Airport Acronyms and Abbreviations

The following acronyms appear in FAA airport standards and related publications.

Airport Codes/Airport Identifiers: To find identifiers, visit FAA's Location Identifiers Search Tool.

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


AAM — Advanced Air Mobility

A/C — Aircraft

A/G — Air to Ground

A/H — Altitude/Height

AAC — Mike Monroney Aeronautical Center

AAF — Army Air Field

AAI — Arrival Aircraft Interval

AAM — Advanced Air Mobility

AAP — Advanced Automation Program

AAR — Airport Acceptance Rate

ABDIS — Automated Data Interchange System Service B

AC — Advisory Circular

AC — Alternating Current

ACAIS — Air Carrier Activity Information System

ACAS — Aircraft Collision Avoidance System

ACC — Airports Consultants Council

ACC — Area Control Center

ACCT — Accounting Records

ACD — Automatic Call Distributor

ACDO — Air Carrier District Office

ACF — Area Control Facility

ACFO — Aircraft Certification Field Office

ACFT — Aircraft

ACI-NA — Airports Council International - North America

ACID — Aircraft Identification

ACIP — Airport Capital Improvement Plan

ACLS — Automatic Carrier Landing System

ACLT — Actual Landing Time Calculated

ACM — Airport Certification Manual

ACO — Office of Airports Compliance and Field Operations

ACO — Aircraft Certification Office

ACRP — Airport Cooperative Research Program

ADA — Air Defense Area

ADAP — Airport Development Aid Program

ADAS — AWOS Data Acquisition System

ADCCP — Advanced Data Communications Control Procedure

ADDA — Administrative Data

ADF — Automatic Direction Finding

ADG — Airplane Design Group

ADI — Automatic De-Ice and Inhibitor


ADIP — Airport Data and Information Portal

ADIZ — Air Defense Identification Zone

ADL — Aeronautical Data-Link

ADLY — Arrival Delay

ADO — Airline Dispatch Office

ADP — Automated Data Processing

ADS — Automatic Dependent Surveillance

ADS-B — Automatic Dependent Surveillance-Broadcast

ADSIM — Airfield Delay Simulation Model

ADSY — Administrative Equipment Systems

ADTN — Administrative Data Transmission Network

ADTN2000 — Administrative Data Transmission Network 2000

ADVO — Administrative Voice

AED — Aircraft Evaluation Division

AERA — Automated En-Route Air Traffic Control

AEX — Automated Execution

AF — Airway Facilities

AFB — Air Force Base

AFIS — Automated Flight Inspection System

AFP — Area Flight Plan

AFRES — Air Force Reserve Station

AFS — Airways Facilities Sector

AFSFO — AFS Field Office

AFSFU — AFS Field Unit

AFSOU — AFS Field Office Unit (Standard is AFSFOU)

AFSS — Automated Flight Service Station

AFTN — Automated Fixed Telecommunications Network

AGIS — Airports Geographic Information System (Replaced byt ADIP)

AGL — Above Ground Level

AID — Airport Information Desk

AIG — Airbus Industries Group

AIM — Airman's Information Manual

AIP — Airport Improvement Plan

AIRMET — Airmen's Meteorological Information

AIRNET — Airport Network Simulation Model

AIS — Aeronautical Information Service

AIT — Automated Information Transfer

ALP — Airport Layout Plan

ALS — Approach Lighting System

ALSF1 — ALS with Sequenced Flashers I

ALSF2 — ALS with Sequenced Flashers II

ALSIP — Approach Lighting System Improvement Plan

ALTRV — Altitude Reservation

AMASS — Airport Movement Area Safety System

AMCC — ACF/ARTCC Maintenance Control Center

AMOS — Automated Meteorological Observation Station

AMP — ARINC Message Processor (OR) Airport Master Plan

AMVER — Automated Mutual Assistance Vessel Rescue System

ANC — Alternate Network Connectivity

ANCA — Airport Noise and Capacity Act

ANG — Air National Guard

ANGB — Air National Guard Base

ANMS — Automated Network Monitoring System

ANSI — American National Standards Group

AOA — Air Operations Area

AP — Acquisition Plan

APP — Approach

APS — Airport Planning Standard

AQAFO — Aeronautical Quality Assurance Field Office

ARAC — Army Radar Approach Control (AAF)

ARAC — Aviation Rulemaking Advisory Committee

ARC — Airport Reference Code

ARCTR — FAA Aeronautical Center or Academy

ARF — Airport Reservation Function

ARFF — Aircraft Rescue and Fire Fighting

ARINC — Aeronautical Radio, Inc.

