NOTAM (Notice to Airmen) Acronyms

Information sourced from ProAirPilot.

A

A Absolute

A Alaskan Standard Time

A Amber

A Arctic (air mass)

A/A Air to Air

A/C Approach Control

A/G Air to Ground

A/H Already Had

AAC Alaskan Air Command

AAD Assigned Altitude Deviation

AADC Approach and Departure Control

AAF Army Air Field

AAITVL Arrival Aircraft Interval

AAL Above Aerodrome Level

AAL Alaskan Region

AAP Advise if Able to Proceed

AAR Airport Arrival Rate

AARTE Airport Acceptance Rate

AATM At All Times

AAWF Auxiliary Aviation Weather Facility

AAWTA Advise at What Time Able

AB Airborne

ABBR Abbreviate

ABCST Automatic Broadcast

ABD Aboard

ABI Advance Boundary Information

ABLCHG Airborne Launching

ABM Abeam

ABN Aerodrome Beacon

ABND Abandon

ABNDT Abundant

ABNML Abnormal

ABT About

ABV Above

AC Advisory Circular

AC Altocumulus

AC Assistant Chief

ACA Artic Control Area

ACARS Aircraft Communication Addressing and Reporting System

ACAS Airborne Collision Avoidance System

ACC Altocumulus Castellanus

ACC Area Control Center

ACCID Notification of Aircraft Accident

ACCT Account

ACCUM Accumulate

ACDNT Accident

ACDO Air Carrier District Office

ACE Central Region

ACES Access

ACFT Aircraft

ACID Aircraft Identification

ACK Acknowledge

ACL Altimeter Check Location

ACLD Above Clouds

ACLS Automatic Carrier Landing System

ACLT Accelerate

ACM Air combat maneuvers

ACN Aircraft Classification Number

ACN All Concerned Notified

ACNOT Accident Notice

ACP Acceptance (message type designator)

ACP Area Command Post

ACPT Accept

ACPY Accompany

ACR Air Carrier

ACRBT Acrobatic

ACRS Across

ACSL Standing Lenticular Altocumulus

ACT Active or Activated or Activity

ACT Air Combat Training

ACT Technical Center

ACTG Acting

ACTV Active

ACTVT Activate

ACW Aircraft Control and Warning

ACYC Anticyclonic

AD Aerodrome

ADA Advisory Area

ADAP Airport Development Aid Program

ADC Aerodrome Chart

ADCF Air Defense Control Facility

ADCON Advise or issue instructions to all concerned

ADCUS Advise Customs

ADDN Addition

ADE Air Defense Emergency

ADF Automatic Direction Finder

ADFAP Automatic Direction Finder Approach

ADIZ Air Defense Identification Zone

ADJ Adjacent

ADL Aggregate Demand List

ADLO Air Defense Liaison Officer

ADLY Arrival Delay

ADMAP Advise by Air Mail as Soon as Possible

ADMIN Administration

ADMIR Administrator

ADMIS Aircraft Departing at (number of minutes) Interval

ADMIV Administrative

ADNL TFC Additional Traffic

ADNOK Advise if not correct

ADO Aerodrome Office (specify service)

ADO Airport District Office

ADP Automatic Data Processing

ADPE Automatic Data Processing Equipment

ADPS Automatic Data Processing Systems

ADQT Adequate

ADR Advisory Route

ADR Airport Departure Rate

ADRDE Advise Reason for Delay

ADRNDCK Adirondack

ADRT Alternate Departure Route

ADS Address

ADS Air Defense Sector

ADS Automatic Dependent Surveillance

ADSPN Advise Disposition

ADSU Automatic Dependent Surveillance Unit

ADV Advise

ADVALT Allotment Advice

ADVC Advice

ADVCTN Advection

ADVN Advance

ADVY Advisory

ADVZY Advisory

ADW Air Defense Warning

ADZ Advise

ADZAR Advise Arrival

ADZI Advise Intentions

ADZOF Advise This Office

ADZY Advisory

AEA Eastern Region

AEM Aircraft and Engine Mechanic

AENG Airways Engineer

AER Approach End Runway

AERO Aeronautical

AES Aircraft Earth Station

AEU Europe Africa and Middle East Office

AEVAC Air Evacuation

AEW Airborne Early Warning

AFB Air Force Base

AFC Area Forecast Center

AFCT Affect

AFD Airport Facility Directory

AFDK After Dark

AFIL Filed Flight Plan in the Air

AFIO Authorization for Interceptor Operations

AFIRM Affirmative

AFIS Aerodrome Flight Information Service

AFJ Air Force Jet

AFM Affirmative

AFNEA Air Force NOTAM Exchange Area

AFNEO Air Force NOTAM Exchange Office

AFOVRN Air Force Overrun (1000ft standard approach lighting system)

AFREP Air Force Representative

AFRT Air Freight

AFS Aeronautical Fixed Service

AFSS Automated Flight Service Station

AFT After

AFTN Aeronautical Fixed Telecommunications Network

AFTN Afternoon

AG Air Ground

AGA Aerodromes Air Routes and Ground Aids

AGACS Automatic Ground Air Ground Communication System

A-GEAR Arresting Gear

AGL Above Ground Level

AGL Great Lakes Region

AGN Again

AGR Agree

AGRMT Agreement

AHD Ahead

AI Arrival Approved Request for IFR Flight

AIA Advise if Able

AIATSC All International Air Traffic Switching Centers

AIC Aeronautical Information Circular

AID Airport Information Desk

AIDC Air Traffic services Inter facility Data Communication

AIFP Activate IFR Flight Plan

AILS Automatic Instrument Landing System

AIM Airman’s Information Manual

AIP Aeronautical Information Publication

AIRAC Aeronautical Information Regulation and Control

AIRCOMNET Air Force Communications Network

AIREP Air Report

AIRFL Air Refueling

AIRMET Airmen's Meteorological Information

AIROPNET Air Operations Network

AIS Aeronautical Information Service

AIS Aeronautical Information Specialist

AIS Airport in sight

AL All Field Offices and Personnel

AL Annual Leave

AL/At Least (altitude)

ALA Alighting Area

ALACFO All Air Carrier Field Offices

ALADLO All Air Defense Liaison Officers in Service Area

ALAFFO All Technical Operations

ALANO All Accident Notice Offices

ALARTC All Air Route Traffic Control Centers in Service Area

ALAT All Air Traffic Service Personnel in Service Area

ALATAS All Air Traffic (area) Supervisors in Service Area

ALATF All Air Traffic Field Facilities

ALATFO All Air Traffic Field Offices

ALCKT All Offices Having Send−receive Teletypewriter Service on Circuit

ALCS/C All Air Traffic Combined Station/ Centers in Service Area

ALCS/T All Air Traffic Combined Station/ Towers in Service Area

ALCT Attempt to Locate

ALDA Air Line Dispatchers Association

ALERFA Alert Phase Code (alerting service)

ALF Aloft

ALFAB All Offices on NADIN

ALFSFO All Flight Standards Field Offices

ALFSS All Flight Service Stations in Service Area

ALG Along

ALGHNY Allegheny

ALIATSC All International Aeronautical Telecommunication Switching Centers

ALIFO All International Field Offices

ALIFSS All International Flight Service Stations in Service Area

ALNMT Alignment

ALNOT Alert Notice

ALP Airport Layout Plan

ALPA Air Line Pilots Association

ALQDS All Quadrants

ALR Alerting

ALRAFAC All Radar Facilities in Service Area

ALRGN All Regional Service Area Offices

ALS Approach Light System

ALSEC All Sectors

ALSF Approach Lighting System With Sequenced Flashing Lights

ALSF1 Approach Lighting System With Sequenced Flashers Cat 1

ALSF-1 Approach Lighting System With Sequenced Flashers Cat 1

ALSF2 Approach Lighting System With Sequenced Flashers Cat 2

ALSF-2 Approach Lighting System With Sequenced Flashers Cat 2

ALSFI Approach Lighting System With Sequenced Flashers Cat 1

ALSF-I Approach Lighting System With Sequenced Flashers Cat 1

ALFSII Approach Lighting System With Sequenced Flashers Cat 2

ALSF-II Approach Lighting System With Sequenced Flashers Cat 2

ALSTG Altimeter Setting

ALT Altitude

ALTA Alberta

ALTM Altimeter

ALTN Alternate

ALTPT Alternate Airport

ALTRV Altitude Reservation

ALTWR All Towers in Service Area

ALUTN Aleutian

ALWF Actual Wind Factor

AM Ante Meridiem

AMA Area Minimum Altitude

AMB Ambiguity

AMC Air Mobility Command

AMC Mike Monroney Aeronautical Center

AMCL Amended Clearance

AMD Amend

AMD Amended Forecast

AMDT Amendment

AMECH Account Mechanical

AMGR Airport Manager

AMIS Aircraft Movement Information Services

AMOS Automatic Meteorological Observing System

AMP Amplifier or Amplify

AMPLTD Amplitude

AMRF Amended Route of Flight

AMS Aeronautical Mobile Service

AMS Air Mass

AMS American Meteorological Society

AMSL Above Mean Sea Level

AMSS Aeronautical Mobile Satellite Service

AMT Amount

AMVER Automated Mutual Assistance Vessel Rescue System

ANC Aeronautical Chart

ANCPT Anticipate

ANCS Aeronautical Navigation Chart Small Scale

ANE New England Region

ANF Air Navigation Facility

ANG Air National Guard

ANLYS Analysis

ANM Northwest Mountain Region

ANMS Automatic Network Management System

ANNC Announce

ANR Advanced Navigation Routes

ANRA Air Navigation Radio Aids

ANS Answer

ANT Antenna

AO1 ASOS Automated Observation Without Precipitation Discriminator (rain/snow)

AO2 ASOS Automated Observation With Precipitation Discriminator (rain/ snow)

AOA At or Above

AOAF At or After

AOB At or Below

AOBF At or Before

AOC Aerodrome Obstacle Chart

AOC Airport Operating Certificate

AOCP Aircraft Out of Commission for Parts

AOE Airport of Entry

AOPA Aircraft Owners and Pilots Association

AP Airport

AP Anomalous Propagation

APAP Approach Path Alignment Panel

APAP This list is copywritten and belongs to proairpilot

APAPI Abbreviated Precision Approach Path Indicator

APC Area Positive Control

APCH Approach

APDC Aircraft parking/docking chart

APL Airport Lights

APLCN Appalachian

APN Apron

APNT Appoint

APP Approach Control

APP Approach Control Office

APPA Advise Present Position and Altitude

APPR Appear

APR Airports Program Report

APREQ Approval Request

APRNT Apparent

APROP Appropriate

APRX Approximate

APS Airborne Pulse Search Radar

APSG After Passing

APV Approve

APVL Approval

AR Atlantic Route

ARAC Area Airports Checked

ARAC Army Radar Approach Control Facility

ARAD Altitude Radial

ARB Air Reserve Base

ARC Area chart

ARCP Air Refueling Control Point

AREP Air Refueling Egress Point

AREX Air Refueling Exit

ARFF Aircraft Rescue and Fire Fighting

ARFFOK Airport Rescue and Fire Fighting Alarm Checked

ARFOR Area Forecast

ARINC Aeronautical Radio Incorporated

ARIP Air Refueling Initial Point

ARL Aerial

ARLO Army Liaison Officer

ARMET Forecast upper wind and temperature at specified points

ARML Airmail

ARND Around

ARNG Arrange

ARNOT Area Notice

ARO Air Traffic Services Reporting Office

ARO Airport Reservations Office

ARP Aerodrome Reference Point

ARP Airport Reference Point

ARP Airport Reservation Position

ARP Air Report

ARPT Airport

ARQ Automatic Error Correction Equipment

ARR Arrival or Arrive

ARS Air Rescue Service (USAF)

ARS Special Air Report

ARSA Airport Radar Service Area

ARSR Air Route Surveillance Radar

ARST Arrest

ARTC Air Route Traffic Control

ARTCC Air Route Traffic Control Center

ARTS Automated Radar Terminal Systems

ARU Airborne Radar Unit

ARU Airspace Reservation Unit

ARUNK Arrival Unknown

AS Altostratus

AS/R Automatic Send/Receive

ASAP As Soon As Possible

ASC Ascent to

ASCU Automatic Scanning Control Unit

ASD Airspace Docket

ASDA Accelerate Stop Distance Available

ASDE Airport Surface Detection Equipment

ASE Altimetry System Error

ASGN Assign

ASI Altimeter Setting Indicator

ASIP Airspace Flight Inspection Pilot

ASL Above Sea Level

ASMD Assumed

ASN Antenna Structure Number

ASND Ascend

ASO Southern Region

ASOS Automated Surface Observing System

ASP Airport System Plan

ASP Airspace

ASPH Asphalt

ASR Airport Surveillance Radar

ASSOC Associate

ASST Assistant

ASW Southwest Region

ATA Actual Time of Arrival

ATA Air Transport Association of America

ATAM At and Maintain

ATAR Above Transmitted as Received Air Traffic Control

ATC Air Traffic Control

ATCA Air Traffic Control Association

ATCA ATC Advises

ATCAA ATC Assigned Airspace

ATCBI ATC Beacon Interrogator

ATCC ATC Clears

ATCF ATC Facility

ATCH Attach

ATCOR ATC Operations Representative

ATCR ATC Requests

ATCRBS ATC Radar Beacon System

ATCS ATC Specialist

ATCSCC David J. Hurley Systems Command Center

ATCT Airport Traffic Control Tower

ATD Actual Time of Departure

ATFC Account Traffic

ATFM Air Traffic Flow Management

ATIS Automatic Terminal Information Service

ATLC Atlantic

ATM Air Traffic Management

ATM Authentication Maneuver

ATMT Attempt

ATMTC Attempt to Contact

ATN Aeronautical Telecommunications Network

ATND Attend

ATO Aeronautical Telecommunications Operator

ATO Air Traffic Organization

ATOG Allowable Takeoff Gross Weight

ATP Actual Time of Penetration

ATP Air Traffic Procedures

ATPAC Air Traffic Procedures Advisory Committee

ATR Air Transport Rating

ATREP Air Traffic Representative

ATRLS Actual Time of Release

ATSCCP Air Traffic Service Contingency Command Post

ATT American Telephone and Telegraph Company

ATTM At This Time

ATTN Attention

AT-VASIS Abbreviated T Visual Approach Slope Indicator System

ATZ Aerodrome Traffic Zone

AUGRA Authority Granted

AURBO Aurora Borealis

AUREQ Authority is Requested

AUTH Authority

AUTH Authorized

AUTO Automatic

AUTOB Automatic Weather Reporting System

AUW All Up Weight (gross weight)

