FAR/AIM: Appendix 3. Abbreviations/Acronyms

Abbreviation/Acronym

Meaning

AAWU

Alaskan Aviation Weather Unit

AAS

Airport Advisory Service

AAM

Advanced Air Mobility

AC

Advisory Circular

ACAR

Aircraft Communications Addressing and Reporting System

ADCUS

Advise Customs

ADDS

Aviation Digital Data Service

ADF

Automatic Direction Finder

ADIZ

Air Defense Identification Zone

ADS-B

Automatic Dependent Surveillance-Broadcast

AFB

Air Force Base

AFCS

Automatic Flight Control System

AFIS

Automatic Flight Information Service

AFM

Aircraft Flight Manual

AGL

Above Ground Level

AHRS

Attitude Heading Reference System

AIM

Aeronautical Information Manual

AIRMET

Airmen's Meteorological Information

AIS

Aeronautical Information Services

ALD

Available Landing Distance

ALDARS

Automated Lightning Detection and Reporting System

ALS

Approach Light Systems

AMSL

Above Mean Sea Level

ANP

Actual Navigation Performance

AOCC

Airline Operations Control Center

AP

Autopilot System

APV

Approach with Vertical Guidance

AR

Authorization Required

ARENA

Areas Noted for Attention

ARFF IC

Aircraft Rescue and Fire Fighting Incident Commander

ARINC

Aeronautical Radio Incorporated

ARO

Airport Reservations Office

ARSA

Airport Radar Service Area

ARSR

Air Route Surveillance Radar

ARTCC

Air Route Traffic Control Center

ASDE-X

Airport Surface Detection Equipment - Model X

ASOS

Automated Surface Observing System

ASR

Airport Surveillance Radar

ASRS

Aviation Safety Reporting System

ASSC

Airport Surface Surveillance Capability

ATC

Air Traffic Control

ATCRBS

Air Traffic Control Radar Beacon System

ATCSCC

Air Traffic Control System Command Center

ATCT

Airport Traffic Control Tower

ATD

Along-Track Distance

ATIS

Automatic Terminal Information Service

ATO

Air Traffic Organization

ATT

Attitude Retention System

AWC

Aviation Weather Center

AWOS

Automated Weather Observing System

AWTT

Aviation Weather Technology Transfer

AWW

Severe Weather Forecast Alert

BAASS

Bigelow Aerospace Advanced Space Studies

BBS

Bulletin Board System

BC

Back Course

BECMG

Becoming group

BVLOS

Beyond Visual Line of Sight

C/A

Coarse Acquisition

CAT

Clear Air Turbulence

CBO

Community-Based Organization

CD

Controller Display

CDI

Course Deviation Indicator

CDR

Coded Departure Route

CERAP

Combined Center/RAPCON

CFA

Controlled Firing Area

CFIT

Controlled Flight into Terrain

CFR

Code of Federal Regulations

COA

Certificate of Waiver or Authorization

CPDLC

Controller Pilot Data Link Communications

CTAF

Common Traffic Advisory Frequency

CVFP

Charted Visual Flight Procedure

CVRS

Computerized Voice Reservation System

CWA

Center Weather Advisory

CWSU

Center Weather Service Unit

DA

Decision Altitude

DCA

Ronald Reagan Washington National Airport

DCP

Data Collection Package

DER

Departure End of Runway

DH

Decision Height

DME

Distance Measuring Equipment

DME/N

Standard DME

DME/P

Precision DME

DoD

Department of Defense

DP

Instrument Departure Procedure

DPU

Data Processor Unit

DRT

Diversion Recovery Tool

DRVSM

Domestic Reduced Vertical Separation Minimum

DVA

Diverse Vector Area

DVFR

Defense Visual Flight Rules

DVRSN

Diversion

EDCT

Expect Departure Clearance Time

EFAS

En Route Flight Advisory Service

EFV

Enhanced Flight Visibility

