word/meaning contraction useage1 or 2 octas (eighths) cloud coverage FEW METARabandon ABND GENabbreviate ABBR GENAbbreviated precision approach path indicator APAPI ICAOabeam ABM GENabnormal ABNML GENaboard ABD GENabout ABT GENabove ABV GENabove aerodrome level AAL ICAOabove clouds ACLD GENabove ground level AGL GENabove mean sea level AMSL GENabove mountains MON ICAOabove sea level ASL GENabove transmitted as received ATAR GENabsolute (temperature) A NWSabundant ABNDT GENaccelerate ACLT GENaccelerate-stop distance available ASDA GENaccept ACPT GENacceptance (message type designator) ACP ICAOaccess ACES GENaccident ACDNT GENaccident notice ACNOT GENaccompany ACPY GENaccount ACCT GENaccount mechanical AMECH GENaccount traffic ATFC GENaccount weather AWX GENaccumulate ACCUM GENacknowledge ACK GENAcknowledgement of receipt (message handling) R GENacross ACRS GENacting ACTG GENactivate ACTVT GENactive ACTV GENactive or activated or activity ACT ICAOactual wind factor ALWF NWSaddition ADDN GENaddress ADS GENadequate ADQT GENadirondack ADRNDCK NWSadjacent ADJ GENadministration ADMIN GENadministrative ADMIV GENadministrator ADMIR GEN

AWC Contractions Sorted by Word/Meaning

advance ADVN GENAdvance boundary information ABI ICAOadvection ADVCTN NWSadvice ADVC GENadvise ADZ GENadvise ADV NWSadvise at what time able AAWTA ICAOadvise by air mail as soon as possible ADMAP GENadvise customs ADCUS GENadvise disposition ADSPN GENadvise or issue instructions to all concerned ADCON GENadvise this office ADZOF GENadvisory ADZY GENadvisory ADVY NWSAdvisory Circular AC GENaerodrome AD ICAOaerodrome beacon ABN ICAOAerodrome chart ADC ICAOaerodrome control tower TWR ICAOaerodrome flight information service AFIS ICAOaerodrome forcast TAF ICAOaerodrome obstacle chart (followed by type & name/title) AOC ICAOAerodrome office (specify service) ADO ICAOaerodrome reference point ARP ICAOaerodrome traffic zone ATZ ICAOaerodromes- air routes and ground aids AGA ICAOaeronautical AERO GENAeronautical Center, FAA AAC GENAeronautical chart 1:500 000 (followed by name/title) ANC ICAOaeronautical fixed service AFS GENAeronautical Fixed Telecommunications Network AFTN GENAeronautical Information Circular AIC GENAeronautical Information Manual AIM GENaeronautical information publications (In General) AIP GENaeronautical information regulation and control AIRAC GENaeronautical information service AIS GENaeronautical information specialist AIS GENaeronautical maps and charts MAP ICAOaeronautical mobile satellite service AMSS ICAOaeronautical mobile service AMS GENAeronautical navigation chart small scale (followed by name/title scale) ANCS ICAOAeronautical Radio, Incorporated ARINC GENAeronautical Telecommunications Network ATN ICAOaeronautical telecommunications operator ATO GENaffect AFCT GENaffirmative AFIRM GENaffirmative AFM ICAOafter AFT GENafter dark AFDK NWSafter passing APSG ICAO

