1090 ES 1090 MHz Extended Squitter
3D, 4D 3 or 4 Dimension
2EP Two Eyes Principle
4EP Four Eyes Principle
5LNC Five Letter Naming Codes


AA Approved Agency
AAC a) Airline Administrative Control
b) Aeronautical Administrative Communication
AAS Advanced Avionics System
ABI Advanced Boundary Information Message
ASN.1 ACARS Abstract Syntax Notation One – ACARS
AC Advisory Circular
ACARE Advisory Council for Aeronautics Research in Europe
ACAS Airborne Collision Avoidance System
ACC Area Control Centre
ACE ATM and CNS System Engineering (an EEC Centre of Expertise)
ACF ACARS Convergence Function
ACG ATM/CNS Consultancy Group
ACI Airports Council International
ACID Aircraft Identification
ACK Acknowledgement
AD Application Description
ADDI Automated Digital Data Interchange
ADEP Airport of Departure
ADES Airport of Destination
ADI Aggregate Demand Indicators
ADLP Airborne Data Link Processor
ADNS ARINC Data Network Service
ADOP ICAO Aerodrome Design and Operations Panel
ADPCM Adaptive Differential Pulse Code Modulation
ADS Automatic Dependent Surveillance
ADS-B Automatic Dependent Surveillance Broadcast
ADS-C Automatic Dependence Surveillance Contract
ADSF Automatic Dependent Surveillance Function
ADSU Automatic Dependent Surveillance Unit or ADS Unit
AECMA Association Européenne des Constructeurs de Matériel Aérospatial
(European Association of Aerospace Industries)
AEEC Airlines Electronic Engineering Committee
AELTS ICAO’s Aviation English Language Test Service
AENA Aeropuertos Españoles y Navegación Aérea
(Spanish Airports and Air Navigation)
AES Aircraft Earth Station
AFC ATC Frequency Change service
AFE Africa East
AFIS Automated Flight Inspection System
AFL Actual Flight Level
AFM Africa and Middle East
AFP Air Traffic Control Flight Plan Proposal
AFS Aeronautical Fixed Service
AFTN Aeronautical Fixed Telecommunication Network
AGAS Action Group for ATM Safety
AGL Above Ground Level
AIDC ATC Interfacility Data Communications
AIDS Acquired Immune Deficiency Syndrome
AIP Aeronautical Information Publication
AIRMET Airmen’s Meteorological Information
AIS Aeronautical Information Service(s)
AKN Acknowledgement
AL Alerting Service
AMA Americas
AMC Airspace Management Cell
AMJ Advisory Material-Joint
AMS Apron Management Services
AMSS Aeronautical Mobile Satellite Service
AMWG Airspace Management Working Group
ANACNA Associazione Nazionale Assistenti e Controllori della Navigazione Aerea
ANC ICAO Air Navigation Commission
AN-Conf/11 Eleventh Air Navigation Conference
ANM ATFM Notification Message
ANP Actual Navigation Performance
ANS Air Navigation Services
ANSP Air Navigation Service Provider
ANT Air Navigation Team
AO Aircraft Operator
AOC a) Aeronautical Operational Control
b) Aircraft Operational Control
c) Aircraft Operations Centre
d) Airline Operational Communications System
e) Airline Operations Centre
AOPG Aerodrome Operations Group
AOT Aerodrome Operations Team
APANPIRG ASIA/PAC Air Navigation Planning and Implementation Regional Group
APC a) Aeronautical Passenger Communications
b) Aeronautical Public Correspondence
APDSG ATM Procedures Development Sub-Group
APIWP Approach Intercept Waypoint
APL Abbreviated Flight Plan
APM Associate Professional Membership
APP Approach Control
APRs Automatic Position Reports
APT Airport Throughput (an EEC Research Area)
APW Area Proximity Warning
ARCW ADS Route Conformance Warning
ARINC Aeronautical Radio Incorporation
ARO ATS Reporting Office
ARR Arrival message
ARTAS a) Air Traffic Management Surveillance Tracker and Server System
b) ATC Radar Tracker and Server
ARTCC Air Route Traffic Control Centre
AS Airborne Surveillance
ASA Aircraft Surveillance Applications
ASAS Airborne Separation Assistance System
ASAS TN Airborne Separation Assistance System Thematic Network
ASBU Airspace Block Upgrades
ASD Air Situation Display
ASDE-X Airport Surface Detection Equipment Model X
ASECNA Agency for the Security of Aerial Navigation in Africa and Madagascar
ASM Airspace Management
A-SMGCS Advanced Surface Movement Guidance and Control System
ASMT Air Traffic Control Safety Monitoring Tool
ASN.1 Abstract Syntax Notation One
ASP Asia and Pacific
ASPA-S&M Enhanced Sequencing and Merging Operations
ASTERIX All Purpose STructured Eurocontrol suRveillance Information EXchange
ATA Air Transport Association
ATAR Automatic Air Reporting
ATC Air Traffic Control, Air Traffic Control Domain
ATCC Air Traffic Control Centre
ATCComm Air Traffic Control Communications Systems (Hardware & Software)
ATCEUC Air Traffic Controllers European Unions Coordination
ATCO Air Traffic Control Officer
ATCS Air Traffic Control Services
ATD Along-Track Distance
ATFM Air Traffic Flow Management
ATIS a) Air Traffic Information Service
b) Airport Terminal Information Service
c) Automated Terminal Information Service
ATLAS Australian Transition to Satellite Technology
ATM Air Traffic Management
ATMOPSP ICAO ATM Operations Panel
ATMRPP ICAO Air Traffic Management Requirements and Performance Panel
ATN Aeronautical Telecommunications Network
ATO Actual Time Over
ATRK Along-Track Error
ATS Air Traffic Service(s)
ATSA-AIRB Enhanced traffic situational awareness during flight operations
ATSA-S&A Enhanced visual acquisition for see & avoid
ATSA-SURF Enhanced traffic situational awareness on the airport surface
ATSA-SVA Enhanced successive visual approaches
ATSAW Airborne Traffic Situation Awareness
ATSC Air Traffic Services Communication
ATS-PM ICAO Doc 9426 – Air Traffic Services Planning Manual
ATSU Air Traffic Service Unit
AUP Airspace Use Plan
AUSEP Australian RNAV Standard
AVPAC Aviation VHF Packet Communications
BDS Comm-B Data Store
BER Basic Encoding Rules
BRL Bearing Range Line
B-RNAV Basic Area Navigation