AUX Auxiliary

AUZ Authorize

AVANA Altitude reservation void for aircraft not airborne by

AVBL Available

AVFP Activate VFR Flight Plan

AVFPNO Pilot failed to activate VFR/DVFR flight plan

AVG Average

AVGAS Aviation Gasoline

AVN Aviation

AWA Advise When Able

AWANS Aviation Weather and NOTAM System

AWBE Automatic Weather Broadcast Equipment

AWE Advise When Established

AWL All Weather Landing

AWOS Automatic Weather Observing/ Reporting System

AWP Aviation Weather Processors

AWP Western-Pacific Region

AWS Air Weather Service (USAF)

AWT Await or Awaiting

AWX Account Weather

AWY Airway

AXPS Air Express

AZM Azimuth

AZRAN Azimuth and Range Data

B

B Base Leg

B Beginning of precipitation (time in minutes) (weather reports only)

B Bering Standard Time (time groups only)

B Blue

B Center clearance delivered

BA Braking Action

BAC Below All Clouds

BACLIN Baroclinic or Baroclinic Prognosis

BAFVC Bids Accepted for the Following Vacancies

BAL Balance

BASE Cloud Base

BASOPS Base Operations Office

BATROP Barotropic or Barotropic Prognosis

BC Back Course

BC Beginning Climb

BC British Columbia

BC Patchy

BCFG Patchy fog

BCH Beach

BCKG Backing

BCM Back Course Marker

BCM Become

BCN Beacon

BCREQ Broadcast Requested

BCST Broadcast

BCSTN Broadcast Station

BDA Bermuda

BDAT Beacon Data (digitized)

BDR Border

BDRY Boundary

BDSLD Bids Solicited

BECMG Becoming

BFDK Before Dark

BFR Before

BGN Began or Begin

BGND Begin or Beginning Descent

BHND Behind

BIFR Before Encountering IFR Conditions

BINOVC Breaks in Overcast

BKN Broken

BL Blowing

BLD Build

BLDG Building

BLDU Blowing Dust

BLDUP Buildup

BLKHLS Black Hills

BLKT Blanket

BLN Balloon

BLO Below

BLO Below Clouds

BLSA Blowing Sand

BLSN Blowing Snow

BLW Below

BLX Block

BLZD Blizzard

BMBR Bomber

BMS Basic Meteorological Services

BND Bound

BNDRY Boundary

BNTH Beneath

BOMB Bombing

BOVC Base of Overcast

BPOC Before Proceeding On Course

BPS Bytes Per Second

BPT Beginning Procedure Turn

BR Bahama Route

BR Branch

BR Mist

BRAF Braking Action Fair

BRAG Braking Action Good

BRAN Braking Action Nil

BRAP Braking Action Poor

BRF Brief

BRG Bearing

BRGT Bright

BRITE Bright Radar Indicator Tower Equipment

BRK Break

BRKG Braking

BRKHIC Breaks in Higher Overcast

BRKSHR Berkshire

BRM Barometer

BS Commercial Broadcasting Station

BSAF Bids Solicited as Follows

BSC Bird Sweep Completed

BSHP Beginning Standard Holding Procedure

BSIAP Beginning Straight In Approach

BSRAP Beginning Standard Range Approach

BSRO Begin Standard Refuel Orbit

BT Back Taxiing

BTL Between Layers

BTN Between

BTR Better

BTWN Between

BUEC Backup Emergency Communication

BUIC Backup Interceptor Control

BUL Bulletin

BUR Bureau

BUS Business

BY Blowing Spray (weather reports only)

BYD Beyond

BZR Buzzer (radar)

C

C Celsius

C Central Standard Time (time groups only)

C Centre (runway ID)

C Circling (approach and landing charts)

C Continental (air mass)

C/A Coarse/Acquisition

CA Clear Above (PIREP only)

CAAS Class A Airspace

CAC Change to Approach Control

CAC Changing to Approach Control

CAC Contact Approach Control

CACT Civil Air Carrier Turbojet

CADO Chief Airport District Office

CAM Canadian Armed Forces Transport Command

CAN Canada

CANFORCE Canadian Armed Force

CANO Catalogue Number

CANOT Canadian NOTAM

CANR Canadian NORAD Region

CAO Change of Appointing Office

CAP Civil Air Patrol

CAP/IS Combined Approach Control/International Station

CAPD Climb at Pilot’s Discretion

CAPT Captain

CARA Check Area Airports

CARF Central Altitude Reservation Function

CARIB Caribbean

CARU Canadian Airspace Reservation Unit

CAS Calibrated Airspeed

CAS Collision Avoidance System

CASCDS Cascades

CAT Category

CAT Clear Air Turbulence

CATX Climb and Cross

CAUFN Caution Advised Until Further Notice

CAVOK Cloud and Visibility OK

CAVU Clear or scattered clouds and visibility greater than ten miles

CAWS Common Aviation Weather Subsystem

CB Cumulonimbus

CBAS Class B Airspace

CBMAM Cumulonimbus Mamma

CBSA Class B Surface Area

CC Carbon Copy

CC Cirrocumulus

CCA Continental Control Area

CCAS Class C airspace

CCC Central Computer Complex

CCC Regional Communications Control Center

CCD City (or County) Civil Defense Director____

CCFP Collaborative Convective Forecast Product

CCLDS Clear of Clouds

CCLKOB Counterclockwise Orbit

CCLKWS Counterclockwise

CCRU Complete Crew

CCRZ Climb and Cruise

CCSA Class C Surface Area

CCSL Standing Lenticular Cirrocumulus

CCTLR Chief Controller

CCUS Cleared Customs

CD Candela

CD Civil Defense

CD Clearance Delivery

CDAS Class D Airspace

CDC Computer Display Channel

CDFNT Cold Front

CDM Collaborative Decision Making

CDN Coordination

CDO Communications Duty Officer

CDSA Class D Surface Area

CE Communications Equipment

CEAS Class E Airspace

CELNAV Celestial Navigation

CENGR Civil Engineer

CENPAC Central North Pacific

CER Climb En Route

CERAP Combined Center/RAPCON

CERT Certificate

CERTIF Certification

CESA Class E Surface Area

CF Change Frequency

CFA Controlled Firing Area

CFAD Composite Flight Data Processing

CFADC Canadian Forces Air Defense Command

CFAP Cleared for Approach

CFM Confirm

CFN Confine

CFP Cold Front Passage

CFPL Carryover From Previous Log

CFR Code of Federal Regulations

CFWSU Central Flow Weather Service Unit

CFY Clarify

CG Coast Guard

CGAS Class G Airspace

CGAS Coast Guard Air Station

CGL Circling Guidance Light

CGLS Coast Guard LORAN Station

CGSTN Congestion

CH Channel

CH Channel continuity check of transmission to permit comparison of record of channel sequence numbers of messages received on the channel

CHAP Chapter

CHARC Characteristic

CHC Chance

CHG Change

CHGO Changing Over

CHM Chemicals

CHNL Channel

CHOK Check Okay

CHOV Changeover

CHRG Charge

CHSPK Chesapeake

CHTR Charter

CI Cirrus

CIC Controller in Charge

CIDIN Common Data Interchange Network

CIFP Cancel IFR Flight Plan

CIFR Cancel IFR Clearance Previously Given

CIFRR Common IFR Room

CIG Ceiling

CINCNORAD Commander in Chief North American Aerospace Defense Command

CIRNAV Circumnavigate

CIRNOT Circuit Notice

CIRVIS Communications Instructions for Reporting Vital Intelligence Sightings

CIT Near or over large towns

CIV Civil

CK Check

CKT Circuit

CL Centre Line

CL Closing Station

CL Course Line

CLA Clear type of ice formation

CLB Climb

CLBI Climb Immediately

CLBN Crash Locator Beacon

CLBR Calibration

CLD Cloud

CLG Calling

CLKOB Clockwise Orbit

CLKWS Clockwise

CLN Colon

CLNC Clearance

CLODA Closing Date

CLOTO Close This Office

CLR Clear

CLRAP Cleared as Planned

CLRS Clear and Smooth

CLSD Closed

CLST Celestial

CLU Circuit Line Up

CM Centimeter

CMA Comma

CMB Climb to or climbing to

CMNC Commence

CMPCT Compact

CMPL Complete or completed or completion

CMPLT Complete

CMPLX Complex

CMPSN Composition

CMPT Component

CMS Construction Maintenance Supervisor

CMSN Commission

CNCL Cancel

CNCNT Concurrently

CNCT Connect

CNDN Canadian

CNL Cancel

CNLFP Cancel Flight Plan

CNS Communications Navigation and Surveillance

CNS Consolidated NOTAM System

CNSTNT Consistent

CNTR Center

CNTRL Central

CNTRLN Centerline

CNVG Converge

CNVRT Convert

CNVSN Conversion

CNVTV Convective

CO Company

CO County

COB Close of Business

COC Climb on Course

COLL Collect

COM Communication

COMB Combine

COML Commercial

COMLO Compass Locator

COMPR Compare

COMPRT Compartment

CONC Concrete

CONCA Continue Calling Until

COND Condition

CONF Confidential

CONFDC Confidence

CONFIG Configuration

CONFIGN Configuration

CONR Continental NORAD Region

CONS Continuous

CONSO CONSOLAN Facility

CONSOL Consol Beacon

CONSOLAN Low or medium frequency long range navigational aid

CONST Construction

CONT Continue or continued

CONTDVD Continental Divide

CONTH Continue to Hold

CONTR Contract

CONTRAILS Condensation Trails

COORD Coordinate

COORD Coordinates

COP Changeover Point

COPCOM Controllers’ Operations and Procedures Committee

COPT Completed Procedure Turn

COR Correct or corrected or correction

CORAS Corridor Assignment

COREQ Confirming Requisition Follows

COT At the coast

COV Cover

CP Circular Polarization

CPA Crash Phone Activated

CPBL Capable

CPD Coupled

CPDLC Controller Pilot Data Link Communications

CPF Complete Power Failure

CPL Current Flight Plan

CPME Calibration Performance Monitoring Equipment

CPN Air Transport Pulse Radar Navigation Aid

CPS Air Transport Pulse Radar Search

CPTY Capacity

CRAD Composite Radar Data Processing

CRAF Civil Reserve Air Fleet

CRC Circle

CRC Cyclic Redundancy Check

CRCHF Crew Chief

CRLC Circulate

CRS Course

CRT Cathode Ray Tube

CRTFY Certify

CRYPTO Cryptographic

CRZ Cruise

CRZAM Cruise and Maintain

CRZWTR Cruise Well to Right

CS Call Sign

CS Cirrostratus

CS/C Combined Station/ Center

CS/T Combined Station/ Tower

CSATR Climb so as to reach

CSATX Climb so as to cross

CSDR Consider

CSDRBL Considerable

CSLDT Consolidate

CST Coast

CTA Control Area

CTAF Common Traffic Advisory Frequency

CTAM Climb to and maintain

CTAS Controlled airspace

CTAX Climb to and cross

CTC Contact

CTCC Change to Center Control or Changing to Center Control

CTCC Contact Center Control

CTCEN Contact Center

CTGY Category

CTL Control

CTLA Control Area

CTLB Control Boundary

CTLR Controller

CTLZ Control Zone

CTN Caution

CTR Control Zone

CTRAC Common Terminal Radar Approach Control

CTSKLS Catskills

CU Cumulus

CUF Cumuliform

CUFRA Cumulus Fractus

CUSNO Customs has been Notified

CUST Customs

CVFP Cancel VFR Flight Plan

CVINO Clearance Void if Not Off

CVN Convene

CVR Cockpit Voice Recorder

CVR Cover

CVRS Computerized Voice Reservation System

CW Continuous Wave

CWM Change Weight Manifest

CWRC Climb Well to Right of Course

CWSU Center Weather Service Unit

CWTR Climb Well to Right

CWY Clearway

CXA Cancel Approved Arrival

CXD Cancel Approved Departure

CYC Cyclonic

CYCLGN Cyclogenesis

CYL Cylinder

CZM Coastal Zone Management

D

D Danger Area

DA Decision Altitude

DA Departure Approved

DAAR Deviation Approved As Requested

DABRK Daybreak

DAE District Airport Engineer

DAIRE Direct Altitude and Identification Readout Equipment

DALGT Daylight

DAP Do All Possible

DAPD Descend at Pilot’s Discretion

DASI Digital Altimeter Setting Indicator

DATIS Data Link Automatic Terminal Information Service

DATIS Digital Automatic Terminal Information Service

DB Decibel

DB Describe

DBA Doing Business As

DBASI Digital Barometer Altimeter Setting Indicator

DBL Double

DBTF Doubtful

DC Direct Current

DCA Defense Communications Acy

DCAVU Clear or scattered clouds and visibility greater than ten, remainder of report missing (weather reports only)