ARLNO — Airline Office

ARO — Airport Reservation Office

ARP — Airport Reference Point

ARP — Aerospace Recommended Practice

ARRA — American Recovery and Reinvestment Act of 2009

ARSA — Airport Service Radar Area

ARSR — Air Route Surveillance Radar

ARTCC — Air Route Traffic Control Center

ARTS — Automated Radar Terminal System

ASAS — Aviation Safety Analysis System

ASC — AUTODIN Switching Center

ASCP — Aviation System Capacity Plan

ASD — Aircraft Situation Display

ASDA — Accelerate — Stop Distance Available

ASLAR — Aircraft Surge Launch And Recovery

ASM — Available Seat Mile

ASP — Arrival Sequencing Program

ASOS — Automatic Surface Observation System

ASQP — Airline Service Quality Performance

ASR — Airport Surveillance Radar

ASTA — Airport Surface Traffic Automation

ASV — Annual Service Volume

ASV — Airline Schedule Vendor

AT — Air Traffic

ATA — Air Transport Association of America

ATAS — Airspace and Traffic Advisory Service

ATCAA — Air Traffic Control Assigned Airspace

ATC — Air Traffic Control

ATCBI — Air Traffic Control Beacon Indicator

ATCCC — Air Traffic Control Command Center

ATCO — Air Taxi Commercial Operator

ATCRB — Air Traffic Control Radar Beacon

ATCRBS — Air Traffic Control Radar Beacon System

ATCSCC — Air Traffic Control Systems Command Center

ATCT — Airport Traffic Control Tower

ATIS — Automated Terminal Information Service

ATISR — ATIS Recorder

ATM — Air Traffic Management

ATM — Asynchronous Transfer Mode

ATMS — Advanced Traffic Management System

ATN — Aeronautical Telecommunications Network


ATOVN — AUOTVON (Facility)

ATOMS — Air Traffic Operations Management System

ATS — Air Traffic Service

ATSCCP — ATS Contingency Command Post

AUTODIN — DoD Automatic Digital Network

AUTOVON — DoD Automatic Voice Network


AVN — Aviation Standards National Field Office, Oklahoma City

AWIS — Airport Weather Information

AWOS — Automated Weather Observation System

AWP — Aviation Weather Processor

AWPG — Aviation Weather Products Generator

AWS — Air Weather Station



BANS — BRITE Alphanumeric System

BART — Billing Analysis Reporting Tool (GSA software tool)