C/A Course Acquisition Code
C/I Carrier-to-Interference Ratio
C/N Carrier-to-Noise Ratio
CAA a) Civil Aviation Administration
b) Civil Aviation Authority
CAASD Centre for Advanced Aviation System Development (The MITRE Corporation)
CADF Centralised Airspace Data Processing Function
CANSO Civil Air Navigation Services Organisation
CAR Caribbean
CASA Civil Aviation Safety Authority (Australia)
CASCADE Co-Operative ATS through Surveillance & Communication Applications Deployed in ECAC
CAT Data Category
CATMAC Co-operative Air Traffic Management Concept
CBA a) Cost/Benefit Analysis
b) Cross-Border Area
CBI Computer Based Instruction
CC Connection Confirm
CCIR International Radio Consultative Committee
CCITT International Telegraph and Telephone Consultative Committee
CCO Continuous Climb Operations
CDA Continuous Descent Approaches
CDI Course Deviation Indicator
CDM Collaborative Decision Making
CDO Continuous Descent Operations
CDR Conditional Route
CDSNs Conflict Detection Safety Nets
CDTI Cockpit Display of Traffic Information
CDTs Conflict Detection Tools
CEATS Central European Air Traffic Services
CEO Chief Executive Officer
CFMU Central Flow Management Unit (EUROCONTROL, replaced by NMOC)
CHI Computer Human Interface
CIB Controller Intervention Buffer
CIC a) Controller Intervention Capability
b) Controller in Charge
CIDIN Common ICAO Data Interchange Network
CIMIC Civil/Military Interface Standing Committee
CIP Convergence and Implementation Plan
CIS a) Critical Incident Stress
b) Co-operative Independent Surveillance
CISM Critical Incident Stress Management
CLAM Cleared Level Adherence Monitoring
CLNP Connectionless Network Protocol
CM Context Management
CMC Civil/Military Cooperation
CMG Controller Management Group
CMU a) Communications Management Unit
b) Context Management Unit
CNS Communication Navigation and Surveillance
CNS/ATM Communication, Navigation, Surveillance/Air Traffic Management
CoE Centre of Expertise
COM Communications
COM/MET/OPS Communications/Meteorology/Operations
Connection Transport Layer Relationship between peer end-systems.
CONUS Continental United States
COTS Commercial Off-The-Shelf
CP ICAO Communications Panel
CPDLC Controller Pilot Data Link Communications
CR Connection Request
CRAM Conditional Route Availability Message
CRC Cyclic Redundancy Check
CRDA Converging Runway Display Aid
CRDS CEATS Research and Development Simulation Centre
CRM a) C Reference Model
b) Collision Risk Modelling
c) Crew Resource Management
CROPS Converging Runway Operations
CRT Cathode Ray Tube
CSE Course Setting Error
CTA a) Control Area
b) Calculated Time of Arrival
CTMO Centralised Traffic Management Organisation
CTs Controller Tools
CW Carrier Wave
CWI Continuous Wave Interference