DCD Double Channel Duplex

DCF Deputy Chief

DCKG Docking

DCLRT Decelerate

DCM Defense Combat Maneuvers

DCMSN Decommission

DCMT Document

DCPC Direct Controller Pilot Communications

DCR Decrease

DCRZ Descend to and Cruise

DCS Defense Communications System

DCS Double Channel Simplex

DCT Direct

DDM Difference in Depth of Modulation

DE From (used to precede the call sign of the calling station)

DECCO Defense Commercial Communications Office

DEF Defense

DEFCON Defense Readiness Conditions

DEG Degree

DELPHO Deliver by Telephone

DEMOL Demolition

DENEB Fog Dispersal Operations

DEP Depart

DEP Departure

DEPT Department

DER Departure End of Runway

DES Descend to or Descending to

DESTN Destination

DETRESFA Distress Phase Code Alerting

DEV Deviation

DEW Distant Early Warning

DEWIZ Distant Early Warning Identification Zone

DFCLT Difficult

DFDR Digital Flight Data Recorder

DFL Daily Flight Log

DFNT Definite

DFRS Differs

DFTI Distance From Touchdown Indicator

DFUS Diffuse

DGCGO Dangerous Cargo

DGNL Diagonal

DGR Danger

DH Decision Height

DI Delay Indefinite

DI Departure approval request for IFR flight

DIAM Diameter

DIF Diffuse

DIR Director

DISABLD Disabled

DISC Discontinue

DISEM Disseminate

DIST Distance

DIST District

DISTR Distribute

DIV Divert

DIV Division

DKTS Dakotas

DLA Delay

DLAC Delay Account Of

DLAT Delay Time

DLC Delay Clearance or Delayed Clearance

DLIC Data Link Initiation Capability

DLT Delete

DLVR Deliver

DLVY Delivery

DLY Daily

DMAAC Defense Mapping Acy Aerospace Center

DMAHC Defense Mapping Acy Hydrographic Center

DME Distance Measuring Equipment

DME/P Precision Distance Measuring Equipment

DMEG DME Co-located with Glide Slope

DMEL DME Co-located with Localizer

DMER DME Tactical air navigation with DME only commissioned

DMEV DME Co-located with VOR

DMG Damage

DMNT Dominant

DMO Directives Management Officer

DMSH Diminish

DMSTN Demonstration

DNA Defense Nuclear Agency

DNG Danger

DNS Dense

DNSLP Downslope

DNSTRM Downstream

DNWND Downwind

DO Deputy Commander for Operations

DO Ditto

DOB Date of Birth

DOC Department of Commerce

DOD Department of Defense

DOE Department of Energy

DOLLY Data Link

DOM Domestic

DOT Department of Transportation

DOT1 Transport One Secretary of Transportation

DOT2 Transport Two Deputy Secretary of Transportation

DP Deep

DP Dew Point

DPCR Departure Procedure

DPNG Deepening

DPT Depth

DPTH Depth

DR Dead Reckoning

DR Direct Route

DR Low Drifting

DRCT Direct

DRCTN Direction

DRDU Low Drifting Dust

DRFT Drift

DRG During

DRIR Direct Readout Infrared

DRMS Distance Root Mean Square

DRR Deployment Readiness Review

DRSA Low Drifting Sand

DRSN Low Drifting Snow

DRZL Drizzle

DS Domestic Services (island operations)

DS Dust Storm

DSATR Descend So as to Reach

DSATX Descend So as to Cross

DSB Double Sideband

DSCNT Descent

DSGND Designated

DSIPT Dissipate

DSN Defense Switching Network

DSND Descend

DSNDI Descend Immediately

DSNT Distant

DSPL Display

DSPLC Displace

DSPN Disposition

DSPRL Dispersal

DSR Desire

DSRGD Disregard

DST Distort

DSTC Distance

DSTND Destined

DTAM Descend to and Maintain

DTAX Descend to and Cross

DTE Data Terminal Equipment

DTF Data Transmission Feature

DTG Date Time Group

DTHR Displaced Runway Threshold

DTL Detail

DTLN International Dateline

DTR Data Transmission Request

DTRM Determine

DTRT Deteriorate

DTS Diplomatic Telecommunications Service

DTW Dual Tandem Wheels

DU Widespread Dust

DUATS Direct User Access Terminal System

DUC Dense Upper Cloud

DUPE Duplicate

DUPE Duplicate Message

DUR Duration

DURC During Climb

DURD During Descent

DURG During

DURN Duration

DV Distinguished Visitors

DVFR Day Visual Flight Rules

DVFR Defense Visual Flight Rules

DVLP Develop

DVOLMET Data Link

DVOR Doppler VHF Omnidirectional Radio Range

DVRG Diverge

DVRSN Diversion

DVV Downward Vertical Velocity

DW Dual Wheels

DWG Drawing

DWNDFTS Downdrafts

DWPNT Dew Point

DWRC Descend Well to Right of Course

DWTR Descend Well to Right

DX Duplex

DZ Drizzle

E

E East or Eastern longitude

E Eastern Standard Time (time groups only)

E Ending of precipitation (time in minutes) (weather reports only)

E Equatorial (air mass)

E/G Engineerator

E/R Exchange and Repair

EACLN Expect Approach Clearance

EACNL Expect Approach Clearance Not Later Than

EADIZ Entering Air Defense Identification Zone

EARTS En Route Automated Radar Tracking System

EAS Equivalent Airspeed

EAT Expected Approach Time

EB Eastbound

EBND Eastbound

ECA Enter Control Area

ECAS Enter Controlled Airspace

ECD Except Change Departure to Read

ECM Electronic Counter Measures

ECMSN Electronic Counter Measure Mission

ECOM En Route Communications

ECR Except Change Route to Read

ECSP Electronic Specialist

EDA Early Departure Authorized

EDC Expect Departure Clearance At

EDCT Estimated Departure Clearance

EDR Expect Departure Release At

EEE Error (to be used in AFS as a procedure signal)

EEM Electronic Equipment Modification

EENGR Electrical Engineer

EEP End Exercise Point

EET Estimated Elapsed Time

EFA Entire Field Available

EFAS En Route Flight Advisory Service

EFC Expect Further Clearance At

EFCT Effect

EFF Effective

EFR Expect Further Routing

EFTO Encrypt for Transmission Only

EG Emergency Gear

EGECON Electronic Geographic Coordinator Navigation System

EHA Expect Higher Altitude

EHF Extremely High Frequency (30000 to 300000 MHz)

EIT Electronic Installation Technician

ELAT Estimated Latitude

ELBA Emergency Location Beacon Aircraft

ELEC Electric

ELECN Electrician

ELEV Elevate or elevation

ELIP Elliptical

ELMT Electronic Mechanic Technician

ELNGT Elongate

ELONG Estimated Longitude

ELR Extra Long Range

ELSW Elsewhere

ELT Emergency Locator Transmitter

EM Emission

EMBD Embedded (in cloud layer)

EMBDD Embedded

EMDO Engineering and Manufacturing District Office

EMERG Emergency

EMI Electronic Maintenance Inspector

EMSU Environment Meteorological Support Unit

EMT Electronic Maintenance Technician

ENCTR Encounter

END Stopend (related to RVR)

ENDCE Endurance

ENDG Ending

ENE East North East

ENERN East North Eastern (weather reports only)

ENEWD East North Eastward (weather reports only)

ENG Engine

ENGR Engineer

ENHNCD Enhanced

ENHNCMNT Enhancement

ENR Enroute

ENRC Enroute Chart (followed by name/ title)

ENRT En Route

ENTR Entire

EOBT Estimated Off Block Time

EOD Entered On Duty

EOF Expected Operations Forecast

EP En Route Penetration

EPI Expanded Position Indicator

EQCRT Equipment Certified

EQPT Equipment

EQUIP Equipment

ER Here

ERAD En Route Radar (broadband)

ERMG En Route Metering

ERSP En Route Spacing Program

ERY Early

ESCAT Emergency Security Control of Air Traffic

ESE East South East

ESEC En Route Secondary Radar Beacon

ESERN East South Eastern

ESEWD East South Eastward

ESNTL Essential

ESP En Route Sequencing Program

EST Estimate or estimation

ESTAB Establish

ESV Expanded Service Volume

ET Electronic Technician

ETA Estimated Time of Arrival

ETARS En route tracking automatic radar service

ETC Et Cetera

ETD Estimated Time of Departure

ETE Estimated Time En Route

ETFL Each Thousand Foot Level

ETI Estimated Information

ETIM Elapsed Time

ETO Estimated Time Over Significant Point

ETOV Estimated Time Over

ETP Estimated Time of Penetration

ETR Eastern Test Range

EU Electronic Unit

EUO Emergency Use Only

EV Every

EVAC Evacuation

EVAL Evaluate or evaluation

EVE Evening

EVS Electronic Voice Switching System

EVT Expect Vector To

EXAM Examination

EXC Except

EXCH Exchange

EXCLD Exclude

EXCLV Exclusive

EXCP Except

EXCT Execute

EXDLVY Expedite Delivery

EXEC Executive

EXEC1 President on board civil aircraft

EXEC1F President’s family is aboard aircraft

EXEC2 Vice President is aboard civil aircraft

EXEC2F Vice President’s family is aboard aircraft

EXER Exercise

EXP Expect

EXPC Expect

EXPED Expedite

EXPHO Expedite Delivery by Telephone

EXPS Express

EXQF Expanded Quota Flow

EXREP Expedite Mail Reply

EXSEC Extra Section

EXSHI Expedite Shipment

EXTD Extend

EXTN Extension

EXTRAP Extrapolate

EXTRM Extreme

EXTSV Extensive

F

F Cleared to fix

F Fahrenheit

F Flight Inspection

FA Area Forecast

FA CENTER Aviation Area Forecast Center

FA Final Approach

FA Fuel Advisory

FAA Federal Aviation Administration

FAA For an Approach To

FAA1 SafeAir OneFederal Aviation Administration Administrator

FAA2 SafeAir TwoFederal Aviation Administration Deputy Administrator

FAAP Federal Aid to Airports Program

FAC Facility

FACF Facility Chief

FACSFAC Fleet Area Controlled and Surveillance Facility

FAD Fuel Advisory Departure

FAF Final Approach Fix

FAFAB FSS Assumes Flightplan Area and Service B

FAH Fahrenheit

FAL Facilitation of International Air Transport

FAM Familiar or familiarization

FAMAE Following Amendment Authorized Effective

FAP Final Approach Point

FAR Federal Aviation Regulations

FATFL FSS Assumes Control of Tower Frequencies and Lights

FAX Facsimile

FBO Fixed Base Operator

FC Funnel Cloud

FCA Frequency Change Approved

FCC Federal Communications Commission

FCFSS Contract Flight Service Station

FCO Facility Coordination Officer

FCRP Field Condition Report

FCST Forecast

FCTA Flow Control Time of Arrival

FCWOS Contract Weather Observing Station

FDAT Flight Data

FDC Flight Data Center

FDDL Frequency Division Data Link

FDEP Flight Data Entry and Printout

FDI Fault Detection and Isolation

FDIO Flight Data Input/Output

FDIOR Flight Data Input/Output Repeater

FDPS Flight Data Processing System

FE Flight Engineer

FENKN Fuel Supply Unknown

FENTL Fuel Supply Until

FEW Cloud Coverage 1/8th to 1/4th of sky

FEXHA Fuel Supply Exhausted

FFC For Further Clearance

FFLT Familiarization Flight

FFMN Fixed Federal Monitoring Network

FFR Fire Fighting

FG Fog

FGSB FSS Guarding Service B

FI/P Flight Information (permanent)

FI/T Flight Information (temporary)

FIBI Filed But Impracticable to Transmit

FIC Flight Information Center

FICON Field Condition

FIDO Flight Inspection District Office

FIFO Flight Inspection Field Office

FIFOH Flight Inspection Field Office High Altitude

FIFP Filed IFR Flight Plan

FIG Figure

FIG Flight Inspection Group

FIL Filament

FILG Filling

FILS Florescan Instrument Landing System

FINO Weather report will not be filed for transmission

FIR Flight Information Region

FIRAV First Available

FIRB Flight Information Region Boundary

FIRG Firing

FIRIV Arrival report will be filed with

FIS Flight Information Service

FISA Automated flight information service

FL Flash Advisory

FL Flight Level

FLCTN Fluctuation

FLD Field

FLDST Flood Stage

FLG Falling

FLG Flashing

FLIDAP Flight Data Position

FLIP Flight Information Publication

FLORL Fluorescent Runway Lighting (floodlight system)

FLR Flares

FLRY Flurry

FLT Flight

FLTCK Flight Check

FLTO Flight Orders

FLTWO Flight Watch Outlet

FLUC Fluctuating

FLW Follow

FLWIS Flood Warning Issued

FM Fan Marker

FM From

FMAP Fan Marker Approach

FMH Fan Marker Located with Radio Beacon

FMO Frequency Management Officer

FMS Flight Management System

FMT Format

FMU Flow Management Unit

FNA Final Approach

FNCTN Function

FNT Front

FNTGNS Frontoesis

FNTLYS Frontolysis

FOB Fuel On Board

FOD Foreign Object Debris

FONE Telephone

FORNN Forenoon

FP Flight Plan

FPA Flight Plan Area

FPB Flight Progress Board

FPDI Flight Path Deviation Indicator

FPL Filed Flight Plan

FPL Full Performance Level

FPM Feet Per Minute

FPN Fixed Pulse Radar Navigation Aid

FPNO Flight Plan Not Received

FPP From Present Position

FPR Flight Plan Route

FPRC For Possible Reclearance

FPWA Further Particulars When Available

FQT Frequent

FR Fuel Remaining

FRC Full Route Clearance

FRD Fix Radial Distance

FREQ Frequency

FRFAB FSS Returns Flight Plan Area and Service B

FRH Fly Runway Heading

FRM Form

FRMG Forming

FRMN Formation

FRNG Firing

FROPA Frontal Passage

FROSFC Frontal Surface

FRQ Frequent

FRSB FSS Returns Service B

FRST Frost

FRTFL FSS Returns Control of Tower Frequencies and Lights

FRWF Forecast Wind Factor

FRZ Freeze

FRZLVL Freezing Level

FRZN Frozen

FSDO Flight Standards District Office

FSL Full Stop Landing

FSM Flight Schedule Monitor

FSNFO Flight Standards National Field Office

FSP Flight Strip Printer

FSS Flight Service Station

FT Feet

FT Filing Time

FT Foot

FTAR Following Transmitted as Received (message handling)

