This is a list of common abbreviations and acronyms in Air Traffic Management. If you have any suggestions on additional items or links please contact Jürgen Teutsch at the National Aerospace Laboratory of the Netherlands in Amsterdam.

This database comprises 3060 entries.

Last update: 22-Dec-2020

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
2D	2-Dimensional
3D	3-Dimensional
3FMS	Free Flight FMS
4D	4-Dimensional
4D-ATM	4-Dimensional Air Traffic Management
4D-FMS	4-Dimensional Flight Management System
4D-NAV	4D Navigation
4D-TN	4D Trajectory Negotiation
4D-TR	4D Trajectory Re-planning Service (AFAS)
A
A	Advanced
A	Alpha Time Zone (UTC + 1 hrs.)
A	Radar Associate Controller
A/A	Air/Air
A/C	Aircraft
A/D	Analog-to-Digital
A/D	Arrival/Departure
A/G	Air/Ground
A/L	Airline
A/P	Airport
A/P	Autopilot
A/S	Air Space
A/T	Autothrottle
A/V	Avionics
A4E	Airlines for Europe (former AEA)
AAA	Amsterdam Advanced ATC (LVNL)
AAAPI	Advanced Airport Approach Procedures Implementation
AAC	Aeronautical Administrative Communication
AADT	Advanced Arrival and Departure Techniques
AAF	Army Air Field
AAF	Associate Administrator for Airway Facilities
AAGDI/AGADE	Automated Air/Ground Data Interchange
AAIB	Air Accident Investigation Branch (British equivalent of NTSB)
AAL	Above Aerodrome Level
AAMS	Advanced Airspace Management System
AAMS	Airport Airside Management System
AAR	Airport Acceptance Rate
AAS	Advanced Automation System
AAS	Airborne Approach Spacing
AAS	Airport Advisory Service
AAS	Amsterdam Airport Schiphol
AAST	Airport Arrival Slot Time
AATMS	Airborne ATM System
AATS	Agile Air Traffic System (JPDO-IPT)
AATT	Advanced Air Transport Technologies (NASA)
AAVIP	Advanced ATM Validation Integrated Platform (LFV)
AB	Air Base
ABAS	Aircraft Based Augmentation System
ABD	Airbus Directive
ABI	Advanced Boundary Information (OLDI Ground/Ground Message)
ABL	Analysebureau Luchtvaartvoorvallen Bureau for Analysis of Air Travel Incidents
ABN	Aerodrome Beacon
ABNA	Airspace Bottleneck Analyser (AENA)
AC	Air Carrier
ACA	Approach Control Area
ACA	Arctic Control Area
ACARE	Advisory Council for Aeronautics Research in Europe
ACARS	Aircraft Communications Addressing and Reporting System
ACAS	Airborne Collision Avoidance System (EUROCONTROL)
ACC	Area Control Centre
ACCC	Area Control Computer Complex
ACCD	Advanced Continuous Climb Departure
ACCES	Airport and Control Centre Simulator (DLR)
ACD	Engineering, Research and Development Service
ACDA	Advanced Continuous Descent Approach
A-CDM	Airport Collaborative Decision Making
ACE	AVENUE Compliant ESCAPE (EUROCONTROL)
ACES	Adaptation Controlled Environment System
ACGT	Actual Commence of Ground Handling Time
ACH	Change Message (FPL)
ACI	Adjacent Channel Interference (VDL)
ACI	Airports Council International
ACID	Aircraft Identification
ACIS	Airport CDM Information Sharing
ACISP	Airport CDM Information Sharing Platform
ACK	Acknowledgement Message
ACL	ATC Clearance (Datalink Service)
ACLT	Actual Calculated Landing Time
ACM	ATC Communications Management
ACMS	Aircraft Condition Monitoring System
ACN	Aircraft Classification Number
ACOD	Area Conflict Detection Tool (Server)
ACP	Achieved Communication Performance
ACP	ASAS Crossing Procedure
ACP	Audio Control Panel
ACS	Advanced Cockpit Simulator (ENAV)
ACSE	Association Control Service Element
ACSUP	Area Control Centre Supervisor
ACT	Activation of Flight Plan (Ground/Ground Message)
ACZT	Actual Commencement of De-icing Time
AD	Aerodrome
AD	Airworthiness Directive: FAA regulatory notice
ADA	Advisory Area
ADAP	Automated Downlink of Airborne/Aircraft Paramaters
ADAS	Aircraft Departure / Arrival Sequencing System
ADB	Airports Database (EUROCONTROL)
ADC	Air Data Computer
ADD	Airborne Derived Data
ADEP	Aerodrome of Departure
ADES	Aerodrome of Destination
ADEST	Aerodrome of Destination
ADEXP	ATS Data Exchange Presentation (EUROCONTROL)
ADF	Airline Dispatcher's Federation (U.S.)
ADF	Automatic Direction Finding
ADI	Aerodrome Control Instrument (Rating)
ADI	Attitude Director Indicator
ADIRS	Air Data Inertial Reference System
ADIRU	Air Data Inertial Reference Unit
ADIT	Actual De-icing Time (AEZT - ACZT)
ADIV	Airport of Diversion (ICAO)
ADIZ	Air Defense Identification Zone
ADLIDSSS	Aeronautical Data Link/Decision Support System Services
ADLP	Airborne Data Link Processor
ADM	Air Data Module
ADP	Air Traffic Flow and Capacity Management Daily Plan
ADPE	Automated Data Processing Equipment
A-DPI	ATC Departure Planning Information Message
ADR	Advisory Route
ADR	AFAS Document Repository
ADR	Air Data Reference
ADR	Airborne Doppler Weather Radar
ADS	Advanced Distributed Simulation
ADS	Air Data System
ADS	Automatic Dependent Surveillance (ATN Application)
ADS-A	Automatic Dependent Surveillance-Addressable
ADS-B	Automatic Dependent Surveillance-Broadcast
ADS-C	Automatic Dependent Surveillance-Contract
ADSP	ADS Panel
ADST	Airport Departure Slot Time
ADT	Air Data Tester
ADU	ARTS Data Unit HWCI
ADV	Advisory Area
ADV	Aerodrome Control Visual Rating
AE	Application Entity
AEA	Association of European Airlines
AECMA	European Association of Aerospace Industries
AEEC	Airlines Electronic Engineering Committee
AEGT	Actual End of Ground handling Time
AEIS	Aeronautical Enroute Information Service
AEM	Advancd Emissions Model (EUROCONTROL)
AEM	Aircraft Encounter Model
AEM	Airfield Estimate Message
AENA	Aeropuertos Españoles y Navegación Aérea (Spanish Airports and ATC)
AER	Approach End Runway
AERA	Automated En Route ATC
AERO	Aerodrome
AERO	Aviation Emissions and Evaluation of Reduction Options Model (NLR)
AES	Aircraft Earth Station
AEZT	Actual End of De-icing Time
AF	Airways Facilities
AFAS	Aircraft in the Future Air Traffic Management System (EC 5th Framework Programme)
AFB	Air Force Base
AFC	ATC Frequency Change (Service)
AFCS	Automatic Flight Control System
AFDM	Augmented Flight Deck Model
AFIS	Airborne/Aerodrome Flight Information Service
AFISO	Aerodrome Flight Information Service Officer
AFIZ	Aerodrome Flight Information Zone
AFL	Actual Flight Leve
AFM	Aircraft Flight Manual
AFMS	Advanced Flight Management System
AFMU	Airspace and Flow Management Unit
AFN	ATS Facilities Notification (PETAL DLIC Application)
AFNOR	Association Française de Normalisation
AFO	Airport Fire Officer
AFP	ATC Flight Plan Proposal
AFS	Advanced Function Simulator (DFS)
AFS	Air Force Station
AFS	Aircraft Fuel Supply
AFS	Auto Flight System (MD-11)
AFSS	Automated Flight Service Station
AFTN	Aeronautical Fixed Telecommunications Network
AFUA	Advanced Flexible Use of Airspace
AGAS	Action Group for ATM Safety (EUROCONTROL)
AGATE	Advanced General Aviation Transport Experiment
AGC	Air-Ground Cooperative ATS (EEC)
AGC	Air-Ground Co-ordination
AGDL	Air-Ground Data Link
AGDLGMS	Air-Ground Data Link Ground Management System
AGFA	Air-Ground Functional Architecture
AGHT	Actual Ground Handling Start Time
AGI	Air Ground Integration
AGIFORS	The Airline Group of the International Federation of Operational Research Societies
AGL	Above Ground Level
AGL	Aerodrome Ground Lighting
AGNIS	Azimuth Guidance Nose-in-Stand
AGS	ADS-B Ground Station
AH	Alert Height
AHDG	Assigned Heading
AHP	Army Heliport
AHRS	Attitude-Heading Reference System
AHS	American Helicopter Society
AIA	Aerospace Industries Association
AIAA	American Institute of Aeronautics and Astronautics
AIAT	Actual Initial Approach Fix Time
AIBT	Actual In-Block Time
AIC	Aeronautical Information Circular
AICM	Aeronautical Information Conceptual Model
AID	Aircraft Identification (24-bit Address)
AIDA	Aeronautical Integrated Data Exchange Amsterdam
AIDA	Airport Integrated Datalink Working Group (EUROCONTROL)
AIDC	ATC Inter-Facility Data Communication
AILS	Airborne Information System for Lateral Spacing
AIM	Aeronautical Information Management
AIM	Aeronautical Information Manual
AIM	Air Traffic Flow and Capacity Management Information Message
AIM	Assessing the Impact of Automation on Mental Workload (EUROCONTROL)
AIM-FANS	Airbus Interoperable Modular - FANS (FANS)
AIM-l	Assessing the Impact of Automation on Mental Workload (Long Version)
AIMS	Airplane Information Management System (Boeing 777)
AIM-s	Assessing the Impact of Automation on Mental Workload (Short Version)
AINSC	Aeronautical Industry Service Communication
AIP	Aeronautical Information Publication
AIR	Air Control Rating Endorsement
AIR	Airborne
AIRAC	Aeronautical Information Regulation and Control
AIRCOM	Aircraft Communications
AIREP	Air-Report
AIRM	ATM Information Reference Model
AIRMET	En-route Weather Information
AIRPORT-G	Airport Integrated R&D Project for Operational Regulation of Traffic Guidance
AIRSIM	Multi-Cockpit Simulator (NLR)
AIS	Aeronautical Information Services (EUROCONTROL)
AISC	Aeronautical Industry Service Communication
AIT	Advanced Intelligent Tape (Recording Media)
AIXM	Aeronautical Information Exchange Model
ALA	Authorized Landing Area
ALAGS-AV	Airport Local Air Quality Studies - ArcView (EUROCONTROL)
ALARP	As-Low-As-Reasonably-Practible
ALCS	Aerodrome Lighting Control and Monitoring System
ALDT	Actual Landing Time
ALDT	Actual Landing Time
ALERFA	Alert Phase
ALF	Auxiliary Landing Field
ALLA	ATN Lower Layer Access (PETAL)
ALOR	Automatic Label Overlap Resolution
ALPA	Airline Pilots Association
ALR	Alert/Alerting
ALRS	Alerting Service
ALRT	Alert Message Attribute (CPDLC)
ALT	Altitude
ALTN	Alternate
AM	Airport Manager
AM	Airspace Manager
AM	Arrival Management
AM	Arrival Manager (PHARE)
AMA	Area Minimum Altitude
AMAN	Arrival Manager
AMASS	Airport Movement Area Safety System
AMC	Acceptable Means of Compliance
AMC	Airspace Management Cell
AMC	ATC Microphone Check
AMC	Avionics Maintenance Conference
AMCC	ARTCC Monitor and Control Center
AMCP	Aeronautical Mobile Communication Panel (ICAO)
AMD	Advisory Map Display
AMER	Aanvullend Milieu Effect Rapportage (Dutch Environment Study)
AMHS	Aeronautical Message Handling System
AMI	Airline Modifiable Information
AMIS	Automatic Meteorological Information System
AMLCD	Active Matrix Liquid Crystal Display
AMM	Airport Moving Map
AM-MSK	Amplitude Modulated Minimum Shift Keying (VDL Mode 1)
AMOC	ATFM Modelling Capability
AMOSS	Airline Maintenance and Operation Support System
AMS	Aeronautical Mobile Service
AMS	Alenia Marconi Systems (SELEX)
AMSL	Above Mean Sea Level
AMSS	Aeronautical Mobile Satellite Service
AMTE	Aviation Multi-Tasking Environment
AN	Data Analysis Software of CTAS
ANA	Aeroportos de Portugal (Airports of Portugal)
ANC	Air Navigation Commission
A-NDLS	Airborne NDLS
ANETO	EADS Ground Test Platform for End-to-End Testing of ATN Applications
ANFS	Aircraft Network and File Server
ANGB	Air National Guard Base
ANM	Air Traffic Flow and Capacity Management Notification Message
ANOVA	Analysis of Variance (Tool)
ANP	Achieved/Actual Navigation Performance
ANS	Air Navigation Service
ANS	Air Navigation System
ANS-CR	Air Navigation Services of the Czech Republic
ANSI	American National Standards Institute
ANSIR	Advanced Navigation System Inertial Reference
ANSP	Air Navigation Service Provider
ANWS	Air Navigation and Weather Services (Taiwan)
AO	Aircraft Operator
AOA	ACARS over AVLC
AOA	Airline Operational Communications on AVLC
AOA	Angle Of Attack
AOBT	Actual Off-Block Time
AOC	Aeronautical Operational Communications
AOC	Aeronautical Operational Control
AOC	Aircraft Operating Company
AOC	Aircraft Operations Centre
AOC	Airline Operational Centre
AOC	Airline Operational Communications
AOC	Airline Operational Control (Centre)
AOC	Airline Operations Control
AOC	Assumption of Control
AOCS	Air Operations Control Station
AOE	Airport/Aerodrome of Entry
AOG	Aircraft-On-Ground
AOM	Aircraft Operator Manual
AOM	Airside Operations Manager
AOP	Airport Operation Panel
AOP	Airport Operational Plan
AOP	Airport Operations Domain (EUROCONTROL)
AOP	Autonomous Operations Planner
AOPA	Aircraft Owners and Pilots Association
AOPG	Aerodrome Operations Group (ICAO)
AOR	Area of Responsibility
AOS	FAA Operational Support Service
AOT	Airport Operations Team
AP	Action Plan (FAA-EUROCONTROL Working Groups)
AP	Arrival Procedure
AP	Avionics Package
APAPI	Abbreviated Precision Approach Path Indicator
APATSI	Airports/Air Traffic Systems Interface
APB	Airspace Policy Body
APC	Aeronautical Passenger Communications
APC	Area Positive Control
APCH	Approach
APDU	Application Protocol Data Unit
APERO	Avionics Prototyping Environment for Research and Operations (NLR)
API	Application Program Interface
APL	ATC Flight Plan
APLN	Approach Planner
APM	Associate Program Manager
APMC	Associate Program Manager for Contracting
APMGC	Associate Program Manager for General Counsel
APML	Associate Program Manager for Logistics
APMNI	Associate Program Manager for NAS Implementation
APMO	Associate Program Manager for Operations
APMP	Associate Program Manager for Procedures
APMQ	Associate Program Manager for Quality
APMR	Associate Program Manager for Requirements
APMSE	Associate Program Manager for System Engineering
APMT	Associate Program Manager for Test
APN	Apron Control
APOC	Airport Operations Centre
APP	Approach Control (Centre)
APR	Airport Operations Programme (EUROCONTROL)
APR	Automatic Position Reporting
APT	Airport
APT	Airport Through-put (EUROCONTROL)
APTM	Airport Traffic Management
APTMS	Airport Traffic Management System
APU	Auxiliary Power Unit
APV	Approach Procedure with Vertical Guidance
APW	Area Proximity Warning
ARAC	Aviation Rulemaking Advisory Committee
ARAMIS	Advanced Runway Arrivals Management to Improve airport Safety and Efficiency
ARB	Air Reserve Base
ARC	Archive System
ARCCOD	Aircraft Code (IATA Aircraft Type)
ARCID	Aircraft Identification
ARCOS	Arrival Co-ordination System
ARD	Approach Reference Datum
ARD	FAA Research and Development
ARDEP	Analysis of Research & Development in EUROCONTROL Programmes
ARDT	Actual Ready Time (for Movement)
ARES	Airspace Reservation
ARIBA	ATN System Safety Criticality Raises Issues in Balancing Actors Responsibility
ARINC	Aeronautical Radio Incorporated
ARN	Aeronautical Route Network
ARO	ATS Reporting Office
ARP	Aerospace Recommended Practices
ARP	Airport Reference Point
ARR	Arrival
ArrSP	Arrival Sequence Planner
ARSA	Airport Radar Service Area
A-RSN	Advanced Runway Safety Net
ARSR	Air Route Surveillance Radar
ART	Alert Response Time (Surveillance)
ARTAS	ATM Radar Tracker and Server
ARTCC	Air Route Traffic Control Centers
ARTS	Aerodrome Real-time Simulator (SICTA)
ARTS	Automated Radar Terminal System
ARZT	Actual Ready for De-icing Time
AS	Air Space (NARSIM Server)
AS	Airborne Surveillance
ASA	Aviation Safety Alliance
ASAP	Airport Scenario Analysis Package (NLR)
ASAP	Automated Support for Air Traffic Control Programme
ASAS	Airborne Separation Assurance (Assistance) System
ASAT	Actual Start-up Approval Time
ASAT	Airspace Simulation and Analysis for TERPS
ASBT	Actual Start Boarding Time
ASCB	Avionics Standard Communication Bus
ASD	Aircraft Situational Display
ASDA	Accelerate Stop Distance Available
ASDE	Airport Surface Detection Equipment
ASDI	Aircraft Situation Display to Industry (U.S.)