afternoon AFTN GENagain AGN GENagree AGR GENagreement AGRMT GENahead AHD GENair carrier ACR GENAir Carrier District Office ACDO GENAir Defense Control Facility ADCF GENAir Defense Emergency ADE GENair defense identification zone ADIZ GENAir Defense Liaision Officer ADLO GENAir Defense Sector ADS GENair defense warning ADW GENair express AXPS GENAir Force Base AFB GENAir Force Communications Network AIRCOMNET GENAir Force NOTAM Exchange Area AFNEA GENAir Force NOTAM Exchange Office AFNEO GENAir Force Representative to the FAA AFREP GENair freight AFRT GENAir Line Dispatchers Association ALDA GENAir Line Pilots Association ALPA GENair mass AMS NWSAir National Guard ANG GENair navigation facility ANF GENair navigation radio aids ANRA GENair operations network AIROPNET GENair report AIREP GENAir Rescue Service (USAF) ARS GENAir Reserve Base ARB GENair route surveillance radar ARSR GENair route traffic control ARTC GENAir Route Traffic Control Center ARTCC GENair traffic control ATC GENAir Traffic Control Association ATCA GENair traffic division ATD GENair traffic flow management ATFM ICAOair traffic management ATM ICAOair traffic procedures ATP GENAir Traffic Procedures Advisory Committee ATPAC GENair traffic representative ATREP GENair traffic service ATS GENAir Traffic Service Contingency Command Post ATSCCP GENAir traffic services inter-facility data communication AIDC ICAOair traffic services reporting office ARO GENAir Transport Association of America ATA GENair transport pulse radar navigation aid CPN GENair transport pulse radar search CPS GENair transport rating ATR GENair weather service (USAF) AWS GENairborne collision avoidance system ACAS ICAO

airborne early warning AEW GENairborne pulse search radar APS GENAirborne Radar Unit ARU GENaircraft ACFT GENaircraft and engine mechanic AEM GENaircraft classification number ACN ICAOAircraft communication addressing & reporting system ACARS ICAOaircraft control and warning ACW GENaircraft earth station AES ICAOaircraft movement information services AMIS GENaircraft out of commission for parts AOCP GENAircraft Owners and Pilots Association AOPA GENAircraft parking/docking chart (followed by name/title) APDC ICAOairmail ARML GENAirmen's Meteorological Information AIRMET GENAIRMET WA NWSairport ARPT GENairport AP ICAOAirport Development Aid Program ADAP GENAirport District Office ADO GENairport in sight AIS GENairport information desk AID GENairport layout plan ALP GENairport lights APL GENairport manager AMGR GENairport of entry AOE GENairport operating certificate AOC GENairport reference point ARP GENairport reservation position ARP GENAirport Reservations Office ARO GENairport surface detection equipment ASDE GENairport surveillance radar ASR GENairport system plan ASP GENAirport Traffic Control Tower ATCT GENAirport/Facility Directory AFD GENairports program report APR GENair-report ARP GENairspace ASP GENairspace docket ASD GENairspace flight inspection pilot ASIP GENAirspace Reservation Unit (Canadian) ARU GENairway AWY GENairways engineer AENG GENairways facilities sector AFS GENairways facilities sector field office AFSFO GENairways facilities sector field office plus unit AFSFOU GENairways facilities sector office AFSO GENairways technical district office ATDO GENAlaskan Air Command AAC GENAlaskan Region- FAA AAL GENAlaskan Standard Time (time groups only) A NWS

Alberta ALTA NWSalert notice ALNOT GENalerting ALR ICAOAleutian ALUTN NWSalighting area ALA GENalignment ALNMT GENall (when used as prefix) AL GENall accident notice offices ALANO GENall air carrier field offices ALACFO GENall air defense liaison officers in region ALADLO GENall air route traffic control centers in region ALARTC GENall air traffic (area) supervisors in region ALATAS GENall air traffic field facilities ALATF GENall air traffic field offices ALATFO GENall air traffic service personnel in region ALAT GENall airway facilities sector and field offices ALAFFO GENall AT combined station/centers in region ALCS/C GENall AT combined station/towers in region ALCS/T GENall ATC towers in region ALTWR GENall concerned notified ACN GENall FAA field offices and personnel ALFAA GENall FAA offices on Service B ALFAB GENall flight service stations in region ALFSS GENall flight standards field offices ALFSFO GENall international aeronautical telecommunication switching centers ALIATSC GENall international air traffic switching centers AIATSC GENall international field offices ALIFO GENall international flight service stations in region ALIFSS GENall offices having send-receive teletypewriter service on circuit ALCKT GENall quadrants ALQDS NWSall radar ATC facilities in region ALRAFAC GENall regional offices ALRGN GENall sectors ALSEC NWSall up weight (gross weight) AUW GENAllegheny ALGHNY NWSallotment advice ADVALT GENallowable take-off gross weight ATOG GENaloft ALF NWSalong ALG GENalternate ALTN GENalternate (aerodrome) ALTN ICAOalternate airport ALTPT GENaltimeter ALTM GENaltimeter setting ALSTG GENaltimeter setting indicator ASI GENaltimeter sub-scale setting to obtain elevation when on the ground QNH ICAOAltimetry system error ASE ICAOaltitude ALT GEN