D, R, P Areas Danger, Restricted and Prohibited Areas
DA/H Decision Altitude (Height)
DAI Development and Integration (an EEC Centre of Expertise)
DARPS Dynamic Air Route Planning System
D-ATIS Digital Automatic Terminal Information Service
dBm The dBm is the unit of absolute power related to 1 milliwatt
DCE Data Circuit-Terminating Equipment
DCIA Dependent Converging Instrument Approach
DCL Departure Clearance Delivery
DCPC Direct Controller Pilot Communication
DDM Difference Depth of Modulation (ILS)
DFDAU Digital Flight Data Acquisition Unit
Dg Degree
DGCA Director-General Civil Aviation
DGNSS Differential GNSS
DGPS Differential Global Positioning System
DIAS Differential GNSS Instrument Approach System
DL a) Data Link
b) Downlink
DLAC Data Link Applications Coding
DLORT FAA Data Link Operational Requirements Team
DME Distance Measuring Equipment
DO Document
DOP Dilution of Precision
DOTS Dynamic Ocean Tracking System
DP Deputy President
DPF Data Processing Function
DPSK Differential Phase Shift Keying
DR Disconnect Request
DRMS Distance Route Mean Square
DT Data
DTF Data Test Facility


E. I. Employee Involvement
EANPG ICAO European Air Navigation Planning Group
EAP Employee Assistant Programme
EASA European Aviation Safety Agency
EASIE Enhanced ATM and Mode S Implementation in Europe
EATCHIP European Air Traffic Control Harmonisation and Integration Programme
EATM EUROCONTROL Programme for Performance Enhancement in European Air Traffic Management
EC European Commission
ECA European Cockpit Association
ECAC European Civil Aviation Conference
ECCG Experimental Centre Consultation Group
EEC a) European Economic Community
b) EUROCONTROL Experimental Centre
EET Estimated Elapsed Time
EFAS Extended Final Approach Segment
EFIS Electronic Flight Information System
EFR Electronic Flight Rules
EGOA Enhanced General Aviation Operations
EHS Electromagnetic Hyper Sensitivity
EMC Electromagnetic Compatibility
EMF Electro Magnetic Fields
EMI Electromagnetic Interference
ENAV Italian company for Air Navigation Services
ENRI Electronic Navigation Research Institute
ER Error
ERN Earth Referenced Navigation
ERP Effective Radiated Power
ESA European Space Agency
ESARR EUROCONTROL Safety Regulatory Requirements
ESOPS Employee Share Option Schemes
EST Estimate message
ETA Estimated Time of Arrival
ETB Estimated Time at Boundary
ETD Estimated Time of Departure
ETN Estimated Time of Entry
ETO Estimated Time Over
ETODA Estimated Time Over Deviation Alert
EU European Union
EUC Europe Central
EUR Europe
EURET European Transport
EUROCAE European Organisation for Civil Aviation Equipment
EUROCONTROL European Organisation for the Safety of Air Navigation
EUW Europe West
EVP Executive Vice President
EVP AFM Executive Vice President Africa and Middle East
EVP AMA Executive Vice President Americas
EVP ASP Executive Vice President Asia and Pacific
EVP EUR Executive Vice President Europe
EVPF Executive Vice President Finance
EVPP Executive Vice President Professional
EVPT Executive Vice President Technical