ASE	Application Service Element
ASEP	Airborne Separation
ASGARD	Autonomous Simulation of Ground Movements, Arrival and Departure (DLR)
ASI	Airspeed Indicator
ASIC	Application-Specific Integrated Circuit
ASL	Above Sea Level
ASM	Active Shadow Mode (Test)
ASM	Airspace Management
ASM	Altimeter Setting Message
ASMAP	Approach Sequencing, Metering and Advisory Processing
ASME	American Society of Mechanical Engineers
A-SMGCS	Advanced Surface Movement Guidance and Control System
ASN	Abstract Syntax Notification (Data Specification Standard)
ASOR	Allocation of Safety Objectives and Requirements
ASOS	Automated Surface Observation System
ASP	Arrival Sequencing Program
ASPA	Airborne Spacing
ASPP	Aeronautical Fixed Service and System Planning Panel
ASR	Airport Surveillance Radar
ASR	ATM-System Requirement
ASRS	Aviation Safety Reporting System
ASRT	Actual Start-up Request Time
ASS	Assistant
ASSAP	Airborne Surveillance and Separation Assurance Processing
ASSIST	Acknowledge - Separate - Silence - Inform - Support - Time
ASSN	Airport Surface Safety Nets
ASSTAR	Advanced Safe Separation Technologies and Algorithms
ASTERIX	All Purpose Structured EUROCONTROL Automated Radar Information Exchange (EUROCONTROL)
ASTRA	Airport Surveillance Tracker
AT	Air Transport (NLR Division)
ATA	Actual Time of Arrival
ATA	Air Traffic Association
ATA	Air Transport Association
ATAC	Air Transport Association of Canada
ATAG	Air Transport Action Group
ATAP	ATM & Airports (NLR Department)
ATC	Air Traffic Control
ATCAA	Air Traffic Control Assigned Airspace
ATCC	Air Traffic Control Centre
ATCF	Cockpits & Flight Operations (NLR Department)
ATCo	Air Traffic Controller
ATCOD	Air Traffic Occurence Database
ATCoDis	Air Traffic Controller Display (NARSIM Component)
ATCRBS	ATC Radar Beacon System
ATCSCC	ATC System Command Center
ATCT	Airport Traffic Control Tower
ATCU	Air Traffic Control Unit
ATD	Actual Time of Departure
ATF	Aerodrome Traffic Frequency
ATF	Aeronautics Task Force
ATFCM	Air Traffic Flow and Capacity Management
ATFM	Air Traffic Flow Management
ATHOS	Airport Tower Harmonised Controller System (European Commission Project)
ATI	Air Traffic Implementation (EEC Business Area)
ATI	Air Transport Indicator
ATIDS	Airport Target Identification System
ATIF	ATN Trials Infrastructure
ATIS	Automatic Terminal Information Service
ATIS-B	Automatic Terminal Information Service Broadcast
ATLAS	Abbreviated Test Language for Avionics Systems
ATM	Air Traffic Management
ATM	Asynchronous Transfer Mode
ATM2000+	ATM Strategy for the Years 2000+ (EUROCONTROL Programme)
ATMDC	ATM Development Centre
ATMDS	Air Traffic Management Demonstration System
ATMOS	Air Traffic Management and Operations Simulator (DLR)
ATMSDI	Air Traffic Management System Development and Integration
ATN	Aeronautical Telecommunications Network
ATNP	Aeronautical Telecommunication Network Panel (ICAO)
ATNSI	ATN Systems Incorporated
ATO	Actual Time Over
ATO	Air Traffic Operations
AT-One	Strategic ATM Research Alliance between NLR and DLR
ATOPS	A-SMGCS Testing of Operational Procedures by Simulation
ATOS	Airport Traffic Optimisation and Simulation (DSNA)
ATOT	Actual Take-off Time
ATR	Acceptance Test Review
ATR	Air Traffic Requirements
ATR	Air Transport Radio
ATS	Air Traffic Server (NARSIM Component)
ATS	Air Traffic Services
ATS	Along Track Separation
ATS	Apron and Tower Simulator (DLR)
ATSA	Airborne Traffic Separation Assurance
ATSA	Airborne Traffic Situational Awareness
ATSAW	Air Traffic Situational Awareness
ATSB	Australian Transport Safety Bureau
ATSC	ATS Communications
ATSEP	Air Traffic Safety Electronics Personnel
ATSEP	Air Traffic Safety Electronics Personnel
ATSI	Air Transport Safety Institute (NLR Department)
ATS-MHS	ATS Message Handling System
ATSP	Air Traffic Service Provider
ATSU	Air Traffic Services Unit
ATTAS	Advanced Technologies Testing Aircraft System (DLR)
ATTT	Actual Turn-around Time (AOBT - AIBT)
ATV	Aircraft Transit View
ATYP	Aircraft Type (ICAO Aircraft Type)
ATZ	Aerodrome Traffic Zone
AU	Airspace User
AudioLAN	Innovative Internet Technology-based Voice Communication System (EUROCONTROL)
AUO	Airspace User Operations
AUP	Airspace Use Plan
AUSRIRE	All Union Scientific Research Institute of Radio Equipment (former Soviet agency)
AUTH	Authorized
AUW	All-up Weight
AUX	Auxiliary
AUX	Auxiliary Mass Storage Unit
AVA	Adaptation Validation and Analysis CSCI
A-VDGS	Advanced Visual Docking Guidance System
AVENUE	ATM Validation Environment for Use towards EATMS
AVG	Average
AVLC	Aviation VHF Link Control (VDL)
AVMS	Advanced Vehicle Management System
AVOL	Aerodrome Visibility Operational Level
AVP	Approximate Vertical Profile
AVPAC	Aviation VHF Packet Communications
AVSSSG	ATS Voice Switching and Signalling Study Group (ICAO)
AVT	ADS-B/TIS-B Validation Platform (EUROCONTROL)
AVTECH	AVTECH Sweden AB (Aviation Technology Consultants)
AWIB	Aerodrome Weather Information Broadcast
AWLU	Aircraft Wireless LAN Unit
AWOP	All Weather Operations Panel (ICAO)
AWOS	Automated Weather Observing System
AWY	Airway
AXIT	Actual Taxi-in Time
AXOT	Actual Taxi-out Time
AZ	Azimuth
B
B	Baseline
B	Bravo Time Zone (UTC + 2 hrs.)
BA	Business Aviation
BADA	Base of Aircraft Performance Data (EUROCONTROL)
BAe	British Aerospace
BASI	Bureau of Air Safety Investigation
BATAP	Ground system protocol to access SITA
BC	Back Course
BCA	Boeing Commercial Airplanes
BCAS	Beacon Collision Avoidance System: forerunner of TCAS
BCM	Back Course Marker
BCN	Beacon
BCOB	Broken Clouds or Better
BCS	Binary Check Sum
BCST	Broadcast
B-DAP	Broadcast DAP
BDM	Block Data Message
BDRY	Boundary
BDS	comm-B Data Selector
BDT	Banc de Test (DSNA)
BEA	Bureau d'Enquêtes Accidents
BETA	Operational Benefit Evaluation by Testing A-SMGCS (FP5)
BFS	Building and Facilities Support (EUROCONTROL)
BGAS	Baangebruiks Advies Systeem (Runway Allocation Assistant System)
BIS	Boundary Intermediate System
BITE	Built-In-Test-Equipment
BLDG	Building
BM	Back Marker
BND	Big Negative Dither
BNF	Backus-Naur Form
BPS	Bits Per Second
BRG	Bearing
B-RNAV	Basic RNAV
B-RSN	Basic Runway Safety Net
BSC	Braking and Steering Cues
BSI	British Standards Institution
BTV	Brake to Vacate
BUP	Back-up (Procedure)
BZO	Beperkt Zicht Omstandigheden (Limited Visibility Conditions)
C
C	Charlie Time Zone (UTC + 3 hrs.)
C&P	Crossing and Passing
C/AFT	CNS/ATM Focused Team (Boeing)
C/B	Cost/Benefit
C/S	Client/Server
CA	Capacity
CA	Consortium Agreement
CAA	Cargo Airline Association
CAA	Civil Aeronautics Administration (Taiwan)
CAA	Civil Aviation Authorities
CAAS	Controller Assigned Airborne Separation
CAASD	Center for Advanced Aviation System Development (MITRE Corporation)
CAATS	Co-operative Approach to ATS (6th Framework)
CAB	Civil Aeronautics Board
CAD	Computer Aided Design
CADC	Central Air Data Computer
CADF	Central Airspace Data Function
CAER	Computer Assistance for En-route ATC
CAERAF	Common American European Reference ATN Facility
CAFT	CNS/ATM Focused Team (Boeing)
CAISS	Common ATM Info State Space (RAMS)
CAM	Computer Aided Manufacturing
CAMACA	Commonly Agreed Methodology for Airport Airside Capacity Assessment (EUROCONTROL)
CANSO	Civil Air Navigation Services Organisation
CAP	Controller Access Parameters (DL)
CAPAN	Capacity Analyser (EUROCONTROL)
CAPEX	Capital Expenditure
CARD	CNS Applications Research & Development
CARE	Co-operative Actions of Research & Development in EUROCONTROL
CARS	Community Aerodrome Radio Station
CARS	Controller Acceptance Rating Scale
CAS	Calibrated Air Speed
CASA	Civil Aviation Safety Authority
CASA	Computer Assisted Slot Allocation
CASCADE	ADS-B Implementation Co-ordination Programme for Europe (EUROCONTROL)
CAST	Commercial Aviation Safety Team
CAST	Comprehensive Airport Simulation Technology (ARC Aachen)
CASTA	Communication and Surveillance for the Test of AFAS (ATM Ground Test Bed)
CAT	Category
CAT	Clear Air Turbulence (high altitude turbulence encountered where no clouds are present)
CAT I	Category 1 flight conditions (200 ft decision heigt, RVR 2600+ ft)
CAT II	Category 2 flight conditions (100 ft desicion height, RVR 1200+ ft)
CAT IIIA	Category 3A flight conditions (no desicion height minimum, RVR 700+ ft)
CAT IIIB	Category 3B flight conditions (no desicion height minimum, RVR 150+ ft)
C-ATM	Co-operative Air Traffic Management
C-ATSU	Controlling ATSU
CAUTRA	Coordination Automatique du Trafic Aérien
CAVA	Concerted Action on Validation of ATM Systems
CB	Cumulonimbus
CBA	Cost-Benefit Analysis
CBA	Cross Border Area
CBT	Computer Based Training
CC	Control Component
CCA	Clear Channel Assignment
CCB	Configuration Control Board
CCC	Common Core Conten
CCD	Cockpit Control Display
CCD	Configuration Control Directive
CCD	Continuous Climb Departure
CCI	Co-Channel Interference (VDL)
CCIS	Closed Circuit Information System (LVNL)
CCITT	Comité Consultatif International Télégraphique et Téléphonique (ITU)
CD	Compact Disc
CD&R	Conflict Detection and Resolution
CD&R	Conflict Detection and Resolution
CDA	Continuous Descent Approach
CDA	Current Data Authority
CDAC	CDM in Adverse Conditions
CDB	Central Data Base
CDC	Clearance Delivery Controller
CDD	Clearance Delivery Dispatcher
CDF	Central De-icing Facility
CDG	Charles-de-Gaulle (Paris Airport)
CDI	Course Deviation Indicator
CDLS	Contractor Depot Logistics Support
CDM	Collaborative Decision Making
CDM-A	CDM Airport
C-DPI	Cancel Departure Planning Information Message
CDR	Conditional Route
CDR	Continuous Data Recording
CDR	Critical Design Review
CDRL	Contract Data Requirements List
CDT	Central Daylight Time
CDTI	Cockpit Display of Traffic Information
CDU	Control and Display Unit
CEATS	Central European Air Traffic Services (EURCONTROL)
CEC	Commission of the European Communities
CEFR	CDTI Enhanced Flight Rules
CEIL	Ceiling
CEM	Collaborative Environment Mangement
CEN	Comité Européen de Normalisation
CENA	Centre d'Études de la Navigation Aérienne
CENELEC	Comité Européen de Normalisation Electrotechnique
CERAP	Combined Center/Radar Approach Control
CES	Cancel Estimate
CF	Certainty Factor (ADS-B)
CF	Control Function
CFIT	Controlled Flight Into Terrain
CFL	Cleared Flight Level
CFMU	Central Flow Management Unit
CFR	Code of Federal Regulations
CG	Center of Gravity
CGA	Clear and Graded Area
CGAS	Coast Guard Air Station
CGL	Circling Guidance Lights
CGW	Communication Gateway
CH	Channel
CH	Critical Height
CHAIN	Controlled and Harmonised Aeronautical Information Network
CHG	Change (Modification Message)
CHI	Computer Human Interface
CI	Communication Interface
CI	Configuration Item
CIC	Clearances and Information Communications (Service)
CIDIN	Common ICAO Data Interchange Network
CIP	Convergence and Implementation Programme (EUROCONTROL)
CISM	Critical Incident Stress Management
CISPR	Comité International Spécial des Perturbations Radioéléctriques
CISS	Central Information System Schiphol (AAS)
CLD	Clearance Delivery
CLD	DCL Clearance Message (Message in the DCL Service)
CLFL	Clearance Limit Flight Level
CLNP	Connectionless Network Protocol (ATN)
CLNS	Connectionless Network Service
CLR	Clearance
CLTP	Connectionless Transport Protocol
CM	Communications Manager
CM	Configuration Management
CM	Context Management
CMA	Common Mode Analysis
CMA	Context Management Application
CMC	Central Maintenance Computer
CMD	Control and Monitoring Display
CMF	Configuration Management Facility
CMLS	Contractor Maintenance & Logistics Support
CMMI	Capability Maturity Model Integration
CMNPS	Canadian Minimum Navigation Performance Specific
CMO	Configuration Management Organization
CMS	Common Modular Simulator
CMU	Communications Management Unit
CND	Co-operative Network Development (EUROCONTROL)
CNF	Computer Navigation Fix
CNL	Cancel (Message)
CNL	Flight Plan Cancellation
CNMAC	Critical Nearm Mid Air Collision
CNS	Communication Navigation Surveillance
COD	SSR Code Assignment (Message)
CODA	Central Office for Delay Analysis (EUROCONTROL)
COF	Change of Frequency (a G/G Co-ordination Message)
COFU	Collaborative Management of Flight Updates
COLA	Complexity Light Analyser (EUROCONTROL)
COM	Communications
COMAO	Composite Military Air Operations
COMLO	Compass Locator
COMM	Communications
COMPAS	Computer Oriented Metering Planning and Advisory System
CONOPS	Concept of Operations
CONT	Continuous
CONUS	Continental U.S.
