer-Aided (Assited) Route Allocation Tool
CARD : CNS Applications - Research and Development
CARD : Conflict And Risk Display (ODID)
CARE : Co-operative Actions of ATM Research and Development in Eurocontrol
CARFE : Conference on Airport and Route Facility Economics (ICAO)
CART : Classification And Regression Trees
CAS : Calibrated (Computed) Air Speed
CAS : Close Air Support
CAS : Collision Avoidance System
CAS : Computerised Assessment System
CASA : Computer Assisted Slot Allocation 
CASE : Computer Aided Software Engineering
CASI : CFMU Aircraft Situation Image
CASOR : Civil Area Services Operations Room
CAST : Consequences of future ATM systems for air traffic controller Selection and Training
CASTA : Controller Associate for Strategic and Technical Advice
CAT x : Category x Precision Approach (I, II of III)

CAT I Facility providing operation down to 200 feet decision height and runway visual range not less than 2600 feet.

CAT II Facility providing operation down to 100 feet decision height and runway visual range not less than 1200 feet.

CAT II a Facility providing operation with no decision height limit to and along the surface of the runway with external visual reference during final phase of landing and with a runway visual range not less than 700 feet.

Cat : Category
CAT : Clear Air Turbulence

CAT : Computer Aided Testing

CAT : Commercial Air Transport
CAT : Computer Assisted Teaching / Training
CAT : Continuous Attention Task
CATCAS : Copenhagen Air Traffic Control Automated System (DK)
CATCO : Chief ATC Operations
CATIA : TF on CNS/ATM Implementation Aspects
CATSA : Croatian air Traffic Services Authority
CATSIM : CAA Air Traffic Simulator (UK)
C-ATSU : Controlling ATS Unit
CAUTRA : Automated Computer System for Air Traffic

CAVOK : Clouds and Visibility OK (Visibility, cloud and presend weather better than prescribed values or conditions)
CB : Central Battery

CB : Suckling Airways (airline)
CB : Cumulonimbus (meteo)
CBA : Cost Benefit Analysis
CBA : Cross Border Area

CBAS : Class B Airspace

CBSA : Class B Surface Area
C-Band : Frequency Band
CBI : Computer Based Instruction
CBN : Common Backbone Network (subnetwork RAPNET = system of the national ATS, DFS = PSN)
CBPM : Computer-Based Performance Measure
CBS : Cost/Benefit Studies
CBT : Computer Based Tool
CBT : Computer Based Training

CC : Contractual Conditions

CC : Cirrocumulus

CCA : (or CCB, CCC..etc..in sequence) corrected meteorological message (message type designator)

CCAS : Class C Airspace
CCB : Change Control Board
CCC : Cellular CNS Concept
CCC : Central Computer Complex
CCC : Command, Control and Communications
CCC : Common Core Content (of ATC Training)
CCCC : Cross Channel Co-ordination Centre
CCCI, C3I : Command, Control, Communications and Intelligence (network)
CCDS : Code Callsign Distribution System
CCF : Centralised Control Function (LATCC)
CCFT : Cold Cathode Fluorescent Tube
CCG : CEATS Co-ordination Group
C-Channel : Circuit Mode Channel
CCIP : Code-Callsign Input Position 
CCIS : Closed Circuit Information System
CCL : Code Callsign List

CCLKWS : Counterclockwise
CCM : Computerized Control and Monitoring
CCMS : Committee on the Challenges of Modern Society 
CCP : Circuit Switched Public Data Network
CCP : Configuration Control Plan
CCR : Cancel Contract Request
CCS : Code CallSign

CCSA : Class C Surface Area
CCTV : Closed Circuit TeleVision
CCW : Counter-Clockwise

CD : Candela
CD : Conflict Display (ODID)
CD : Council Directive
CD : Course to a DME Distance (ARINC 424 Path Terminator)
CD&A : Conflict Detection and Avoidance
CD2 : Common Digitizer 2
CD-2 : Transmission format for radar data
CDA : Client Defined Area 
CDA : Conflict Display Area. Coordination Approval / CoorDination Acceptance (message)
CDA : Current Data Authority (ICAO)
CDB : Central Data Base
CDG : Roissy Charles-de-Gaulle Airport
CDI : Coordination Information
CDI : Course Deviation Indicator
CDM : Collaborate (Cooperative) Decision Making (central supporting features of gate to gate, and for enhancing capacity [airports])

CDMA : Code Division Multiple Access
CDN : Airspace Crossing Co-ordination Message / Co-ordination (message type designator)
CDP : Central Data Processing
CDP : Computer Diagnostics Program
CDPS : Central Data Processing System

CDR : Coded Departure Routes. Predefined routes used to route air traffic around areas of severe weather.
CDR : Conditional Route
CDR : Conflict Detection and Resolution
CDR : Co-ordination Request (message)
CDR : Critical Design Review
CDRL : Contracts Data Requirements List (MAS/DFS - ODS)
CD-ROM : Compact Disk / Read Only Memory
CDS : Controller Display Support
CDSEPT : Committee to Develop Standards for Educational and Psychological Testing of The American Educational research Association, The American Psychological Association, and The National Council on Measurement in Education.
CDT : Command Delivery Time
CDTI : Cockpit Display of Traffic Information
CDTS : Console Detailed Technical Specification
CDU : Control and Display Unit (pilots' interface to the FMS)
CE : Committee of Management  
CE : European Commission / Commission européenne
CEAC : Committee for European Airspace Co-ordination (NATO Group) renamed on 27.4.98 by the North Atlantic Council (=NATMC)

CEAS : Class E Airspace
CEATS : Central European Air Traffic Services (Austria, Croatia, Czech Republik, Hungary, Italy, Slovakia and Slovenia [Bosnia, Herzegowina])
CEATS LSG : Central European Air Traffic Services Legal Sub Group
CEATS UAC : Central European Air Traffic Services Upper Airspace Control Centre
CEC : Commission of the European Communities ; European Commission / Commission des Communautés Européennes (=CEE) ; Commission européenne
CEECs : Countries of Central and Eastern Europe ; Central and Eastern Europe Countries
CEF : Capacity Enhancement Function
CEFA : Co-operation for Environmentally Friendly Aviation (ERA, ACI, AEA, AECMA, EBAA, EUROCAE)
CEO : Chief Executive Officers
CEP : Circular Error Probable
CER : Cancel Emergency Mode Request
CES : Central and Eastern European States