FAA Federal Aviation Administration
FAB Functional Airspace Blocks
FAF Final Approach Fix
FANS ICAO Future Air Navigation Systems
FAR Federal Aviation Regulation
FAS Final Approach Segment
FAST Future ATM Systems Team
FDI Fault Detection and Isolation
FDP Flight Data Processing
FDPS Flight Data Processing System
FDR Flight Data Record
FEC Forward Error Correction
FF-ICE Flight and Flow – Information for a Collaborative Environment
FGCC Federal Geodetic Control Committee
FIFO First In – First Out
FIIG Federation of International Institutions of a semi-official or private nature (Geneva)
FIR Flight Information Region
FIS Flight Information Services
FIS-B Flight Information Services Broadcast
FL Flight Level, unit of altitude (expressed in 100’s of feet)
FLID Flight Identification
FLAS Flight Level Allocation Scheme
FLTOPSP ICAO Flight Operations Panel
FM Frequency Modulation
FMC Flight Management Computer
FMD Flow Management Division (CFMU)
FMEA Failure Mode Effects Analysis
FMP Flow Management Position
FMS Flight Management System
FMU Flow Management Unit
FOM Figure of Merit
FPA Flight Path Angle
FPD Flight Plan Data
FPL Flight-Plan
FPPS Flight Plan Processing System
FRA Free Route Airspace
FRAC Free Route Airspace Concept
FRAP Free Route Airspace Project
FRMS Fatigue Risk Management Systems
FRN Field Reference Number
FS Functional Statement
FSMP Frequency Spectrum Management Panel
FSPEC Field Specification
FTE Flight Technical Error
FTI FUA Temporary Instruction
FTS Fast-time Simulation
FUA Flexible Use of Airspace
FX Field Extension Indicator


GA General Aviation
GADS Generic Aircraft Display Systems
GAIT Ground-based Augmentation and Integrity Technique
GAT General Air Traffic
GDLP Ground Data Link Processor
GDOP Geometric Dilution of Position
GEO Geostationary
GES Ground Earth Station
GIC GNSS Integrity Channel
GICB Ground-initiated Comm-B
GIRU Ground Interrogator Receiver Unit
GLONASS Global Navigation Satellite System (Russian Federation)
GM Guidance Material
GNSS Global Navigation Satellite System(s)
GNSS PSG EUROCONTROL GNSS Programme Steering Group
GOS Grade of Service
GOSIP Government Open Systems Interconnection Profile
GPIWP Glide Path Intercept Waypoint
GPS Global Positioning System
GPWS Ground Proximity Warning System
GRAS Ground-based Regional Augmentation System
GREPECAS Caribbean/South American Planning and Implementation Regional Group
GS Ground Speed
GWS Graphic Weather Service


HALE High Altitude Long Endurance
HARN High Accuracy Reference Network
HAT Height Above Touchdown
HCI Human Computer Interface
HDLC High-Level Data Link Control
HDOP Horizontal Dilution of Precision
HELI Helicopter Operations
HEO Highly Elliptical Orbit
HF High Frequency
HFS Human Factors Specialist
HIV Human Immune-deficiency Virus
HMI Human Machine Interface
HPF Horizontal Position Fix Error
HRM Human Resource Management
HRT EUROCONTROL Human Resources Team
HRT TFG EUROCONTROL Human Resources Team Training Focus Group
HRT/HFSG EUROCONTROL Human Resources Team Human Factors Work Group
HSI Horizontal Situation Indicator
HUPER Human Performance