COOPATS	(Towards) Co-operative ATS (EATMP - EUROCONTROL)
COOR	Co-ordination
COORD	Co-ordinates
COP	Change Over Point
COP	Co-ordination Point
CORA	Conflict Resolution Assistant (EUROCONTROL)
CORBA	Common Object Request Broker Architecture
CORDIS	Community Research & Development Information Service
CORE	Core Requirements for ATM Working Positions Project (EUROCONTROL)
CORR	Corridor
COSAAC	Common Simulator to Assess ATFM Concepts (EUROCONTROL)
COTRAC	Common Trajectory Co-ordination Service
COTREC	Continuity of TREC Vectors
COTS	Commercial Off-The-Shelf
COTS	Connection-Oriented Transport Service
CP	Central Processor
CP	Command Post
CP	Conflict Probe (NLR)
CPA	Closest Point of Approach (TCAS)
CPC	Controller Pilot Communications
CPD	CEATS Programme Directorate (EUROCONTROL)
CPDLC	Controller Pilot Datalink Communication
CPDSP	Collaborative Pre-Departure Sequence Planning
CPE	CTAS Processing Equipment HWCI
CPFS	Computer Program Functional Specification
CPFSK	Continuous Phase Frequency Shift Keying
CPL	Current Flight Plan (Message)
CPR	Compact Position Reporting
CPS	Central Processing Station (System)
CPSQ	Collaborative Predeparture Sequence
CPU	Central Processing Unit
CQM	Communication and Quality Management (EUROCONTROL)
CR	Common Requirements
CR	Crossing Restrictions
CRAM	Conditional Route Availability Message
CRC	Control and Reporting Centre
CRC	Cyclic Redundancy Check (VDL)
CRCT	Collaborative Routing Co-ordination Tool (MITRE)
CRD	Co-ordinated Requirements Determination
CRD	Conflict-Risk Display
CRDA	Converging Runway Display Aid (ATM Tool)
CRDS	CEATS Research and Development Services (EUROCONTROL)
CRIDA	Reference Centre for Research, Development and Innovation in ATM
CRISD	Computer Resources Integrated Support Document
CRM	Cockpit Resource Management or Crew Resource Management
CRNA	Centres Régionaux (En Route) de la Navigation Aérienne
CROS	Commissie Regionaal Overleg Schiphol (Commission for Regional Consultation Schiphol)
CROS	Crossing Conflict
CROSS	Crossing
CRS	Course
CRSD	Colour Raster Scan Display
CS	Callsign
CS	Certification Specification (EASA)
CS	Community Specification
CS	Conflict Solving (Controller Activity)
CSBT	Co-ordinated Shared Business Trajectory
CSC	Computer Software Component
CSCD	CTAS Software Change Document
CSCI	Computer Software Configuration Item
CSCR	CTAS Software Change Request
CSMA/CD	Carrier Sense Multiple Access with Collision Detection
CSOM	Computer Systems Operators Manual
CSOR	Current Systems Operations Room (NATS)
CSPA	Closely Spaced Parallel Approach
CSPDU	CEATS Strategic Planning and Development Unit (EUROCONTROL)
CST	Central Standard Time
CSTR	Constraint
CSU	Computer Software Unit
CT	Co-operative Tools (PHARE)
CTA	Calculated Time of Arrival (at IAF)
CTA	Control Area
CTA	Controlled Time of Arrival
CTAF	Common Traffic Advisory Frequency
CTAS	Centre TRACON Automation System
CTC	Common Trajectory Co-ordination
CTL	Control
CTMO	Centralised Traffic Management Organisation Concept
CTO	Controlled Time Over
CTOT	Calculated Take-Off Time
CTR	Control Region
CTR	Control Tower Region
CTR	Control Zone
CTRP	CDM Turn-around Process
CTS	Coded Time Source
CTS	Conformance Test Suite
CU	Control Unit
CV	Coverage Volume (Surveillance)
CV	Curriculum Vitae
CVFR	Controlled VFR
CVOR	Conventional VOR
CVR	Cockpit Voice Recorder
CWP	Controller Working Position
CWT	Code Walk-Through
D
D	Danger Area
D	Day
D	Deliverable
D	Delta Time Zone (UTC + 4 hrs.)
D	Radar Developmental/Data Controller (Planning Controller)
D/L	Datalink
D2	Direct-to
D8PSK	Differentially Encoded 8-Phase Shift Keying
DA	Decision Altitude
DA	Descent Advisor
DAA	Detect and Avoid (Drones)
DAARWIN	Distributed ATM Architecture based on RNAV Workstations, Intelligent Tools and Networks (DSNA)
DACS	Digital Aeronautical Chart Supplement
DADC	Digital Air Data Computer
DADI	Datalink of Aircraft Derived Information
DAG-TM	Distributed Air-Ground Traffic Management (NASA Ames)
DAN	Data Analysis CSCI
DAP	Directorate ATM Programmes (EUROCONTROL)
DAP	Downlink of Airborne/Aircraft Parameters (ADS)
DARPA	Defense Advanced Research Projects Agency (USA)
DARTS	Decision Aid for Real-time Synchronisation (EUROCONTROL)
DARTS	Departure and Arrival Traffic Management System (DLR)
DAS	Directorate ATM Strategies (EUROCONTROL)
DASA	Deutsche Aerospace AG
DASR	Department of ATM Systems Research
D-ATIS	Digital Automatic Terminal Information Service (ACARS)
D-ATSU	Downstream ATSU
DAVINCI	Departure and Arrival Integrated Management System for Co-operative Improvement of Airport Traffic Flow
DCB	Demand and Capacity Balancing
DCDS	Dynamic Control Dialogue Service
DCDU	Datalink Control Display Unit
DCIA	Dependent Converging Instrument Approach
DCL	Departure Clearance (CPDLC/ACARS)
DCMS	Dynamic Capacity Management Schiphol
DCN	Document Change Notice
DCO	Departure Controller
DCS	Departure Control System
DCS	Designated Certification Specialist
DCT	Direct (Route)
DDA	Downstream Data Authority
dDCB	Dynamic Demand and Capacity Balancing
DDF	Design Definition File
DDM	Data Distribution Management
DDP	Declaration of Design and Performance
DDR	Demand Data Repository
DDSNA	División de Desarrollo del Sistema de Navegación Aérea (AENA Division)
DECO	De-icing Co-ordinator
DECT	Digital Enhanced Cordless Telecommunications
DEF	Discrete Emergency Frequency
DEFAMM	Demonstration Facilities for Airport Movement Management
DEG	Degree
DEI	De-Icing
DEL	Delivery Controller
DELP	Distributed Environment for Low-Fidelity Prototyping (SICTA)
DEP	Departure (Message)
DEP	Departure Control
DEPARDIS	Departure Manager Display (AFAS HMI)
DER	Departure End of Runway
DERA	Defence Evaluation and Research Agency
DES	Descent
DES	De-suspension Message
DEST	Destination
DETRESFA	Distress Phase
DEU	Display Electronics Unit
DEVAM	Development of an EATMP Validation Methodology
DEWIZ	Distance Early Warning Identification Zone
DF	Direction Finder
DF	Downlink Field (ADS-B)
DFDAU	Digital Flight Data Acquisition Unit
DFDR	Digital Flight Data Recorder
DFI	Distance from Intersection
D-FIS	Data Link Flight Information Services
DFL	Division Flight Level
DFL	Dynamic Flight Leg
DFS	Deutsche Flugsicherung
DG	Directorate General (EC)
DGAC	Direction Générale de l'Aviation Civile
DGB	Directoraat-Generaal Bereikbaarheid
DGLM	Directoraat-Generaal Luchtvaart en Maritieme Zaken (Directorate General for Civil Aviation and Maritime Affairs)
DGNSS	Differential GNSS
D-GPS	Differential Global Positioning System
DGS	Docking Guidance System
DGTL	Directoraat Generaal Transport en Luchtvaart (Directorate General for Transport and Civil Aviation)
DH	Decision Height
DHS	Department of Homeland Security (U.S.)
DIA	Data Information and Analysis
DID	Data Item Description
DIF	Data Interchange Format
DIFT	Departure Instruction from Tower
DIS	Distributed Interactive Simulation
DIST	Distance
DIV	Diversion
DJF	Design Justification File
DL	Datalink
DLA	Delay (Message)
DLIC	Datalink Initiation Capability
DLL	Data Link Logon
DLM	Milestone Deliverable
DLPU	DL Processing Unit
DLR	Deutsches Zentrum für Luft- und Raumfahrt
DLS	Data Link Service (VDL)
DLT	Task Deliverable
DM	Data Manager CSCI
DM	Departure Manager (PHARE)
DMA	Decision Making Aids
DMA	Dynamic Mobile Area
DMAN	Departure Manager
DME	Distance Measuring Equipment
DMEAN	Dynamic Management of the European Airspace Network
DMSO	Defense Modeling and Simulation Office (DoD)
DMU	Data Management Unit
DNA	Direction de la Navigation Aérienne
DNM	Directorate Network Management
DO	Direction des Opérations
DOC	Department of Commerce (U.S.)
DoD	Department of Defense (U.S.)
DOD	Detailed Operational Description
DoDAF	Department of Defense Architecture Framework
DOF	Date of Flight
DOF	Degree of Freedom
DOM	Domestic
DOORS	Dynamic Object-Oriented Requirements Management System
DOP	Daily Operational Plan
D-OPS	Director Operations
D-ORIS	Data Link Operational En Route Information Service
DoS	Directory of Services (VHF)
DOT	Department of Transportation (U.S.)
D-OTIS	Data Link Operational Terminal Information Service
DOVE	Datalink Operational Validation Experiments (EUROCONTROL EATMP AGC Programme)
DOW	Description of Work
DP	Departure Procedure
DP	Dynamic Planner CSCI
DPA	Delegation of Procurement Authority
DPA	Dependent Parallel Approach
DPAT	Detailed Policy Assessment Tool (MITRE-CAASD)
DPI	Departure Planning Information (Message)
DPM	Data and Presentation Management
DPS	Data Processing System
DPSK	Differential Phase Shift Keying
DQT	Design Qualification Test
DR & A	Data Reduction and Analysis
DRD	Document Requirements Definition
DRE	Displaced Runway End
DRF	Data Recording Facility
DRL	Data Requirements List
DRP	Data Record/Playback CSCI
DRR	Deployment Readiness Review
D-RVR	Data Link Runway Visual Range
DSC	Downstream Clearance
D-SIGMET	Data Link Significant Meteorological Information
DSNA	Direction des Services de la Navigation Aérienne (French Air Navigation Services)
DSP	Departure Sequencing Program
DSR	Display System Replacement
DSSS	Direct Sequence Spread Spectrum
DST	Decision Support Tool
DSU	Data Servicing Unit
DSUM	Data Summary (Software)
DT	Decision Time
DT & E	Development Test & Evaluation
D-TAXI	Data Link Taxi Clearance Service
DTDM	Deterministic Time Division Multiplexing
DTE	Data Terminal Equipment
DTI	Direction de la Technique et de l' Innovation (Technology and Innovation Department of DSNA)
DUATS	Direct User Access Terminal System
DUR	Desired/Undesired Signal Ratio (VDL)
DVOR	Doppler VOR
DYNAV	Dynamic Route Availability
DYP	Dynamic Flight Plan
DYSIM	Dynamic Simulator
E
E	East
E	Echo Time Zone (UTC + 5 hrs.)
E	Evaluation
EACAC	Evolutionary Air-Ground Cooperative ATM Concepts
EACCC	European Aviation Crisis Co-ordination Cell
EACI	EATMS Architecture and CNS Infrastructure Sub-group
EACM	Enhanced Airfield Capacity Model (MITRE)
EAD	European AIS Database (EUROCONTROL)
EADI	Electronic Attitude Direction Indicator
EADS	European Aeronautic Defence and Space Company
EAEA	European ATM Enterprise Architecture
EARTS	En-route Automated Radar Tracking System
EASA	European Aviation Safety Agency
EASIE	Enhanced ATM and Mode-S Implementation in Europe
EASO	European Aviation Suppliers Organisation
E-ASR	Emulated Airport Surveillance Radar (NARSIM)
EASY	Environnement Applicatif sur Ivy (DSNA)
EAT	Estimated Approach Time
EATCHIP	European ATC Harmonisation and Integration Programme
EATM	European Air Traffic Management (EUROCONTROL)
EATMA	European ATM Architecture
EATMN	European Air Traffic Management Network
EATMP	European Air Traffic Management Programme (EATCHIP)
EATMS	European ATM System
EATRADA	European ATM Research And Development Association
eAUP	Executive Approved User Plan
EC	European Commission
EC	Executive Controller
ECAC	European Civil Aviation Conference
ECARDA	European Coherent Approach For RTD In ATM
ECAS	Enhanced Collision Avoidance System
ECIP	European Convergence and Implementation Plan
eCODA	Enhanced CODA (EUROCONTROL CODA Data Website)
ECR	EATMS Concept and Requirements Sub-group
E-CRM	Enhanced Collision Risk Modelling (SICTA)
ECZT	Estimated Commencement of De-icing Time
ED78A	EUROCAE Document on use of ATS
EDA	En-route Descent Advisor (FAA)
EDD	Electronic Data Display
EDD	Equipment Description Document
eDEP	Early Demonstration and Evaluation Platform (EUROCONTROL)
EDIT	Estimated De-icing Time (EEZT - ECZT)
EDMM	Engineering and Development Management Meeting
EDP	Expedite Departure Path
E-DPI	Early Departure Planning Information (Message)
EDT	Eastern Daylight Time
EEC	EUROCONTROL Experimental Centre
EET	Estimated Elapsed Time
EETOGT	Earliest Estimated Time Over Gate
EEZT	Estimated End of De-icing Time
EFAS	Enroute Flight Advisory Service
EFB	Electronic Flight Bag
EFDP	European Flight Data Processing
EFF	Effective/Efficiency
EFIS	Electronic Flight Instrument System
EFL	Executive Flight Level
EFS	Electronic Flight Strip
EGCSA	Enhanced Ground Controller Situational Awareness
EGNOS	European Geostationary Navigation Overlay Service (European SBAS)
EHAM	Amsterdam Airport Schiphol (ICAO Code)
EHQ	EUROCONTROL Headquarters
EHSI	Electronic Horizontal Situation Indicator
EIA	Electronic Industries Alliance
EIAT	Estimated Initial Approach Fix Time
EIBT	Estimated In-Block Time
EICAS	Engine Indicating and Crew Alerting System
ELC	Effective Landing Capacity
ELDT	Estimated Landing Time
ELECTRA	Environnement Logiciel pour l'Enseignement au Contrôle du Trafic Aérien (DSNA)
ELEV	Elevation
ELM	Extended Length Message
ELVIRA	Enregistrement, Lecture, Visualisation Information Radar
ELVIRA	Environmental Light Visualisation of Impact for Research and Analysis (DSNA)
ELW	Extended Label Window
EMAS	Engineered Materials Arrestor System
EMC	Electromagnetic Compatibility
EMERG	Emergency
EMI	Electromagnetic Interference
EMM	Electronic Moving Map
EMMA	European Movement Management by A-SMGCS (EC Framework Programme)
EMOSIA	European Model for Strategic ATM Investment Analysis
EMS	Environmental Management System
EN	Enablers (FAA)
ENAV	Ente Nationale de Assistenza al Volo (Italian Air Navigation Services)
ENG	Engine
ENHANCE	European Harmonised Aircraft Noise Contour Modelling Environment
ENR	En-route
ENV	Air Traffic Services Environment System
ENVIRA	Environmental Impact Research and Analysis Package (NLR)
EOBT	Estimated/Expected Off-Block Time
E-OCVM	European Operational Concept Validation Methodology (EUROCONTROL)
EOLIA	European Pre-Operational Datalink Applications
EOTN	End of Trajectory Negotiation
EPOPEE	Étude Prospective d'un Poste d'Équipage (French Flight Simulator)
EPR	Engine-Pressure Ratio
EPZ	Enhanced Procedures Zone
ER	En-Route
ER	Essential Requirement
ERAM	En-route Automation Modernization
ERD	End Routing Domains
ERD	Equipment Requirements Document
ERIS	EATMP Reference Industry Based Simulation and Trials Platform (EUROCONTROL)
ERLC	Effective Runway Landing Capacity
EROPS	Extended Range Operations
ERZT	Estimated Ready for De-icing Time
ES	End Service (ACM Service Message)
ES	End System
ES	Extended Squitter
ESA	European Space Agency
ESAO	Environmentally Sustainable Airport Operations
ESARR	European Safety Regulatory Requirements (EUROCONTROL)
ESB	Electronic Strip Bay
ESC	European ATM Systems and Convergence (EUROCONTROL Business Division)
E-SCA	Enahanced Surface Conflict Alerting
ESCAN	Electronically Scanned
ESCAPE	EUROCONTROL Simulation Capability and Platform for Experimentation (EUROCONTROL)
ESD	Equipment Specification Document
E-SMGCS	Experimental Surface Movement Guidance and Control System (DLR)
E-SMR	Emulated Surface Movement Radar (NARSIM)
ESO	European Standards Organisation
ESP	En Route Spacing Program
ESRA	EUROCONTROL Statistical Reference Area
EST	Eastern Standard Time
EST	Estimate (Message)
ESTB	EGNOS System Test Bed (EUROCONTROL)
ESUP	EUROCAT Support System (Radar Data Processing System)
ETA	Estimated Time of Arrival
ETD	Estimated Time of Departure
ETE	Estimated Time Enroute
ETF	Enhanced Training Facility (NATS)
ETFMS	Enhanced Technical Flow Management System
ETG	Enhanced Target Generator
ETMA	Extended Terminal Manoeuvering Area
ETMS	Enhanced Air Traffic Management System
ETO	Estimated Time Over
ETOGT	Estimated Time Over Gate
ETOPS	Extended Twin-engine Operations
ETOT	Estimated Take-Off Time
ETP	Equal Time Point
ETS	European Technical Standard
ETSI	European Telecommunications Standards Institute
ETTT	Estimated Turn-around Time
ETX	Estimated Taxi-Time
EU	European Union
EUROCAE	European Organisation for Civil Aviation Equipment
EUROCONTROL	European Organisation for the Safety of Air Navigation
eUUP	European Updated Airspace Use Plan
EV	Enhanced Vision
EVA	Enhanced Visual Acquisition
EVA	EUROCONTROL Validation of A-SMGCS
EVS	Enhanced Vision System
EXIT	Estimated Taxi-In Time
EXOT	Estimated Taxi-Out Time
EXP	Expected (Datalink Status)
EZ	Ministerie van Economische Zaken
F
F	F Score - Statistic Test for Analysis of Variance
F	Foxtrot Time Zone (UTC + 6 hrs.)