BASIC — Basic Contract Observing Station

BASOP — Military Base Operations

BCA — Benefit/Cost Analysis

BCR — Benefit/Cost Ratio

BDAT — Digitized Beacon Data

BMP — Best Management Practices

BOC — Bell Operating Company

bps — bits per second

BRI — Basic Rate Interface

BRITE — Bright Radar Indicator Terminal Equipment

BRL — Building Restriction Line

BUEC — Back-- up Emergency Communications

BUECE — Back-- up Emergency Communications Equipment



CAA — Civil Aviation Authority

CAA — Clean Air Act

CAB — Civil Aeronautics Board

CAC — Citizen's Advisory Committee

CAD — Computer Aided Design

CARES — Coronavirus Aid, Relief, and Economic Security (CARES) Act

CARF — Central Altitude Reservation Facility

CASFO — Civil Aviation Security Office

CAT — Category

CAT — Clear — Air Turbulence

CATS — Certification Activity Tracking System

CAU — Crypto Ancillary Unit

CBI — Computer Based Instruction

CCC — Communications Command Center

CCCC — Staff Communications

CCCH — Central Computer Complex Host

CC&O — Customer Cost and Obligation

CCS — Combined Charging Standard

CCSD — Command Communications Service Designator

CCS7 -- NI — Communication Channel Signal-7 — Network Interconnect

CCU — Central Control Unit

CD — Common Digitizer

CDR — Cost Detail Report

CDT — Controlled Departure Time

CDTI — Cockpit Display of Traffic Information

CENTX — Central Telephone Exchange

CEP — Capacity Enhancement Program

CEQ — Council on Environmental Quality

CERAP — Center Radar Approach Control

CERAP — Central Radar Approach

CERAP — Combined Center/Radar Approach Control

CFC — Central Flow Control

CFCF — Central Flow Control Facility

CFCS — Central Flow Control Service

CFR — Code of Federal Regulations

CFWP — Central Flow Weather Processor

CFWU — Central Flow Weather Unit

CGAS — Coast Guard Air Station

CIP — Capital Improvement Plan

CLC — Course Line Computer

CLIN — Contract Line Item

CLT — Calculated Landing Time

CM — Commercial Service Airport

CNMPS — Canadian Minimum Navigation Performance Specification Airspace

CNS — Consolidated NOTAM System

CNSP — Consolidated NOTAM System Processor

CO — Central Office

COE — U.S. Army Corps of Engineers

COMCO — Command Communications Outlet

CONUS — Continental United States

CORP — Private Corporation other than ARINC or MITRE

CPE — Customer Premise Equipment

CPMIS — Consolidated Personnel Management Information System

CRA — Conflict Resolution Advisory

CRDA — Converging Runway Display Aid

CRT — Cathode Ray Tube

CS/PP — Construction Safety and Phasing Plan

CSA — Communications Service Authorization

CSIS — Centralized Storm Information System

CSO — Customer Service Office

CSR — Communications Service Request

CSS — Central Site System

C/S/S/N — Capacity/Safety/Security/Noise

CTA — Controlled Time of Arrival

CTA — Control Area

CTA/FIR — Control Area/Flight Information Region

CTAF — Common Traffic Advisory Frequency

CTAS — Center — Tracon Automation System

CTMA — Center Traffic Management Advisor

CUPS — Consolidated Uniform Payroll System

CVFR — Controlled Visual Flight Rules

CVTS — Compressed Video Transmission Service

CWA — Clean Water Act

CW — Continuous Wave

CWSU — Central Weather Service Unit

CWY — Clearway



D — Controlling Dimension

DA — Direct Access

DA — Decision Altitude/Decision Height

DA — Descent Advisor

DABBS — DITCO Automated Bulletin Board System

DAIR — Direct Altitude and Identity Readout

DAR — Designated Agency Representative

DARC — Direct Access Radar Channel

dBA — Decibels A-weighted

DBCRC — Defense Base Closure and Realignment Commission

DBE — Disadvantaged Business Enterprise

DBMS — Data Base Management System

DBRITE — Digital Bright Radar Indicator Tower Equipment

DC — Direct Current

DCA — Defense Communications Agency

DCAA — Dual Call, Automatic Answer Device

DCCU — Data Communications Control Unit

DCE — Data Communications Equipment

DDA — Dedicated Digital Access

DDD — Direct Distance Dialing

DDM — Difference in Depth of Modulation

DDS — Digital Data Service

DEA — Drug Enforcement Agency

DEDS — Data Entry and Display System

DEIS — Draft Environmental Impact Statement

DEP — Departure

DEWIZ — Distance Early Warning Identification Zone

DF — Direction Finder

DFAX — Digital Facsimile

DFI — Direction Finding Indicator

DGPS — Differential Global Positioning Satellite (System)

DH — Decision Height

DID — Direct Inward Dial

DIP — Drop and Insert Point

DIRF — Direction Finding

DITCO — Defense Information Technology Contracting Office Agency

DME — Distance Measuring Equipment

DME/P — Precision Distance Measuring Equipment

DMN — Data Multiplexing Network

DNL — Day-- Night Equivalent Sound Level (Also called Ldn)