FTHR Farther or further

FTHRD Feathered

FTS Federal Telecommunications System

FU Smoke

FURN Furnish

FV Forward Visibility (miles)

FVFP Filed VFR Flight Plan

FW/SIFR Fixed Wing Special IFR

FW/SVFR Fixed Wing Special VFR

FWA Flight Watch Area

FWC Fleet Weather Central

FWCS Flight Watch Control Station

FWD Forward

FWDC Forward Collect

FWP Flight Watch Point

FWRNG Fire Warning

FWS Flight Watch Specialist

FWU Flight Watch Unit

FYI For Your Information

FZ Supercooled/freezing

FZDZ Freezing Drizzle

FZFG Freezing Fog

FZRA Freezing Rain

FZRANO Freezing Rain Sensor Not Available

G

G Green

G Gusts reaching (knots) (weather reports only)

G/A Ground to Air

G/A/G Ground to Air and Air to Ground

GA General Aviation

GA Glide Angle

GA Go ahead resume sending (to be used in AFS as a procedure signal)

GADO General Aviation District Office

GALS Gallons

GBA Give Better Address

GBAS Ground Based Augmentation System

GBL Government Bill of Landing

GBR Give Better Reference

GC Ground Control

GCA Ground Control Approach

GCI Ground Control Intercept

GCO Ground Communication Outlet

GDP Ground Delay Program

GDPGM Ground Delay Program

GEO Geographic

GEOREF Geographical Reference

GES Ground Earth Station

GHZ Gigahertz

GIC GPS Integrity Channel

GICG Glaze Icing

GLD Glider

GLDR Glider

GLFALSK Gulf of Alaska

GLFCAL Gulf of California

GLFMEX Gulf of Mexico

GLFSTLAWR Gulf of St Lawrence

GLONASS Global Orbiting Navigation Satellite System

GLS GBAS Landing System

GMC Ground Movement Chart (followed by name/title)

GMT Greenwich Mean Time

GND Ground

GNDCK Ground Check

GNDFG Ground Fog

GNSS Global Navigation Satellite System (in general)

GNTR Generator

GOV Governor

GOVT Government

GP Glide Path

GPI Ground Point of Intercept

GPS Global Positioning System

GQA Get Quick Answer

GR Hail (greater than 3/4”)

GRAD Gradient

GRADU Gradual

GRASS Grass landing area

GRBL Garble

GRBNKS Grand Banks

GRDL Gradual

GRID Grid point values of processed meteorological data

GRTLKS Great Lakes

GRVL Gravel

GS Glide Slope

GS Ground Speed

GS Ground Stop

GS Snow pellets/small hail (less than 1/4”)

GSA General Services Administration

GSDO General Safety District Office

GSI General Safety Inspector

GSTS Gusts

GSTY Gusty

GTC Gain Time Control

GTCL Great Circle

GTR Greater

GUND Geoid Undulation

GV Ground Visibility

GVG Giving

GVH Government Vehicle

GWT Gross Weight

H

H24 Continuous 24 hour service

HAA Height Above Airport

HADA Hawaiian Defense Area

HADD Hawaiian Air Defense Division

HADIZ Hawaiian Air Defense Identification Zone

HAL Height Above Landing

HANG Hawaiian Air National Guard

HAPI Holding as Previously Instructed

HARS Hazardous Area Reporting Service

HAT Height Above Touchdown

HAZ Hazard

HAZMAT Hazardous Material

HB Homing Beacon

HBN Hazard Beacon

HCVIS High Clouds Visible

HDATZ High Density Traffic Zones

HDF High Frequency Direction Finding Station

HDFRZ Hard Freeze

HDG Heading

HDOP Horizontal Dilution of Precision

HDSVLY Hudson Valley

HDTA High Density Traffic Airport

HDWND Headwind

HEAD Head of State Status

HEL Helicopter

HELI Heliport

HF High Frequency

HFR Hold for Release

HGT Height

HHE Household Effects

HI High

HIALS High Intensity Approach Light System

HIBAL High Altitude Balloon

HIEAT Highest Temperature Equaled for all Time

HIEFM Highest Temperature Equaled for the Month

HIESE Highest Temperature Equaled so Early

HIESL Highest Temperature Equaled so Late

HIFOR High Level Forecast

HIRIV How will arrival report be filed concerning

HIRL High Intensity Runway Lights

HITMP Highest Temperature

HIWAS Hazardous Inflight Weather Advisory Service

HIXAT Highest Temperature Exceeded for all Time

HIXFM Highest Temperature Exceeded for the Month

HIXSE Highest Temperature Exceeded so Early

HIXSL Highest Temperature Exceeded so Late

HJ Sunrise to sunset

HLDG Holding

HLF Half

HLSTO Hailstones

HLTP Hilltop

HN Sunset to sunrise

HND Hundred

HNGR Hangar

HO Service available to meet operational requirements

HOL Holiday

HOP Handoff Point

HOP Helicopter Operations

HOSP Hospital Aircraft

HOW Handover Word

HP Holding Pattern

HPA Hectopascal

HQ Headquarters

HR Here

HR Hour

HRZN Horizon

HS Service available during scheduled operations

HTN Heterodyne

HTR Heater

HUM Humanitarian Mission

HURCN Hurricane

HUREP Hurricane Report

HV High Voltage

HVDF High and very high frequency direction finding stations

HVY Heavy

HWVR However

HWY Highway

HX High Index

HX No specific working hours

HYD Hydraulic

HYDRO Hydrographic

HYR Higher

HZ Haze

Hz Hertz

I

I/IFR Intermittent Instruments

IAARC International Administrative Aeronautical Radio Conference

IAC Instrument Approach Chart

IAD If Authorized DME May be Used

IAF Initial Approach Fix

IAO In and out of clouds

IAP Instrument Approach Procedure

IAR Intersection of Air Routes

IAS Indicated Air Speed

IATA International Air Transport Association

IATSC International Aeronautical Telecommunications Switching Center

IAW In Accordance With

IBASF Intervals Between Aircraft in Stream Type Formation

IBN Identification Beacon

IBND Inbound

IC Ice Crystals

IC Icing (PIREP only)

ICAO International Civil Aviation Organization

ICD Interface Control Document

ICG Icing

ICGIC Icing in Clouds

ICGICIP Icing in Clouds and Precipitation

ICGIP Icing in Precipitation

ID Identify or identifier

IDAT Interfacility Data

IDENT Identification

IDP Individual Development Plan

IF Intermediate approach fix

IF Intermediate Fix

IFAMP If Approach Missed Proceed

IFF Identification Friend/Foe

IFHOL If Holding

IFIM International Flight Information Manual

IFINS If Instrument Conditions Encountered

IFO International Field Office

IFO Interphone

IFONO Interphone (service F) not operative

IFORO Interphone (service F) resumed operation

IFPFP Individual Flight Plans from this Point

IFR Instrument Flight Rules

IFSS International Flight Service Station

IFUN If Unable

IFVLS If Flight Visibility Becomes Less Than

IFVR If Visibility Remains

IGA International General Aviation

IGIA Interacy Group on International Aviation

IIA If incorrect Advise

IISD If incorrect Service Direct

ILAS Instrument Low Approach

ILS Instrument Landing System

ILSP Instrument Landing System Partial

IM Inner Marker

IMAP Immediately After Passing

IMC Instrument Meteorological Conditions

IMDT Immediate

IMF Interrogation Sign

IMG Immigration

IMI Intensity Unknown

IMP Impracticable

IMPL Impulse

IMPR Improve

IMPT Important

IMT Immediate or immediately

IN Inch

INA Initial Approach

INADQT Inadequate

INATS Interruption of Air Traffic Services

INBD Inbound

INC In Clouds

INC Incorporated

INCERFA Uncertainty phase code (alerting service)

INCL Include

INCLV Inclusive

INCOMP Incomplete

INCOR Incorrect

INCR Increase

INDC Indicate

INDEF Indefinite

INDUS Industrial

INF Inland Navigation Facility

INFO Information

INIT Initial Training

INLD Inland

INOF If not off

INOP Inoperative

INP If Not Possible

INPR In Progress

INREQ Information Request

INS Inertial Navigation System

INSP Inspect

INST Instrument

INSTA Instruments Authorized

INSTA Interstate

INSTBY Instability

INSTL Install

INSTR Instruct

INSTR Instrument

INSUF Insufficient Scheduled Time Available

INSUF Unable to Finish

INT Intersection

INTCNTL Intercontinental

INTCP Intercept

INTD Intend

INTER Intermittent

INTFC Interference

INTL International

INTMD Intermediate

INTMT Intermittent

INTNS Intentions

INTR Interior

INTRG Interrogator

INTRMTRGN InterMountain Region

INTRP Interrupt

INTS Intense

INTSF Intensify or intensifying

INTSFY Intensify

INTST Intensity

INTVL Interval

INTXN Intersection

INVES Investigate

INVOF In the Vicinity Of

INVRN Inversion

INVSTAR Investigate and report

IOVC In Overcast

IP Initial Point

IP Instructor Pilot

IP/HHCL Initial Point/Hour Control Line

IPV Improve

IR Ice on Runway

IR IFR Military training route

IRAC Interdepartmental Radio Advisory Committee

IRAD Inbound Radial

IREG Irregular

IRN Interface Revision Notices

IS Island

ISA International Standard Atmosphere

ISB Independent Sideband

ISMGR Island Manager

ISMLS Interim Standard Microwave Landing System

ISOL Isolate

ITCK Issue Time Check

ITNRNT Itinerant

ITRY Itinerary

ITU International Telecommunications Union

IVFRC In VFR Conditions

J

JAL Jet Approach Landing Charts

JATO Jet Assisted Takeoff

JAWYS Join Airways

JBAR Jet Runway Barrier

JCTN Junction

JOUR Journeyman

JP Jet Penetration

JPAP Jet Penetration Approach

JTST Jet Stream

JTSTR Jet Stream

K

K Cold (air mass)

KC Kilocycles

KEPOA Keep this Office Advised

KFRST Killing Frost

KG Kilogram

KHZ Kilohertz

KIAS Knots Indicated Airspeed

KM Kilometers

KMH Kilometers Per Hour

KPA Kilopascal

KT Knots

KW Kilowatt

L

L Left

L Locator

L Logistics

L/MF Low/Medium Frequency

LA Low Approach

LAA Local Airport Advisory

LAADR Low Altitude Arrival/Departure Routing

LAAS Local Area Augmentation System

LAB Laboratory

LABRDR Labrador

LABS Leased Service A/B System

LABS Low Altitude Bombing System

LADP Local Airport Deicing Plan

LAM Logical Acknowledgment

LAN Inland

LARCT Last Radio Contact

LAT Latitude

LAWRS Limited Aviation Weather Reporting Station

LB Left Base

LB Pounds

LC Local Control

LCA Locally

LCL Local or locally

LCT Locate

LCTMP Little Change in Temperature

LD Long Distance

LDA Landing Distance Available

LDA Localizer Type Directional Aid

LDG Landing

LDI Landing Direction Indicator

LDIN Lead in Lighting System

LEN Length

LETFO Letter Follows

LF Low Frequency

LFC Laminar Flow Control

LFNT Low Frequency Intersection

LFR Low Frequency Radio Range

LFT Lift

LGRNG Long Range

LGT Light

LGTD Lighted

LGWV Long Wave

LICOF Land Lines Communications Facilities

LIFR Low IFR

LIH Light Intensity High

LIL Light Intensity Low

LIM Light Intensity Medium

LIN Linearity

LIRL Low Intensity Runway Edge Lights

LK Lake

LKLY Likely

LKTYP Like Type

LL Landline

LLWAS Low Level Wind Shear Alert System

LLWS Low Level Wind Shear

LLZ Localizer

LM Locator Middle

LMM Compass locator at ILS middle marker

LMT Limit

LMT Local Mean Time

LN Line

LNAV Lateral Navigation

LND Land

LNDG Landing

LO Liaison Officer

LO Outer Locator

LOA Letter of Agreement

LOC Localizer

LOCOR Local Coordinator

LODISNAV Long Distance Navigation

LOEAT Lowest Temperature Equaled for all Time

LOEFM Lowest Temperature Equaled for the Month

LOESE Lowest Temperature Equaled so Early

LOESL Lowest Temperature Equaled so Late

LOM Compass locator at ILS outer marker

LONG Longitude

LONGL Longitudinal

LOP Line of Position

LORAC Long Range Accuracy

LORAN Long Range Air Navigation System

LOTMP Lowest Temperature

LOXAT Lowest Temperature Exceeded for all Time

LOXFM Lowest Temperature Exceeded for the Month

LOXSE Lowest Temperature Exceeded so Early

LOXSL Lowest Temperature Exceeded so Late

LP Left Traffic Pattern

LP Linear Polarization

LP Liquid Propane

LP Localizer Performance Without Vertical Guidance

LPV Localizer Performance With Vertical Guidance

LR The last message received by me was

LRA Landing Rights Airport

LRCOM Long Range VHF/UHF Communications

LRG Large

LRG Long Range

LRS Lake Reporting Service

LS Left Side

LS Last message sent by me was or last message was

LSQ Line Squall

LSR Loose Snow on Runway

LST Local Standard Time

LT Turn left after takeoff

LTAV Light and Variable

LTD Limited

LTF Local Training Flight

LTFC Landing Traffic

LTGCA Lightning Cloud to Air

LTGCC Lightning Cloud to Cloud

LTGCCCG Lightning Cloud to Cloud Cloud to Ground

LTGCG Lightning Cloud to Ground

LTGCW Lightning Cloud to Water

LTGIC Lightning in Clouds

LTL Little

LTLCG Little Change

LTNG Lightning

LTR Later

LTR Letter

LTT Landline Teletypewriter

LTTR Latter

LV Leaving

LV Light and Variable

LVE Leave or leaving

LVG Leaving

LVL Level

LVLOF Level Off

LWR Lower

LX Low Index

LYR Layer or layered or layers

M

M In RVR indicates visibility less than lowest reportable sensor value (e.g. M600)