CESA : Class E Surface Area
CESAR : Course Evaluation Sheets Analysis and Reporting
CESC : Chief Executive Standing Conference (see CEO)
CEU : Central Executive Unit (ATM / CFMU)

CEU-E : Central executive unit with Responsibility for Eastern Europe

CEU-W : Central executive unit with Responsibility for Western Europe

CEW : Civil Engineering Works

CF : Change frequency to….
CF : Course to a Fix (ARINC 424 Path Terminator)
CFAR : Constant False Alarm Rate (or Regulation)
CFB : Central Flight plan Bank
CFCF : Central Flow Control Facility 
CFD : Change to Flight Data Message
CFDS : Central Flight Data Suite (PALLAS system)
CFE : Customer Furnished Equipment
CFEP : Communications Front End Processor

CGL : Circling Guidance Light(s)
CFIT : Controlled Flight into Terrain
CFL : Cleared (Current) Flight Level
CFM : Central Flow Management (services)
CFM : EEC business area - support to ATFM 
CFMU :  Central Flow Management Unit

CFMUSC : CFMU Steering Committee
CFTPD : Central File of Transponder Performance Data (ECC)

CFR : Code of Federal Regulations
CG : Center of Gravity

CGAS : Class G Airspace

CGS Centimeter-gram-second

CH : Channel

CH : Switzerland (ISO Country Code)
CHA : Character
CHAID : Chi Square Automatic Interaction Detection

CHAN : Channel
Chap. : Chapter
CHG : Change Message

CHG : Change of Modification
CHI : Computer-Human Interface
CHIEF : Project Switzerland (CH), Italy (I), Spain (E), France (F)
CHIRP : Confidential human Factors Incident Reporting Programme

CHMI : CFMU Human Machine Interface

CI : Cirrus
CI : Configuration Item

Cl : Cost Index

CI : China Airlines (airline)
CI : Course to Intercept (ARINC 424 Path Terminator)

CIA : CFMU Internet Application
CIADN : Croatian Integrated Aeronautical Data Network
CIC : Clearances and Information Communications
CICT : Convergence and Implementation Coordination Team (renaming of SICT)
CID : Computer Interface Device
CIDIN : Common ICAO Data Interchange Network
CIEL : Common Interface Exchange Language

CIG(s) : Ceiling(s)
CIM : Customer Information Management
CIMIL : Civil/Military Co-ordination
CINCAT : Capacity Increase through Computer Assistance Tools
CINCENT : Commander in Chief Central Europe
CINTIA : Control of Inbound Trajectories of Individual Aircraft
CIO : Conventional International Origin
CIP : CFMU Implementation Plan
CIP : Convergence and Implementation Programme

CIS : Commonwealth of Independent States (States of former USSR)

CIS : Cooperative Independent Surveillance
CIS : Critical Incident Stress
CISD : Critical Incident Stress Debriefing
CISM : Critical Incident Stress Management (HRT)
CISMO : Centralised International System Management Organisation

CIT : Compressor Inlet Temperature
CIT : Critical Incidence Technique

CIT : Near or over large towns
CITRAC : Common Interface for Trajectory Calculation
CIU : Cabin Interface Unit
CIV : Civil
CJEC : Court of Justice of The European Communities (=CJEC, COJEC now European Court of Justice)
CJI : Controller Justification Indicator

CK : Check

CL : Centre Line
CL : Cleared
CL : Connectionless Mode Service

CLA : Clear type of ice formation
CLA : OCM Clearnace Echoback Message (message in the OCM Service)

CLB Climb Detent of the Thrust Levers

CLBR : Calibration

CLD : Cloud
CLD : DCL Clearance Message (message in the DCL Service)

CLG : Calling
CLIMAX : Multi-station carrier offset mode, with voting override

CLKWS : Clockwise
CLNP : Connection Less Network Protocol
CLNS : Connection Less Network Service

CLR : Clear or cleared to or clearance

CLSD : Closed
CLTP : Connection Less Transport Protocol
CLW : Communications List Window
CLX : OCM Clearance Message
cm : Centimeter
CM : Configuration (Context) Management
CM : Common Memory (CBN - CNG)
CM : Conformance Monitoring
CM : Critical Milestone (MAS/DFS - ODS)
CMA : Central Monitoring Agency (NAT)
CMA : Context Management Application

CMB : Climb
CMB : Combined (PSR and SSR)

CMC Central Maintenance Computer
CMC : Central Master Clock
CMC : Constant Mach Blimb
CMCSG : Civil and Military Co-ordination Sub-Group
CMG : Crisis management Group
CMIC : Civil Military Interface Standing Committee (New Convention)

CMIP : Contract Management and Inspection Procedures
CMIS/CMIP : Common Management Information System / Protocol
CMMC : Central Monitoring and Management Centre
CMMC : Common Maintenance Monitoring and Control
CMOS : Complementary Metal Oxid Semiconductor

CMPL : Completed or Completion or complete
CMS : Central Message Switch
CMS : Common Modular Simulator (CMTP)
CMSA : Carrier Sense Multiple Access (ICAO-ADS)

CMSND : Commisissioned
CMT : Core Management Team
CMT : Critical Milestone Test (MAS/DFS - ODS)
CMTP : Common Medium Term Plan  

CMU : Communications Management Unit
CMV : Coverage Measurement Volume
CN : Change Notice

CN : China (ISO Country Code)
CN : Common Network (INTNET/RADNET)
CN : Permanent Commission for the safety of air navigation
CNACC : Common National Area Control Centre
CNATCC : Common National Air Traffic Control Centre (Bulgaria)
CNG : Common Network Group
CNL : Cancel(lation) message (ICAO)
CNS : Communication, Navigation and Surveillance
CNS : Study Group of Alternates
CNS/ATM : Communication, Navigation and Surveillance / Air Traffic Management
CNS/ATM-1 : Communication, Navigation and Surveillance / Air Traffic Management Package 1