F&CM	Flow and Capacity Management
F/O	First Officer
FAA	Federal Aviation Administration (U.S.)
FAALC	FAA Logistics Center
FAATC	FAA Technical Center
FAB	Functional Airspace Block
FACET	Future ATM Concepts Evaluation Tool (NASA)
FAF	Final Approach Fix
FAFEP	FANS Front-End Processor
FANOMOS	Flight Track and Aircraft Noise Monitoring System (NLR)
FANS	Future Air Navigation System
FAP	Final Approach Point
FAP	Future ATM Profile (EUROCONTROL)
FAR	Federal Aviation Regulation
FAR	Field Action Request
FARADS	Feasibility of ACAS Resolution Advisory Downlink Study (EUROCONTROL)
FAROS	Final Approach Runway Occupancy Signal
FAS	Final Approach Speed
FAST	Final Approach Spacing Tool
FAST	Full Autonomous Separation Transfer
FAST	Future A/C Systems Testbed (NLR)
FAT	Factory Acceptance Test
FAT	Final Approach Track
FBL	Fly-by-light
FBN	Fly-by-night
FBO	Fixed Base Operator
FBW	Fly-by-wire
FCA	Functional Configuration Audit
FCC	Federal Communications Commission (U.S.)
FCFS	First Come First Served (Scheduling Method)
FCOM	Flight Crew Operating Manual
FCOT	Future Concepts Team (EUROCONTROL)
FCP	Final Control Point
FCS	Flight Control System
FCS	Frame Check Sequence (VDL)
FCU	Flight Control Unit
FD	Flight Deck
FDAD	Full Digital ARTS Display
FDAU	Flight Data Acquisition Unit
FDB	Full Data Block
FDD	Flight Data Display
FDDI	Fiber Distributed Data Interface
FDIO	Flight Data Input/Output
FDM	Flight Data Management
FDM	Flight Data Message
FDMA	Frequency Division Multiple Access
FDMU	Flight Data Management Unit
FDOD	Flight Data Operations Division (CFMU)
FDP	Flight Data Processing
FDPS	Flight Data Processing Service
FDPS	Flight Data Processing System
FDR	Feeder
FDR	Flight Data Recorder
FDS	Flight Data Server
FDS	Flight Data Specialist
FDSU	Flight Data Storage Unit
FE	Field Evaluation
FEATS	Future European Air Traffic Management System (ICAO)
FEC	Forward Error Correction (VDL)
FEC	Forward Error Correction
FFAS	Free Flight Airspace
FF-ICE	Flight & Flow Information for a Collaborative Environment (ICAO)
FFM	Free Flight Mode
FFP1	Free Flight Phase 1 (FAA)
FFRDC	Federally Funded Research and Development Center (U.S.)
FFT	Free Flight Track (ASAS)
FG	Functional Group
FGS	Flight Guidance System
FHA	Functional Hazard Analysis
FHSS	Frequency Hopping Spread Spectrum
FIC	Flight Information Center
FID	Flight Identification (ICAO)
FIDS	Flight Information Display System
FIESTA	Flight Information Electronic Service for the Test of AFAS (ATM Ground Test Bed)
FIFO	First In First Out
FIL	FAST Information List
FIO	Flight Information Office
FIR	Flight Information Region
FIS	Flight Information Services
FIS-B	FIS-Broadcast
FISO	Flight Information Service Officer
FIXM	Flight Information Exchange Model
FL	Flight Level
FLAAS	Flexible Airborne ATN System
FLAG	Flexible ATN Ground System (NLR)
FLD	Field
FLG	Flashing
FLID	Flight ID
FLIPCY	Flight Plan Consistency (ODIAC)
FLIPCY-4D	Flight Plan Consistency Check 4D (AFAS D/L Service)
FLIPINT	Flight Plan Intent Downlink
FLIR	Forward Looking Infra-Red (Radar)
FLS	Flight Suspension (Message)
FLT	Flight
FLYCO	Flying Co-ordinator
FM	Fan Marker
FM	Flight Management
FM	Flow Management
FM	Follow-Me
FMAN	Flow Manager
FMAS	Flexible Military Airspace Structures
FMC	Flight Management Computer
FMCDU	Flight Management Control and Display Unit
FMCS	Flight Management Computer System
FMCU	Flight Management Computer Unit
FMCW	Frequency Modulated Continuous Wave (Radar)
FMD	Flow Management Division
FMEA	Failure Modes and Effect Analysis
FMES	Failure Mode Effect on System
FMGC	Flight Management Guidance Computer
FMGEC	Flight Management Guidance Envelope Computer
FMP	Flight Manager (Management) Position
FMP	Flow Management Position
FMS	Flight Management System
FNL	On Final Approach (flight status)
FOA	Full Operational Assessment
FOBT	First Off-Block Time (AFAS)
FOC	Flight Operations Centre
FOC	Full Operating Capability
FOD	Foreign Object Debris
FOM	Federation Object Model (HLA)
FoM	Figure of Merit
FOS	Flight Operations Services
FOU	Frequency of Use
FP	Flight Plan(ning)
FPL	Flight Plan
FPM	Feet Per Minute
FPM	Flight Position/Path Monitor
FPPS	Flight Plan Processing System
FPS	Flight Progress Strip
FR	Flight Route
FRA	Free Route Airspace
FRAPORT	Frankfurt Airport Services Worldwide
FRC	Flight Plan Route Conformance
FRD	Functional Requirements Document
FREER	Free Route Experimental Resolution Project
FREQ	Frequency
FRM	Final Review Meeting
FSA	First System Activation
FSD	Full Scale Development
FSL	FLAAS Service Layer Deployment
FSS	Flight Service Station
FSU	File Server Unit
FT	Feet
FTS	Fast-Time Simulations
FTS	Flexible Track System
FTTA	From Touchdown Till Airborne
FUA	Flexible Use of Airspace
FUM	Flight Update Message
FWC	Flight Warning Computer
G
G	Golf Time Zone (UTC + 7 hrs.)
G/G	Ground/Ground
G/S	Glide Slope
G/S	Ground Speed
G2G	Gate-To-Gate (EC Project)
GA	General Aviation
GACS	Generic ATN Communication Service (EUROCONTROL)
GADSS	Global Aeronautical Distress and Safety System (ICAO)
GALILEO	European Global Satellite Navigation System
GAM	Generic Airport Model (EUROCONTROL TAAM Model)
GAR	Gate Acceptance Rate
GAREX	Voice Communication Control System
GARS	German Aviation Research Society
GASEL	Generic ATFM Simulator Engine and Library (NATS)
GAST	Gate Allocation Scheduled Time
GAT	General Aviation Traffic
GATELINK	Gate-Aircraft Terminal Environmental Link
GATM	Global Air Traffic Management (military version of CNS-ATM concept)
GBAS	Ground Based Augmentation System
GC	Ground Controller
GCA	Ground Controlled Approach (Radar)
GCO	Ground Communications Outlet
GCP	Generic Control Panel
GDC	Graphically Dispalyed Clearances
GDLP	Ground DL Processor
GDP	Gross Domestic Product
GEC	Ground Executive Controller
GECO	Generic Cockpit Simulator (DLR)
GEO	Geographic
GES	Ground Earth Station
GFE	Government Furnished Equipment
GFI	Government Furnished Information
GFORCE	Generic Fighter Operations Research Cockpit Environment (NLR)
GFP	Government Furnished Property
GFSK	Gaussian Frequency Shift Keying (VDL Mode 4)
GFST	Gate Free Scheduled Time
GH	Ground Handler
GHMI	Ground HMI
GICB	Ground Initiated Comm-B
GIS	Geographic Information System
GLASS	Generic Library for Air Traffic Simulation Services
GLONASS	Global Orbiting Navigation Satellite System
GLS	Global Landing System
GLU	GPS Landing Unit
GM	Guidance Material
GMC	Ground Movement Control(ler)
GMS	Gate Management System (Successor of TRASS)
GMS	Ground Movement Surveillance
GMSK	Gaussian Minimum Shift Keying (GFSK)
GMT	Greenwich Mean Time (Zulu)
GND	Ground (Control)
GND	Surface of the Earth
GNI	Ground Network Interface (VDL)
GNLU	GNSS Navigation and Landing Unit
GNS	Global Navigation System
GNSS	Global Navigation Satellite System
GNSSP	Global Navigation Satellite System Panel (ICAO)
GNSSU	GNSS Unit
GO/NG	Go/No Go
GOA	Go-around (flight status)
GOS	Gate Operating System
GP	Glidepath
GP & C	Global Positioning & Communication
GPS	Global Positioning System
GPWS	Ground Proximity/Position Warning System
GRA	Green Regional Aircraft (CleanSky)
GRACE	Generic Research Aircraft Cockpit Environment (NLR)
GRAIL	Ground RT ATM Integration Lab
GRASP	GRAIL Airspace Toolkit
GRC	Green Rotorcraft
GRD	Ground
GS	Glide Slope
GS	Ground Station
GS	Ground Surveillance
GS	Groundspeed
GSC	Global Signalling Channels (VDL Mode 4)
GSIF	Ground Station Identification Frames (VDL)
GSM	Global System for Mobile Communications
GTD	Ground Traffic Display
GTG	Gate-to-Gate (EC 5th Framework Programme)
GTW	Gateway
GUFI	Global Unique Flight Identifier
GUI	Graphical User Interface
GVP	Good Visibility Procedures
GWS	Graphical Weather Service
GWT	Gross Weight
GWY	Gateway
H
H	High
H	Hotel Time Zone (UTC + 8 hrs.)
H	Hypothesis
H	Non-directional Radio Beacon
H24	24-Hour Service
HAA	Height Above Airport
HAI	Helicopter Association International
HALS	Human Assurance Levels
HAS	Height Above Site
HAT	Height Above Touchdown
HAZID	Hazard Identification
HC	Critical Height
HCC	Hub Control Centre
HCS	Hidden Camera Surveillance
HCS	Host Computer System
HDG	Heading
HEMS	Helicopter Emergency Medical Service
HERMES	Heuristic Runway Movement Event Simulation (NATS)
HEX	Hexadecimal
HF	High Frequency (3.000 to 30.000 KHz)
HF	Human Factors
HFDL	High Frequency Data Link
HFI	Human Factors Integration (EUROCONTROL)
HI	High Intensity (Lights)
HIALS	High Intensity Approach Light System
HID	Host Interface Device
HID-I	HID Interface CSCI
HID-S	HID Software CSCI
HIPERLAN	High Performance Radio Local Area Networks
HIPS	Highly Interactive Problem Solver (PHARE)
HIRL	High Intensity Runway Edge Lights
HIRO	High Intensity Runway Operation
HITL	Human-In-The-Loop
HITT	Holland Institute of Traffic Technology
HIWAS	Hazardous Inflight Weather Advisory Service
HJ	Sunrise to Sunset
HLA	High Level Architecture
HLAG	High Level Advisory Group (MAEVA)
HLAPB	High Level Airspace Policy Body
HLT	Heavy Load Threshold (Controller Workload Level)
HMI	Human Machine Interface
HN	Sunset to Sunrise
HO	By Operational Requirements
HO	High-Level Objective
HP	Human Performance
hPa	Hectopascal (1 hectopascal = 1 millibar)
HPL	Horizontal Protection Limit
HPSF	Human Performance Steering Function
HQ	Headquarters
HR	Hours
HRA	Human Reliability Assessment
HRM	Human Resource Management (EUROCONTROL)
HSD	High Speed Data
HSI	Horizontal Situation Indicator
HST	High Speed Taxi-way Turn-off
HTML	Hypertext Markup Language
HTTP	Hypertext Transport Protocol
HUD	Head-Up Display
HW	Hardware
HWCI	Hardware Configuration Item
Hz	Hertz (Cycles per Second)
I
I	India Time Zone (UTC + 9 hrs.)