M In temperature field means “minus” or below zero

M Mach number

M Maritime (air mass)

M Metres (preceded by figures)

M Missing (weather reports only)

M Mountain Standard Time (time groups only)

MA Map Analysis

MAA Maximum Authorized (IFR) Altitude

MAC Military Airlift Command

MACH MACH Number (speed ratio to speed of sound)

MACKAY Mackay Radio and Telegraph Company

MACVFR Make Altitude Changes VFR

MAFAP Minimum Altitude over Facility on Final Approach Course

MAG Magnetic

MAGSI Minimum Altitude at Glide Slope Intersection Inbound

MAINT Maintenance

MAL Maintain at Least (altitude)

MALS Medium-Intensity Approach Lighting System

MALSF Medium-Intensity Approach Light System with Sequenced Flashers

MALSR Medium-Intensity Approach Lighting System With Runway Alignment Indicator

MAM Maintenance Assumes Monitor

MAN Manitoba

MAN Manual

MANAM Manual Amendment

MANOP Manual of Operations

MAP Aeronautical Maps and Charts

MAP Missed Approach Point

MAPS Meteorological Aeronautical Presentation System

MAPT Missed Approach Point

MAR At sea

MARPT Municipal Airport

MARSA Military Assumes Responsibility for Separation of Aircraft

MAS Manual A1 Simplex

MAS Military Alert System

MAX Maximum

MB Marker Beacon

MB Millibars

MCA Minimum Crossing Altitude

MCAS Marine Corps Air Station

MCAS(H) Marine Corps Air Station (Helicopter)

MCK Maintenance Check

MCS Master Control Station

MCW Modulated Continuous Wave

MCZNE Minimum When Control Zone Effective

MDA Minimum Descent Altitude

MDF Medium Frequency Direction Finding Station

MDFR Make Descent From

MDFY Modify

MDH Minimum Descent Height

MDT Moderate

MDZ Modernize

MDZN Modernization

MEA Minimum En Route Altitude

MECH Mechanic

MED Medical

MED Medium

MEDEVAC Medical Emergency Evacuation

MEGG Merging

MEHT Minimum Eye Height Over Threshold

MEML Memorial

MET Meteorological aviation routine weather report

METOF Meteorological Officer

METRO Metropolitan

MEX Mexico

MF Medium Frequency

MFL Maintain Flight Level

MFOB Minimum Fuel on Board

MFPOF Master Flight Plan on File

MFS Military Flight Service

MFV Forward visibility more than (miles)

MFXT Meter Fix Time

MGAT Make Good a Track of (degrees)

MGMT Make Good a Magnetic Track of (degrees)

MGMT Management

MGR Manager

MHA Minimum Holding Altitude

MHDF Medium and High Frequency Direction Finding Station

MHDG Magnetic Heading

MHFR Military Height Finder Radar

MHKVLY Mohawk Valley

MHVDF Medium High and Very High Frequency Direction Finding Station

MHz Megahertz

MI Manufacturing Inspector

MI Mile

MI Shallow

MID Middle

MID Midpoint (related to RVR)

MID/ASIA Middle East/Asia Region

MIDIZ MidCanada Identification Zone

MIDN Midnight

MIDPT Midpoint

MIFG Patches of shallow fog not deeper than two meters

MIJI Meaconing Intrusion Jamming Interference

MIL Military

MIMNO Mimeographic Notice

MIN Minute

MINIT Minutes in Trail

MIREQ Minimum Requirements Specified

MIRL Medium Intensity Runway Edge Lights

MIS Missing

MISC Miscellaneous

MISG Missing

MISL Missile

MIT Miles in Trail

MITO Minimum Interval Takeoff

MKCT Make Check Turn

MKD Marked

MKR Marker

MKR Marker Radio Beacon

MLS Microwave Landing System

MLTLVL Melting Level

MM Middle Marker

MM Millimeter

MMACH Maintain Mach

MMO Main Meteorological Office

MNLD Mainland

MNLY Mainly

MNM Minimum

MNPS Minimum Navigation Performance Specification

MNPSA Minimum Navigation Performance Specification Airspace

MNT Monitor

MNTN Maintain

MNVR Maneuver

MOA Memorandum of Agreement

MOA Military Operations Area

MOC Minimum Obstacle Clearance

MOCA Minimum Obstruction Clearance Altitude

MOD Moderate

MOD Modulate or modulation or modulator

MOGR Moderate or Greater

MON Above mountains

MONOK Monitor resumed normal operation

MONOS Monitor out of service

MONTR Monitor

MOPS Minimum Operational Performance Standards

MOPTAR Multiobject Phase Tracking and Ranging

MOREPS Monitor Station Reports

MOT Ministry of Transport (Canada)

MOTNE Meteorological Operational Telecommunications Network Europe

MOV Move

MPH Miles Per Hour

MPP Merit Promotion Program

MPS Meters Per Second

MPVA Maintain a Position VFR and Advise

MRA Minimum Reception Altitude

MRG Medium Range

MRGL Marginal

MRM Maintenance Returns Monitor

MRNG Morning

MRP ATS/MET Reporting Point

MRR Mechanical Reliability Report

MRTM Maritime

MRU Military Radar Unit

MS Minus

MSA Minimum Safe/sector Altitude

MSAW Minimum Safe Altitude Warning

MSG Message

MSGCTR Message Center

MSL Mean Sea Level

MSR Message (transmission identification) has been misrouted

MSSR Monopulse Secondary Surveillance Radar

MSTLY Mostly

MSTR Moisture

MT Mountain

MTCA Minimum Terrain Clearance Altitude

MTI Moving Target Indicator

MTN Mountain

MTR Military Training Route

MTRL Material

MTRY Momentary

MTU Metric Units

MTW Mountain Wave

MU Friction value representing runway surface conditions

MUA Maximum Usable Altitude

MUF Maximum Usable Frequency

MULT Multiple

MUNI Municipal

MV Millivolt

MVA Minimum Vector Altitude

MVDF Medium and very high frequency direction finding station

MVFR Maintain VFR

MVFR Marginal VFR

MVSP Maintain Visual Separation

MWO Meteorological Watch Office

MWRC Maintain Well to Right of Course

MWTCS Modernized Weather Teletypewriter Communications System

MXD Mixed

N

N North or northern latitude

N/A Not Applicable

NA National Air Traffic Controllers Association

NA Not Authorized

NAAS Naval Auxiliary Air Station

NAATS National Association of Air Traffic Control Specialists

NAB Not Above

NACOS National Communications Schedule

NADIN National Airspace Data Interchange Network

NAF Naval Air Facility

NAFEC National Aviation Facilities Experimental Center

NANAC National Aircraft Noise Abatement Council

NAP Not at Present

NAPRS National Airspace Performance Reporting System

NAR North American Route

NAR Not According to Routine

NAS National Airspace System

NAS Naval Air Station

NAS Navigation and Collision Avoidance System

NASA National Aeronautics and Space Administration

NASC National AIS System Centre

NASEO National Airways System Engineering Office

NASP National Airport System Plan

NAT North Atlantic

NAT Not ARTS tracked

NATL National

NATR No Additional Traffic Reported

NATS Noise Abatement Test System

NAV Navigation

NAVAID Navigational Aid

NAVLO Navy Liaison Officer

NAVREP Navy Representative

NB New Brunswick

NB Northbound

NBCAP National Beacon Code Allocation Plan

NBFR Not Before

NBND Northbound

NBRHD Neighborhood

NC National Air Transport Coordinating Committee

NC No Change

NCDC National Climatic Data Center

NCE No Change in Estimates

NCS National Communications System

NCWX No Change in Weather

NDB Nondirectional Radio Beacon

NDB/DME NDB and DME (collocated)

NDBLO Not to Descend Below

NE Northeast

NEB Northeastbound

NEC Necessary

NEF No Further Clearance Required

NEG Negative

NELY Northeasterly

NERN Northeastern

NESS National Environmental Satellite Service

NETR No Essential Traffic Reported

NEW ENG New England

NFDC National Flight Data Center

NFDD National Flight Data Digest

NFLD Newfoundland

NFQ Night Frequency

NFT No Filing Time

NFU Not For Us

NG National Guard

NGT Night

NHD Not Heard

NICS National Airspace System Interfacility Communications System

NIL None

NIL Unable to transmit

NIS Not in System

NL No Layers

NLT Not Later Than

NM Nautical Mile

NMBR Number

NMC National Meteorological Center

NML Normal

NMN No Middle Name

NMR Nautical Mile Radius

NMRS Numerous

NNE North North East

NNERN North North Eastern

NNEWD North North Eastward

NNW North North west

NNWRN North North Western

NNWWD North Westward

NO Not available

NOAA National Oceanic and Atmospheric Administration

NOAC No Action Necessary

NOF NOTAM Office

NOFIN No Further Information

NOHOL Not Holding

NOIFN No Information

NOM National Communications Center

NOMAD Naval Oceanographic Meteorological Automatic Device

NONEG Negative replies not required

NONRVSM Non-RVSM Capable Flight

NOPAC North Pacific

NOPAR Do not pass to Air Defense radar

NOPT No Procedure Turn Required

NORAC No Radio Contact

NORAD North American Aerospace Defense Command

NORDO No Radio

NOREC No Record

NOREP No Report

NORIV No Arrival Report

NORPI No pilot balloon observation will be filed next collection unless weather changes significantly

NORR No Reply Received

NORST No Restrictions

NOS National Ocean Service

NOSI now Simultaneous

NOSIG No Significant Change

NOSPL No Special Observations Taken (weather reports only)

NOSUM NOTAM Summary

NOTAM Notice to Air Missions

NOTAM Notice to Airmen (No longer used)

NOZ Normal operating zone

NPI Nonprecision Instrument

NPRL No Parallel Traffic

NPRM Notice of Proposed Rulemaking

NPRS Nonpersistent

NR Near

NR Number

NRAB Naval Reserve Air Base

NRD No Record of Destination

NRH No Reply Heard

NRP North American Route Program

NRV Nonrevenue

NRW Narrow

NS Nimbostratus

NS Nova Scotia

NSC No Significant Clouds

NSC Nonstandard C/A Code

NSCSWD No Small Craft or Storm Warning are Being Displayed

NSP Nonstandard Holding Pattern

NSSFC National Severe Storm Forecast Center

NSTP Nonstop

NSW No Significant Weather

NTAP National Track Analysis Program

NTAP Notices To Airmen Publication

NTE Not to Exceed

NTFND No Trouble Found

NTFY Notify

NTL National

NTO Name to

NTRP No Traffic Reported

NTSB National Transportation Safety Board

NTZ No Transgression Zone

NUDET Nuclear Detonation

NVA Negative Vorticity Advection

NW Northwest

NWB Northwestbound

NWLY Northwesterly

NWRN Northwestern

NWS National Weather Service

NWSO Naval Weather Service Office

NXT Next

O

O/F On File

O/R On Request

O/T Overtime

OA Overhead Approach

OAC Oceanic Area Control

OAG Official Airline Guide

OANDR Operation and Regulation

OAOI On and Off Instruments

OARTS Oceanic Air Route Tracking System

OAS Obstacle Assessment Surface

OAT Outside Air Temperature

OB On Board

OBL Obliterate

OBND Outbound

OBS Observation

OBSC Obscure obscured or obscuring

OBST Obstacle

OBST Obstruct

OBSTN Obstruction

OC Obstruction Chart

OC On Course

OCA Obstacle Clearance Altitude

OCA Oceanic Control Area

OCAC Oceanic

OCAS Out of Controlled Airspace

OCFNT Occluded Front

OCH Obstacle Clearance Height

OCL Obstacle Clearance Limit

OCLD Occlude

OCLN Occlusion

OCNL Occasional

OCR Occur

OCS Obstacle clearance surface

OCTLA Out of Control Area

ODALS Omnidirectional Approach Lighting System

ODAPS Oceanic Display and Planning System

OFAS Overseas Flight Assistance Service

OFC Office

OFFL Official

OFM Out For Maintenance

OFP Occluded Frontal Passage

OFP Original Flight Plan

OFSHR Offshore

OFW Off Watch

OFXT Outer Fix Time

OFZ Obstacle free zone

OG On Ground

OGN Originate

OHD Overhead

OI On Instruments

OINT Omni Intersection

OIS Operational Information System

OJT On The Job Training

OK Operating Normally

OK We agree or it is correct

OLDI On Line Data Interchange

OLS Optical Landing System

OM Outer Marker

OMSG Our Message

OMTNS Over Mountains

ONER Oceanic Navigational Error Report

ONSHR On Shore

ONT Ontario

ONW On Watch

OOT Out of Tolerance

OPA Opaque white type of ice formation

OPC Operational Control

OPDT Opposite Direction Traffic

OPER Operate

OPMET Operational Meteorological (information)