EFVS

Enhanced Flight Vision System

ELT

Emergency Locator Transmitter

EMAS

Engineered Materials Arresting System

EPE

Estimate of Position Error

ESV

Expanded Service Volume

ETA

Estimated Time of Arrival

ETD

Estimated Time of Departure

ETE

Estimated Time En Route

EWINS

Enhanced Weather Information System

EWR

Newark International Airport

FA

Area Forecast

FAA

Federal Aviation Administration

FAF

Final Approach Fix

FAWP

Final Approach Waypoint

FB

Fly-by

FCC

Federal Communications Commission

FD

Flight Director System

FDC

Flight Data Center

FDE

Fault Detection and Exclusion

FIR

Flight Information Region

FIS

Flight Information Service

FISDL

Flight Information Services Data Link

FLIP

Flight Information Publication

FMS

Flight Management System

FO

Fly-over

FPA

Flight Path Angle

FPV

Flight Path Vector

FPNM

Feet Per Nautical Mile

FRIA

FAA-Recognized Identification Area

FSDO

Flight Standards District Office

FSS

Flight Service Station

GBAS

Ground Based Augmentation System

GEO

Geostationary Satellite

GLS

GBAS Landing System

GNSS

Global Navigation Satellite System

GNSSP

Global Navigation Satellite System Panel

GPS

Global Positioning System

GRI

Group Repetition Interval

GSD

Geographical Situation Display

GUS

Ground Uplink Station

HAT

Height Above Touchdown

HAZMAT

Hazardous Material

HDTA

High Density Traffic Airports

HEMS

Helicopter Emergency Medical Services

HIRL

High Intensity Runway Lights

HRR

Helicopter Rapid Refueling Procedures

HUD

Head-Up Display

Hz

Hertz

IAF

Initial Approach Fix

IAP

Instrument Approach Procedure

IAS

Indicated Air Speed

IAWP

Initial Approach Waypoint

ICAO

International Civil Aviation Organization

IF

Intermediate Fix

IFR

Instrument Flight Rules

ILS

Instrument Landing System

ILS/PRM

Instrument Landing System/Precision Runway Monitor

IM

Inner Marker

IMC

Instrument Meteorological Conditions

InFO

Information For Operators

INS

Inertial Navigation System

IOC

Initial Operational Capability

IR

IFR Military Training Route

IRU

Inertial Reference Unit

ITWS

Integrated Terminal Weather System

JFK

John F. Kennedy International Airport

kHz

Kilohertz

LAA

Local Airport Advisory

LAANC

Low Altitude Authorization and Notification Capability

LAAS

Local Area Augmentation System

LAHSO

Land and Hold Short Operations

LAWRS

Limited Aviation Weather Reporting Station

LDA

Localizer Type Directional Aid

LDA/PRM

Localizer Type Directional Aid/Precision Runway Monitor

LGA

LaGuardia Airport

LIRL

Low Intensity Runway Lights

LLWAS

Low Level Wind Shear Alert System

LLWAS NE

Low Level Wind Shear Alert System Network Expansion

LLWAS-RS

Low Level Wind Shear Alert System Relocation/Sustainment

LNAV

Lateral Navigation

LOC

Localizer

LOP

Line-of-position

LORAN

Long Range Navigation System

LP

Localizer Performance

LPV

Localizer Performance with Vertical Guidance

LUAW

Line Up and Wait

LZ

Landing Zone

MAHWP

Missed Approach Holding Waypoint

MAP

Missed Approach Point

MAWP

Missed Approach Waypoint

MDA

Minimum Descent Altitude

MEA

Minimum En Route Altitude

MEARTS

Micro En Route Automated Radar Tracking System

METAR

Aviation Routine Weather Report

MGOW

Maximum Gross Operating Weight

MHz

Megahertz

MIRL

Medium Intensity Runway Lights

MM

Middle Marker

MOA