CNTRLN : Centerline
CO : Connection Mode Service

CO Continetnal
COBALT : Common Objective Alignment Team
COBT : Calculated Off Block Time 
COC : Combat Operations Centre or Concept
COCESNA : Central American Corporation For Air Navigation Service
COCOS : Computer Controlled SSR Code Assignment Procedures
COD : Common Medium-Term Plan Overview Document
CODA : Central Office of Delay Analysis

CODE : Aircraft address (expressed in the form of an alphanumerical code of six hexadecimal characters) when required by the appropriate ATS authority

CODEC : Coder/Decorder (ACS)
CoE : Centre of Expertise
COF : Change of Frequency
COFA : Comando Operacional Força Aérea (PT)
COFAR : Common Options for Airport Regions
COFEE : Consolidated (Checked) Operational data FEEder
COG : Coordination Group (meeting of the EANPG Programme) ICAO
COHO : Coherent Oscillator
COLL : Collapse
COLOC : Change of Location of Command

COM : Cockpit Operating Manual
COM : Communications (ICAO)
CoM : EUROCONTROL Committee of Management
COM/DIV : ICAO Communications Divisional Meeting
COM/MET : Communications / Meteorology Divisional Meeting
COM/OPS : Communications / Operations
COMALF-E : Commander of Airlift Forces - Europe
COMED : Combined Map and Electronic Display
COMG : Communications Group
COMIL : Coordination Centre for Military Airspace Use 
COMIL-1N : ATS Coordination Centre for Military Airspace Utilisation - Phase 1 Network
COMLAN : COMmunication Local Area Network
Comm-B  : Mode S downlink format DF20 or 21
COMNAV : Groupe de travail sur les Télécommunications et les installations de navigation (CEAC)
COMP : Operating Company
COMPAS : Computer Oriented Metering Planning and Advisory System 
COMSEC : Communications Security
COMT : Communications Team
COMX : Undefined Future Communication System 
CON : Continuous

CONC : Concrete

COND : Condition

CONDAR : Conflict Detection and Resolution
CONDOR : Confidential Direct Occurence Report
CONF : Conflict
CONFACP : Conflict Accept
CONOPS : Concept of Operations of Mode S in Europe
CONP : Connection Oriented Network Protocol

CONS : Continuous

CONST : Construction or Constructed
CONT : Continue
Cont'd : Continued
CONUS : Continental United States
COO : Coordinator

COOR : Co-ordinate or coordination
COORD : Co-ordination

COP : Change over Point
COP : Contingency Operations Plan
COP : Co-ordination Point 
COPG : Common Operating Procedures Group
COPP : Connection Oriented Presentation Protocol
COPS : Common Operational Performance Specifications

COR : Correct or Corrected or Correction
COR : Correlate
CORA : Conflict Resolution Assistant
CorC++ : Computer language
CORE : Controlled Requirements Expression
CORE : CORE Requirements for ATM Working Positions
COROM : Cognitive Competencies Model

CO ROUTE Company Route (also CO RTE)

CORUM : Training and Human Resources Consultancy Company
COS : Chief of Staff
COS : Computer Operating Station
COSAAC : Common Simulator to Assess ATMF Concepts
COSP : Connection Oriented Session Protocol
COSPAS : Space system for the search of vessels in distress (translate. from Russian)
COST : (European) Cooperation in the Field of Scientific and Technical Research

COSU : CFMU/ENGD - Core Systems Unit
COSYNUS : AIRBUS Training Database

COT : At the Coast
COTP : Connection Oriented Transport Protocol

COTR Contracting Officer's Technical Representative
COTS : Commercial Off-The-Shelf (System)

COV : Cover or Covered or Covering
CP : Circular Polarisation
CP : Conflict Probe (PATs)
CP : Contact Person (Eurocontrol)

CP : Control Panel
CP : CWP Processor Unit
CPA : Closest Point of Approach
CPC : Constant Pitch Climb
CPC : Control and Processing Centre
CPCs : Certified Professional Controllers

CPCS : Cabin Pressure Control System
CPD : Continuous Professional Development

CPD : Coupled
CPDLC : Controller Pilot Data Link Communications
CPF : Central Processing Facility
CPI : Californian Psychological Inventory
CPL : Commercial Pilots License
CPL : Current Flight Plan (message)
CPL : Customer Priority Listing (NOG)
CPR : Conflict Prediction and Resolution
CPS : Central Print Service  / Central Processing System
CPS : Characters Per Second
CPU : Central Processing Unit
CR : Central Region
CR : Course to a VOR Radial (ARINC 424 Path Terminator)
CR : Czech Republic
CR(A)OC : Central Region (Air) Operations Centre
CRAF : Central Reservation Airspace Facility
CRAF : Civil Reserve Air Fleet
CRAF : Computer Resolution Advisory Function
CRAFS : Civilian Request for Airspace and Flight Data System
CRAM : Conditional Route Availability Message
CRATF : Communications Requirements Analysis Task Force
CRC : Control and Reporting Centre
CRC : Cyclic Redundancy Check
CRCO : Central Route Charges Office 
CRD : Conflict Risk Display
CRDA : Converging Runway Display Aid
CRDS : CEATS Research & Development & Simulation Centre
CRDS : Colour Raster Scan Display
CREME : Creating the EATCHIP Management Environment
CRF : Central Repair Facility (RMCDE - MAS)

CRITTER Civil Rotorcraft IFR Terminal-Area Technology Enhancement Research
CRM : Cockpit / Crew Resource Management
CRM : Collision Risk Modelling (ICAO - ADS)
CRM : Co-ordination Revision Message
CRMCS : Central RADNET Monitoring and Control System
CRNA : Centre Régional de la Navigation Aérienne (DGAC/DNA/SCTA, France)
CRS : Contingency Routing System
CRS : Controller Route Sequence (FPPS/DECADE)

CRS : Course
CRT : Choice Reaction Time

CRZ : Cruise
CS : Callsign or Contract Signature

CS : Cirrostratus

CS : Collapsed Sector
CSAC : Cooperative Structural Airspace Concept (ICAO)

CSAR : CFMU System Anomaly Report (FORM)
CSC : Common Signalling Channel
CSCE : Conference on Security and Cooperation in Europe