OPN Open

OPN Operation

OPNML Operations Normal

OPR Operate Operator Operational

OPS Operations

OPSNET Operations Network

ORD Order

ORGPHC Orographic

ORIG Original

ORL Overrun Lights

ORS Over Range Station

OSV Ocean Station Vessel

OT Oral Notice

OT On Time

OTAS On Top and Smooth

OTFC Overflight Traffic

OTLK Outlook

OTP On Top

OTR Other

OTRW Otherwise

OTS Organized Track System

OTS Out of Service

OUBD Outbound

OV Location (PIREP only)

OVC Overcast

OVD Overdue

OVHD Overhead

OVLA Overlay

OVNGT Overnight

OVR Over

OVRN Overrun

OVSEA Overseas

OVTK Overtake

OW One Way

OWF Optimum Working Frequency

OXY Oxygen

P

P In RVR indicates visibility greater than highest reportable sensor value

P Pacific Standard Time

P Polar (air mass)

P Precision approach terrain chart

P Prohibited Area

P/CG Pilot Controller Glossary

P6SM Visibility greater than 6 SM (TAF only)

PA Precision Approach

PA Pressure Altitude

PAC Pacific

PACF Parent FSS assumes control of part time FSS

PADRA Pass to Air Defense Radar

PAEW Personnel and Equipment Working

PAJA Parachute Jumping Activities

PALS Precision Approach Lighting System

PALT Present Altitude

PANS Procedures for Air Navigation Services

PAP ProAirPilot

PAPI Precision Approach Path Indicator

PAR Precision Approach Radar

PARA Paragraph

PAREN Parenthesis

PARL Parallel

PARROT Position Adjustable Range Reference Orientation Transponder

PAT Pattern

PATWAS Pilots Automatic Telephone Weather Answering Service

PAU Present Address Unknown

PAX Passenger

PBCT Proposed Boundary Crossing Time

PBL Probable

PBS Public Buildings Service

PCA Positive Control Area

PCD Proceed

PCK Pilot Check

PCL Pilot Controlled Lighting

PCN Pavement Classification Number

PCPN Precipitation

PCS Permanent Change of Station

PD Period

PDAR Preferential Arrival/Departure Route

PDC Predeparture Clearance

PDDC Proceed Directly on Course

PDMT Predominant

PDMT Predominate

PDOP Position Dilution of Precision

PDR Preferential Departure Route (Stage A)

PDW Priority Delayed Weather

PEN Peninsula

PENT Penetrate or penetration

PER Performance

PERCOM Peripheral Communications

PERF Perforator

PERM Permanent

PFSV Pilot to Forecaster Service

PGTSND Puget Sound

PHYS Physical

PIB Preflight Information Bulletin

PIBAL Pilot Balloon Observation

PIC Pilot in Command

PIR Precision Instrument Runway

PIREP Pilot Weather Report

PIRFC Pilot Requests Forecast

PISE No pilot balloon observation due to unfavorable sea conditions

PISO No pilot balloon observation due to snow

PIT Pilot Instructor Training

PIWI No pilot balloon observation due to high, or gusty, surface wind

PJE Parachute Jumping Exercise

PK WND Peak Wind

PL Ice Pellets

PLA Practice Low Approach

PLASI Pulsating Visual Approach Slope Indicators

PLAT Present Latitude

PLF Private Line Telephone

PLN Flight Plan

PLOB Place of Birth

PLONG Present Longitude

PLS Please

PLT Private Line Teletypewriter

PLVL Present Level

PLW Plow (snow)

PM Post Meridiem

PMSN Permission

PMT Permit

PN Prior Notice Required

PNHDL Panhandle

PNR Point of No Return

PO Dust Devils

PO Post Office

PO Purchase Order

POA Privately Owned Aircraft

POB Persons On Board

POC Proceed or Proceeding On Course

POS Positive

POSS Possible

POV Privately Owned Vehicle

PP Pay Period (number)

PPI Plan Position Indicator

PPINA Radar weather report not available (or omitted for a reason different than those otherwise stated)

PPINE Radar weather report no echoes observed

PPINO Radar weather report equipment inoperative due to breakdown

PPIOK Radar weather report equipment operation resumed

PPIOM Radar weather report equipment inoperative due to maintenance

PPR Prior Permission Required

PPS Propose

PPSN Present Position

PR Partial

PR Photo Reconnaissance

PRBL Probable

PRBLTY Probability

PRBO Position Relief Briefing Observed

PRCF Parent FSS returns control of part time FSS

PRCHT Parachute

PRCTN Precaution

PRECD Precede

PREF Preferred

PRES Pressure

PRESFR Pressure Falling Rapidly

PRESRR Pressure Rising Rapidly

PREV Previous

PRFG Fog Partial

PRI Primary

PRIM Primary

PRIN Principal

PRIND Present Indications Are

PRIRA Primary Radar

PRJMP Pressure Jump (weather reports only)

PRKG Parking

PRN Pseudo Random Noise

PROB Probability

PROB30 Probability 30 Percent

PROB40 Probability 40 Percent

PROC Procedure

PROCD Proceed

PROG Prognosis or prognostic

PROG Progress

PROP Propeller

PROPA Propagation

PROSIG Procedure Signal

PROV Provisional

PRP Prepare

PRSNT Present

PRST Persist

PRVD Provide

PS Passenger Service

PS Plus

PSBL Possible

PSBT Pilot Self Briefing Terminal

PSG Passage

PSG Passing

PSGR Passenger

PSN Position

PSNAL Personal

PSNL Personnel

PSNRP Position Report

PSP Pierced Steel Planking

PSR Packed Snow on Runway

PSR Primary Surveillance radar

PSRI Position Subject to Return of Incumbent

PSRS Position Subject to Rotating Shifts

PST Pacific Standard Time

PT Procedure Turn

PTC Plan to Clear

PTC Positive Target Control

PTCHY Pitchy

PTCP Participate

PTLY Partly

PTN Portion

PTN Procedure Turn

PTP Point To Point

PTR Printer

PTS Polar Track Structure

PUB Public

PUBL Publish

PUP Pickup

PVA Positive Vorticity Advection

PVASI Pulsating Visual Approach Slope Indicator

PVL Prevail

PVLT Prevalent

PVT Private

PWB Pilot Weather Briefing

PWI Proximity Warning Indicator

PWINO Precipitation identifier information not available (weather reports only)

PWR Power

PWRNO Power Failure

PWROK Power Restored

PY Spray

Q

QDL Question asking for a series of bearings typically used in ICAO

QDM Magnetic Heading

QDR Magnetic Bearing

QFE Atmospheric pressure at airport elevation

QFLOW Quota Flow Control Procedures

QFU Magnetic orientation of runway

QJH Shall I run my test tape/a test sentence

QLFY Qualify

QLTY Quality

QN Question

QNH Altimeter subscale setting to obtain elevation when on the ground

QNTY Quantity

QSP Question asking for free of charge relay in ICAO

QSTNRY Quasi Stationary

QTA Shall I cancel telegram number?

QTE True bearing

QTR Quarter

QUAD Quadrant

QUE Quebec

QUJ Questions asking for TRUE track in degrees and time in ICAO

R

R Acknowledgment of receipt (message handling)

R Received (acknowledgment of receipt)

R Restricted area (followed by identification)

R Right (runway identification)

R Runway (used in RVR measurement)

R/O Receive Only

R/OC Receive Only Centers

RA Rain

RAA Remote Airport Advisory

RAAF Royal Australian Air Force

RABA No RAWIN observation no balloons available

RABAL Radiosonde balloon wind data

RABAR Radiosonde balloon release

RAC Request Altitude Change

RAC Rules of the Air and Air Traffic Services

RACE Request Altitude Changes En Route

RACFI Radio and Communication Facilities Inoperative

RACO No RAWIN Observation Communications Out

RACON Radar Responder Beacon

RADAT Radiosonde Observation Data

RADEP Radar Departure

RADNO Report missing account radio failure

RADON Radar Beacon

RADU Weather Radar Analysis and Development Unit

RAF Royal Air Force

RAFC Regional Area Forecast Center

RAFI Radiosonde Observation Not Filed

RAFRZ Radiosonde Observation Freezing Levels

RAG Ragged

RAG Runway Arresting Gear

RAGF Remote Air Ground Facility

RAHE No RAWIN observation no gas available

RAI Runway Alignment Indicator

RAICG Radiosonde Observation Icing At

RAIL Runway Alignment Indicator Lights

RAIM Receiver Autonomous Integrity Monitoring

RAJAM Radar Jamming

RALT Regardless of Altitude

RAM Returned Account Mechanical

RAOB Radiosonde Observation

RAPCON Radar Approach Control

RAPI Radiosonde report already sent in

RARAD Radar Advisory

RAREP Radar Weather Report

RASC Regional AIS System Centre

RASH Rain Showers

RASN Rain and snow or showers of rain and snow

RAVU Radiosonde Analysis and Verification Unit

RAWE No RAWIN observations unfavorable weather

RAWI No RAWIN observations high and gusty winds

RAWIN Upper winds observation (by radio methods)

RAWX Returned Account Weather

RB Rescue Boat

RB Right Base

RBDE Radar Bright Display Equipment

RBN Radio Beacon

RBOC Report Back on Course

RBOF Report Back on Frequency

RBS PP (RBS) Ration by schedule plus compression

RBS Radar Bomb Scoring

RC Reverse Course

RC Road Reconnaissance

RCA Reach Cruising Altitude

RCADV Reverse Course and Advise

RCAG Remote Communications Air Ground Facility

RCALT Reach Cruising Altitude

RCC Rescue Coordination Center

RCD Radar Cloud Detection Report

RCDNA Radar Cloud Detection Report Not Available

RCDNE Radar Cloud Detection Report No Echoes Observed

RCDNO Radar cloud detector inoperative due to breakdown until

RCDOM Radar cloud detector inoperative due to maintenance until

RCF Radio Communication Failure

RCF Remain on Company Frequency

RCH Reach

RCK Radio Check

RCKY Rockies (mountains)

RCL Runway Center Line

RCLL Runway Center Line Lights

RCLM Runway Centerline Marking

RCLR Radio Communications Link Repeater

RCLS Runway Centerline Light System

RCLT Radio Communications Link Terminal

RCMD Recommend

RCN Royal Canadian Navy

RCO Remote Communication Outlet

RCOM En Route Communications

RCON Reconfiguration

RCPT Receipt

RCR Runway Condition Reading

RCRD Record

RCS Rehost Computer System

RCV Receive

RCVNO Receiving Capability Out

RDARA Regional and Domestic Air Route Area

RDAT Radar Data

RDC Reduce

RDG Ridge

RDH Reference Datum Height (ILS)

RDL Radial

RDO Radio

RDS Radius

RDSP Redispatch

RDSPA Redispatch Accepted

RDWND Radar Dome Wind

RE Regard

REC Receive or receiver

RECLR Recleared

RECON Reconnaissance

RECON Reference Conversation

REDL Runway Edge Light

REF Reference

REFONE Reference our telephone conversation

REFORM Reference Form

REG Registration

REG Regulation

REGAL Range and Elevation Guidance for Approach and Landing

REIB Report Established in Block

REIL Runway End Identifier Lights

REINV Reference Invoice

RELBL Reliable

RELCT Relocate

RELET Reference Letter

REMES Reference Message

REMT Relief Electronic Maintenance Technician

RENL Runway End Light

RENOT Regional Office Notice

REOC Report When Established On Course

REP Report or reporting point

REP Represent or representative

REP Research Project

REPAML Reply By Airmail

REPBS Reference PBS message

REPERF Reperforator

REPMES Reply By Message

REPML Reply By Mail

REPTWX Reply By TWX

REQ Request

REQID Request If Desired

REQON Request Consideration

REQRCM Request Your Recommendation

REQSTD Requested

RERTE Reroute

RES Reserve

RES Resident

RESA Runway End Safety Area

RESP Response

RESTR Restrict

REWRC Report When Established Well to Right of Course

RF Radar Facility

RF Radio Frequency

RF Reception Fair

RFA Request Further Airways

RFI Radio Frequency Interference

RFI Ready For Issue

RFL Refuel

RFS Refuse

RFTO Ready For Takeoff

RG Range (lights)

RG Reception good

RGD Ragged

RGLR Regular

RGN Region

RH Relative Humidity

RHC Right Hand Circuit

RHI Range Height Indicator

RHINO Radar Echo Height Information Not Available

RHINO Radar Range Height Indicator Not Operating on Scan

RIF Reclearance In Flight

RIF Reduction In Force

RIMAT Must Ride Company Material

RIOGD Rio Grande

RIS Reports Identification Symbol

RITC Request in Trail Climb

RITD Request in Trail Descent

RITE Right (direction of turn)