Military Operations Area

MOCA

Minimum Obstruction Clearance Altitude

MRA

Minimum Reception Altitude

MRB

Magnetic Reference Bearing

MSA

Minimum Safe Altitude

MSAW

Minimum Safe Altitude Warning

MSL

Mean Sea Level

MTI

Moving Target Indicator

MTOS

Mountain Obscuration

MTR

Military Training Route

MVA

Minimum Vectoring Altitude

MWA

Mountain Wave Activity

MWO

Meteorological Watch Office

NAS

National Airspace System

NASA

National Aeronautics and Space Administration

NAVAID

Navigational Aid

NAVCEN

Coast Guard Navigation Center

NCWF

National Convective Weather Forecast

NDB

Nondirectional Radio Beacon

NEXRAD

Next Generation Weather Radar

NGA

National Geospatial-Intelligence Agency

NM

Nautical Mile

NMAC

Near Midair Collision

NOAA

National Oceanic and Atmospheric Administration

NOPAC

North Pacific

NoPT

No Procedure Turn Required

NOTAM

Notice to Airmen

NPA

Nonprecision Approach

NRS

Navigation Reference System

NSA

National Security Area

NSW

No Significant Weather

NTSB

National Transportation Safety Board

NTZ

No Transgression Zone

NWS

National Weather Service

OAT

Outside Air Temperature

OBS

Omni-bearing Selector

ODP

Obstacle Departure Procedure

OIS

Operational Information System

OIS

Obstacle Identification Surface

OM

Outer Marker

OOP

Operations Over People

ORD

Chicago O'Hare International Airport

P/CG

Pilot/Controller Glossary

PA

Precision Approach

PAO

Public Aircraft Operation

PAPI

Precision Approach Path Indicator

PAR

Precision Approach Radar

PAR

Preferred Arrival Route

PC

Personal Computer

PDC

Pre-departure Clearance

PFD

Personal Flotation Device

PIC

Pilot-in-Command

PinS

Point-in-Space

PIREP

Pilot Weather Report

POB

Persons on Board

POFZ

Precision Obstacle Free Zone

POI

Principal Operations Inspector

PPS

Precise Positioning Service

PRM

Precision Runway Monitor

PT

Procedure Turn

QICP

Qualified Internet Communications Provider

RA

Resolution Advisory

RAA

Remote Advisory Airport

RAIM

Receiver Autonomous Integrity Monitoring

RAIS

Remote Airport Information Service

RBDT

Ribbon Display Terminals

RC

Radio-Controlled

RCAG

Remote Center Air/Ground

RCC

Rescue Coordination Center

RCLS

Runway Centerline Lighting System

RCO

Remote Communications Outlet

RID

Remote Identification

RPIC

Remote Pilot-in-Command

RD

Rotor Diameter

REIL

Runway End Identifier Lights

REL

Runway Entrance Lights

RFM

Rotorcraft Flight Manual

RLIM

Runway Light Intensity Monitor

RMI

Radio Magnetic Indicator

RNAV

Area Navigation

RNP

Required Navigation Performance

ROC

Required Obstacle Clearance

RPAT

RNP Parallel Approach Runway Transitions

RVR

Runway Visual Range

RVSM

Reduced Vertical Separation Minimum

RWSL

Runway Status Light

SAA

Sense and Avoid

SAFO

Safety Alerts For Operators

SAM

System Area Monitor

SAR

Search and Rescue

SAS

Stability Augmentation System

SATR

Special Air Traffic Rules

SBAS

Satellite-based Augmentation System

SDF

Simplified Directional Facility

SFL

Sequenced Flashing Lights

SFR

Special Flight Rules

SFRA

Special Flight Rules Area

SGI

Special Government Interest

SIAP

Standard Instrument Approach Procedure

SID

Standard Instrument Departure

SIGMET

Significant Meteorological Information

SM

Statute Mile

SMGCS

Surface Movement Guidance Control System