DOD — Direct Outward Dial

DoD — Department of Defense

DOI — Department of Interior

DOS — Department of State

DOT — Department of Transportation

DOTS — Dynamic Ocean Tracking System

DOTCC — Department of Transportation Computer Center

DSCS — Digital Satellite Compression Service

DSUA — Dynamic Special Use Airspace

DTS — Dedicated Transmission Service

DUAT — Direct User Access Terminal

DVFR — Defense Visual Flight Rules

DVFR — Day Visual Flight Rules

DVOR — Doppler Very High Frequency Omni-- Directional Range

DYSIM — Dynamic Simulator



E-MSAW — En-Route Automated Minimum Safe Altitude Warning

EA — Environmental Assessment

EARTS — En Route Automated Radar Tracking System

EB — Engineering Brief

ECOM — En Route Communications

ECVFP — Expanded Charted Visual Flight Procedures

EDCT — Expedite Departure Path

EFAS — En Route Flight Advisory Service

EFC — Expect Further Clearance

EFIS — Electronic Flight Information Systems

EIAF — Expanded Inward Access Features

EIS — Environmental Impact Statement

ELT — Emergency Locator Transmitter

ELWRT — Electrowriter

EMAS — Engineered Materials Arresting System

EMPS — En Route Maintenance Processor System

EMS — Environmental Management System

ENAV — En Route Navigational Aids

EPA — Environmental Protection Agency

EPS — Engineered Performance Standards

EOF — Emergency Operating Facility

EPSS — Enhanced Packet Switched Service

ERAD — En Route Broadband Radar

ESEC — En Route Broadband Secondary Radar

ESP — En Route Spacing Program

ESS — Energy Storage System

ESYS — En Route Equipment Systems

ESF — Extended Superframe Format

ETA — Estimated Time of Arrival

ETE — Estimated Time En Route

ETG — Enhanced Target Generator

ETL — Effective Translational Lift

ETMS — Enhanced Traffic Management System

ETN — Electronic Telecommunications Network

EV — Electric Vehicle

EVAS — Enhanced Vortex Advisory System

EVCS — Emergency Voice Communications System

eVTOL — Electric Vertical Takeoff and Landing



FAA — Federal Aviation Administration

F&E — Facilities and Equipment

FAAAC — FAA Aeronautical Center

FAACIS — FAA Communications Information System

FAATC — FAA Technical Center

FAATSAT — FAA Telecommunications Satellite

FAC — Facility

FAF — Final Approach Fix

FAP — Final Approach Point

FAPM — FTS2000 Associate Program Manager

FAR — Federal Aviation Regulation

FAST — Final Approach Spacing Tool

FATO — Final Approach and Take Off Area

FAX — Facsimile Equipment

FBO — Fixed Base Operator

FBS — Fall Back Switch

FC — Failure Condition

FCC — Federal Communications Commission

FCLT — Freeze Calculated Landing Time

FCOM — FSS Radio Voice Communications

FCPU — Facility Central Processing Unit

FDAT — Flight Data Entry and Printout (FDEP) and Flight Data Service

FDE — Flight Data Entry

FDEP — Flight Data Entry and Printout

FDIO — Flight Data Input/Output

FDIOC — Flight Data Input/Output Center

FDIOR — Flight Data Input/Output Remote

FDM — Frequency Division Multiplexing

FDP — Flight Data Processing

FED — Federal

FEIS — Final Environmental Impact Statement

FEP — Front End Processor

FFAC — From Facility

FIFO — Flight Inspection Field Office

FIG — Flight Inspection Group

FINO — Flight Inspection National Field Office

FIPS — Federal Information Publication Standard

FIR — Flight Information Region

FIRE — Fire Station

FIRMR — Federal Information Resource Management Regulation

FL — Flight Level

FLOWSIM — Traffic Flow Planning Simulation

FMA — Final Monitor Aid

FMF — Facility Master File

FMIS — FTS2000 Management Information System

FMS — Flight management System

FNMS — FTS2000 Network Management System

FOD — Foreign Object Debris or Foreign Object Damage

FOIA — Freedom Of Information Act

FONSI — Finding of No Significant Impact

FP — Flight Plan

FRC — Request Full Route Clearance

FSAS — Flight Service Automation System

FSDO — Flight Standards District Office

FSDPS — Flight Service Data Processing System

FSEP — Facility/Service/Equipment Profile

FSP — Flight Strip Printer

FSPD — Freeze Speed Parameter

FSS — Flight Service Station

FSSA — Flight Service Station Automated Service

FSTS — Federal Secure Telephone Service

FSYS — Flight Service Station Equipment Systems

FTS — Federal Telecommunications System

FTS2000 — Federal Telecommunications System 2000

FUS — Functional Units or Systems

FWCS — Flight Watch Control Station



GA — General Aviation

GAA — General Aviation Activity

GAAA — General Aviation Activity and Avionics

GADO — General Aviation District Office

GCA — Ground Control Approach

GIS — Geographic Information System

GNAS — General National Airspace System

GNSS — Global Navigation Satellite System

GOES — Geostationary Operational Environmental Satellite

GOESF — GOES Feed Point

GOEST — GOES Terminal Equipment

GPRA — Government Performance Results Act

GPS — Global Positioning System

GPWS — Ground Proximity Warning System

GRADE — Graphical Airspace Design Environment

GS — Glide Slope Indicator

GSA — General Services Administration

GSE — Ground Support Equipment



H — Non-- Directional Radio Homing Beacon (NDB)