IA5 International Alphabet #5
IAF Initial Approach Fix
IAG International Aviation Group
IAIN International Association of Institutes of Navigation
IANS Institute of Air Navigation Services
IAP Instrument Approach Procedure
IAS Indicated Airspeed
IAS TF A /B Implementation of Airspace Strategy Task Force A & B
IATA International Air Transport Association
ICAEA International Civil Aviation English Association
ICAO International Civil Aviation Organisation
ICB Industry Consultation Body (European Commission)
ICCAIA International Coordinating Council of Aerospace Industries Associations
ICD Interface Control Document
ICD GPS-200B- PR NAVSTAR GPS Space Segment/Navigation User Interface Control
ICISF International Critical Incident Stress Foundation
ID a) Identifier
b) Identification
IFALPA International Federation of Airline Pilots’ Associations
IFATCA International Federation of Air Traffic Controllers’ Associations
IFATSEA International Federation of Air Traffic Safety Electronics Associations
IFER In-Flight Emergency Response
IFPP ICAO Instrument Flight Procedures Panel
IFPS Integrated Initial Flight Plan Processing System
IFR Instrumental Flight Rules
IFRB International Frequency Registration Board
IHB Information Handbook
ILO International Labour Organisation
ILS Instrument Landing System
IM Information Material
IMAWP Initial Missed Approach Waypoint
IMC Instrument Meteorological Conditions
IN Information Need
INMARSAT International Maritime Satellite Organisation
INO Innovative Research (an EEC Research Area)
INS a) Inertial Navigation System
b) Insert
IOACG Informal Indian Ocean Air Traffic Services Coordinating Group
IOC Initial Operational Capability
IOD GPS Issue of Data
ION Institute of Navigation
IP Internetwork Protocol
IRS Inertial Reference System
ISDN Integrated Services Digital Network
ISO International Standards Organisation
ISPACG Informal South Pacific ATS Co-Ordination Group
ITF International Transport Workers’ Federation
ITU International Telecommunication Union
ITWS Integrated Terminal Weather Service
IWP Interim Working Party


JC Just Culture
JCAB Japan Civil Aviation Bureau
JPB Joint Programme Board
KPI Key Performance Indicator
kt Knot: NM/hour, unit of speed


LADGNSS Local Area Differential GNSS
LAN Local Area Network
LAT/LONG Latitude / Longitude
LEN Length Indicator
LEO Low Earth Orbit
LOEU Liaison Officer European Union
LOIG Liaison Officer to International Organisations in Geneva
LOSA Line Operations Safety Audit
LPC Linear Predictive Coding
LPO Lone Person Operation
LPRI ICAO Language Proficiency Requirements Implementation
LRU Line Replaceable Unit
LSB Least Significant Bit
LVA Large Vertical Aperture
LVO Low Visibility Operations


MA Member Association
MADAP Maastricht Automated Data Processing and Display System
MAEVA Master ATM European Validation Plan
MALE Medium Altitude Long Endurance
MAP Missed Approach Point
MAPt Missed Approach Point
MASPS Minimum Aviation System Performance Standards
MB Message, Comm B
MBI Message Block Identifier
MBS Model Based Simulations
MCDU Multifunction Control Display Unit
MET Meteorological
METP ICAO Meteorology Panel
MFF Mediterranean Free Flight Programme
MID Middle East
MIFR Master International Frequency Registration
MLS Microwave Landing System
MLAT Multilateration
MMI Man-Machine Interface
MNC Multi -National Corporations
MNPS Minimum Navigation Performance Specification
MNT Mach Number Technique
MOC Mean of Compliance
MODE S Mode Select Transponder
Mode S PSG Mode S Programme Steering Group
MONA Monitoring Aids
MOPS Minimum Operating Performance Standards
MRT Multi-Radar Tracking
MRT-VU Multi-Radar Tracking using Variable Update
MRVA Minimum Radar Vector Altitude
MSAW Minimum Safe Altitude Warning
MSB Most Significant Bit
MSSP Mobile Satellite Service Provider
MSE Mean Square Error
MSK Minimum Shift Keying
MSP a) Mode S Specific Protocolb) Multi Sector Planning
MSSR Monopulse Secondary Surveillance Radar
MTBA Mean Time Between Alarm
MTBF Mean Time Between Failures
MTBO Mean Time Between Outage
MTBW Mean Time Between Warning
MTCA Medium Term Conflict Alert
MTCD Medium Term Conflict Detection
MTD Moving Target Detection
MTN MEGA Transport Network
MTSAT Multi-Functional Transport Satellite
MTTR Mean Time to Restore
MU Management Unit
MWARA Major World Air Route Area