altitude reservation ALTRV GENaltocumulus AC NWSaltocumulus castellanus ACCAS NWSaltostratus AS NWSamber A GENambiguity AMB GENamend / amended forecast AMD GEN/amendment AMDT GENAmerican Meteorological Society AMS NWSAmerican Telephone and Telegraph Company ATT GENamount AMT GENamplifier or amplify AMP GENamplitude AMPLTD NWSanalysis ANLYS NWSannounce ANNC GENannual leave AL GENanswer ANS GENante meridiem AM NWSantenna ANT GENanticipate ANCPT GENanticyclonic ACYC NWSAppalachian APLCN NWSapparent APRNT GENappear APPR GENappoint APNT GENapproach APCH GENapproach control or approach control office APP ICAOapproach end runway AER GENapproach light system ALS GENapproach path alignment panel APAP GENappropriate APROP GENapproval APVL GENapproval request APREQ GENapprove APV GENapproximate APRX GENApron APN ICAOarctic (air mass) A NWSArea chart ARC ICAOarea command post ACP GENarea forecast ARFOR GENarea forecast FA NWSarea forecast center AFC NWSarea minimum altitude AMA ICAOarea navigation RNAV GENarea notice ARNOT GENarea supervisor ARSUP GENArmy Air Field AAF GENArmy Liaison Officer ARLO GENArmy National Guard RNG GENArmy radar approach control facility ARAC GENaround ARND GEN

arrange ARNG GENarrest ARST GENarresting gear A-GEAR GENarrival or arrive ARR GENas soon as possible ASAP GENas soon as possible SAP ICAOascend ASND GENascent to ASC GENASOS automated observation with precipitation discriminator (rain/snow) AO2 NWSASOS automated observation without recipitation discriminator (rain/snow) AO1 METARasphalt ASPH GENassign ASGN GENAssigned altitude deviation AAD ICAOassistant ASST GENassistant chief AC GENassociate ASSOC GENat all times AATM GENat or above AOA GENat or below AOB GENat sea MAR ICAOat the coast COT ICAOat this time ATTM GENATC beacon interrogator ATCBI GENATC facility ATCF GENATC operations representative ATCOR GENATC radar beacon system ATCRBS GENATC specialist ATCS GENATC Systems Command Center ATCSCC GENAtlantic ATLC NWSatmospheric pressure at airport elevation QFE ICAOatmospherics XS ICAOatmospherics SFERICS NWSATS/MET reporting point MRP ICAOattach ATCH GENattempt ATMT GENattempt to locate ALCT GENattend ATND GENattention ATTN GENAurora Borealis AURBO NWSauthority AUTH GENauthority granted AUGRA GENauthority is requested AUREQ GENauthorize AUZ GENauthorized AUTH ICAOautomated flight information service FISA ICAOAutomated Flight Service Station AFSS GENAutomated Radar Terminal Sytems ARTS GENautomated surface observing system ASOS NWSautomatic AUTO GEN