I/CO	Installation and Check Out
I/F	Interface
I/O	Input/Output
I/V	Instrument/Visual Controlled Airspace
IA	Interoperability Assessment
IAF	Initial Approach Fix
IAFSS	International Automated Flight Service Stations
IANS	Institute of Air Navigation Services (EUROCONTROL)
IAOPA	International Council of Aircraft Owner and Pilot Associations
IAS	Indicated Air Speed
IATA	International Air Transport Association
IB	Information Button (Right Mouse Button, EUROCONTROL)
IBK	In Block (flight status)
IBN	Identification Beacon
IBP	Inbound Planner
IBP	Industry Based Platform (SESAR-JU)
IC	Inbound Controller
ICAO	International Civil Aviation Organization
ICAS	International Co-operation on Airport Surveillance
ICB	Industry Consultation Board
ICC	Inter-Centre Communications
ICD	Interface Control Document
ICP	Initial Climb Procedure (SID)
ICP	Installed Communication Performance
ICT	Information and Communication Technology
ID	Identification
IDAT	Intersect Density Analysis Toolset (MITRE)
IDD	Interface Design Document
IDENT	(Squawk) Identification
IDH	Indefinite Holding (flight status)
IDL	Interactive Data Language
IDL	Interface Definition Language
IDR	Incremental Design Review
IDRP	Inter-Domain Routing Protocol
IEC	International Electrotechnical Commission
IEEE	Institute of Electrical and Electronics Engineers
IenW	Ministerie van Infrastructuur en Waterstaat
IER	Information Exchange Requirements
IETF	Internet Engineering Task Force
IETON	Interface EOLIA to NARSIM
IF	Intermediate Fix
IFA	International Federation of Airworthiness
IFALPA	International Federation of Air Line Pilots Associations
IFATCA	International Federation of ATCo Associations
IFDS	Initial Flight Data System
IFL	Intermediate Flight Level
IFORS	International Federation of Operational Research Societies
IFP	Initial Flight Plan
IFPL	Initial Flight Plan
IFPLID	Initial Flight Plan Identifier
IFPS	Initial Flight Plan Processing System
IFPU	Initial Flight Plan Processing Unit
IFPUV	Initial Flight Plan Processing Unit Validation System
IFR	Instrument Flight Rules
IFU	Interface Unit
IGS	Instrument Guidance System
IGS	Intelligent Ground System
IIMSES	Initial Implementation of Mode S Enhanced Surveillance
IIS	Integrated Information System
IKC	In-kind Contribution
ILenT	Inspectie Leefomgeving en Transport
ILS	Instrument Landing System
ILS	Integrated Logistics Support
ILSP	Integrated Logistics Support Plan
IM	Inner Marker
IMC	Instrument Meteorological Conditions
IMC	Instrument Meteorological Conditions
IMM	Integrated Moving Map
IMS	Integrated Management System
IMTA	Intensive Military Training Area
IN	Inch
INAP	Integrated Network Management and Extended ATC Planning
InCAS	Interactive Collision Avoidance Simulator (EUROCONTROL)
INDEFLY	Indefinitely
INECO	Ingenieria y Economia del Transporte
INFO	Information
INM	Integrated Noise Model (FAA)
INMARSAT	International Maritime Satellite Organization
INOP	Inoperative
INS	Inertial Navigation System
INS	Innovative Studies (EUROCONTROL)
INSU	Integrated Network Server Unit
INT	Intersection
INTEGRA	Integrated Process for Validation
INTENT	Global A/G Collaboration in Traffic Separation Assurance
INTEROP	Interoperability
INTL	International
IOBT	Initial Off-Block Time
IOC	I/O Calls
IOC	Initial Operating Capability
IOP	Initial Operational Plan
IOP	Input Output Processor
IOP	Interoperability
IOR	Interoperability Requirement
IORRA	Indian Ocean Random RNAV Area Instrument Restricted Controlled Airspace
IP	Implementation Package
IP	Internet(work) Protocol
IPAS	Tools for Preparation and Analysis of ATM simulations (ESCAPE)
IPC	Inter-process Communication
IPR	Intellectual Property Rights
IPT	Integrated Product Team
IR	Implementation (Implementing) Rule
IR	Infra Red
IR	Instrument Restricted Controlled Airspace
IRBT	Initial Reference Business Trajectory
IRD	Interface Requirements Document
IRMT	Initial Reference Mission Trajectory
IRS	Inertial Reference System
IRS	Interface Requirement Specification
IS	Intermediate System
ISA	Instantaneous Self Assessment (Workload Assessment Method)
ISAAS	Implementation Schiphol Advanced Airport System
ISAWARE	Increasing Safety by Enhancing Crew Situation Awareness
ISBT	Initial Shared Business Trajectory
ISDN	Integrated Services Digital Network
ISL	Intermediate Supplementary Flight Level
ISM	Industrial, Scientific and Manufacturing (Frequency Spectrum)
ISMS	IT Security Management System
ISMT	Initial Shared Mission Trajectory
ISO	International Standardization Organization
ISP	Information Security Policies
ISP	Integrated Support Plan
ISRM	Information Service Reference Model
ISS	Increased Schiphol Sustainability (KDC)
ISS	Information Systems Support (EUROCONTROL)
ISSS	Initial Sector Suite System
IT	Information Technology
ITC	Integrated Timing Concept
ITC	In-trail Climb
ITD	Integrated Technology Demonstrators
ITD	In-trail Descent
ITF	In-trail Follow (ASAS)
ITIL	Information Technology Infrastructure Library
ITM	In-trail Merge (ASAS)
ITP	In-Trail Procedure (ASAS)
ITU	International Telecommunications Union
ITWP	Integrated Tower Working Position (EUROCONTROL)
ITWS	Integrated Target/Terminal Weather System
IVSI	Instantaneous Vertical Speed Indicator
J
JAA	Joint Aviation Authorities
JANE	Joint Air Navigation Experiments (DFS)
JAR	Joint Airworthiness Regulations
JAR	Joint Aviation Requirements
JAR	Joint Airworthiness Requirement
JAVA	Internet Application Technology Language
JCAB	Japan Civil Aviation Bureau
JDBC	JAVA Database Connectivity
JPB	Joint Programme Board
JPDO	Joint Planning and Development Office (U.S.)
JPG	Joint Photographic Experts Group
JRCC	Joint Rescue Co-ordination Centre
JSSI	Joint Safety Strategy Initiative
JTI	Joint Technology Initiative (European Commission)
K
K	Kilo Time Zone (UTC + 10 hrs.)
KBRA	Knowledge-Based Runway Allocation
KBS	Knowledge-Based Sequencing
KDC	Knowledge and Development Centre (Schiphol)
KDP	Key Decision Point
KEMA	Keuring van Elektrotechnische Materialen te Arnhem
KFB	Kommunikations Forsknings Beredningen
KG	Kilograms
kHz	Kilohertz
kIAS	knots Indicated Air Speed
KISS	Keep it simple stupid
KLM	Koninklijke Nederlandse Luchtvaart Maatschappij (Royal Dutch Airlines)
KLS	KLM Luchtvaart School (KLM Flight Academy)
KM	Kilometer
KMH	Kilometers per Hour
KNMI	Koninklijk Nederlands Meteorologisch Instituut (Royal Dutch Meteorological Institute)
KOM	Kick-Off Meeting
KPA	Key Performance Area
KPI	Key Performance Indicator
KT	Knots
KTAS	Knots True Airspeed
KVM	Keyboard/Video/Mouse (Switch)
L
L	Lima Time Zone (UTC + 11 hrs.)
L	Locator (Compass)
L	Low
LAA	Local Airport Advisory
LAAS	Local Area Augmentation System
LACFT	Large Aircraft
LACK	Logical Acknowledgement
LADGNSS	Local Area Differential Global Navigation Sattelite System
LADGPS	Local Area Differential GPS
LAHSO	Land and Hold Short Operations
LAN	Local Area Network
LAP	Link Access Protocol
LAR	Lange Afstand Radar (Dutch for Long Range Radar)
LARA	Local and Sub-Regional Airspace Management Support System (EUROCONTROL/Graffica)
LAT	Latitude
LBA	Luftfahrt-Bundesamt (German Aviation Authorities)
LBCM	Locator Back Course Marker
LBM	Locator Back Marker
LBS	Pounds (Weight)
LCD	Liquid Crystal Display
LCDP	Landing Clearance Delivery Point
LCG	Load Classification Group
LCIP	Local Convergence and Implementation Plan
LCM	Local Capacity Manager
LCN	Load Classification Number
LCTR	Locator (Compass)
LDA	Landing Distance Available
LDA	Localizer Directional Aid
LDH	Long Range Radar Den Helder
LDI	Landing Direction Indicator
LDIN	Lead-in Light System
LDPU	Link and Display Processor Unit
LED	Light Emitting Diode
LEO	Low Earth Orbit
LEONARDO	Linking Existing On Ground, Arrival and Departure Operations (EC Project)
LFT	Lufthansa Flight Training
LFV	Luftfartsverket (Swedish Civil Aviation Administration)
LGTH	Length
LHIS	Airport Information System
LHW	Long Range Radar Herwijnen
LIB	Luchthavenindelingbesluit Schiphol (Airport Structure Enactment Schiphol)
LIDAR	Light Detection and Ranging
LIM	Locator Inner Marker
Link2000+	Implementation of Operational A/G Datalink Services in Europe (EUROCONTROL)
LIV	Landing Interval
LL	Lower Layers
LLC	Logical Link Control
LLWAS	Low Level Wind Shear Alert System
LMD	Luchtvaartmeteorologische Dienst (Dutch Aviation Meteorological Service)
LME	Link Management Entity (VDL)
LMM	Locator Middle Marker
LNDG	Landing
LO	Low-Level Objective
LOA	Landing Order Calculator
LOA	Letter of Agreement
LOA	Limited Operational Assessment
LOC	Landing Order Calculator
LOC	Localizer
LOM	Locator Outer Marker
LONG	Longitude
LORAN	Long Range Navigation
LPV	Localizer Procedure with Vertical Guidance
LREF	Local Reference
LRI	Line Replaceable Item
LRM	Line Replaceable Module
LRU	Line Replaceable Unit
LRU	Lowest Replaceable Unit
LSA	Localiser Sensitivity Area
LSA	Logistics Support Analysis
LSALT	Lowest Safe Altitude
LT	Local Time
LTI	Long-Term Investigation (EUROCONTROL)
LTM	Local Traffic Manager
LTS	Lights
LVB	Luchthavenverkeerbesluit Schiphol (Airport Traffic Enactment Schiphol)
LVB	Luchtverkeersbeveiliging Nederland (former Dutch ATC)
LVNL	Luchtverkeersleiding Nederland (Dutch ATC)
LVO	Low Visibility Operations
LVP	Low Visibility Procedure
M
M	Medium
M	Meters
M	Mike Time Zone (UTC + 12 hrs.)
M&S	Modeling and Simulation
MA	Message Assurance (PETAL)
MAA	Maximum Authorized Altitude
MA-AFAS	More Autonomous AFAS (EC 5th Framework Programme)
MAC	Media Access Control (VDL)
MACAD	MANTEA Airfield Capacity and Delay (AUEB)
MACH	MACH number (Speed Ratio to Speed of Sound)
MADAP	Maastricht Automatic Data Processing System
MAESTRO	Means to Aid Expedition and Sequencing of Traffic with Research of Optimisation
MAEVA	Master ATM European Validation Plan (EC 5th Framework Programme)
MAG	Magnetic
MALS	Medium Intensity Approach Light System
MALSF	Medium Intensity Approach Light System with Sequenced Flashing Lights
MALSR	Medium Intensity Approach Light System with Runway Alignment Indicator Lights
MAM	Military Ackmowledgement Message
MAM	Military Airspace Manager
MANTEA	Management of Surface Traffic in European Airports
MAP	Missed Approach Point
MapInfo	MITRE CAASD Map Information Tool (MITRE)
MAPS	Meteorological & Aeronautical Presentation System
MAR	Major Acquisition Review
MAS	Managed Airspace
MAS	Measurement and Analysis Specification (MAEVA)
MA-SCA	Malpensa Enhanced Surface Conflict Alerting Tool (ENAV)
MASDIV	Massive Diversion
MASI	Mach Airspeed Indicator
MASPS	Minimum Aviation System Performance Standards
MASS	Multi Aircraft Simplified Simulator (DSNA)
MATCC	Military Air Traffic Control Centre (Netherlands)
MAVERIX	Metrics and Validation Elements for the INTEGRA Execution Phase
MAX	Maximum
MB	Management Board
MB	Millibars
MBM	Management Board Meeting
MBZ	Mandatory Broadcast Zone
MC	Multi Center
MCA	Minimum Crossing Altitude
MCAF	Marine Corps Air Facility
MCAS	Marine Corps Air Station
MCDU	Multifunctional CDU
MCP	Mode Control Panel
MCS	Multi-Cockpit Simulator (EUROCONTROL)
MCTA	Military Controlled Airspace
MD	Managing Director
MDA	Minimum Decision Altitude
MDA	Minimum Descent Altitude
MDAU	Maintenance Data Acquisition Unit
MDH	Minimum Descent Height
MDT	Mountain Daylight Time
MEA	Minimum Enroute Altitude
MEHT	Minimum Eye Height Over Threshold
MEL	Minimum Equipment List
MEML	Memorial
MEO	Medium Earth Orbit
MET	Meteorology/Meteorological
MET	Metering Fix
METAR	Meteorological Aerodrome Report
METEO	Meteorological
MF	Medium/Mandatory Frequency (300-3000 kHz)
MF	Meter Fix
MFAR	Meter Fix Acceptance Rate
MFD	Multi-function Display
MFEP	Mode-S Front-end Processor
MFF	Mediterranean Free Flight
MFL	Maximum Flight Level
MFT	Meter Fix Crossing Time (ASP)
MFT	Meter Fix Time
MHA	Minimum Holding Altitude
MHS	Message Handling System
MHz	Megahertz
MI	Medium Intensity (Lights)
MIALS	Medium Intensity Approach Light System
MIC	Microphone
MIDAS	Man-Machine Integration Design and Analysis System (NASA)
MIDI	Minimum Departure Interval (Flow Control Measure)
MIL	Military
MILO	Military Liaison Officer
MIN	Minimum
MIN	Minute
MIRL	Medium Intensity Runway Edge Lights
MIT	Massachusetts Institute of Technology (Boston, U.S.)
MIT	Miles-in-trail
MIT/LL	Massachusetts Institute of Technology - Lincoln Laboratory
MITRE	MITRE Corporation
MIW	Message-In Window (EUROCONTROL TED)
MKR	Marker Radio Beacon
MLAT	Multilateration
MLDT	Mean Logistics Delay Time
MLR	Main Landing Runway
MLS	Microwave Landing System
MLT	Multilateration System
MLW	Maximum Landing Weight
MM	Man Months
MM	Middle Marker
MM5	PSU/NCAR Mesoscale Model (Penn State)
MMC	Maintenance Monitor Console
MMC	Martin Marietta Corporation
MMD	Moving Map Display
MMEL	Master Minimum Equipment List
MMI	Man-Machine Interface
MMR	Multi-Mode Receiver
MNPS	Minimum Navigation Performance Specifications
MOA	Military Operation Area
MOBT	Managed Off-Block Time
MOCA	Minimum Obstruction Clearance Altitude
MOD	Matrix of Detection (Surveillance)
MoF	Mode of Flight
MOI	Matrix of Identification (Surveillance)
MONA	Monitoring Aid
MONITOR	Datalink Monitoring Message
MOPS	Minimum Operational Performance Specifications
MORA	Minimum Off-Route Altitude
MORIASS	Mock-Up Runway Incursion Alerting System Schiphol
MOS	Monitor Operating System
MOSQUITO	Mode-S Squitter Vehicle Tracking Unit (THALES)
MOTS	Modified Off-The-Shelf
MOU	Memorandum of Understanding
MOW	Message-Out Window (EUROCONTROL TED)
MOZART	Maestro Optimisé pour les Zones d' Approche et de Régulation du Trafic
MPT	Japanese Ministry of Posts and Telecommunications
MRA	Minimum Reception Altitude
MRD	Maintenance Requirements Document
MRI	Main Runway Indicator System
MRT	Monitoring R/T (ACM Service Message)
MRVA	Minimum Radar Vectoring Altitudes
MS	Microsoft
MSA	Minimum Safe Altitude
MSAS	MTSAT Satellite-Based Augmentation System (JCAB)
MSAW	Minimum Safe Altitude Warning
MSF	Master Simulation Facility
MSG	Message
MSL	Maximum Stress Load
MSL	Mean Sea Level
MSO	Message Start Opportunities
MSPSR	Multi-static Primary Surveillance Radar
MSSC	Minimum Set of Security Controls
MSSR	Monopulse Secondary Surveillance Radar
MSSS	Mode-S Specific Services
MST	Milestone
MST	Mountain Standard Time
MST	Multi-Sensor Tracker
MT	Management Team
MTA	Military Training Area
MTAF	Mandatory Traffic Advisory Frequency
MTBF	Mean-Time-Between-Failure
MTCA	Minimum Terrain Clearance Altitude
MTCD	Medium Term Conflict Detection
MTMA	Military Terminal Control Area
MTOW	Maximum Take-off Weight
MTP	Main Take-off Preference
MTSAT	Multi-functional Transport Satellite
MTTR	Mean-Time-to-Repair
MTTR	Mean-Time-to-Restore
MTTT	Minimum Turn-around Time
MTV	Mid-Term Validation (EUROCONTROL)
MU	ACARS Management Unit
MUAC	Maastricht UAC
MUN	Municipal
MVA	Minimum Vectoring Altitude
MVP	Machine Vision Processor
MVP	Marginal Visibility Procedures
MVPA	Military Variable Profile Area
MVT	Movement (Message) (ACARS/AOC/CDM)
MWM	Multi-Workload Model (AENA)
MWO	Meteorological Watch Office (U.S.)
N
N	Night
N	North
N	November Time Zone (UTC - 1 hrs.)
N/A	Not Applicable
NA	Not Authorized
NAAN	North Atlantic ADS-B Network
NAAS	Naval Auxiliary Air Station
NAC	Navigation Accuracy Category
NACO	Netherlands Airport Consultants
NADC	Naval Air Development Center
NADT	NLR A-SMGCS Departure Tool
NAEC	Naval Air Engineering Center
NAF	NATO Architecture Framework
NAF	Naval Air Facility
NAILS	National Airspace Integrated Logistics Support
NAILSMT	NAILS Management Team
NALF	Naval Auxiliary Landing Field
NAM	North American (Region)
NAP	Noise Abatement Procedure
NAPPA	NLR ATN Protocol and Performance Analyser
NAPRS	National Airspace Performance Reporting System
NAR	North American Routes
NARIM	The National Airspace Resource Investment Model (FAA)
NARSIM	NLR ATC Research Simulator
NAS	National Airspace System (U.S.)