CSCW : Computer Supported Co-operative Work
CSD : Concept and System Domain

CSD Constant Speed Drive
CSD : Context and Scope Document
CSD : Context Specification Document 
CSDT : Concept & Systems Development Team
CSDT : Context and System Domain Team
CSEL : Combat survivor evader locator
CSF : Critical Success Factor (EATMS, CSD)
CSFR : Czech and Slovak Federal Republic
CSI : Combined Safety Investigation
CSI : Critical Success Indicator
CSM : Central Service Modules (RMCDE / RADNET)

CSM : Chaotic Situation Management
CSMA : Carrier Sense Multiple Access
CSMA/CD : Carrier Sense Multiple Access with Collision Detect
CSN : Channel Sequence Numbers

CSO : CFMU/ENGD/SOS - CFMU System Operations HELPDESK Team
CSP : Communication Service Provider
CSPD Unit : CEATS Strategy, Planning and Development Unit
CSPDU : CEATS Strategic Planning & Development Unit
CSR : Cursor
CSR : Customer Service Requests (NOG - database for DPN operators)
CSSR : Conventional SSR
CSU : Control Sector Unit
CSU-P : Centre Supervisor 
CT : Centre (select)
CT : Cooperative Tools (PATs)
CT : Core Tasks
CT : Core Team
CTA : Calculate Time of Arrival

CTA : Controlled-Time of Arrival
CTA : Cognitive Task Analysis

CTA : Control Area (ICAO Term)

CTAM : Climb to and maintain

CTAS Center TRACON Automation System
CTB : Co-operative Tube Based
CTC : Cancel All Contracts And Terminate Connection Request (ICAO)

CTC : Centralized Train Central

CTC : Contact
CTD : Calculated time of Departure
CTF : Communication Task Force 
CTG : Common Training Group (of AISAP)
CTI : Collegiate Training Initiative

CTL : Control
CTMO : Central Air Traffic Flow Management Organisation (ICAO concept)

CTN : Caution
CTO : Calculated Time Over
CTO : Computed Time Over (CFMU - CASA)
CTOT : Calculated Take Off Time

CTR : Center

CTR : Civil Tilt Rotor
CTR : Controller or Control Zone

CTRL Control
CTRS : Common Time Reference System 
CTS : Command Tracking Stations
CTWUEC : Committe of Transport Workers' Unions in the European Compmunity (now FST : Federation of Transport Workers' Unions in the European Union = acronym formed from its French title)
CU : Control Unit

CU : Cumulus

CUF : Cumuliform
CUG : Closed User Group
CUP : Computer Utility Program
CUP : CWP-Unit Processor
CUR : Current Sector or Centre or Controller

CUST : Customs
CV : Curriculum Vitae
CVFR : Controlled Visual Flight Rules
CVO : Code Validity Overlap
CVR : Cockpit Voice Recorder
CVR : Console Voice Recorder
CVSM : Conventional Vertical Separation Minimum

CVSRF Crew-Vehicle Simulation Research Facility (NASA Ames)
CW : Clockwise

CW : Continuous Wave
CWAR : Continuous Wave Acquisition Radar
CWBS : Contract/Complete Work Breakdown Structure
CWDPS : Central Weather Data Processing System
CWIR : CFMU Generated What-If Re-routing
CWP : Controller Working Position

CWS : Control Wheel Steering
CWS : Collision Warning System

CWY : Clearway

CX : Cathay Pacific Airways (airline)
CY : Cyprus (ISO Country Code)

CY : Cyprus Airways (airline)
CYPRO : Cyprus Project for ATC Improvements
CYTA : Cyprus Telecommunications Authority
CZ : Czech Republic (ISO Country Code)
CZM : Conventional Zero Meridian
CZW : Conflict Zoom Window (ODID)

-D-

D…: Danger Area

D : Day

D : Derated

D : Downward (tendency in RVR during previous 10 minutes)
D : Germany
D&D : Distress and Diversion
D.O.T : Department of Transport
D/A : Digital-to-Analog

D/D Drift Down
D/L : Data Link
DA : Decision Altitude
DA : Descent Adviser
DA : Dimensional Aspect
DA : Direct Access (VCS)
DA/H : Decision Altitude Height
DAA : Dynamic Airspace Allocation

DAAIS : Danger Area Activity Information Service
DAARWIN : Distributed ATM Architecture based on RNAV, Workstations, Intelligent tools, and Networks
DABS : Discrete Address Beacon System (U.S.A)
DAC : Deployable ACCS Component
DAC : Direction Aviation Civile
DAC : Dynamic Air Traffic Control Test
DACT : Dissimilar Air Combat Training
DAF : Demand Adjustment Factors

DADC Digital Air Data Computer

DAFIF : Digital Aeronautical Flight Information File
DAI : Direct Access Intercom (VCS)
DAISY : Distributed Airport Information System (RUN)
DAIW : Danger Area Altitude Warning (or Area Proximity Warning)

DALGT : Daylight

DAP : Directorate of Airspace Policy
DAP : Downlink Aircraft Parameter
DAPs : Downlinked Aircraft Parameters
DARC : Direct Access Radar Channel

DAS : Directorate ATM Strategies (Eurocontrol)
DAS : DME Based Azimuth System
DAS : Dual Attachment Station (ODS - FDDI)
DASA, Dasa : Deutsche Aerospace
DASR : Department of ATC Systems Research
DAT : Differential Aptitude Test

DATALINK Digitized Information Transfer (air/ground)
DATAS : Datalink and Transponder Analysis System
D-ATIS : Digital ATIS
DATS TF : Delegation of ATS Task Force (ANT)
D-ATSU : Downstream Air Traffic Service Unit
DAVINCI : Departure and Arrival Integrated Management System for Cooperative Improvement of Airport Traffic Flow
DB : Data Base
dB : decibel
DBC : Data Bank COMECON
DBE : Data Bank EUROCONTROL
dBi : decibel with respect to an isotropic antenna
dBm : decibel, referenced to 1 milliwatt
DBMS : Data Base/Data Bank Management System
DBS : Data Base System

DBS Direct Broadcast Satellite
dBW : decibel, referenced to 1 watt
dBZ : decibel, units of reflectivity
DC : Departure Clearance (ICAO)
DC, d.c. : Direct Current Electricity / Device Control
DCA : Department of Civil Aviation (various countries)
DCA : Director(ate) of Civil Aviation
DCAM : Department Civil Aviation of Malta
DCC : Data Country Code (CCITT X.121 Structure)