RL Report immediately upon leaving

RL Report Leaving

RLA Relay To

RLANO Relay equipment out of operation

RLAOK Relay equipment resumed operation

RLBG Relative Bearing

RLC Report Landing Completed

RLCE Request Level Change En Route

RLETFL Report Leaving Each Thousand Foot Level

RLLS Runway Leading Lighting System

RLNA Request Level Not Available

RLS Release

RLSTN Relay Station

RLTK Rhumbline Track

RLTV Relative

RLV Relieve

RLVL Report Level

RM Remarks

RMK Remark

RMLR Radar Microwave Link Repeater

RMLT Radar Microwave Link Terminal

RMN Remain

RMPCK Ramp Check

RMRK Remark

RN Reception Nil

RNAV Area Navigation

RNFL Rainfall

RNG Army National Guard

RNG Radio Range

RNLS Resume Normal Speed

RNP Required Navigation Performance

RO Regional Office

RO Regulated Output

ROBEPS Radar Operating Below Prescribed Standard

ROBEX Regional OPMET Bulletin Exchange

ROC Rate of Climb

ROCC NORAD Region Operations Control Center

ROD Rate of Descent

RODA Regardless of Destination Airport

ROFOR Route Forecast

ROLET Reference Letter from our office

ROMEMO Reference Our Memorandum

ROMES Reference Message from our office

RON Remaining Overnight

ROPBS Reference PBS message from our office

RORQN Reference requisition from our office

RORU Rest Of Route Unchanged

ROT Rotate

ROTEL Reference telegram from our office

ROTG Rotating

ROTWX Reference our TWX

ROV Report Over

RP Reception Poor (radio logs only)

RP Right Traffic Pattern

RPA Request Present Altitude

RPD Rapid

RPFOD Reported For Duty

RPI Radar Position Indicator

RPL Repetitive Flight Plan

RPLC Replace

RPM Rotation Per Minute

RPOC Report Proceeding On Course

RPR Repair

RPRT Report

RPS Radar Position Symbol

RPSG Report Passing

RPT Repeat

RPT Repeat or I repeat

RQ Indication of a request

RQ Request

RQCL Request Clearance

RQDCZ Request Clearance to Depart VFR and Leave Control Zone at

RQECZ Request Clearance to Enter Control Zone VFR at

RQMNTS Requirements

RQN Requisition

RQOF Request on File

RQP Request Flight Plan

RQP Request Permission

RQPP Request Present Position

RQR Require

RQRP Request Reply

RQS Request Supplementary Flight Plan

RQTAO Request Time and Altitude Over

RR Low or medium frequency radio range stations

RR Radar Range Station

RR Report immediately upon reaching

RR Report Reaching

RRBN Round Robin

RRCVR Remote Receiver

RRL Runway Remaining Lights

RRP Runway Reference Point

RRPD Runway Reference Point Downwind

RRPU Runway Reference Point Upwind

RRS Remainder of Same Route

RRTE Reroute

RS Receiver Station

RS Record Special Observation (weather reports only)

RS Right Side

RSC Rescue Subcenter

RSCD Runway Surface Condition

RSCU Rescue

RSG Rising

RSN Reason

RSOPN Resumed Operation

RSP Responder Beacon

RSR En Route Surveillance Radar

RSTR Restrict

RSU Runway Supervisory Unit

RSVN Reservation

RT Right turn after takeoff

RT Round Trip

RTB Return To Base

RTD Delayed

RTE Route

RTF Radiotelephone

RTG Radiotelegraph

RTHL Runway Threshold Light

RTMTR Remote Transmitter

RTN Return

RTND Retained

RTNE Routine

RTO Report Time Over

RTR Remote Transmitter/Receiver

RTR Returning To Ramp

RTRD Retard

RTRN Return

RTS Return To Service

RTT Radio Teletypewriter

RTX Report time crossing

RTZL Runway Touchdown Zone Light

RUF Rough

RUFORM Reference your form

RULET Reference letter from your office

RUMEMO Reference your memorandum

RUMES Reference message from your office

RURQN Reference requisition from your office

RUT Standard regional route transmitting frequencies

RUTEL Reference telegram from your office

RUTWX Reference your TWX

RV Radar Vector

RV Rescue Vessel

RVO Runway Visibility by Observer

RVR Runway Visual Range

RVRA Runway Visual Range (RVR) ten minute average

RVRANO Runway Visual Range (RVR) ten minute average not available

RVRENO Runway Visual Range (RVR) ten minute extremes not available

RVRM Runway Visual Range (RVR) midpoint

RVRMNO Runway Visual Range (RVR) midpoint not available

RVRNO Runway Visual Range (RVR) not available

RVRR Runway Visual Range (RVR) rollout

RVRRNO Runway Visual Range (RVR) rollout not available

RVRT Runway Visual Range (RVR) touchdown

RVRTNO Runway Visual Range (RVR) touchdown not available

RVS Revise

RVV Runway Visibility Value

RVSM Reduced Vertical Separation Minimums

RVVNO RVV not available

RWRC Remain Well to Right of Course

RWY Runway

RY Runway

S

S South or southern latitude

S/A Semiannual

S/RC Send/Receive Center

SA Duststorm, sandstorm, rising dust or sand

SA Record Observation (weather reports only)

SA Sandstorm or dusting

SA Surveillance Approach

SABH Simultaneous Automatic Broadcast Homer

SADT Same Direction Traffic

SAFI Semiautomatic Flight Inspection

SAFI Semiautomatic Flight Inspection Aircraft

SALS Short Approach Lighting System

SALS Simple Approach Lighting System

SALSF Short Approach Lighting System with Sequenced Flashing Lights

SAN Sanitary

SAO Surface Aviation Observation

SAP Soon As Possible

SAPD Speed at Pilots Discretion

SAR Search and Rescue

SARPS Standards and Recommended Practices

SASK Saskhewan

SATFY Satisfy or satisfactory

SATR So As To Reach

SAVASI Simplified Abbreviated Visual Approach Slope Indicator

SAWRS Supplementary Aviation Weather Reporting Station

SAYTA Say Time Able

SB Southbound

SBAS Satellite-Based Augmentation System

SBFC Standby For Further Clearance

SBND Southbound

SBSD Subside

SC Stratocumulus

SCAN Self Correcting Automatic Navigation

SCANO Automatic Scanning Unit Out of Service

SCAOK Automatic Scanning Unit Returned to Service

SCAT Security Control of Air Traffic

SCATANA Security Control of Air Traffic and Air Navigation Aids

SCC System Command Center

SCLN Semicolon

SCND Second (in line)

SCS Single Channel Simplex

SCSL Standing Lenticular Stratocumulus

SCT Scattered

SCTR Sector

SCTY Security

SDB Scheduled Data Base

SDBY Standby

SDF Simplified Directional Facility

SE Southeast

SE System Engineer

SEADRM Seadrome

SEB South Eastbound

SEC Second (time)

SECMR Sector Manager

SECRA Secondary Radar

SECT Sector

SEL Space Environment Laboratory

SELCAL Selective Calling

SELS Severe Local Storms

SELY South Easterly (weather reports only)

SENS Sensitivity

SEPN Separation

SEQ Sequence

SER Service

SERN South Eastern

SES Supervisory Electronics Specialist

SESC Space Environment Service Center

SET Stack Entry Time

SEV Severe

SF Standard Form

SFA Single Frequency Approach

SFC Surface

SFERICS Atmospherics

SFL Sequence Flashing Lights

SFO Sector Field Office

SFO Simulated Flame Out

SFPP Stored Flight Plan Program

SFU Sector Field Unit

SG Snow Grains (weather reports only)

SGD Signed

SGD Solar Geophysical Data

SGFNT Significant

SGL Signal

SH Showers

SHF Super High Frequency

SHFT Shift

SHGR Hail Showers

SHGS Hail Showers (small)

SHLW Shallow

SHORN Short Range Navigation System

SHP Standard Holding Procedure

SHPL Ice Pellet Showers

SHRA Rain Showers

SHRT Short

SHRTLY Shortly

SHRTWV Shortwave

SHSN Snow Showers

SHTDN Shutdown

SHUD Should

SHWR Shower

SI Straight In Approach

SIA Standard Instrument Approach

SIAP Standard Instrument Approach Procedure

SID Standard Instrument Departure

SIERNEV Sierra Nevada

SIF Selective Identification Feature

SIG Signature

SIGMET Significant Meteorological Information

SIGWX Significant Weather

SIM Simulated Approach

SIMUL Simultaneous

SIR Snow and Ice on Runway

SIWL Single Isolated Wheel Load

SJP Standard Jet Penetration

SK Sky condition

SKC Sky clear

SKED Schedule

SL Sea Level

SL Sick Leave

SLCT Select

SLD Solid

SLGT Slight

SLMM Simultaneous Compass Locator at Middle Marker

SLO Slow

SLOM Simultaneous Compass Locator at Outer Marker

SLP Sea Level Pressure

SLP Slope

SLP Speed Limiting Point

SLR Slush on Runway

SLRAP Standard Low Frequency Range Approach

SLS Side Lobe Suppression

SLT Sleet

SLW Slow

SM Statute Mile

SMC Squawk Mode Code

SMC Surface Movement Control

SML Small

SMR Statute Mile Radius

SMR Surface Movement Radar

SMRY Summary

SMS Synchronous Meteorological Satellite

SMS Systems Maintenance Sector

SMT Submit

SMTH Smooth

SMTM Sometime

SMWHT Somewhat

SN Snow

SN Strategic Navigation

SN Systems Navigation

SNBNK Snowbank

SND Sand or sanded or sanding

SNFLK Snowflake

SNGL Single

SNOINCR Snow depth increase in past hour

SNOWTAM NOTAM reporting the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush or ice on the movement area

SNSH Snow Showers

SNW Snow

SNWFL Snowfall

SOAP Spectrometric Oil Analysis Program

SOB Souls On Board

SOCC NORAD Sector Operations Control Center

SOM Satellite Communication

SOMSG See Our Message

SOP Standard Operating Procedure

SORAP Standard Omni Range Approach

SP Standard Holding Pattern

SP Station Pressure

SPAN Stored Program for Alpha Numerics

SPB Seaplane Base

SPCLY Especially

SPD Speed

SPEC Specification

SPECI Aviation selected special weather report

SPKL Sprinkle

SPL Special

SPL Supplementary Flight Plan

SPLNS South Plains

SPO Strategic Plan of Operation

SPOT Spot Wind

SPRD Spread

SPRL Spiral

SPS Standard Positioning Service

SPT Strategic Planning Team

SQ Squall

SQDN Squadron

SQK Squawk

SQLN Squall Line

SR Standard Range Approach

SR Sunrise

SRA Surveillance Radar Approach

SRCH Search

SRE Surveillance Radar Element of precision approach radar system

SRG Short Range

SRND Surround

SRPN Special Requisition Priority Number

SRR Search and Rescue Region

SRY Secondary

SS Sandstorm

SS Sunset

SSALF Simplified Short Approach Lighting System with Sequenced Flashers

SSALR Simplified Short Approach Lighting System with Runway Alignment Indicator Lights

SSALS Simplified Short Approach Lighting System

SSB Single Side Band

SSE South South East

SSERN South South Eastern

SSEWD South South Eastward

SSNO Request no SIDs or STARs

SSR Secondary Surveillance Radar

SST Supersonic Transport

SSW South South West

SSWRN South South Western

SSWWD South South Westward

ST Saint

ST Stratus

STA Straight In Approach

STADMR Station Administrator

STAGN Stagnation

STALO Stabilized Local Oscillator

STAR Standard Terminal Arrival

STATE Military, customs, or police services

STBL Stable

STCLB Start Climb

STD Standard

STDST Start Descent

STDY Steady

STF Stratiform

STFRA Stratus Fractus

STFRM Stratiform

STG Strong

STLT Satellite

STM Storm

STMGR Station Manager

STMP Special Traffic Management Program

STN Station

STNR Stationary

STNRY Stationary

STOL Short Takeoff and Landing

STR Subject Terminal Control Release

STRO Stereo Routes

STS Status

STWL Stopway Light

STWY Stopway

SUA Special Use Airspace

SUB Substitute

SUBFIX Subject to Correction

SUBJ Subject to

SUF Sufficient

SUG Suggest

SUP Supply

SUPCHG Supercharge

SUPPL Supplement

SUPPS Regional Supplementary Procedures

SUPR Superior

SUPSD Supersede

SUPT Superintendent

SUPVR Supervisor

SURPIC Surface Picture

SUSP Suspend

SVC Service

SVCBL Serviceable

SVFR Special VFR

SVG Serving

SVN Space Vehicle Number

SVR Severe

SVRL Several

SW South West

SWAP Severe Weather Avoidance Plan

SWB Scheduled Weather Broadcast

SWB South Westbound

SWLG Swelling

SWLY South Westerly

SWRN South Western

SWSL Supplemental Weather Wervice Location

SWY Stopway

SX Stability Index

SXN Section

SYD Release Subject Your Discretion

SYNOP Synoptic

SYNS Synopsis

SYS See Your Service

SYS System

T

T Temperature

T Trace (weather reports only)

T Training

T Tropical (air mass)

T True (bearing)

T/R Transportation Request

TA Temperature (PIREP only)

TA Total Aboard

TA Transition Altitude

TAC Terminal Area Chart

TACAN Tactical Air Navigational Aid

TACLO Tactical Air Command Liaison Officer

TACR Tactical Air Navigation

TAD Tower Approach and Departure Control Facility

TAF Terminal Aerodrome Forecast

TAIL Tail Wind

TAND Tandem

TANDA Time and Attendance Report

TAO TACAN only

TAO Time and Altitude Over

TAPER Temporary Appointment Pending Establishment of a Register

TAR Terminal Area Surveillance Radar

TARND Turn Around

TARS Terminal Automated Radar Services

TARS Tethered Aerostat Radar System

TAS True Air Speed

TASR Terminal Area Surveillance Radar

TAWOG Travel Arrangements Without Government Expense

TB Turbulence (PIREP only)