NAS	Naval Air Station
NASA	National Aeronautics and Space Administration (U.S.)
NASPAC	National Airspace Performance Analysis Capability (FAA/MITRE)
NASSI	NAS Status Information
NAT	North Atlantic (Region)
NAT	North Atlantic Tracks/Traffic
NATCA	National Air Traffic Controller Association (U.S.)
NATL	National
NATO	North Atlantic Treaty Organization
NATS	National Air Traffic Services (U.K.)
NAV	Navigation
NAV	Network Allocation Vector
NAVAID	Navigation Aid
NCA	Northern Control Area
NCAT	National Center for Advanced Technologies (U.S.)
NCP	NAS Change Proposal
NCRP	Non-Compulsory Reporting Point
NCS	NARSIM Client/Server Communication System (NLR)
ND	Navigation Display
NDA	Next Data Authority
NDB	Navigation Data Base
NDB	Non-Directional Beacon
NDI	Non-developmental Items
NDIF	NLR Departure Manager Interface
NDLS	NLR Datalink Server
NDOP	Network Director Operations
NEAN	North European ADS-B Network
NEANS	NEAN Server
NEAP	North European CNS/ATM Applications Project
NET	Network (EUROCONTROL)
NEU	North East Upper (Sector)
NEVAC	Network Evaluation and Visualisation of ACC Capacity (EUROCONTROL)
NFD	Network Flow Diagrams
NFDC	National Flight Data Center
NFEP	NEAN Front-end Processor
NFFP	Nationella Flyg Forsknings Programmet (Sweden)
NFL	Entry Flight Level
NFR	Non-functional Requirement
NFZ	No-Fly Zone
NGATS	Next Generation Air Transportation System (U.S.)
NIA	National Institute of Aerospace (Graduate Education)
NIMS	Network Information Management System
NIRS	Noise Integrated Routing System (MITRE)
NIU-I	Network Interface Unit Interface CSCI
NIU-S	Network Interface Unit Software CSCI
NLA	New Large Aircraft
NLR	Nationaal Lucht- en Ruimtevaartlaboratorium (National Aerospace Laboratory of the Netherlands)
NM	Nautical Miles
NM	Negotiation Manager
NM	Network Management Function
NM	Network Manager
NMAC	Near Mid Air Collision
NMB	Network Management Board
NMC	Network Management Cell
NMEA	National Marine Electronics Association
NMI	Nautical Miles
NMOC	Network Manager Operation Centre
NMS	Navigation Management System
NN	Non-nominal
NOAA	National Oceanic and Atmospheric Administration (U.S.)
NOC	No Connection
NOMAS	NOTAM Management System
NOMOS	Noise Monitoring System
NOP	Network Operational Plan
NOPLA	Network Operation Planner
NoPT	No Procedure Turn
NOS	Network Operating System
NOTAM	Notice to Airmen (Emergency Note)
NPA	Non-Precision Approach
NPDU	Network Protocol Data Unit
NPM	Node and Process Management
NRFS	NLR Research Flight Simulator (NLR)
NS	Next Sector Field (EUROCONTROL)
NSA	National Safety Authority
NSA	National Supervisory Authority
NSAP	Network Service Access Point
NSOR	New Systems Operations Room (NATS)
NSP	Network Strategic Plan
NSS	Navaid Status Signalling System
NSTB	National Satellite Test Bed
NTIA	National Telecommunications and Information Administration
NTIS	National Technical Information Service (Department of Commerce)
NTP	Network Time Protocol
NTSB	National Transportation Safety Board
NTZ	No Transgression Zone
NUC	Navigation Uncertainty Category (Position UC and Velocity UC)
NUP	NEAN Update Programme
NWC	Naval Weapons Center
NWS	National Weather Service (U.S.)
NZ	Normal Zone
O
O	Oscar Time Zone (UTC - 2 hrs.)
O/R	On Request
O/T	Other Times
OAC	Oceanic Area Control
OAT	Operational Air Traffic
OATA	Overall ATM/CNS Target Architecture
OBS	Organisational Breakdown Structure
OC	Operation Centre
OC	Operational Concept
OCA	Obstacle Clearance Altitude
OCA	Occupied Active Points
OCA	Oceanic Control Area
OCC	Operations Control Centre (KLM)
OCD	Oceanic Clearance Delivery
OCD	Operational Concept Document
OCH	Obstacle Clearance Height
OCL	Obstruction Clearance Limit
OCNL	Occasional
OCP	Operational Change Proposal
OCR	Operational Change Request
OCTA	Oceanic Control Area
OCV	Operational Concept Validation
OCVS	Operational Concept Validation Strategy
OCVSD	Operational Concept Validation Strategy Document (EUROCONTROL/FAA)
ODALS	Omni-Directional Approach Light System
ODAPS	Oceanic Display and Planning System
ODIAC	Operational Development of Initial A/G Data Communications
ODID	Operational Display and Input Development
ODIR	Opposite Direction Conflict
ODP	Object-oriented DP
ODS	Operational Input and Display System
ODS	Operator Display System
ODT	Operational Requirements and Data Processing Systems Team (EUROCONTROL)
OE	Operating Environment (CSCI)
OED	Operational Environment Description
OEP	Operational Evolution Plan (FAA)
OETA	Original Estimated Time of Arrival
OF	Operational Feasibility
OFA	Operational Focus Area
OFIS	Operational Flight Information Service
OFT	Outer Fix Time
OFX	Outer Fix
OFZ	Obstacle Free Zone
OHA	Operational Hazard Assessment
OI	Operational Improvement
OICS	Operational Implementation Conformance Statements
OIM	Operations and Instructions Manual (LVNL Description of ATC Systems and their Use)
OJT	On-the-Job Training
OJTI	On-the-Job Training Instructor
OLDI	Online Data Interchange
OM	Outer Marker
OMDD	Object Model Data Dictionary (DMSO)
OMG	Object Management Group (EUROCONTROL)
OML	Object Model Library (DMSO)
OMT	Object Model Template
OMT	Object Modeling Technique
OneSky	One Non-National European Sky (EUROCONTROL)
OO	Object-Oriented
OOAD	Object-Oriented Analysis and Design
OPA	Operational Performance Assessment
OPAL	Optimization Platform for Airports including Landside
OPAS	Outil de Planification ATM et de Simulation (DSNA)
OPDAT	Operational Data
OPGEN	Optimal Trajectory Generator (CSSI)
OPR	ATM Operational Requirements
OPS	Operations
OPTIMAL	Optimized Procedures and Techniques for Improvement of Approach and Landing
OR	Operational Requirement
ORB	Object Request Broker
ORCAM	Originating Region Code Assignment Method
ORD	Operational Readiness Demonstration
ORD	Operational Requirements Document
ORG	Organisation
ORQ	D-OTIS Request Message
ORT	Optimizing Runway Througput
OSA	Operational Safety Assessment
OSD	Operational System Development
OSED	Operational Services and Environment Definition
OSEIC	Operational Service Environment Information Capture process
OSI	Open Systems Interconnection
OSTP	Office of Science and Technology Policy (U.S.)
OSYRIS	Ortogon System for Real-time Inbound Sequencing
OT & E	Operational Test & Evaluation
OT & E/I	OT & E/Integration
OT & E/O	OT & E/Operational
OT & E/S	OT & E/Shakedown
OTD	D-OTIS Delivery Message
OTIS	Operational Terminal Information Service (ODIAC)
OTMV	Occupancy Traffic Monitor Values
OTR	Oceanic Transition Route
OTS	Off-The-Shelf
OTS	Out-of-Service
OTT	D-OTIS Termination Message
OTW	Out-The-Window (View)
P
P	Papa Time Zone (UTC - 3 hrs.)
P	Prohibited Area
P&S	Processes and Services
P2FEP	PETAL II Front-end Processor
P2L	PETAL to LINK (EUROCONTROL Implementation Project)
PA	Precision Accuracy
PA	Precision Approach
PAC	Pre-defined Alternate (Deferred) Clearance
PACS	Pan-European Airport Capacity Studies
PADS	Planned Arrival & Departure System
PAGODA	Prototype Cockpit (EUROCONTROL)
PAM	Aircrew Acknowledgement Message
PAMELA	Parametric ATM Model for European Policy Long-term Effects Assessment (EUROCONTROL)
PAMRI	Peripheral Adapter Module Replacement Item
PAN	Personal Area Network
PANEM	Parametric Noise and Emission Model (Airbus)
PANS	Procedures for Air Navigation Services (ICAO)
PAPI	Precision Approach Path Indicator
PAR	Precision Approach Radar
PAR	Preferred Arrival Route
PARR	Problem Analysis Resolution and Ranking
PAS	Pseudo Aircraft Simulation
PAT	Prototype Adaptation Toolkit
PAT & E	Production Acceptance Test & Evaluation
PATAM	PHARE Advanced Tool Arrival Manager (PHARE)
PATCAS	Predictive Approach Control Tactical Advisory System
PATIN	Net-centric Protection of Air Transportation Infrastructure (FP6 Project)
PATIO	European Project for Development of RFS
PATN	PHARE Aeronautical Telecommunications Network
PATs	PHARE Advanced Tools
PAX	Passengers
PAZ	Protected Airspace Zone
PC	Personal Computer
PC	Planning Controller
PCA	Physical Configuration Audit
PCC	Programme Co-ordination Committee
PCC	Project Co-ordination Committee (MAEVA)
PCCA	Portable Computer and Communications Association
PCD	Project Contact Directory (MAEVA)
PCL	Pilot Controlled Lighting
PCN	Pavement Classification Number
PCO	Programme Co-ordinator
PCO	Project Co-ordinator
PCOD	Planning Conflict Detection
PCP	Pilot Common Projects (SESAR)
PCT	Probability of Continuous Track (Surveillance)
PCZ	Positive Control Zone
PD	Probability of Detection (Surveillance)
PD/3	PHARE Demonstration 3
PDAS	Probability of Detection of an Alert Situation (Surveillance)
PDC	Pre-Departure Clearance
PDC	Private Data Channel
PDCA	Plan Do Check Act (Management Methodology)
PDCL	Pre-Departure Clearance
PDD	Program Design Document
PDF	Portable Document Format
PDI	Performance Driver Indicator
PDM	People Development Management (EUROCONTROL)
PDME	Precision DME
PDP	Project Documentation Plan (MAEVA)
PDR	Preliminary Design Review
PDS	Planner Departure Sequence
PDT	Pacific Daylight Time
PDT	Portable Display Terminal
PDU	Protocol Data Unit
PE	PAMRI Emulator HWCI
PEGASE	Platform of Experimentations on Ground and Air Simulated Environments (DSNA)
PE-I	PAMRI Emulator Interface CSCI
PEL	Planned (Sector) Entry Level
PEM	Performance Engineering Manual
PER	Packed Encoding Rules (CPDLC)
PERF	Performance
PERM	Permanent
PE-S	PAMRI Emulator Software CSCI
PETAL	Preliminary EUROCONTROL Test of Air/Ground Datalink
PF	Pilot Flying
PFA	Probability of False Alert (Surveillance)
pFAST	Passive Final Approach Spacing Tool
PFD	Primary Flight Display
PFD	Probability of False Detection (Surveillance)
PFH	Position First Heard
PFID	Probability of False Identification (Surveillance)
PFS	Profile Selector CSCI
PGUI	Planview Graphical User Interface
PHA	Preliminary Hazard Analysis
PHARE	Programme for Harmonised ATM Research in EUROCONTROL
PHS & T	Packaging, Handling, Storage and Transportation
PIB	Pre-flight Information Bulletin
PICASSO	Statistical Application for Control, Analysis and Monitoring of the Spanish Air Navigation System (AENA)
PICS	Protocol Implementation Conformance Statements
PID	Probability of Identification (Surveillance)
PIP	Program Implementation Plan
PIRG	Planning and Implementation Regional Group
PISTON	Piston Aircraft
PIT	PETAL Integration Team
PITOT	Process-based Integrated Platform for Optimal Use of Analysis Techniques (AENA)
PK	Parallel Runways Polder and Kaag (Amsterdam Airport Schiphol)
PLAID	Programming Language Independent Data Tool
PLASI	Pulsating Visual Approach Slope Indicator
PLC	Planning Controller
PLH	Position Last Heard
PM	Person Months
PM	Program Manager
PM	Progress Meeting
PMB	Project Management Board
PMM	Project Management Manual (MAEVA)
PMN	Project Manager (MAEVA)
PMP	Parts, Material and Process
PMP	Project Management Plan
PMT	Programme Management Team
PNF	Pilot Not Flying
PO	Principle of Operations
POB	Persons on Board
POBT	Proposed Off-Block Time
PPD	Pilot Preferences Downlink
PPD	Potential Problem Display (EATCHIP)
PPI	Pseudo-Pilot Interface
PPO	Prior Permission Only
PPR	Prior Permission Required
PPT	Pilot-proposed Trajectory (AFAS)
PQP	Project Quality Plan (MAEVA)
PR	Problem Report
PR	Procurement Request
PRA	Particular Risk Assessment
PRA	Precision Radar Approach
PRC	Performance Review Commission (EUROCONTROL)
PREDACOM	Platform for Research on End to End ATN Data Communications
PREDICT	Pre-tactical (Flow Management) System
PRM	Precision Radar/Runway Monitoring
P-RNAV	Precision Area Navigation
ProATN	Prototype ATN
PROP	Propeller Aircraft
PSM	Passive Shadow Mode (Test)
PSO	Program Support Office (EUROCONTROL)
PSP	Physical Security Plan
PSR	Primary Surveillance Radar
PSR	Program Status Review
PSSA	Preliminary System Safety Analysis
PST	Pacific Standard Time
PT	Predicted Trajectory
PTC	Precision Trajectory Clearances
PTC	Pre-Flight Trajectory Co-ordination (AFAS)
P-TFM	Probabilistic Traffic Flow Management
PTR	Problem Trouble Report
PTR	Profile Tuning Restriction
PTR	Program Technical Report
PTS	Purchase Technical Specification
PTZ	Pan-Tilt-Zoom (Camera)
PUMA	Performance and Usability Modelling in ATM (NATS)
PVD	Plan View Display
PVDM	Plan View Display Monitor
PVM	Parallel Virtual Machine
PVMD	Parallel Virtual Machine Daemon
PVT	Position Velocity Time
PVT	Private Operator
PWP	Pilot Working Position
PWP	Project Work Plan
Q
Q	Quebec Time Zone (UTC - 4 hrs.)