DCD : Double Channel Duplex
DCDU : Datalink Control and Display Unit
DCE : Data Circuit-terminating Equipment (RADNET / RMCDE)
DCE : Data Communications Equipment
DCF : Discounted Cash Flow
DCF77 : German time standard, emitting on 77.5 kHz with callsign DCF
DCFEP : Data (Digital) Communications Front End Processor
DCIA : Dependent Convergent Instrument Approaches

DCKG : Docking
DCL : Departure Clearance
DCM : Decomposition and Consolidation Matrix
DCM : Document Configuration Management (EATCHIP/EATM)
DCM : Downstream Clearance Message (Service)

DCMSN : Decommission

DCMSND : Decommissioned
DCOS : Deputy Chief of Staff
DCP : Display Control Panel
DCPC  : Direct Controller Pilot Communication
DCPs : Dedicated Personal Computers
DCR : Design Certification Review  
DCR : Display Control Readout (EAS)
DCRCO : Director Central Route Charges Office
DCS : Data Communications System

DCS : Double Channel Simplex
DCT : Direct (Routing)
DCT-LB : Direct Telephone - Local Battery
DCTS : Digital Communications Terminal System (UACM)
DCU : Display Control Unit
DCW : Digital Chart of the World
DDA : Downstream Data Authority
DDB : Dynamic Databank/Database
DDC : Data Display Console
DDD : Detailed Design Document
DDE : Dynamic Data Exchange
DDL : Data Description Language
DDM : Data Display Monitor
DDP : Declaration of Design Performance
DDP : Distributed Data Processing
DDU : Display Drive Unit
DE : Germany (ISO Country Code)
DEA : Data Exchange Agreement
Debrief : Debriefing

DEC Digital Equipment Corporation
DECADE : DFS/EUROCONTROL Common ATC Development (ESCO)
DECCA : Hyperbolic Area Navigation System

DECR Decrement

DED : Director EATCHIP Development (in the former Agency structure)

DEE : Data Entry Equipment
DEEC : Director of the Eurocontrol Experimental Centre
DEFAMM : Demonstration Facilities for Airport Movement Management (Alcatel) (F)
DEG : Data Environment Generator 
Deg : Degrees (Radar Standard)

DEGS : Degrees
DEI : Directorate EATCHIP Implementation (in the former Agency structure)
DEL : Delete
DEL : Deliverable
DEM : German Marks
DEMETER : Distance Measuring Equipment Tracer
DEMETER : DME Metering (analysis tool for DME coverage / NAVSEP)
Demo : Demonstration
DEP TC : Departure Tactical Controller
DEP : Depart, Departure (Message)
DEPA : Departure Airfield
DEPCOS : Departure Coordination System

DEP PROC : Departure Procedure
DEP-VKL : Departure Controller
DER : Departure End of the Runway
DERA : Defense Evaluation and Research Agency (UK)  

DERD-X : Display of Extracted Radar Data - Extention (-Mini Computer)
DERD-X/XL : Display of Extracted Radar Data - Expanded/Expanded with LAN
DES : Data Exchange System
DES : De-Suspension Message

DES : Descent

DES : Draft Eurocontrol Standard Document
DESC : Descending
DEST : Destination Aerodrome (Airfield)
DETF : Data Exchange Trest Facility

DE-TO PR Derated Takeoff Engine Pressure Ratio

DE-TO Nl Derated Takeoff Engine Fan Speed

DETR : Department of the Environment, Transport and the Regions (UK)

DETRESFA : Distress Phase

DEV : Deviation  
DEV : Domain Executive View

DEVD : CFMU – Development Division
DF : Direct to a Fix (ARINC 424 Path Terminator)
DF : Direction Finding or Display Field (VCS)
DF : Directorate Finance / Direction des Finances
DFDAU : Digital Flight Data Acquisition Unit

DFDR Digital Flight Data Recorder

DFGS/C Digital Flight Guidance System/Computer
DFIS : Data Link Flight Information Service (ICAO)
DFL : Division Flight Level
DFL : Dynamic Flight Leg
DFS : Detailed Functional Specification (CBN - CNG)
DFS : German ATC Corporation (Deutsche Flugsicherung GmbH)
DFTI : Distance from Touchdown Indicator

DGAC : Direction Générale de l'Aviation Civile (F)
DGCA : Director General of Civil Aviation of ECAC Member States
DGE : Director General Eurocontrol
DGNSS : Differential Global Navigation Satellite System
DGOF : Director General's Office
DGON : Deutsches German Institute for Navigation
D-GPS : Differential Global Positioning System (ICAO - ADS)
DGS : Director General Secretariat
DGVII : Directorate General of Transport / European Commission
DH : Decision Height
DHMI : Devlet Hava Meydanlari Isletmesi (TU) / State Agency for Aisports and air Traffic Control (Turkey)
DHP : Direct Host Processor
DHR : Directorate Human Resources
Di : Detectability
DIADAM : Distributed ATM Data Management
DIANS : Director Institute of Air Navigation Services
DIB : Directory Information Base
DICE : Direct Course Error
DID : Direct Identification Data

DIF : Diffuse
DIGEST : Digital Exchange Standards
DIL : Data Items List
DILCS : Dedicated Intelligence Loop Circuits System
DIN : Deutsche Industrie Norm

DIR Direct

DIR/INTC Direct Intercept
DIRA : Department for Interdisciplinary Relations of Aviation
DIRCAM : Direction de la Circulation Aérienne Militaire
DIS : Data Displayed
DIS : Directorate Infrastructure ATC Systems and Support (Eurocontrol, EATM)

DIS : Distance

DISABLD : Disabled

DISCR : Discrepancy
DIS/HUM : ATM Human Resources Unit (also know as HUM unit)

DIST : Distance
DIV : DIVert(ing) or DIVerging
DK : Denmark (ISO Country Code)
DL : Data Link

DL : Delta

DL : Delta Airlines (airline)