HAA — Height Above Airport

HAL — Height Above Landing

HARS — High Altitude Route System

HAT — Height Above Touchdown

HAZMAT — Hazardous Material

HCAP — High Capacity Carriers

HLDC — High Level Data Link Control

HDME — NDB with Distance Measuring Equipment

HDQ — FAA Headquarters

HELI — Heliport

HF — High Frequency

HH — NDB, 2kw or More

HI-- EFAS — High Altitude EFAS

HOGE — Hover Out of Ground Effect

HOV — High Occupancy Vehicle

HPZ — Heliport Protection Zone

HSI — Horizontal Situation Indicators

HUD — Housing and Urban Development

HWAS — Hazardous In-- Flight Weather Advisory




IA — Indirect Access

IAF — Initial Approach Fix

I/AFSS — International AFSS

IAP — Instrument Approach Procedures

IAPA — Instrument Approach Procedures Automation

IBM — International Business Machines

IBP — International Boundary Point

IBR — Intermediate Bit Rate

ICAO — International Civil Aviation Organization

ICSS — International Communications Switching Systems

IDAT — Interfacility Data

IEC — International Electrotechnical Commission

IEEE — Institute of Electrical and Electronics Engeneers

IF — Intermediate Fix

IFC — International Fire Code

IFCP — Interfacility Communications Processor

IFDS — Interfacility Data System

IFEA — In-- Flight Emergency Assistance

IFO — International Field Office

IFR — Instrument Flight Rules

IFSS — International Flight Service Station

ILS — Instrument Landing System

IM — Inner Marker

IMC — Instrument Meteorological Conditions

INM — Integrated Noise Model

INS — Inertial Navigation System

IRMP — Information Resources Management Plan

ISDN — Integrated Services Digital Network

ISMLS — Interim Standard Microwave Landing System

ISO — International Organization for Standardization

ITI — Interactive Terminal Interface

IVRS — Interim Voice Response System

IW — Inside Wiring






Kbps — Kilobits Per Second

Khz — Kilohertz

KVDT — Keyboard Video Display Terminal



LAA — Local Airport Advisory

LAAS — Low Altitude Alert System

LABS — Leased A B Service

LABSC — LABS GS-- 200 Computer

LABSR — LABS Remote Equipment

LABSW — LABS Switch System

LAHSO — Land and Hold Short Operation

LAN — Local Area Network

LAP — Landing Area Proposal

LATA — Local Access and Transport Area

LAWRS — Limited Aviation Weather Reporting System

LBA — Load-Bearing Area

LCF — Local Control Facility

LCN — Local Communications Network

LDA — Localizer Directional Aid

LDA — Landing Directional Aid

LDIN — Lead-- in Lights

LDR — Landing Distance Required

LEC — Local Exchange Carrier

LED — Light Emitting Diode

LF — Low Frequency

LINCS — Leased Interfacility NAS Communications System

LIS — Logistics and Inventory System

LLWAS — Low Level Wind Shear Alert System

LM/MS — Low/Medium Frequency

LMM — Locator Middle Marker

LMS — LORAN Monitor Site

LOB — Line of Business

LOC — Localizer

LOCID — Location Identifier

LOI — Letter of Intent

LOM — Compass Locator at Outer Marker

LORAN — Long Range Aid to Navigation

LPV — Lateral Precision Performance with Vertical Guidance

LRCO — Limited Remote Communications Outlet

LRNAV — Long Range Navigation

LRR — Long Range Radar



MAA — Maximum Authorized Altitude

MALS — Medium Intensity Approach Lighting System

MALSF — MALS with Sequenced Flashers

MALSR — MALS with Runway Alignment Indicator Lights

MAP — Maintenance Automation Program

MAP — Military Airport Program

MAP — Missed Approach Point

MAP — Modified Access Pricing

Mbps — Megabits Per Second

MCA — Minimum Crossing Altitude

MCAS — Marine Corps Air Station

MCC — Maintenance Control Center

MCL — Middle Compass Locater

MCS — Maintenance and Control System

MCS — Megawatt Charging System

MDA — Minimum Descent Altitude

MDT — Maintenance Data Terminal

MEA — Minimum En Route Altitude

METI — Meteorological Information

MF — Middle Frequency

MFJ — Modified Final Judgment

MFT — Meter Fix Crossing Time/Slot Time

MHA — Minimum Holding Altitude

Mhg — MegHERTZ

MIA — Minimum IFR Altitudes

MIDO — Manufacturing Inspection District Office

MIS — Meteorological Impact Statement

MISC — Miscellaneous

MISO — Manufacturing Inspection Satellite Office

MIT — Miles In Trail

MITRE — Mitre Corporation

MLS — Microwave Landing System

MM — Middle Marker

MMC — Maintenance Monitoring Console

MMS — Maintenance Monitoring System

MNPS — Minimum Navigation Performance Specification

MNPSA — Minimum Navigation Performance Specifications Airspace

MOA — Memorandum of Agreement

MOA — Military Operations Area

MOCA — Minimum Obstruction Clearance Altitude

MODE C — Altitude-- Encoded Beacon Reply

MODE C — Altitude Reporting Mode of Secondary Radar

MODE S — Mode Select Beacon System

MOU — Memorandum of Understanding

MPO — Metropolitan Planning Organization

MPS — Maintenance Processor Subsystem (OR) Master Plan Supplement

MRA — Minimum Reception Altitude

MRC — Monthly Recurring Charge

MSA — Minimum Safe Altitude

MSAW — Minimum Safe Altitude Warning

MSL — Mean Sea Level

MSN — Message Switching Network

MTCS — Modular Terminal Communications System

MTI — Moving Target Indicator

MTOW — Maximum Takefoff Weight

MUX — Multiplexor