QA	Quality Assurance
QA	Quick Access
QCPP	Quality Control Program Plan
QDM	Magnetic Bearing to Facility
QDR	Magnetic Bearing from Facility
QFE	Altimeter setting (Height above Airport Elevation)
QNE	Altimeter setting (1013.2 mbar)
QNF	Altimeter setting (Height above Terrain)
QNH	Pressure Normal Height (Altimeter Setting - Altitude above Mean Sea Level)
QOS	Quality of Service
QRH	Quick Reference Handbook
QSY	Change Operating Frequency
R
R	Radar Controller (Executive or Tactical Controller)
R	Restricted Area
R	Revised
R	Risk
R	Romeo Time Zone (UTC - 5 hrs,)
R&B	Range and Bearing
R&D	Research and Development
R/T	Radio Telephony
RA	Requirements Analysis
RA	Radio Altimeter
RA	Radio Altitude
RA	Resolution Advisory (TCAS)
RA	Route Analysis CSCI
RAC	Rules of the Air and Air Traffic Control (ICAO)
RACE	Runway Capacity Enhancement
RAD	Aerodrome Radar Control Endorsement
RAD	Route Availability Document
RADE	Resolution Advisory Downlink Experiments
RADE-1	RA Downlink Experiments (Non-interactive)
RADE-2A	RA Downlink Experiments for Area Control
RADE-2P	RA Downlink Prototype Experiments
RADE-2T	RA Downlink Experiments for Terminal Control
RADNET	Radar Data Network
RAI	Runway Alignment Indicator
RAID	Redundant Array of Inexpensive Disks
RAIL	Runway Alignment Indicator Lights
RAM	Route Adherence Monitoring
RAMS	Regional Airspace Management System
RAMS	Re-organised ATC Mathematical Simulator (EURCONTROL/ISA)
RANC	Radar Absorption Noise and Clutter (SMR Extractor)
RAPCON	Radar Approach Control
RAPTOR	Remote Tower Operation with Augmented Vision
RAR	Runway Acceptance Rate
R-ATSU	Receiving ATSU
RB	Requirements Baseline
RBMM	Rule-based Moving Map
RBT	Reference Business Trajectory (SESAR)
RC	Requirements Capture
RC	Runway Controller
RCA	Remote Client Application (Flow Management Position)
RCAG	Remote Communications Air Ground
RCAS	Requested Calibrated Air Speed
RCC	Rescue Co-ordination Center
RCC	RUHR Sector Co-ordinator
RCCE	Runway Configuration Capacity Envelope
RCCM	Runway Configuration Change Management
RCD	DCL Request Message
RCL	Requested Cruise Level
RCL	Requested Cruising Level
RCL	Runway Center Line
RCLM	Runway Center Line Markings
RCM	Runway Configuration Management
RCMS	Remote Control and Monitoring System
RCO	Remote Communications Outlet
RCP	Required Communication Performance
RCR	Research and Development Centre for Radio Communications
R-CTOT	Refined Calculated Take-Off Time
RCTP	Required Communication Technical Performance
RD	Routing Domain
RDH	Height of ILS Reference Datum
RDI	Ready for De-icing (fligth status)
RDP	Radar Data Processing
RDPS	Radar Data Processing System
RDR	Radar
RDS	Radar Display System
RDY	Ready (Datalink Status)
REA	Ready Message
REA	Ready to Depart Message
REC	Request EOBT Change
REF	Reference
REG	Aircraft Registration
REIL	Runway End Identifier Lights
REJ	Rejection Message
REM	Runway Exit Manager
RENAR	Reseau de la Navigation Aerienne
R-EOBT	Refined Estimated Off-Block Time
REP	Ramp Entrance Point
REP	Reporting Point
REQ	Requirement
RER	Residual Error Rate
RES	Radio Equipment and Systems
RESA	Runway End Safety Area
RESP	Response Message Attribute (CPDLC)
RET	Rapid Exit Taxiway
RET	Returning (flight status)
RET	Revised EOBT
RETD	Revised Estimated Time of Departure
RETD	Revised Estimated Time of Departure
RETIL	Rapid Exit Taxiway Indicator Lights
RF	Radio Frequency
RFC	Request for Comments
RFL	Requested Flight Level
RFM	Refined Flow Management
RFP	Replacement Flight Plan
RFP	Request For Proposal
RFS	Research Flight Simulator (NLR)
RGS	Remote Ground Station
RH	Right Hand
RHP	Runway Holding Point
RHP	Runway Holding Position
RIA	Runway Incursion Alert
RIAS	Runway Incursion Alerting System
RIASS	Runway Incursion Alert System Schiphol
RIDA	Runway Incursion Detection and Alerting
RIF	Research Infrastructure (EUROCONTROL)
RIMCAS	Runway Incursion Monitoring and Collision Avoidance System (Searidge)
RIMCAS	Runway Incursion Monitoring and Conflict Alerting System (Indra)
RL	Runway (Edge) Lights
RLD	Rijksluchtvaartdienst (former Dutch Department of Civil Aviation)
RM	Requirements Management
RMA	Reliability-Maintainability-Availability
RMAN	Runway Manager
RMCDE	Radar Message Conversion and Distribution Equipment
RMMS	Remote Maintenance Monitoring System
RMP	Radio Management Panel
RMS	Remote Monitoring Subsystem
RMS	Research Methods and Safety (EUROCONTROL)
RMT	Reference Mission Trajectory
RMZ	Radio Mandatory Zone
RNAV	Area Navigation
RNC	Required Navigation Capability
RNDSG	Route Network Development Sub-group
RNP	Required Navigation Performance
RNPC	Required Navigation Performance Capability
ROBT	Required Off-Block Time
RoC/D	Rate of Climb / Descent
ROI	Return on Investment
ROM	Read-only Memory
RORI-OCV	Role of Requirements in Operational Concept Validation
ROT	Runway Occupancy Time
ROVC	Rate of Vertical Change
RP	Reference Point (Surveillance)
RP	Route Planner
RPA	Reported Position Accuracy (Surveillance)
RPA	Runway Protected Area
RPA	Runway Protection Area
RPC	Remote Procedure Call
RPCH	Height of Reference Elevation Phase Centre
RPD	Reported Position Discrimination (Surveillance)
RPF	Route Planning Function
RPL	Repetitive Flight Plan
RPR	Reported Position Resolution (Surveillance)
RPS	Recording and Playback System
RPT	Regular Public Transport
RPT	Routing Process Time (Surveillance)
RPZ	Runway Protection Zone
RRI	Reference Router Implementation
RSA	Runway Safety Area
RSP	Required Surveillance Performance
RSP	Required System Performances
RSTNA	Réseau Spécialisé de Test de la Navigation Aérienne (STNA)
RTA	Required Time of Arrival
RTC	Remote Tower Centre
RTCA	Radio Technical Commission for Aeronautics
RTCS	Recruitment Training Competence and Staffing
RTD	Required Time of Departure
RTD	Research, Technological Development and Demonstration
RTD	Revised Estimated Time of Departure
RTE	Route
RT-HITL	Realtime Hardware In The Loop
RTI	D-RVR Delivery Message
RTI	Runtime Infrastructure
RTM	Requirements Traceability Matrix
RTR	D-RVR Request Message
RTS	Real-Time Simulations
RTS	Remote Tower Service
RTS	Request to Send
RTS	Return to Service
RTT	D-RVR Termination Message
RTUC	Recommended Time Until Next Clearance
RTY	RTD and RWY
RU	Regional Unit
RVA	Reported Velocity Accuracy (Surveillance)
RVR	Runway Visual Range
RVSM	Reduced Vertical Separation Minima
RVV	Runway Visibility Values
RWC	Remain Well Clear (Drones)
RWSL	Runway Status Lights
RWY	Runway
RX	Receiver
S
S	Sierra Time Zone (UTC - 6 hrs.)
S	South
S&M	Sequencing and Merging
SA	Sensitive Area
SA	Situational Awareness
SA/RT	Structured Analyses for Real-time Systems (Design Standard)
SAAM	System for Assignment and Analysis at the Macro Level (EUROCONTROL)
SAC	Single Attached Concentrator
SAC	System Area Code
SAE	Society of Automotive Engineers
SAF	Safety
SAGAT	Situation Awareness Global Assessment Technique
SAGE	Sustainable and Green Engines (CleanSky)
SALS	Short Approach Light System
SALSA	Systèmes d'Assistance à la circulation Locale et au Sol sur les Aéroports (DSNA)
SALSF	Short Approach Light System with Sequenced Flashing Lights
SAM	Multi-Cockpit Simulator (DSNA)
SAM	Safety Assessment Method
SAM	Safety Assessment Methodology (EUROCONTROL)
SAM	Slot Allocation Message
SAMS	SMGCS Airport Movement Simulator
SAOS	Snow Action Override Switch
SAP	Service Access Point (NARSIM)
SAP	System Access Parameters (DL)
SAR	Search And Rescue
SAR	Systems Analysis Recording
SARA	Speed and Route Advisor
SARP	Signal Automatic Radar Processing
SARPs	ICAO Standards and Recommended Practices
SAS	Single Attached Station
SASHA	Situational Awareness Rating Scale for SHAPE (EUROCONTROL)
SASS	Surveillance Analysis Support System
SASS-C	Surveillance Analysis Support System for ATC-Centre (EUROCONTROL)
SAST	Stand Allocation Scheduled Time
SAT	Site Acceptance Test
SATB	Shadow-mode ATM Testbed (ENAV/SELEX)
SATCOM	Satellite Communication
SATCPM	Satellite Voice Air-Ground Calling
SATI	SHAPE Automation Trust index (EUROCONTROL)
SATSA	Swedish Air Traffic Services Academy
SAWRS	Supplementary Aviation Weather Reporting Station
SB	Steering Board
SBAS	Satellite Based Augmentation System
SBM	Steering Board Meeting
SBM	Support Business Management (EUROCONTROL)
SBT	Shared Business Trajectory
SBY	Stand-by (flight status)
SC	Single Center
SC	Stack Controller
SC	Stream Class
SCA	Southern Control Area
SCA	Speed Control Advisor
SCA	Surface Conflict Alerting
SCG	Stakeholder Consultation Group (ECIP)
SCH	Scheduled (flight status)
SCM	System Control and Monotoring
SCN	Scenario (usually for simulation/validation)
SCOB	Scattered Clouds or Better
SCS	Strategy of Concept Systems (FAA)
SCSI	Small Computer System Interface
SD	Situation Display
SD	Software Development
SD	Standard Deviation
SDAT	Sector Design and Analysis Tool (FAA/MITRE)
SDD	Software Design Document
SDD	System Description Document
SDF	Simplified Directional Facility
SDF	Surveillance/Sensor Data Fusion
SDG	Standards Development Group (SISO)
SDP	Simulator Development Programme (EUROCONTROL)
SDP	Software Development Plan
SDP	Surveillance Data Processing
SDPD	Surveillance Data Processing and Distrubution
SDS	Surveillance Data Server
SDT	System Design Team
SDT	Systems Development Team
SDU	Satellite Data Unit (Avionics)
SE	Standard Error
SE	System Engineer
SEAC	SESAR European Airport Consortium
SEC	Seconds
SECASS	Sector Assistant
SEGOPS	Segregated Runway Operations
SEI	Systems Engineering & Integration
SELCAL	Selective Call System
SENASA	Sociedad para las Enseñanzas Aeronáuticas Civiles S.A. (Spanish State-owned Company for Training and Consultancy in Aeronautics)
SERA	SICTA Tower Controller Workload Assessment
SES	Single European Sky
SES	Statement of Execution of Services
SESA	System Element Safety Assessments
SESAME	Single European Sky Implementation Programme
SESAR	Single European Sky ATM Research
SESAR-JU	SESAR Joint Undertaking
SFC	Surface
SFCM	Social Factor Change Management
SFL	Sequenced Flashing Lights
SFL-V	Sequenced Flashing Lights - Variable Intensity
SFM	Simulation Facility Management
SFPL	System Flight Plan
SFST	Stand Free Scheduled Time
SFWA	Smart Fixed Wing Aircraft (CleanSky)
SGI	Strategy (EUROCONTROL)
SGO	Systems for Green Operations
SGS	Surface Guidance Symbology
SGS	Surface Guidance System
SGU	Signal Generator Unit
SHAMAN	System to Help Analysis and Monitoring of ACC Resources and Air Route Network (DSNA)
SHAPE	Solutions for Human Automation Partnership in European ATM (EUROCONTROL)
SI	Système International
SIA	Smiths Industries
SIBT	Scheduled In-Block Time
SIC	System Identification Code
SICAS	SSR Improvements and Collision Avoidance Systems
SICASP	Secondary Surveillance Radar Improvements and Collision Avoidance Systems Panel (ICAO)
SICTA	SICTA Sistemi Innovativi per il Controllo del Traffico Aereo
SID	Standard Instrument Departure
SIGMET	Significant Weather Advisory Service
SIL	Sector Inbound List
SIMDIN	Simulación Dinámica (AENA)
SIMICA	Simulation of Interactively Controlled Aircraft (Server)
SIMMOD	Airport and Airspace Delay Simulation Model (FAA/EUROCONTROL)
SIMSYS	Simulator System for Operational Systems (DFS)
SISO	Simulation Interoperability Standards Organization
SIT1	CFMU Slot Issue Time
SITA	Société International de Télécommunications Aéronautiques
SIU	System Interface Unit
SIWL	Single Isolated Wheel Load
SJU	SESAR Joint Undertaking
SKD	Scheduled
SLA	Service Level Agreement
SLC	Slot Cancellation Message
SLDT	Scheduled Landing Time
SLM	Standard Length Message
SLoA	Stakeholder Lines of Action
SLOT	CTOT -5/+10 Minutes
SLP	Speed Limiting Point
SLR	Secondary Landing Runway
SLS	System Level Specification
SM	Sequence Monitor
SM	Speed Monitoring
SM	State Machine
SM	Statute Miles
SM	System Manager
SMA	Surface Movement Advisor (Free Flight)
SMA	Surface Movement Alerting
SMAN	Surface Manager
SMART	Simulator Multi-role ATM Research and Training (SELEX)
SMART	Specific - Measurable - Actionable - Realistic - Time-oriented
SMC	System Maintenance Console
SMC	System Manager Console
SMC	System Monitoring and Control
SMC-GUI	System Manager's Console Graphical User Interface
SME	Small/Medium Enterprise
SME	Subject Matter Expert
SMGCS	Surface Movement Guidance and Control System
SMMC	System Maintenance Monitoring Console
SMP	Safety Management Plan
SMR	Surface Movement Radar
SMS	Safety Management System
SMS	Surface Movement System
SMS	System Management Station HWCI
SMT	Shared Mission Trajectory
SMT	Surface Movement Tracker
SNAcP	Subnetwork Access Protocol
SNDCF	Subnetwork Dependent Convergence Function (VDL)
SNICP	Subnetwork Independent Convergence Protocol (ATN)
SNMP	Simple Network Management Protocol
SNOWTAM	NOTAM on Snow Conditions
SOA	Service Oriented Approach
SOA	Service Oriented Architecture
SOAP	Simple Object Access Protocol
SOBT	Scheduled Off-Block Time
SOC	Start of Climb
SODALS	Simplified Omnidirectional Approach Lighting System
SOF	Sofréavia
SOLAR	System for Optimizing Landing Air Traffic
SOM	Simulation Object Model
SOP	Standard Operating Procedure
SOPHOS	ESAO Web-based Tool
SOURDINE	Study of Optimisation Procedures for Decreasing the Impact of Noise around Airports
SOW	Statement of Work
SP	Sub-Project
SPAM	Situation Present Assessment Method
SPAR	French Light Precision Approach Radar
SPF	Strategic Performance Framework (EC)
SPI	Surveillance Performance and Interoperability
SPL	System Plan (Server)
SPM	Software Programmers Manual
SPM	Special Message (Flow Management)
SPOR	Services Procedures and Operational Requirements
SPR	Safety and Performance Requirements
SPS	Standard Positioning Service
SPT	Start-Up, Push-Back, Taxi-Clearance Service
SQB	Mode-S Squitter Beacons
SQL	Standard Query Language
SR	Software Review
SR	Sunrise
SRA	Special Rules Area
SRA	Strategic Research Agenda
SRA	Surveillance Radar Approach
SRC	Safety Regulation Commission
SRD	System Requirements Document
SRE	Surveillance Radar Element of Precision Approach Radar System
SRM	Slot Revision Message
SRO	Single Runway Operations
SRR	System Requirement Review
SRS	Software Requirements Specification
SR-SS	Sunrise-Sunset
SRT	System Recording Tape (Server)
SS	Sunset
SSA	Specific Shared Situational Awareness (JPDO-IPT)
SSA	System Safety Analysis
SSALF	Simplified Short Approach Light System with Sequenced Flashing Lights
SSALR	Simplified Short Approach Light System with Runway Alignment Indicator Lights
SSALS	Simplified Short Approach Light System
SSB	Single Sideband
SSC	Single Sky Committee
SSC	Super Stream Class
SSDD	System/Segment Design Document
SSEP	Self Separation
SSL	Secure Socket Layer
SSPM	Software Standards & Procedures Manual
SSR	Secondary Surveillance Radar
SSS	System Segment Specification
STA	Scheduled Time of Arrival
STA	Sequenced Time of Arrival
STAM	Short-term ATFCM Measures
STANS	Simulated Facility of a Total Air Navigation System (EUROCONTROL)
STAR	Safety Target Achievement Roadmap
STAR	Standard Terminal Arrival Route
STARS	Standalone TRACON Automation Replacement System
STARS	Standard Terminal Automation Replacement System
STATFOR	Air Traffic Statistics and Forecast Service (EUROCONTROL)
STC	Supplemental Type Certificate
STCA	Short Term Conflict Alert
STD	Altimeter Setting
STD	Scheduled Time of Departure
STD	Standard
STDM	Statistical Time Division Multiplexing
STDMA	Self-Organizing TDMA
STI	Short-Term Implementation (EUROCONTROL)
ST-IN	Straight-in
STIV	Start Interval (LVNL)
STN	Station
STNA	Service Technique de la Navigation Aérienne
STO	Simulator Training Officer (Pseudo-pilot LVNL)
STOL	Short Take-Off and Landing
STOT	Scheduled Take-off Time
STQ	SHAPE Teamwork Questionnaire (EUROCONTROL)
STTT	Scheduled Turn-around Time (SOBT - SIBT)
SU	System Usability
SUA	Special Use Airspace
SUC	Start-up Controller
SUM	Software Users Manual
SUMI	Software Usability Measurement Inventory (HF Questionnaire)
SUP	Supervisor
SUP	Supplement
SURV	Surveillance
SUS	System Usability Scale
SVC	Switched Virtual Circuit (VDL)
SVS	Synthetic Vision System
SW	Single Wheel Landing Gear
SW	Software
SWAP	Severe Weather Avoidance Procedures
SWC	Significant Weather Chart
SWIM	System Wide Information Management
SYRS	System Requirements Specification
SYSCO	System-Supported Co-ordination
T
T	Tango Time Zone (UTC - 7 hrs.)