TBJT Turbojet

TC Time Check

TC Tropical Cyclone

TCA Tactical Customer Advocate

TCA Terminal Control Area

TCAS Traffic Alert and Collision Avoidance System

TCH Threshold Crossing Height

TCHD Threshold Crossing Height Downwind

TCHU Threshold Crossing Height Upwind

TCNTL Transcontinental

TCOM Terminal Communications

TCP Transfer of Control Point

TCU Towering Cumulus

TD Touchdown

TD Transmitter Distributor

TDA Today

TDEL Time Delay

TDLS Terminal Data Link System

TDO Tornado

TDOP Time Dilution of Precision

TDWR Terminal Doppler Weather Radar

TDY Temporary Duty

TDZ Touchdown Zone

TDZE Touchdown Zone Elevation

TDZL Touchdown Zone Light (system)

TEC Tower En Route Control

TECA Tower En Route Control Area

TECR Technical Reason

TEL Telecommunications

TEL Telephone

TELAU Teleautograph

TELCO Telephone Company

TELCON Telephone Conference

TELEX Telephone Exchange

TELRY Telegraph Reply

TEMP Temperature

TEMPO Temporary

TEND Trend

TERPS Terminal Instrument Procedures

TET Tetrahedron

TF Terrain Following

TFC Traffic

TFMS Traffic Flow Management System

TFR Temporary Flight Restriction

TFRCD Traffic Received

TFZ Traffic Zone

TGL Touch and Go Landing

TGS Taxiing Guidance System

THD Thunderhead

THDR Thunder

THK Thick

THLD Threshold

THN Thin

THR Threshold

THRFTR Thereafter

THRU Through

THRUT Throughout

THSD Thousand

THTN Threaten

TIBA Traffic Information Broadcast by Aircraft

TIL Until

TINOP Transponder Inoperative

TIP Until Past

TIPS Terminal Information Processing System

TKOF Takeoff

TLM Telemetry

TLRNC Tolerance

TLTP Too Long To Print

TLWD Tailwind

TM Time (PIREP only)

TM Traffic Management

TMA Terminal Control Area

TMPA Traffic Management Program Alert

TMPRY Temporary

TMT Transmit

TMW Tomorrow

TNA Turn Altitude

TNDCY Tendency

TNGT Tonight

TNH Turn Height

TNTV Tentative

TO Travel Order

TOC To Be Continued

TOC Top of Climb

TOD Time of Delivery

TODA Takeoff Distance Available

TOG Takeoff Gross Weight

TOP Cloud top

TOR Time of Receipt

TOR Traffic on Request

TORA Takeoff Run Available

TOT Time of Transmission

TOVC Top of Overcast

TP Turning Point

TP Type Aircraft (PIREP only)

TPA Traffic Pattern Altitude

TPG Topping

TR Track

TR VFR low altitude training routes

TRA Temporary Reserved Airspace

TRACAB Terminal Radar Approach Control in Tower Cab

TRACON Terminal Radar Approach Control Facility

TRAD Terminal Radar

TRAN Transient

TRANS Transmit or transmitter

TRBL Trouble

TRCV Tricolor Visual Approach Slope Indicator

TRG Training

TRIB Tributary

TRK Track

TRLVL Transition Level

TRML Terminal

TRMT Terminate

TRNG Training

TRNSP Transport

TROF Trough

TROP Tropopause

TRPCD Tropical Continental (air mass)

TRPCL Tropical

TRPLYR Trapping Layer

TRRN Terrain

TRSA Terminal Radar Service Area

TRSN Transition

TRTD Treated

TS Team Supervisor

TS Thunderstorm

TSA Transportation Security Administration

TSATLC TransAtlantic

TSEC Terminal Secondary Radar Beacon

TSFR Transfer

TSGR Thunderstorm with Hail

TSGS Thunderstorm with Small Hail

TSMNO Transmitting Capability out of Service

TSMOK Transmitting Capability Returned to Service

TSNO Thunderstorm Information Not Available

TSNT Transient

TSO Technical Standard Order

TSPAC TransPacific

TSPL Thunderstorm with Ice Pellets

TSRA Thunderstorm with Rain

TSSA Thunderstorm with Duststorm or sandstorm

TSSN Thunderstorm with Snow

TSTM Thunderstorm

TT Teletypewriter

TTS Teletype Switching Facilities

TTY Teletypewriter Station

TURB Turbulence

TURBC Turbulence

TURBT Turbulent

TVASIS T Visual Approach Slope Indicator System

TVL Travel

TVOR Terminal VOR

TWD Toward

TWEB Transcribed Weather Broadcast

TWI Twilight

TWR Aerodrome Control Tower

TWR Tower

TWRG Towering

TWS Radar Track While Scan

TWX Teletypewriter Exchange Service

TWY Taxiway

TWYL Taxiway Link

TXG Taxiing

TXL Taxilane

TXT Text

TYP Type Aircraft

TYPH Typhoon

TYPNO Teletypewriter Communications Out of Service

TYPOK Teletypewriter Communications Returned to Service

U

U Intensity Unknown (weather reports only)

U/S Unserviceable

UA Routine PIREP

UA Unable to approve arrival for the time specified

UAB Until Advised By

UAC Upper Area Control Center

UAG Upper Atmosphere Geophysics

UAR Upper Air Route

UAS Unmanned Aircraft Systems

UAT Until Advised by the Tower

UCDWN Until Cleared Down

UCLT Until Cleared to Land by the Tower

UD Unable to approve departure for the time specified

UDDF Up and Down Drafts

UDF Ultra High Frequency Direction Finding Station

UERE User Equivalent Range Error

UFA Until Further Advised

UFN Until Further Notice

UFO Unidentified Flying Object

UHA Unable Higher Altitude

UHDODT Unable Higher Due Opposite Direction Traffic

UHDSDT Unable Higher Due Same Direction Traffic

UHDT Unable Higher Due Traffic

UHDT Unable Higher Due Traffic

UHF Ultra High Frequency

UIC Upper Information Center

UIR Upper Flight Information Region

ULDT Unable Lower Due Traffic

ULR Ultra Long Range

UM Unable to Maintain

UN Unable

UNA Unable

UNAP Unable to Approve

UNAPV Unable to Approve

UNAR Unable to Approve Altitude Requested

UNATNDD Unattended

UNAVBL Unavailable

UNCC Unable to Contact Company Radio

UNDLD Undelivered

UNEC Unnecessary

UNHRD Unheard

UNID Unidentified

UNKN Unknown

UNL Unlimited

UNLGTD Unlighted

UNMON Unable to Monitor

UNMON Unmonitored

UNOFFL Unofficial

UNRDBL Unreadable

UNREL Unreliable

UNRELBL Unreliable

UNRR Unable to Approve Route Requested

UNRSTD Unrestricted

UNSATFY Unsatisfactory

UNSBL Unseasonable

UNSKED Unscheduled

UNSTBL Unstable

UNSTDY Unsteady

UNSTL Unsettle

UNTC Unable to Establish Contact

UNUSBL Unusable

UP Unknown Precipitation

UPDFTS Up Drafts

UPDT Update

UPR Upper

UPSLP Upslope

UPSTRM Upstream

UQOT Unquote

URAUZ You are authorized

URG Urgent

URIZR Your recommendation is requested

U/S Unserviceable

USA U.S. Army

USAF U.S. Air Force

USAFIB U.S. Army Aviation Flight Information

USBL Usable

USCG U.S. Coast Guard

USMC U.S. Marine Corps

USN U.S. Navy

USNO United States Naval Observatory

USNOF United States NOTAM Office

USNS United States NOTAM System

USP Urgent Special Observation (weather reports only)

UTA Upper control area

UTC Coordinated Universal Time

UTCOK Coordinated Universal Time Coordinate Check Completed

UUA Urgent PIREP

UVV Upward Vertical Velocity

UW Upwind

UWNDS Upper Winds

V

V Variable (weather reports only)

VA Victor Airways

VA Volcanic Ash

VAC Visual Approach Chart

VACAPES Virginia Capes

VADA VFR Arrival Delay Advisory

VAL Valleys

VAN Runway control van

VAPS V/STOL Approach System

VAR Magnetic Variation

VAR Visual Aural Radio Range

VARN Variation

VASI Visual Approach Slope Indicator

VASIS Visual Approach Slope Indicator System

VC Vicinity

VCFG Fog in Vicinity

VCNTY Vicinity

VCOT VFR Conditions On Top

VCTR Vector

VDF Very High Frequency Direction Finding Station

VDOP Vertical Dilution of Precision

VDP Visual Descent Point

VER Vertical

VF Maintaining Visual Flight

VFLT Visual Flight

VFPR Via Flight Planned Route

VFR Visual Flight Rules

VFRSA VFR Restrictions Still Apply

VFY Verify

VHF Very High Frequency

VIA By way of

VIP Very Important Person

VIP Visual Integrated Presentation

VIS Visibility

VLCTY Velocity

VLF Very Low Frequency

VLFD Via Low Frequency Direct

VLNT Violent

VLR Very Long Range

VLY Valley

VM Voice Modulation

VMC Visual Meteorological Conditions

VNAV Vertical Navigation

VOD Via Omni Direct

VOL Volume

VOLMET Meteorological information for aircraft in flight

VOPR Voice Operated Relay

VOR Very High Frequency Omnidirectional Range

VOR APPR VOR Approach

VOR/DME Very High Frequency Omnidirectional Range Collocated with Distance Measuring Equipment

VOR/DME VHF Omnidirectional Range/Distance Measuring Equipment

VOR/DME VOR and DME (collocated)

VOROC VOR On Course

VORTAC Very High Frequency Omnidirectional Range Collocated Tactical Air

VORTAC VOR and TACAN (collocated)

VORTAC VOR collocated with TACAN

VOT VOR airborne equipment test facility

VOT VOR Test Facility

VOT VOR Test signal

VOT Vorticity

VOU Voucher

VR Veer

VR VFR military training routes

VRB Variable

VRBL Variable

VRG Visual Reference Gate

VRISL Vancouver Island, BC

VRT MOTN Vertical Motion

VSA By visual reference to the ground

VSB Visible

VSBY Visibility

VSBYDR Visibility Decreasing Rapidly

VSBYIR Visibility Increasing Rapidly

VSL Vessel

VSP Vertical Speed

VSPI Visual Glide path Indicator

VSTOL Vertical/Short Takeoff and Landing

VTOL Vertical Takeoff and Landing

VV Vertical Visibility (indefinite ceiling)

W

W Warm (air mass)

W West or western longitude

W White

WA AIRMET

WAAS Wide Area Augmentation System

WAC World Aeronautical Chart

WAFC World Area Forecast Center

WAIOP Will Accept If Offered the Position

WB Westbound

WBAR Wing Bar Lights

WBND Westbound

WBRBN Will Be Reported by NOTAM

WBRH Weather Bureau Regional Headquarters

WBTS Whereabouts

WCLC Watch Check List Completed

WDC1 World Data Centers in Western Europe

WDC2 World Data Centers throughout rest of world

WDI Wind Direction Indicator

WDLY Widely

WDSPR Widespread

WDSPRD Widespread

WEA Weather

WEF With Effect From

WFO Weather Forecast Office

WFP Warm Front Passage

WG Working Group

WGS World Geodetic System

WGS84 World Geodetic System 1984

WI Within

WIBIS Will Be Issued

WICA While in Control Area

WICZ While in Control Zone

WID Width

WIE With Immediate Effect

WILCO Will Comply

WINT Winter

WINTEM Forecast upper wind and temperature for aviation

WIP Work In Progress

WK Weak

WKDAY Weekday

WKEND Weekend

WKN Weaken

WL Will

WLAV Will Advise

WMO World Meteorological Organization

WMSC Weather Message Switching Center

WND Wind

WNW West North West

WNWRN West North Western

WNWWD West North Westward

WO Washington Office

WO Without

WP Waypoint

WPLTO Western Plateau

WPM Words Per Minute

WPRT Waypoint Report

WPT Waypoint

WR Wet Runway

WRC Well to Right of Course

WRM Warm

WRMFNT Warm Front

WRNG Warning

WRS Worse

WS SIGMET

WS Weak Signals

WS Wind Shear

WSCMO Weather Service Contract Meteorological Observatory

WSHFT Wind Shift

WSO Weather Service Office

WSOM Weather Service Operations Manual

WSP Weather System Processor (replacement for LLWAS)

WSR Wet Snow on Runway

WSSF National Weather Service Support Facility

WSSU National Weather Service Support Unit

WSTCH Wash Range

WSW West South west

WSWRN West South Western

WSWWD West South Westward

WT Weight

WTR Water

WTR Well To Right

WTSPT Waterspout

WU Western Union Telegraph Company

WV Wave

WV Wind at altitude (PIREP only)

WW Severe weather forecast

WWW World Wide Web

WX Weather

WX Weather at altitude (PIREP only)

WXCON Weather reconnaissance flight pilot report

WYAIO Will You Accept if Offered the Position of

X

X Cross

X Obscured sky condition

XBAR Crossbar

XCP Except

XFSS Auxiliary Flight Service Station

XH Special handling service for aircraft

XNG Crossing

XPC Expect

XPLOS Explosive

XREP Auxiliary Report

XS Atmospherics

XTAL Crystal

XTLK Cross Talk

XW Crosswind

XX Heavy (to qualify weather phenomena, e.g. XXRA heavy rain)

Y

Y Yukon Standard Time (time groups only)

YCZ Yellow Caution Zone (runway lighting)

YD Yards

YDA Yesterday

YES Yes (affirmative)

YKN Yukon

YL Approach light lane

YLSTN Yellowstone

YMSG Your Message

YMSGD Your Message Date

YR Your

Z

Z Greenwich Mean Time

Z Jet terminal area

ZI Zonal Index

ZI Zone of Interior

ZM Z marker (VHF station location marker)

ZRNO Freezing Rain Information Not Available