MVA — Minimum Vectoring Altitude

MVFR — Marginal Visual Flight Rules



NAAQS — National Ambient Air Quality Standards

NADA — NADIN Concentrator

NADIN — National Airspace Data Interchange Network

NADSW — NADIN Switches

NAILS — National Airspace Integrated Logistics Support


NAPRS — National Airspace Performance Reporting System

NAS — National Airspace System or Naval Air Station

NASDC — National Aviation Safety Data

NASP — National Airspace System Plan

NASPAC — National Airspace System Performance Analysis Capability

NATCO — National Communications Switching Center

NAVAID — Navigational Aid

NAVMN — Navigation Monitor and Control

NAWAU — National Aviation Weather Advisory Unit

NAWPF — National Aviation Weather Processing Facility

NCAR — National Center for Atmospheric Research; Boulder, CO

NCF — National Control Facility

NCIU — NEXRAD Communications Interface Unit

NCP — Noise Compatibility Program

NCS — National Communications System

NDB — Non-- Directional Radio Homing Beacon


NEC — National Electric Code

NEM — Noise Exposure Map

NEMSPA — National EMS Pilots Association

NEPA — National Environmental Policy Act

NEXRAD — Next Generation Weather Radar

NFAX — National Facsimile Service

NFDC — National Flight Data Center

NFIS — NAS Facilities Information System

NFPA — National Fire Protection Association

NI — Network Interface

NICS — National Interfacility Communications System

NM — Nautical Mile

NMAC — Near Mid Air Collision

NMC — National Meteorological Center

NMCE — Network Monitoring and Control Equipment

NMCS — Network Monitoring and Control System

NOAA — National Oceanic and Atmospheric Administration

NOC — Notice Of Completion

NOTAM — Notice to Air Missions

NPDES — National Pollutant Discharge Elimination System

NPE — Non-primary Airport Entitlement

NPIAS — National Plan of Integrated Airport Systems

NPRM — Notice of Proposed Rulemaking

NR — Non-Rulemaking; refers to a type of airport airspace analysis case

NRA — Non-Rulemaking Airport; refers to a type of airport airspace analysis case

NRC — Non-- Recurring Charge

NRCS — National Radio Communications Systems

NSAP — National Service Assurance Plan

NSRCATN — National Strategy to Reduce Congestion on America's Transportation Network

NSSFC — National Severe Storms Forecast Center

NSSL — National Severe Storms Laboratory; Norman, OK

NTAP — Notices To Airmen Publication

NTP — National Transportation Policy

NTSB — National Transportation Safety Board

NTZ — No Transgression Zone

NWS — National Weather Service

NWSR — NWS Weather Excluding NXRD

NSWRH — NWS Regional Headquarters

NXRD — Advanced Weather Radar System



OAG — Official Airline Guide

OALT — Operational Acceptable Level of Traffic

OAW — Off-- airway Weather Station

ODAL — Omnidirectional Approach Lighting System

ODAPS — Oceanic Display and Processing Station

OEI — One Engine Inoperative

OEM — Original Equipment Manufacturer

OEP — Operational Evolution Plan / Partnership

OFA — Object Free Area

OFDPS — Offshore Flight Data Processing System

OFT — Outer Fix Time

OFZ — Obstacle Free Zone

OM — Outer Marker

OMB — Office of Management and Budget

ONER — Oceanic Navigational Error Report

OPLT — Operational Acceptable Level of Traffic

OPSW — Operational Switch

OPX — Off Premises Exchange

ORD — Operational Readiness Demonstration

OTR — Oceanic Transition Route

OTS — Organized Track System



PABX — Private Automated Branch Exchange

PAD — Packet Assembler/Disassembler

PAL — Planning Activity Level

PAM — Peripheral Adapter Module

PAPI — Precision Approach Path Indicator

PAR — Precision Approach Radar

PAR — Preferential Arrival Route

PATWAS — Pilots Automatic Telephone Weather Answering Service

PBB — Passenger Boarding Bridge

PBCT — Proposed Boundary Crossing Time

PBRF — Pilot Briefing

PBX — Private Branch Exchange

PCA — Positive Control Airspace

PCC — Portland Cement Concrete

PCM — Pulse Code Modulation

PDAR — Preferential Arrival And Departure Route

PDC — Pre-Departure Clearance

PDC — Program Designator Code

PDR — Preferential Departure Route

PDN — Public Data Network

PFC — Passenger Facility Charge

PGP — Planning Grant Program

PIC — Principal Interexchange Carrier

PIDP — Programmable Indicator Data Processor

PIM — Preformed Thermoplastic Markings

PIREP — Pilot Weather Report

PMS — Program Management System

POLIC — Police Station

POP — Point Of Presence

POT — Point Of Termination

PPIMS — Personal Property Information Management System

PR — Primary Commercial Service Airport

PRI — Primary Rate Interface

PRM — Precision Runway Monitor

PSDN — Public Switched Data Network

PSN — Packet Switched Network

PSS — Packet Switched Service

PSTN — Public Switched Telephone Network

PTC — Presumed-to-Conform

PUB — Publication

PUP — Principal User Processor

PVC — Permanent Virtual Circuit

PVD — Plan View Display



QA — Quality Assurance



RA — Risk Assessment

RAIL — Runway Alignment Indicator Lights

RAPCO — Radar Approach Control (USAF)

RAPCON — Radar Approach Control (FAA)

RATCC — Radar Air Traffic Control Center

RATCF — Radar Air Traffic Control Facility (USN)