T	Terrain Clearance Altitude (MOCA)
T	Training
T	Transmits Only (Radio Frequencies)
T & E	Test and Evaluation
T/O	Take Off
T0	Start Date (Time = 0)
T3	TAR/TTS/TES
TA	Technical Annex
TA	Traffic Advisory (TCAS)
TA	Transition Altitude
TAA	Terminal Arrival Area
TAAM	Total Airspace and Airport Modeller
TAC	Technical Assitance Contractor
TACAN	Tactical Air Navigation
TACOT	Tactical Operational Tool (EUROCONTROL)
TACT	Tactical (Flow Management) System
TAF	Terminal Area Forecasts Service
TALIS	Total Information Sharing for Pilot Situational Awareness (EUROCONTROL)
TAR	Terminal Approach Radar
TAR	Terminal Area Radar
TAR	TRACON Acceptance Rate
TAR	Trials ATN Router
TARDIS	Time And Relative Dimensions In Space
TARGETS	Terminal Area Route Generation, Evaluation, and Traffic Simulation
TARMAC	Taxi And Ramp Management And Control
TAS	True Air Speed
TATCA	Terminal Air Traffic Control Automation
TATM	Thales ATM
T-ATSU	Transferring ATSU
TBC	To Be Checked
TBC	To Be Confirmed
TBD	To Be Defined
TBD	To Be Determined
TBD	To Be Documented
TBEC	Thrust Based Emission Calculator (NLR)
TBR	To Be Resolved
TBS	To Be Supplied
TC	Tactical Controller
TC	Transport Connection
TCA	Terminal Control Area
TCAS	Traffic Alert and Collision Avoidance System (FAA)
TCC	Technical Co-ordination Committee
TCD	Traffic Conflict Detection
TCDS	Type Certificate Data Sheets (FAA)
TCH	Threshold Crossing Height
TCL	Tool Command Language
TCM	Taxiway Collision/Conflict Monitoring
TCM	Time and Clock Management
TCM	Trajectory Conformance Monitoring
TCO	Technical Co-ordinator
TCP	Trajectory Change Point
TCP/IP	Transmission Control Protocol/Internet(work) Protocol
TCP-IP	Transport Control Protocol - Internet Protocol
TCTA	Transcontinental Control Area
TDD	Technical Design Directives
TDLS	Tower/Surface ATC Data Link Services
TDMA	Time Division Multiple Access
TDOA	Time Difference of Arrival
T-DPI	Target Departure Planning Information Message
TDR	Time Discounting Rate
TDU	Training and Development Unit (NATS)
TDWR	Terminal Doppler Weather Radar
TDZ	Touchdown Zone
TDZE	Touchdown Zone Elevation
TE	Technology Evaluator (CleanSky)
TEA	Toolset for Emission Analysis (NLR)
TEC	Tower Executive Controller
TEC	Training and Education Centre
TECAMS	Technical Control and Monitoring System
TECOS	Terminal Co-ordination System (THALES)
TED	Trajectory Editor
TEFA	The Environmentally Friendly Aircraft (EU)
TEMO	Time and Energy Managed Operations
TEMP	Temporary
TEMP	Test & Evaluation Master Plan
TEN-T	Trans European Network for Transport
TERP	Standard for Terminal Instrument Procedure (U.S.)
TERPS	Terminal Procedures
TES	Trials End System (ATN)
TFL	Transfer Flight Level
TFM	Traffic Flow Management
TFV	Traffic Volume (Flow Management)
TGM	Trajectory Generation Management
TGUI	Timeline Graphical User Interface
THEATRE	Thematic Network on ATM Research Validation
THR	Threshold
TIAT	Target Initial Aspproach Fix Time
TIB	Time Interval at Boundary
TIBA	Traffic Information Broadcast by Aircraft
TID	Touch Input Device (ATCo)
TIM	Technical Interchange Meeting
TIS	Terminal/Traffic Information Services
TIS-B	Traffic Information Service-Broadcast
TIU	TATCA Interface Unit
TIU-I	TIU Interface CSCI
TIU-S	TIU Software CSCI
TIZ	Traffic Information Zone
TK	Tool Kit
TL	Transition Level
TLC	Theoretical Landings Capacity
TLDT	Target Landing Time
TLP	Tactical Leadership Programme
TLS	Tactical Load Smoother
TLX	Task Load Index (NASA Workload Assessment Method)
TLZ	Time Limited Zone
TM	Terminal Manager
TM	Trajectory Management
TMA	Terminal Manoeuvring Area
TMA	Traffic Management Advisor
TMA-SC	Traffic Management Advisor-Single Center (ATM)
TMC	Thrust Management Computer
TMC	Traffic Management Co-ordinator
TMC-GUI	Traffic Management Coordinator-Graphical User Interface CSCI
TMI	Traffic Management Systems Interface CSCI
TML	Terminal
TMN	Terminates
TMR	Trajectory Management Requirements
TMS	Traffic Management Station HWCI
TMS	Traffic Management System
TMU	Traffic Management Unit
TMZ	Transponder Mandatory Zone
TN	Trajectory Negotiation (DL)
TOBT	Target Off-Block Time
TOC	Top of Climb
TOC	Transfer of Control
TOD	Top of Descent
TODA	Take-off Distance Available
ToHMI	Tower HMI (NARSIM)
TOPAZ	Traffic Organisation and Perturbation Analyser
ToR	Terms of Reference
TOR/TORA	Tower and Radar Simulator (SATSA)
TORA	Take-off Run Available
TORCH	Technical, Economical and Operational Assessment of an ATM Concept Achievable from the Year 2005
TOSIM	Tower Simulator (DFS)
TP	Trajectory Predictor
TP	Transport Protocol
TPC	Tower Planning Controller
TPDU	Transport Protocol Data Unit
TPL	Total Path Length
TR	Trajectory Re-planning
TRA	Temporary Reserved Airspace
TRA	Temporary Reserved Area
TRACON	Terminal Radar Approach Control
TRADEF	Tracker Development Facility (NLR)
TRAFGEN	Traffic Generator (AENA)
TRAFSIM	Traffic Simulator (DLR)
TRAJ	Trajectory
TRANSPAC	French Network Provider
TRASS	Terminal Resource Allocation System Schiphol
TRCV	Tri-Color Visual Approach Slope Indicator
TRD	Technical Requirements Document
TRD	Transit Routing Domains
TREC	Tracking Radar Echos by Correlation
TREN	Transport and Energy (EC Directorate General)
TRL	Technology Readiness Level
TRLC	Theoretical Runway Landings Capacity
TRNSG	Testing of Radio Navaids Study Group (ICAO)
TRR	Test Readiness Review
TRS	Task Requirement Sheet (EUROCONTROL)
TRS	Tower Research Simulator (NLR)
TRSB	Time Reference Scanning Beam
TRUR	Target Report Update Rate (Surveillance)
TS	Technical Specification
TS	Trajectory Synthesis CSCI
TS	Transport Service
TS	Troubleshooter
TSA	Temporary Segregated Area
TSA	Terminal Service Area
TSA	Traffic Situational Awareness
TSAT	Target Start-up Approval Time
TSD	Time Sequence Diagram
TSD	Traffic Situation Display
TSDU	Transport Service Data Unit
TSE	Transition Segment to En-route (SID)
TSR	Test Status Review
TTA	Target Time of Arrival
TTD	Target Time of Departure
TTIA	Taiwan Taoyuan International Airport
TTMA	Terminal Traffic Management Advisor
TTMC	TRACON Traffic Management Coordinator
TTO	Target Time Over
TTOT	Target Take-off Time
TTS	Trials Transport Services (ATN)
TTW	Time to Waypoint
TU	Technical University
TV	Traffic Volume
T-VASI	Tee Visual Approach Slope Indicator
TVOR	Terminal VOR
TWDL	Two Way Datalink
TWEB	Transcribed Weather Broadcast
TWI	Two-Way Interface
TWIP	Terminal Weather Information for Pilots
TWLU	Terminal Wireless LAN Unit
TWO	Technical Workshop
TWR	Aerodrome Control Tower
TWY	Taxiway
TX	Transmitter
TXI	Taxi-in (flight status)
U
U	Uniform Time Zone (UTC - 8 hrs.)
U/S	Unserviceable
UAC	Upper Area Control
UACC	Upper Area Control Centre
UAS	Unmanned Aircraft Systems
UAT	Universal Access Transceiver (966 MHz)
UBSS	UNIX Basic System Software
UC	Use Case
UCO	Under Control
UDP	Uniform Daylight Period
UDP	User Datagram Protocol
UDPP	User Driven Prioritisation Process (CDM)
UF	User Forum
UFN	Until Further Notice
UHF	Ultra High Frequency
UI	User Interface
UIR	Upper Flight Information Region
UL	Upper Layers
ULA	Upper Layer Architecture
UM	Unit Management
UMAS	Unmanaged Airspace
UML	Unified Modelling Language
UMTS	Universal Mobile Telecommunications Systems
UN	United Nations
UNARIX	Utilisation of NARSIM for INTEGRA Execution Phase
UNCTL	Uncontrolled
UNICOM	Aeronautical Advisory Service
UNL	Unlimited
UP4DT	User Preferred 4D Trajectory
UPR	User Preferred Routing
UPS	Uninterruptible Power Supply
URD	User Requirements Document (EUROCONTROL)
URET	User Request Evaluation Tool (Conflict Evaluation)
URG	Urgency Message Attribute (CPDLC)
USAF	US-Air Force
USB	Universal Serial Bus
USB	Upper Sideband
USN	US-Navy
USR	User Requirement
UT	Universal Time
UT0	Universal Time Zero (Mean Solar Time on Greenwich Meridian)
UT1	Universal Time One (UT0 Polar Motion Correction)
UT2	Univeral Time Two (UT1 Rotation Correction)
UTA	Upper Control Area
UTC	Universal Time Co-ordinated
UTP	Unit Training Plan
UUP	Updated Airspace Use Plan
V
V	Validation Lifecycle Phase (E-OCVM)
V	Victor Time Zone (UTC - 9 hrs.)
V&V	Verification and Validation
V/V	Vertical Velocity
V1	Take-off Decision Speed
V2	Minimum Take-off Safety Speed at 35 Feet AGL
VAA	Value Added Applications
VAFC	Volcanic Ash Forecast Chart
VAL	Validation
VALERY	Study for the Development of a Prototype Validation Repository
ValFor-SB	Validation Forum Supervisory Board
VAMS	Virtual Airspace Modeling and Simulation (NASA)
VAR	Magnetic Variation
VARTAN	Validation Reporting Template Analysis by NLR
VASI	Visual Approach Slope Indicator
VBA	Visual Basic for Applications
VBC	Virtual Block Control
VCI	Voice Change Instruction
VCR	Visual Control Room
VDB	VHF Data Broadcast
VDD	Version Description Document
VDF	VHF Direction Finder
VDGS	Visual Docking Guidance System
VDL	VHF Datalink
VDL/2	VHF Datalink Mode 2
VDL2	VHF Datalink Mode 2
VDL-2	VHF Datalink Mode 2
VDP	Visual Descent Point
VDR	Validation Data Repository
VDR	VHF Data/Digital Radio (Avionics)
VDS	Vehicle Detection System
VDV	Voorschrift Dienst Verkeersleiding (Dutch Regulations for Air Traffic Services)
VE	Verification
VE	Visual Exempted
VEMER	Veiligheid, Efficiency en Milieu Effect Rapportage (Safety, Efficiency and Environmental Impact Reporting)
VenW	Ministerie van Verkeer en Waterstaat (Dutch Ministry of Transport, Public Works and Water Management)
VESA	Vortex Encounter Severity Assessment
VFR	Visual Flight Rules
VGA	Variable Geometry Airspace
VGH	Validation Guideline Handbook (MAEVA)
VGSI	Visual Glide Slope Indicator
VHA	Volcanic Hazard Area
VHF	Very High Frequency (30-300 MHz)
VIS	Visibility
VMC	Visual Meteorological Conditions
VME	VDL Management Entity
VMP	Validation Master Plan (MAEVA)
VNAP	Vertical Noise Abatement Procedures
VNAV	Vertical Navigation
VO	Vehicle Operator
VoIP	Voice over Internet Protocol
VOLMET	Meteorological Information for Aircraft in Flight
VOR	Very High Frequency Omni-Directional (Radio) Range
VORTAC	VOR and TACAN Co-located
VOT	Radiated Test Signal (VOR)
VPA	Variable Profile Area
VR	Rotation Speed
VRTM	Verification Requirements Traceability Matrix
VSA	Visual Separation on Approach
VSAT	Very Small Aperture Terminal
VSB	Virtual Stop Bar
VSDF	Video Sensor Data Fusion
VSP	Variable System Parameter
VSS	VDL Specific Services
VTOL	Vertical Take-Off and Landing
VTT	Variable Taxi Time
VTTC	Variable Taxi Time Calculation
VV	Vertical Visibility
VVD	Vertical View Display
W
W	West
W	Whiskey Time Zone (UTC - 10 hrs.)
W/O	Without
W/P	Way Point
WAAS	Wide Area Augmentation System
WACS	Wireless Airport Communication Systems
WADGNSS	Wide Area Differential Global Navigation Sattelite System
WAM	Wide Area Multilateration
WAN	Wide Area Network
WARP	NLR ATCoDis Redesign Project
WBS	Work Breakdown Structure
WCF	Wind Correction Factor
WECA	Wireless Ethernet Compatibility Alliance
WEP	Wired Equivalency Privacy
WG	Working Group
WG53	EUROCAE Working Group 53 (ATS)
WGS	World Geodetic System
WI	Work Item
WILCO	Will Comply (R/T)
WIS	Wind Indicator System
WIT	Workgroup Internet Tool (MAEVA)
WLAN	Wireless Local Area Network
WLANA	Wireless LAN Alliance
WLIF	WLAN Interoperability Forum
WMAN	Wireless Metropolitan Area Network
WMF	Windows Metafile
WOC	Wing Operations Centre
WP	Work Package (of Project)
WPL	Work-Package Leader
WPM	WP Meeting
WPT	Way-Point
WSDL	Web Services Description Language
WSU	West South Upper (Sector)
WT	Water Tank
WTC	Wake Turbulence Category
WTP	Weather and Traffic Permitting
WU	Workload Units
WV	Wake Vortex
WWW	World Wide Web
WX	Weather
WX	Weather Sytems Interface CSCI
WXR	Weather Radar
X
X	On Request
X	X-ray Time Zone (UTC - 11 hrs.)
X11	X Window System, Version 11
XDR	External Data Representation
XFL	(Sector) Exit Flight Level
XID	Exchange Identity (VDL Mode 4)
XM	Execution Manager CSCI
XML	Extensible Mark-up Language
XNOTAM	Digital NOTAM
XPDR	Transponder
XPT	(Sector) Exit Point
XSLT	Extensible Stylesheet Language for Transformations
XSW	Experiment Switches (GRACE)
Y
Y	Yankee Time Zone (UTC - 12 hrs.)
Z
Z	Zulu Time Zone (UTC)
ZSA	Zonal Safety Analysis