DLA : Delay or Delayed (Message)
DLA : ATS message indicator for delay (ICAO)
DLARD : Data Link Application Requirements Document (Description) (ICAO)
DLASD : DL Application System Document
DLCRD : Data Link Communication Requirement Document
DLF : Data Link Frame
DLH : Deutsche Lufthansa (Germany)
DLIC : Data Link Initiation Capability (ICAO)
DLL : Data Link Layer
DLL : Delay Locked Loop

DLP Data Link Processor (the FAA's ground automation system that supports the Mode S subnetwork (GDLP), internetwork (ATN router) and non-ATC data link application processes)
DLPU : Data Link Processing (Processor) Unit
DLR : German Aerospace Centre (formerly the `German Aerospace Research Institute)
DLS : Data Link Splitter

DLT : Delete

DLY : Daily
DLW : Departure List Window (ODID)

DM : Maerks Air Denmark (airline)
DM : Departure Manager (PATs)
DMA : Decision Making Aids
DMA : Defense Mapping Agency
DMA : Direct Memory Access
DMA : Divergence Monitoring and Alert
DMAN : Departure Manager
DMAS : Director Maastricht Control Centre

DMC : Display Management Computer
DMC : Detachment of Military Coordinators
DME : Distance Measuring Equipment
DME/P : Precise DME
DML : Data Manipulation Language

DMR : Data Modification Reques
DMS : Database Management System

DMSTN : Demonstration

DMU : Data Management Unit
DNAs : ECAC Directors of Air Navigation

DNG : Danger or Dangerous
DNIC : Data Network Identification Codes (CCITT X.121 Structure)
DNS : Digital Network Signalling

DNTKFX : DownTrack Fix

DOC : Designated Operational Coverage
DOC : Direct Operating Cost
DOC : Document (ICAO)
DoD MIL : Department of Defence - military
DoD : Department of Defence (US)
DODAR : Diagnosis, Options, Decision, Assessment and Revision
DOF : Date of Flight  
DOI : Department of Industry

DOM : Domestic
DOP : Daily Operations Plan
DOP : Dilution of Precision
DORA : Directorate Operational Research and Analysis (UK)
DOS : Disk Operating System

DOT Department of Transportation
D-OTIS : Data Link Operational Terminal Information Service
DOTS : Dynamic Ocean Tracking System

DP : Dewpoint Temperatue
DP : Discussion Paper
DP&P : Data Processing and Peripherals
DPA : Distinguishing Path Attribute
DPC : Defence Planning Committee
DPDG : Diplomatic and Protocol Drafting Group
DPE : Digital Plot Extractor
dpi : dots per inch
DPL : Deputy Project Leader
DPL : Displayed Flight Plan
DPL : Duplicate Plan
DPS : ATM Data Processing System
DPS : Detailed Production Specification
DPS : Distributed Processing System
DPSADD-TF : Data Processing Systems Architecture Description Document Task Force (ATD)
DPSK : Differential Phase Shift Keying

DPT : Depth
DPT : Dynamic Time-based Planning

DR…: Low drifting (followed by DU SA or SN)

DR : Drifting (meteo)
DR : Dead Reckoning
DR : Disaster Recovery
DRA : Defense Research Agency (UK)
DRAM : Dynamic Random Access Memory
DRC : Defence Review Committee
DRC : Dynamic Route Change
DRCP : Data Reduction Computer Program
DRDF : Digital Readout Direction Finder
DRF : Departure Flow Regulation

DRFT : Snowbank(s) caused by wind action

DRG : During
DRMS : Distance Root Mean Square

DRU Data Retrival Unit
DRUG : Dutch Radars Users Group (NL-Eurocontrol)
DRUM : Diagnostic Recorder for Usability Measurement
DS : Data Source

DS : Dust Storm (meteo)
DSA : Director(ate) Safety, Airspace, Airports and Information Services (Eurocontrol, EATM)

DSA : Directory System Agent
DSAP : Destination Service Access Point (RMCDE / RADNET)
DSB : Double Side Band (8.33 User Guide)
DSC : Downstream Clearance
DSCVHF : Digital Selective Calling - Very High Frequency
DSF : Distribution and Switching Facility
DSI : Data Source Interface 
DSI : Denmark Sweden Interface  
DSM : Departure Suspense Message
DSP : Datalink Status Panel
DSP : Digital Signal Processor
DSP : Domain Specific Part

DSPLCD : Displaced

DSPY Display (annunciation on CDU)
DSS : Data Systems Specialist
DSS : Decision Support System
DSS : Direct Subsystem
DST : Decision Support Tools
DST : Direct Support Task
DSU : Data-Source Selector Unit
DSU : Direct Support Unit
DT&E : Development, Test and Evaluation

DTAM : Descend to and maintain
DTE : Data Terminal Equipment (RMCDE)
DTED : Digital Terrain Evaluation Data (militaries ECAC)

DTG : Date Time Group
DTF : Data Link Test Facility (ICAO)

DTG Distance-to-go
DTMF : Dual Tone Multifrequence (code)
DTN : Data Transport Network
DTP : Desk Top Publishing

DTRT : Deteriorate or Deteriorating
DTS : Data Terminal Set
DTS : Data Transmission System
DTU : Data Transmission Unit (VCS)
DTVOR : Doppler Terminal VOR

DTW : Dual Tandem Wheels
DU : Display Unit

DU : Dust (meteo)
DUA : Dedicated User Area
DUA : Directory User Agent
DUAT : Direct User Access Terminal
DUAU : Data Update and Access Unit

DUC : Dense Upper Cloud

DUR : Duration
DVAS : Documentation and Visual Aids Specialist
DVI : Direct Voice Input
DVO : Direct Voice Output
DVOR : Distance VOR
DVOR : Doppler VOR

DVORTAC : Doppler VOR and Tacan
DVP : Development and Verification Platform (part of EGNOS)

DW : Dual Wheels
DWP : Departure Waypoint
DYNAV : Dynamic Route Availability

DZ : Drizzle
DZ : Algeria (ISO countries Codes)