RBC — Rotating Beam Ceilometer

RBDPE — Radar Beacon Data Processing Equipment

RBSS — Radar Bomb Scoring Squadron

RCAG — Remote Communications Air/Ground

RCC — Rescue Coordination Center

RCF — Remote Communication Facility

RCCC — Regional Communications Control Centers

RCIU — Remote Control Interface Unit

RCL — Radio Communications Link

RCLR — RCL Repeater

RCLT — RCL Terminal

RCO — Remote Communications Outlet

RCU — Remote Control Unit

RDAT — Digitized Radar Data

RDP — Radar Data Processing

RDSIM — Runway Delay Simulation Model

REIL — Runway End Identification Lights

RF — Radio Frequency

RIWS — Runway Incursion Warning Systems

RL — General Aviation Reliever Airport

RMCC — Remote Monitor Control Center

RMCF — Remote Monitor Control Facility

RML — Radio Microwave Link

RMLR — RML Repeater

RMLT — RML Terminal

RMM — Remote Maintenance Monitoring

RMMS — Remote Maintenance Monitoring System

RMS — Remote Monitoring Subsystem

RMSC — Remote Monitoring Subsystem Concentrator

RNAV — Area Navigation

RNP — Required Navigation Performance

ROD — Record of Decision

ROSA — Report of Service Activity

ROT — Runway Occupancy Time

RP — Restoration Priority

RPC — Restoration Priority Code

RPG — Radar Processing Group

RPZ — Runway Protection Zone

RRH — Remote Reading Hygrothermometer

RRHS — Remote Reading Hydrometer

RRWDS — Remote Radar Weather Display

RRWSS — RWDS Sensor Site

RSA — Runway Safety Area

RSAT — Runway Safety Action Team

RSS — Remote Speaking System

RT — Remote Transmitter

RT & BTL — Radar Tracking And Beacon Tracking Level

RTAD — Remote Tower Alphanumerics Display

RTCA — Radio Technical Commission for Aeronautics

RTODR — Rejected Takeoff Distance Required

RTP — Regional Transportation Plan

RTR — Remote Transmitter/Receiver

RTRD — Remote Tower Radar Display

RTTF — Residential Through-the-Fence

RVR — Runway Visual Range

RW — Runway

RWDS — Same as RRWDS

RWP — Real-time Weather Processor



S/S — Sector Suite

SAC — Strategic Air Command

SAE — SAE International

SAFI — Semi Automatic Flight Inspection

SALS — Short Approach Lighting System

SAS — Safety Assessment Screening

SATCOM — Satellite Communications

SAWRS — Supplementary Aviation Weather Reporting System

SBGP — State Block Grant Program

SCC — System Command Center

SCVTS — Switched Compressed Video Telecommunications Service

SDF — Simplified Direction Finding

SDF — Software Defined Network

SDIS — Switched Digital Integrated Service

SDP — Service Delivery Point

SDS — Switched Data Service

SEL — Single Event Level

SELF — Simplified Short Approach Lighting System With Sequenced Flashing Lights

SFAR-- 38 — Special Federal Aviation Regulation 38

SHPO — State Historic Preservation Officer

SIC — Service Initiation Charge

SID — Station Identifier

SID — Standard Instrument Departure

SIGMET — Significant Meteorological Information

SIMMOD — Airport and Airspace Simulation Model

SIP — State Implementation Plan

SM — Statute Miles

SMGC — Surface Movement Guidance and Control

SMPS — Sector Maintenance Processor Subsystem

SMS — Safety Management System

SMS — Simulation Modeling System

SNR — Signal-- to-- Noise Ratio, also: S/N

SOC — Service Oversight Center

SOAR — System of Airports Reporting

SOIR — Simultaneous Operations On Intersecting Runways

SOIWR — Simultaneous Operations on Intersecting Wet Runways

SRA — Safety Risk Assessment

SRAP — Sensor Receiver and Processor

SRM — Safety Risk Management

SRMD — Safety Risk Management Document

SSALF — SSALS with Sequenced Flashers

SSALR — Simplified Short Approach Lighting System

SSB — Single Side Band

STAR — Standard Terminal Arrival Route

STD — Standard

STMUX — Statistical Data Multiplexer

STOL — Short Takeoff and Landing

SURPIC — Surface Picture

SVCA — Service A

SVCB — Service B

SVCC — Service C

SVCO — Service O

SVFO — Interphone Service F (A)

SVFB — Interphone Service F (B)

SVFC — Interphone Service F (C)

SVFD — Interphone Service F (D)