SNR

Signal-to-noise Ratio

SOIA

Simultaneous Offset Instrument Approaches

SOP

Standard Operating Procedure

SPC

Storm Prediction Center

SPS

Standard Positioning Service

STAR

Standard Terminal Arrival

STARS

Standard Terminal Automation Replacement System

STMP

Special Traffic Management Program

sUAS

Small UAS

TA

Traffic Advisory

TAA

Terminal Arrival Area

TAC

Terminal Area Chart

TACAN

Tactical Air Navigation

TAF

Aerodrome Forecast

TAS

True Air Speed

TCAS

Traffic Alert and Collision Avoidance System

TCH

Threshold Crossing Height

TD

Time Difference

TDLS

Tower Data Link System

TDWR

Terminal Doppler Weather Radar

TDZ

Touchdown Zone

TDZE

Touchdown Zone Elevation

TDZL

Touchdown Zone Lights

TEC

Tower En Route Control

THL

Takeoff Hold Lights

TIS

Traffic Information Service

TIS-B

Traffic Information Service-Broadcast

TLS

Transponder Landing System

TPP

Terminal Procedures Publications

TRSA

Terminal Radar Service Area

TRUST

The Recreational UAS Safety Test

TSO

Technical Standard Order

TWIB

Terminal Weather Information for Pilots System

U.S.

United States

UA

Unmanned Aircraft

UAM

Urban Air Mobility

UAS

Unmanned Aircraft System

UASFM

UAS Facility Map

UAV

Unmanned Aerial Vehicle

UFO

Unidentified Flying Object

UHF

Ultrahigh Frequency

USCG

United States Coast Guard

UTC

Coordinated Universal Time

UTM

UAS Traffic Management

UWS

Urgent Weather SIGMET

UWS

Urgent Weather SIGMET

VAR

Volcanic Activity Reporting

VASI

Visual Approach Slope Indicator

VCOA

Visual Climb Over the Airport

VDA

Vertical Descent Angle

VDP

Visual Descent Point

VFR

Visual Flight Rules

VGSI

Visual Glide Slope Indicator

VHF

Very High Frequency

VIP

Video Integrator Processor

VLOS

Visual Line of Sight

VMC

Visual Meteorological Conditions

V _MINI

Instrument flight minimum speed, utilized in complying with minimum limit speed requirements for instrument flight

VNAV

Vertical Navigation

V _NE

Never exceed speed

V _NEI

Instrument flight never exceed speed, utilized instead of V _NE for compliance with maximum limit speed requirements for instrument flight

VO

Visual Observer

VOR

Very High Frequency Omni-directional Range

VORTAC

VHF Omni-directional Range/Tactical Air Navigation

VOT

VOR Test Facility

VR

VFR Military Training Route

V _REF

The reference landing approach speed, usually about 1.3 times V _so plus 50 percent of the wind gust speed in excess of the mean wind speed.

V _SO

The stalling speed or the minimum steady flight speed in the landing configuration at maximum weight.

VTF

Vector to Final

VV

Vertical Visibility

VVI

Vertical Velocity Indicator

V _Y

Speed for best rate of climb

V _YI

Instrument climb speed, utilized instead of V _Y for compliance with the climb requirements for instrument flight

WA

AIRMET

WAAS

Wide Area Augmentation System

WFO

Weather Forecast Office

WGS-84

World Geodetic System of 1984

WMO

World Meteorological Organization

WMS

Wide-Area Master Station

WMSC

Weather Message Switching Center

WMSCR

Weather Message Switching Center Replacement

WP

Waypoint

WRA

Weather Reconnaissance Area

WRS

Wide-Area Ground Reference Station

WS

SIGMET

WSO

Weather Service Office

WSP

Weather Systems Processor

WST

Convective Significant Meteorological Information

WW

Severe Weather Watch Bulletin