-E-

E : East

E : Spain

E/D End-of-Descent

E/O Engine-Out
E+M : signalling
EA : Europe Airsports
EAA : European Aviation Agency
EAC : East Assistant Controller
EACAC : Evolutionary AIR Ground Cooperative ATM Concept
EACG : European ATFM Consultation Group
EACNSISG : EATCHIP Architecture and CNS Infrastructure Sub-Group
EAD SGR : EAD Sub-Group
EAD : Earliest Arrival Date
EAD : European AIS Database
EADCOS : EAD Co-ordination Group
EADI : Electronic Attitude Director Indicator
EADTF : European AIS Database Task Force
EAG : European ATFM Consultation Group and its two Subgroups (Operations and Systems Sub-Group)
EAG : Event Analysis Group
EAIP / EAIP-TF : Electronic Aeronautical Information Publication (Task Force)
EAM : Eurocontrol Airspace Model
EAMG SSG : EAMG Systems Sub-Group
EAMG :  European ATFM Management Group (supervision of the CFMU)
EAN : European ATSO Network
EANPG : European Air Navigation Planning Group (ICAO)
EAP : EATCHIP Alignment Process
EARTS : En-Route Automated Radar Tracking System

EAS Equivalent Airspeed
EAS : EUROCONTROL Advisory Service / Division
EAS : European AIS System
EASA : European Aviation Safety Authority (Agency)
EASG : EASIE ATM Support Group
EASIE : Enhanced Air Traffic Management and Mode S Implementation in Europe
EAT : Expected / Estimated Approach Time
EATCFMU : European Air Traffic Central Flow Management Unit
EATCHIP LO : EATCHIP Liaison Officer
EATCHIP OCD : Operational Concept Document
EATCHIP : European Air Traffic Control Harmonisation and Integration Programme (see EATM)
EATCOS : ECAC TF on the Integration of European ATC Systems
EATF : EATMS Architecture Task Force
EATM : European Air Traffic Management Programme (former EATCHIP)

EATMP : The European Air Traffic Management Programme
EATMS : (Future) European Air Traffic Management System
EATN : (European) Experimental Aeronautical Telecommunication Network 
EAWDG : EATMS Architecture Workshop Drafting Group

EB : Eastbound
EB : Executive Board (of the EUROCONTROL Agency)
EBAA : European Business Aviation Association
EBCDIC : Extended Binary Coded Decimal Interchange Code
EBP : Emergency Bypass Processor 
EC : European Commission
EC : European Community
EC : Executive Controller (also referred to as `Radar Controller')
EC : Eyes closed
ECA : Executive Controller Assistant
ECAC  : European Civil Aviation Conference
ECAC area : European Civil Aviation Conference Area
ECAC Reference Levels : European Civil Aviation Conference Area Reference Levels
ECAC Strategy : European Civil Aviation Conference Strategy
ECAF : ECAC Centralised Airspace Facility
ECAM : Electronic Centralised Aircraft Monitoring (airbone display)
ECARDA : European Coherent Approach to Research and Technological Development for ATM
ECBAG : EATCHIP Cost-Benefit Advisory Group
ECC : EATCHIP Co-ordination Committee
ECC-AIRS : European Co-ordination Centre for Aircraft Incident Reporting Systems (EC)
ECCG : Experimental Centre Consultation Group
eCE : enlarged Committee for Route Charges
ECEF : Earth-Centered-Earth-Fixed

ECET : End of Civil Evening Twilight
ECG : EATCHIP Communication Gateway
ECHO : EATCHIP CNS/ATM Holistic Model Using RM-ODP
ECHQ : Eurocontrol Headquarters
ECI : EAD Client Interface
ECIP : European Convergence and Implementation Plan
ECIPD : Document ECIP
ECIT : EAD Client Interface Terminal
ECM : EATCHIP Co-ordination Meeting
ECM : Electronic Counter Measure / Message
ECM : Executive Control Message
ECM : Extended Callsign Menu
ECMA : European Computer Manufacturers' Association
ECMT : European Conference of Ministers of Transport
eCN : enlarged Commission

ECON Economy (minimum cost speed schedule)
ECP : Engineering Change Proposal
ECP : Expedite Clearance Procedure
ECR : Event Contract Request (ICAO)
ECRSG : EATMS Concept & Requirements Sub-Group
ECRG : Experimental Centre Review Group

ECS Environmental Control System
ECSC : European Conference on Satellite Communications
ECT : European Coordination Team
ECTF : EATMS Concept Task Force
ECU : European Currency Unit
Ed(s) : Editor(s)
ED50 : European Datum 1950 (Geodetic system)
ED70 : European Datum 1970 (Geodetic system)
ED87 : European Datum 1987 (Geodetic system)
EDA : Electro-Dermal Activity measurement
EDAG : European Delay Analysis System Advisory Group
EDAS : European Delay Analysis System
EDAS : European Delay Analysis System
EDB : Environmental Data Base

EDCT : Expect Departure Clearance Time
EDD / TID : EDD / Touch Input Device
EDD : Electronic Data Display
EDDF : Environmental Data Processing and Distribution Function
EDDUS : EDD Update System
EDD-VKL : EDD-controller/planner-controller
EDI : Electronic Data Interchange
EDIFACT : Electrical Data Interface for Administration Commerce and Transport 
EDISOFT : Empresa de Serviços e Desenvolvimento de Software, S.A. (PT)
EDMS : Engineering Data Management System (ODS - MAS)
EDP : Electronic Data Processing
EDP : Environmental Data Processing
EDPD : Environmental Data Processing and Distribution
EDS : Explosives Detection System
EE : Estonia (ISO Country Code)
EEB : European Environmental Bureau

EEC : Electronic Engine Control
EEC : EUROCONTROL Experimental Centre
EEC : European Economic Community
EEC/BSC : Eurocontrol Experimental Centre / Building Steering Committee (decision DG)
EEE : Etudes, Essais and Experimentation
EEG : Electroencephalogram
EEI : Essential Elements of Information
EEPROM : Electrically Erasable Programmable Read-Only Memory 
EES : European Eastern States
EET : Estimated Elapsed Time

EFAS : Electronic Flash Approach Light

EFAS : En Route Flight Advisory Service

EFC : Expect(ed) Further Clearance
EFDFMG : EUROCONTROL Flow Data and Flow Management Group
EFDP : European Flight Data Processing