SVFR — Special Visual Flight Rules



T1MUX — T1 Multiplexer

TAAS — Terminal Advance Automation System

TAC — Technical Advisory Committee

TACAN — Tactical Aircraft Control and Navigation


TAF — Terminal Area Forecast, Terminal Aerodrome Forecast

TARS — Terminal Automated Radar Service

TAS — True Air Speed

TATCA — Terminal Air Traffic Control Automation

TAVT — Terminal Airspace Visualization Tool

TCA — Traffic Control Airport or Tower Control Airport

TCA — Terminal Control Area

TCACCIS — Transportation Coordinator Automated Command and Control Information System

TCAS — Traffic Alert And Collision Avoidance System

TCC — DOT Transportation Computer Center

TCCC — Tower Control Computer Complex

TCE — Tone Control Equipment

TCLT — Tentative Calculated Landing Time

TCO — Telecommunications Certification Officer

TCOM — Terminal Communications

TCS — Tower Communications System

TDLS — Tower Data-Link Services

TDMUX — Time Division Data Multiplexer

TDP — Takeoff Decision Point

TDPC — Touchdown/Positioning Circle

TDWR — Terminal Doppler Weather Radar

TELCO — Telephone Company

TELMS — Telecommunications Management System

TERPS — Terminal Instrument Procedures

TFAC — To Facility

TH — Threshold

TIMS — Telecommunications Information Management System

TIPS — Terminal Information Processing System

TL — Taxilane

TLOF — Touchdown and Liftoff Area

TMA — Traffic Management Advisor

TMC — Traffic Management Coordinator

TMC/MC — Traffic Management Coordinator/Military Coordinator

TMCC — Terminal Information Processing System

TMCC — Traffic Management Computer Complex

TMF — Traffic Management Facility

TML — Television Microwave Link

TMLI — Television Microwave Link Indicator

TMLR — Television Microwave Link Repeater

TMLT — Television Microwave Link Terminal

TM&O — Telecommunications Management and Operations

TMP — Traffic Management Processor

TMS — Traffic Management System

TMSPS — Traffic Management Specialists

TMU — Traffic Management Unit

TODA — Takeoff Distance Available

TODR — Takefoff Distance Required

TOF — Time Of Flight

TOFMS — Time of Flight Mass Spectrometer

TOPS — Telecommunications Ordering and Pricing System (GSA software tool)

TORA — Take-off Run Available

TNAV — Terminal Navigational Aids

TR — Telecommunications Request

TRACAB — Terminal Radar Approach Control in Tower Cab

TRACON — Terminal Radar Approach Control Facility

TRAD — Terminal Radar Service

TRB — Transportation Research Board

TRNG — Training

TSA — Taxiway Safety Area

TSA — Transportation Security Administration

TSEC — Terminal Secondary Radar Service

TSP — Telecommunications Service Priority

TSR — Telecommunications Service Request

TSYS — Terminal Equipment Systems

TTMA — TRACON Traffic Management Advisor

TTY — Teletype

TVOR — Terminal VHF Omnidirectional Range

TW — Taxiway

TWEB — Transcribed Weather Broadcast

TWR — Tower (non-controlled)

TY — Type (FAACIS)



UAM — Urban Air Mobility

UAS — Uniform Accounting System

UHF — Ultra High Frequency

UL — Underwriters Laboratories

URA — Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970

USAF — United States Air Force

USC — United States Code

USOC — Uniform Service Order Code



VALE — Voluntary Airport Low Emission

VASI — Visual Approach Slope Indicator

VDME — VOR with Distance Measuring Equipment

VF — Voice Frequency

VFR — Visual Flight Rules

VGSI — Visual Glideslope Indicator

VHF — Very High Frequency

VLF — Very Low Frequency

VMC — Visual Meteorological Conditions

VNAV — Visual Navigational Aids

VNTSC — Volpe National Transportation System Center

VON — Virtual On-net

VOR — VHF Omnidirectional Range

VOR/DME — VHF Omnidirectional Range/Distance Measuring Equipment

VORTAC — VOR collocated with TACAN

VOT — VOR Test Facility

VP/D — Vehicle/Pedestrian Deviation

VRS — Voice Recording System

VSCS — Voice Switching and Control System

VTA — Vertex Time of Arrival

VTAC — VOR collocated with TACAN

VTOL — Vertical Takeoff and Landing

VTS — Voice Telecommunications System



WAAS — Wide Area Augmentation System

WAN — Wide Area Network

WC — Work Center

WCP — Weather Communications Processor

WECO — Western Electric Company

WESCOM — Western Electric Satellite Communications

WHA — Wildlife Hazard Assessment

WHMP — Wildlife Hazard Management Plan

WMSC — Weather Message Switching Center

WMSCR — Weather Message Switching Center Replacement

WSCMO — Weather Service Contract Meteorological Observatory

WSFO — Weather Service Forecast Office

WSMO — Weather Service Meteorological Observatory

WSO — Weather Service Office

WTHR — "Weather"

WX — Weather









ZEV — Zero Emissions Vehicle


Last updated: Tuesday, January 24, 2023