NA Not Applicable
NACK Negative Acknowledgement
NAD North American Datum
NADIN National Airspace Data Interchange Network
NASA National Space Agency
NAT North Atlantic
NAT ADSG North Atlantic Automatic Dependent Surveillance Development Group
NAT ATS North Atlantic Air Traffic Services
NATO North Atlantic Treaty Organisation
NATSPG ICAO North Atlantic Systems Planning Group
NAVAID Navigational Aid
NAVD North American Vertical Datum
NCA North and Central America
NCD Network Capacity and Demand Management (an EEC Research Area)
NDA Next ATC Data Authority as authorised by the current ATC Data Authority
NGRS National Geodetic Reference System
NGS National Geodetic Survey
NIST National Institute of Standards and Technology
NM Nautical Mile, unit of distance (1852 metres)
NMOC Network Manager Operations Centre (EUROCONTROL, previously CFMU)
NOPAC North Pacific
NOSS Normal Operations Safety Survey
NOTAM Notice to Airmen
NPDU Network Protocol Data Unit
NSC Network Service Centre
NSDU Network Service Data Unit
NSP ICAO Navigation Systems Panel
NUAC Nordic Upper Air Centre
NUP II North European Update Programme Phase II


O.R. Operational Requirement
OAS Oceanic Automation System
OAT Operational Air Traffic
OCA Oceanic Control Area
OCM Oceanic Clearance Message
OCVM Operational Concept Validation Methodology
OCVSD Operational Concept Validation Strategy Document
ODAPS Oceanic Display and Planning System
ODF Oceanic Development Facility (FAA Technical Centre)
ODIAC Operational development of Integrated Surveillance & Air/Ground Data Communications
ODL Oceanic Data Link
OJT On-The-Job-Training
OLDI On-line Data Interchange
Op Operational
OP SUP Operational Supervisor
OPD Optimized Profile Descents
OPMT Operations Planning Management Team
OPS a) Operationsb) Operational Services (an EEC Centre of Expertise)
ORI Orientation
OSED Operational Services and Environment Description
OSI a) Open System Interfaceb) Open Systems Interconnection
OSST FAA Oceanic Separation Standards Team
OTC Overseas Telecommunications Company


PAC Pacific
PACOTS Pacific Organized Track System
PANS-ABC Procedures for Air Navigation Services – Abbreviations and Codes
(ICAO Doc 8400)
PANS-AERO Procedures for Air Navigation Services – Aerodromes (ICAO Doc 9981)
PANS-ATM Procedures for Air Navigation Services – Air Traffic Management(ICAO Doc 4444)
PANS-RAC Procedures for Air Navigation Services – RAC (now PANS-ATM)
PANS-OPS Procedures for Air Navigation Services – Aircraft Operations
(ICAO Doc 8168)
PANS-TRG Procedures for Air Navigation Services – Training (ICAO Doc 9868)
PBN Performance Based Navigation
PC Provisional Council
PCA Prior Co-ordination Airspace
PCFL Pre-cleared Flight Level
PCM Pulse Code Modulation
P-Code Precision Code
PCX President and Chief Executive Officer
PDC Pre-Departure Clearance
PDOP Position Dilution of Precision
PEDI Planning, Education, Demonstration, and Implementation
PER Packed Encoding Rules
PET Pacific Engineering Trials
PF Position Fix Error
PFE Path Following Error
PFL Planned Flight Level
PHARE Programme for Harmonised ATM Research in EUROCONTROL
PI Performance Indicators
PIAC Peak Instantaneous Aircraft Count
PM Policy Material
POWG Permanent Office Working Group
PPL Private Pilot Licence
PPM Provisional Policy Material
PPS Precise Positioning Service
PRB Performance Review Board
PRC Performance Review Commission
PRN Pseudorandom Number
PRU Performance Review Units (EUROCONTROL)
PSR Primary Surveillance Radar
PSTN Public Switched Telecommunications Network
PTLP ICAO Personnel Training and Licensing Panel
PWP Pilot Working Position


QFE Atmospheric Pressure at Aerodrome Elevations or at Runway Threshold
QMS Quality management systems
QNH Altimeter Sub-scale Setting to obtain Elevation when of the Ground
QOS Quality-Of-Service