automatic broadcast ABCST GENautomatic carrier landing system ACLS GENautomatic data processing ADP GENautomatic data processing equipment ADPE GENautomatic data processing systems ADPS GENautomatic dependent surveillance ADS ICAOautomatic dependent surveillance unit ADSU ICAOautomatic direction finder ADF GENautomatic error correction equipment ARQ GENautomatic ground air/ground communication system AGACS GENautomatic instrument landing system AILS GENAutomatic Meteorological Observing System AMOS GENAutomatic Network Management System ANMS GENautomatic scanning control unit ASCU GENautomatic scanning unit out of service SCANO GENautomatic scanning unit returned to service SCAOK GENautomatic send/receive AS/R GENautomatic terminal information service ATIS GENautomatic weather broadcast equipment AWBE GENautomatic weather observing/reporting system AWOS GENautomatic weather reporting system AUTOB GENauxiliary AUX GENAuxiliary Aviation Weather Facility AAWF NWSauxiliary report XREP GENavailable AVBL GENaverage AVG GENaviation AVN GENAviation Area Forecast Center FA CENTER GENaviation gasoline AVGAS GENaviation routine weather report METAR ICAOaviation selected special weather report SPECI METARAviation Weather and NOTAM System AWANS GENaviation weather processors AWP NWSawait or awaiting AWT GENazimuth AZM GENback course BC GENback course marker BCM GENbacking BCKG NWSbackup emergency communication BUEC GENbalance BAL GENballoon BLN GENbaroclinic or baroclinic prognosis BACLIN NWSbarometer BRM NWSbarotropic or barotropic prognosis BATROP NWSbase of overcast BOVC NWSBase Operations Office BASOPS GENbasic meteorological services BMS NWSbeach BCH NWSbeacon BCN GENbearing BRG GENbecome BCM GEN

becoming (expected between 2 digit beginning hour and 2 digit ending hour) BECMG TAFbefore BFR GENbefore dark BFDK NWSbegan or begin BGN GENbeginning of precipitation (time in minutes) (weather reports only) B NWSbehind BHND GENbelow BLO GENbelow BLW ICAObelow clouds BLO ICAObeneath BNTH GENBering Standard Time (time groups only) B NWSBerkshire BRKSHR NWSBermuda BDA NWSbetter BTR GENbetween BTN GENbetween BTWN NWSbetween layers BTL ICAObeyond BYD GENbids accepted for the following vacancies BAFVC GENbids solicited BDSLD GENbids solicited as follows BSAF GENBlack Hills BLKHLS NWSblanket BLKT NWSblizzard BLZD NWSblowing BL METARblowing dust BLDU METARblowing sand BLSA METARblowing snow BLSN METARblowing spray (weather reports only) BY METARblue B GENbomber BMBR GENbombimg BOMB GENborder BDR GENbound BND GENboundary BNDRY NWSbraking BRKG ICAObraking action BA GENbraking action fair BRAF GENbraking action good BRAG GENbraking action nil BRAN GENbraking action poor BRAP GENbranch BR GENbreak BRK NWSbreaks in higher overcast BRKHIC NWSbreaks in overcast BINOVC NWSbrief BRF NWSbright BRGT GENbright radar indicator tower equipment BRITE GENBritish Columbia BC NWS

broadcast BCST GENbroadcast station BCSTN GENbroken BKN METARbuild BLD NWSbuilding BLDG ICAObuildup BLDUP NWSbulletin BUL GENbureau BUR GENbusiness BUS GENbuzzer (radar) BZR GENby visual reference to the ground VSA ICAOby way of VIA GENbytes per second BPS GENcalibration CLBR GENcalibration performance monitoring equipment CPME GENCall sign CS ICAOcalling CLG ICAOCanada CAN NWSCanadian CNDN NWSCanadian Airspace Reservation Unit CARU GENCanadian Armed Force CANFORCE GENCanadian Armed Forces Transport Command CAM GENCanadian Forces Air Defense Command CFADC GENCanadian NORAD Region CANR GENCanadian NOTAM CANOT GENcancel CNL GENcancel CNCL NWScandela CD ICAOcapable CPBL GENcapacity CPTY GENcaptain CAPT GENcarbon copy CC GENCaribbean CARIB NWScascades CASCDS NWScatalogue number CANO GENcategory CAT GENcategory CTGY NWScathode ray tube CRT GENCatskills CTSKLS NWScaution CTN GENcaution advised until further notice CAUFN GENceiling CIG NWScelestial navigation CELNAV GENcelsius C GENcenter CNTR GENcenterline CNTRLN GENcentimeter CM ICAOcentral CNTRL GENcentral altitude reservation function CARF GENCentral Computer Complex CCC GENcentral flow control function CFCF GEN