EFIS : Electronic Flight Instrument System

Eff : Effective from (date)
EFL : Entry Flight Level
EFL : Estimated Flight Level
EFMS : Experimental Flight Management System
EFP : España-France-Portugal Plan (co-operation agreement)
EFPD : Extended Flight Plan Description
EFPM : Extended Flight Plan Message
EFPS : External Front Processing System (PALLAS system)
EFQM : European Foundation for Quality Management
EFR : Extended Flight Rules (FREER)
EFS : Electronic Flight Strip
EFS : Extended Flight Store
EFTA : European Free Trade Association
EG : Egypt (ISO Countries Codes)
EGA : Enhanced Graphics Adapter
EGATCM : Eurocontrol Guild of Air Traffic Controllers - Maastricht
EGATS : EUROCONTROL Guild of Air Traffic Services
EGERIA : Engineering Group for European Integration ATC
EGIP : European Gateway for INO Provision
EGNOS : European Global Navigation Overlay Service (SNA)
EGNOS-EM : European Global Navigation Overlay Service - East Mediterranean

EGPWS : Enhanced Ground Proximity Warning System

EGT Exhaust Gas Temperature
EGU : European Gliding Union
EHA : European Helicopter Association
EHD : Danger Area  (followed by identification) [NL]
EHF : Extremely High Frequencies
EHQ : Eurocontrol Headquarters
EHR : Restricted Area (followed by identification) [NL]
EHSI : Electronic Horizontal Situation Indicator
EHT : Extemely High Tension

EI : Air Lingus (airline)
EIA : Electronic Industries Association
EIB : European, Investment Bank

EICAS Engine Indicating Crew Alerting System
EIF : Extended Interface Function
EIIC : Electronics Installation and Implementation Centre
EIPA : European Institute of Public Administration
EIRP : Effective / Equivalent Isotropic Radiated Power
EIS : Environmental Information Sampling

EIU Electronic Interface Unit
EL : Electro-Luminescent

ELBA : Emergency Location Beacon-Aircraft
EL/KYB : EL Keyboard
ELEV : Elevation (environment)
ELINT : Electronic Intelligence
ELM : Extended Length Message

ELR : Extra Long Range
ELS : Electronic Library Service (System)
ELS : Emergency Landing Strip
ELT : Emergency Locator Transmitter
ELW : Extended Label Window

EM : Emission
EMAS : Environmental Management Audit System (Hamburg Airport)

EMBD : Embedded (cumulonimbus) in a layer
EMC : ElectroMagnetic Compatibility
EMCC : EATM Management Coordination Committee
EMCON : Emission Control

END : Stop-end (related to RVR)
EME : Expert militaire d'Eurocontrol

EMER : Emergency
EMERALD : EMErging and Activities of reLevance to ATM concept Definition (European Commission)

EMERG : Emergency
EMEU : Eurocontrol Military Expert Unit
EMF : Exercise Management Facility (Simulator)
EMG : EAD Management Group
EMG : ElectroMyoGram
EMG : Emergency (ICAO)
EMH : EATCHIP Management Handbook
EMI : Electromagnetic Interference
EMIRA : Eurocontrol Maastricht Information Retriever Application
EMIS : EATCHIP Management Information System
EMM : Extractor Monitoring Message
EMOTION 7 : European Maintenance Of TCAS II Logic Version 7.0 (EMOTION 7)
EMP : ElectroMagnetic Pulse
EMS : EATCHIP Management Support

EMS Emergency Medical Services  
EMS : European Mobile System
EMSO : EATCHIP Management Support Organisation
EMSS : European Mobile Satellite Services
EMT : Eye-Movement tracking
EMTO : ECAC Medium Term Objectives Group (to deal with `Constraints to Growth'
EMU : Extended Memory Unit
EN : Euro Norm (CEE)

ENE : East-North-East
ENG : Engineering / Engine

ENGD : CFMU – Engineering Division
ENHANCE : EuropeaN Harmonised Aircraft Noise Control modelling Environment (NATS-DORA)
ENJJPT : Euro-NATO Joint Jet Pilot Training
ENOC : European Network Operating(tion) Concept
ENPRM : European Notice of Proposed Rule-Making
ENR : En-route (ICAO)
ENRI : Electronic Navigation Research Institute (USA - ADS)

ENRT : En Route
ENV : Environment System 
EO : Executive Objectives (EATMS - CSD)
EO : Eyes Open

EOBD : Estimated Off Block Date
EOBT : Estimated Off Block Time 
EOC : Edge Of Coverage
EOCD : EATMS Operational Concept Document
EODP : EATMS Options Discussion Paper
EOG : ElectroOculoGram
EOIG : EGNOS Operators and Infrastructure Group - the ATS providers in the states formerly known as the IKD States
EOLIA : European Pre-operational Datalink Applications Project
EONS : Eurocontrol Open and Generic Graphic System
EOQ : European Organisation for Quality
EP : Expert Panel
EPAC : EATCHIP Policy and Allocation Committee
EPAC : Eurocontrol Programme Appraisal Committee
EPB : EATCHIP Project Board
EPC : Enhanced Planning and Coordination function (project of MDP phase I)
EPCM : Enhanced Planning Control Message
EPD : EATCHIP Planning Division 
EPG : EASIE Policy Group
EPHOS : European Handbook for Open Systems
EPIC : European Programme for the Implementation of a Common geodetic reference frame (WGS 84)
EPIC : Extended PCM Interface Controller (ACS)
EPM : EATCHIP Planning Method
EPM : Electromagnetic Protection Modification
EPMB : EASIE Programme Management Board

EPR Engine Pressure Ratio
EPR, DGS/EPR : External and Public Relations
EPROM : Erasable-Programmable Read-Only-Memory
EPRT : External Processing Response Time
EPS : Exercise Preparation Suite (Simulator)
EPSU : European Public Service Union
EPT : Estimated Parking Time
EPT : Eurocontrol English language Placement Test
Eqpt : Equipment
EQUATOR : Environment for Qualitative Temporal Reasoning (AI)

EQPT : Equipment
ER  : En-Route
ER TC : En-Route Tactical Controller
ERA : European Regional Airlines Organisation
ERABIS : (Swedish) Route Invoicing System
ERATO : En Route Air Traffic Organiser
ERCG : External Relations Coordination Group
ERCS : EXM Resistant Communications System
ERD : End Routing Domain
ERDF : European Regional Development Fund
ERFA : Conference on the Economics of Route Air Navigation Facilities and Airports (ICAO)