R&D Research and Development
R/T a) Radio Transmissionb) Radio Telephony
RA Resolution Advisory
RAD Material relating to the provision of radar services
RAN Regional Air Navigation (Meeting)
RCA Reduced Co-ordination Airspace
RCF Radio Communication Failure
RCMS Route Conformance Monitoring System
RDA Route Deviation Alert
RDARA Regional and Domestic Air Route Area.
RDE-FG Radar Data Exchange – Focus Group
RDF Radar Data Function
RDP Radar Data Processing
RDPC Radar Data Processing Chain
RDPS Radar Data Processing System
RDT&D Research, Development, Trials and Demonstrations
RE Reserved Expansion Indicator
RECAT Recategorization (of aircraft for wake turbulence)
REM Rapid Eye Movement
REP Field Repetition Indicator
RF Radius to Fix (method of turn)
RFG Requirements Focus Group
RFI Radio Frequency Interference
RFP Request for Proposal
RGS Remote Ground Station
RHCP Right-Hand-Circular Polarised
RLAT Reduced Lateral Separation Minima
RLONG Reduced Longitudinal Separation Minima
RMM Remote Maintenance Monitoring
RNAV Area Navigation
RNAV Route Area Navigation Route
RNP Required Navigation Performance
RNP GM Guidance Material for Required Navigation Performance
RPA Remotely Piloted Aircraft
RPAS Remotely Piloted Aircraft System
RPASP ICAO Remotely Piloted Aircraft Systems Panel
RPL Repetitive Flight-Plan
RPV Remotely Piloted Vehicle
RRC Range Rate Correction
RSP Required Surveillance Performance
RSS Root-sum-square
RTA Required Time of Arrival
RTCA Radio Technical Commission for Aeronautics
RTCM Radio Technical Commission for Maritime
RTF Radiotelephony
RTS Real-time Simulation
RVSM Reduced Vertical Separation Minima
RWEWP Runway End Waypoint
RWIWP Runway Intercept Waypoint
RWY Runway
RWSL Runway Status Lights


s second, unit of time
SA a) Selective Availability
b) Situational Awareness
SAC System Area Code
SAE Society of Automotive Engineers
SAGE The Safety Awareness Group at the EEC
SAM a) Safety Assessment Methodologyb) South America
SAR Search and Rescue
SARPs Standards and Recommended Practices (ICAO)
SAS Safety, Analysis, and Scientific (an EEC Centre of Expertise)
SASP ICAO Separation and Airspace Safety Panel
SATCOM Satellite Communication(s)
SBC Sub-Band Coding
SBU Separate Business Units
SC a) Special Committeeb) Standing Committee
SCIA Simultaneous Converging Instrument Approaches
SDM Sum Depth of Modulation (ILS)
SDPS Surveillance Data Processing System
SEE Society, Environment, Economics (an EEC Research Area)
SELCAL Selective Call
SEP Policy on Separation Standards
SES Single European Sky
SESAR Single European Sky ATM Research
SFM Simulation Facility Management (an EEC Centre of Expertise)
SG Study Group
SIC System Identification Code
SID Standard Instrument Departure
SIGMET Significant Meteorological Information
SIMOPS Simulation Operations
SIRO Simultaneous Intersecting Runway Operations
SITA Société Internationale de Télécommunications Aéronautiques
SITF Study and Implementation Task Force
SLM Standard Length Message
SLOP Standard Lateral Offset Procedures
SM Scale Marker
SMC System Management and Communication
SMF Separation Monitoring Function
SMGCS Surface Movement Guidance and Control System
SMP ICAO Safety Management Panel
SMR Surface Movement Radar
SMS a) Safety Management Systemb) Surface Movement System
SOIT FAA Satellite Operations Implementation Team
SP a) Special Purpose Indicatorb) ICAO Surveillance Panel
SPF Strategic Performance Framework
SPI Special Position Identification
SPO Single Person Operations
SPR Safety and Performance Requirement
SPS Standard Positioning Service
SPT Strip Printer
SRA Strategic Research Agenda
SRC EUROCONTROL Safety Regulation Commission
SRDP Safety Research and Development Plan
SRE Slant Range Error
SSC Significant Safety Concern (ICAO USOAP CMA)
SSP Sector Safety and Productivity (an EEC Research Area)
SSR Secondary Surveillance Radar
SSRP Strategic Safety Research Plan
SSWG System Support Working Group
STAR a) Standard Instrument Arrival (Route)
b) Standard Arrival Route
STC Supplementary Type Certification
STCA Short Term Conflict Alert
SUR-T Surveillance Team (EATM)
SVC System View Cell
S-VFR Special-VFR
SWIM System-Wide Information Management


TA mode Traffic Advisory mode
TACAN Tactical Air Navigation
TAG Tactical Action Group
TAS True Airspeed
TAWS Terrain Awareness and Warning System
TBA To be Announced
TCAS a) Traffic Collision Avoidance System
b) Traffic Alert and Collision Avoidance System
TCH Threshold Crossing Height
TCP Transport Control Protocol
TCP/IP Transmission Control Protocol/Internetwork Protocol
TCWP Threshold Crossing Waypoint
TDLS Tower Data Link System
TDM Track Definition Message
TDWR Terminal Doppler Weather Radar
TEM Threat and Error Management
TIBA Traffic Information Broadcast (by aircraft)
TIS Traffic Information Service
TIS-B Traffic Information Service Broadcast
TL Transition Level
TLS Target Level of Safety
TMA a) Terminal Control Area
b) Terminal Manoeuvring Area
TNAV Time Navigation
TOBT Target Off Block Time
TP Turn Point
TP4 Transport Protocol Class 4
TPC Technical Policy Coordinator
TPDU Transport Protocol Data Unit
TPM IFATCA Technical and Professional Manual
TPSec IFATCA Technical and Professional Secretary
TQM Total Quality Management
TRA Temporary Reserved Area
TRM Team Resource Management
TRS Transmission message
TSA Temporary Segregated Area
TSAP-ID Transport Service Access Point Identifier
TSE Total System Error Generic
TSO Technical Standard Order
TWDL Two-Way Data Link Communication
TWIP Terminal Weather Information for Pilots
TWP Technical Work Programme of the Organisation in the Air Navigation Field
TWPC Two-Way Pilot Controller
TWR Aerodrome Control Tower


UA Unmanned Aircraft
UAC Upper Area Control Centre
UAP a) Upper Airspace Project
b) User Application Profile
UAS Unmanned Aircraft Systems
UASAG ICAO Unmanned Aerial Systems Advisory Group
UAT Universal Access Transmitter
UAV a) Uniform Annual Values
b) Unmanned Aerial Vehicle
UCAR Unmanned Combat Armed Rotorcraft
UCAV Unmanned Combat Aerial Vehicle
UDPP User Driven Prioritization Process
UDRE User Differential Range Error
UN United Nations
UNDP United Nations Development Programme
URA User Range Accuracy
UTC Co-ordinated Universal Time
UUP Updated Airspace Use Plan


VDEV Vertical Deviation
VDL VHF Data Link
VDOP Vertical Dilution of Precision
VDR a) VHF Data Radio
b) Validation Data Repository
VDT Video Display Terminal
VDU Visual Display Unit
VFR Visual Flight Rules
VGH Validation Guideline Handbook
VHF Very High Frequency
VMC Visual Meteorological Conditions
VNAV Vertical Navigation
VOR VHF Omnidirectional Radio Range
VP Vertical Profile
VPAE Vertical Profile Angle Error
VPF Vertical Position Fix Error
VPIP Vertical Profile Intercept Point
VSM Vertical Separation Minimum
VSWR Voltage Standing Wave Ratio


W/E Warning/Error Condition
W/P, WP Waypoint
WA Wind Angle
WADGNSS Wide Area Differential GNSS
WAN Wide Area Network
WCM World Class Manufacturers
WG Working Group
WGS World Geodetic Survey
WGS-84 World Geodetic System 84
WHO World Health Organisation
WIP Working Group for Runway Incursion Prevention
WP Working Paper
WS Wind Speed


XTK Cross-Track Distance


Last Update: July 31, 2022  

November 3, 2019   1234   Jean-Francois Lepage    TPM  

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