central flow weather service unit CFWSU GENCentral Region- FAA ACE GENCentral Standard Time (time groups only) C NWScentral weather service unit CWSU GENcentre (runway ID) C ICAOcentre line CL ICAOcertificate CERT GENcertification CERTIF GENcertify CRTFY GENchance CHC NWSchange CHG GENchange frequency to CF ICAOchange of appointing office CAO GENchange weight manifest CWM GENchangeover point COP GENchannel CHNL GENchannel CH ICAOchapter CHAP GENcharacteristic CHARC GENcharge CHRG GENcharter CHTR GENcheck CK ICAOcheck area airports CARA GENcheck okay CHOK GENchemicals CHM GENChesapeake CHSPK NWSChief Airport District Office CADO GENchief controller CCTLR GENcircle CRC GENcircling guidance light CGL ICAOcircuit CKT GENcircuit line up CLU GENcircuit notice CIRNOT GENcircular polarization CP GENcirculate CRLC GENcirrocumulus CC NWScirrostratus CS NWScirrus CI NWSCity (or County) Civil Defense Director at____ CCD GENcivil CIV ICAOCivil Aeronautics Board CAB GENcivil air carrier turbojet CACT GENCivil Air Patrol CAP GENcivil defense CD GENcivil engineer CENGR GENcivil reserve air fleet CRAF GENclarify CFY GENclear CLR NWSclear air turbulence CAT GENclear and smooth CLRS NWS

clear or scattered clouds and visibility greater than ten miles CAVU NWSclear or scattered clouds and visibility greater than ten remainder of report missing (weather reports only) DCAVU NWSclear type of ice formation CLA ICAOclearance CLNC GENclearance delivery CD GENcleared Customs CCUS GENclearway CWY ICAOclimb to or climbing to CMB ICAOclockwise CLKWS GENclose of business COB GENclose this office CLOTO GENclosed CLSD GENclosing date CLODA GENclosing station CL GENcloud CLD NWScloud and visiblity OK CAVOK NWScloud base BASE GENcloud top TOP NWScoast CST NWSCoast Guard CG GENCoast Guard Air Station CGAS GENCoast Guard LORAN Station CGLS GENcoastal zone management CZM GENCockpit voice recorder CVR ICAOCold (air mass) K NWScold front CDFNT NWScold front passage CFP NWScollect COLL GENcollision avoidance system CAS GENcolon CLN GENcombine COMB GENcombined approach control/international station CAP/IS GENcombined center/RAPCON CERAP GENcombined station/center CS/C GENcombined station/tower CS/T GENcomma CMA GENCommander in Chief- North American Aerospace Defense-Command CINCNORAD GENcommence CMNC GENcommercial COML GENcommercial broadcasting station BS ICAOcommission CMSN GENcommon aviation weather subsystem CAWS NWScommon ICAO data interchange network CIDIN ICAOCommon IFR Room CIFRR GENcommon terminal radar approach control CTRAC GENcommunication COM GENcommunications duty officer CDO GENcommunications equipment CE GEN

communications, navigation and surveillance CNS ICAOcompact CMPCT GENcompany CO GENcompare COMPR GENcompartment COMPRT GENcompass locator COMLO GENcompass locator at ILS middle marker LMM GENcompass locator at ILS outer marker LOM GENcomplete CMPLT GENcomplete crew CCRU GENcomplete or completed or completion CMPL ICAOcomplete power failure CPF GENcomplex CMPLX GENcomponent CMPT GENcomposite flight data processing CFAD GENcomposite radar data processing CRAD GENcomposition CMPSN GENcomputer display channel CDC GENconcrete CONC GENconcurrently CNCNT GENcondensation trails CONTRAILS NWScondition COND GENconfidence CONFDC NWSconfidential CONF GENconfiguration CONFIGN GENconfine CFN GENconfirm CFM GENConfirm or I confirm CFM ICAOconfirming requisition follows COREQ GENcongestion CGSTN GENconnect CNCT GENconsider CSDR GENconsiderable CSDRBL GENconsistent CNSTNT GENconsol beacon CONSOL GENCONSOLAN Facility CONSO GENconsolidate CSLDT GENconstruction CONST GENconstruction maintenance supervisor CMS GENcontact CTC GENcontinental (air mass) C NWScontinental control area CCA GENContinental Divide CONTDVD NWSContinental NORAD Region CONR GENcontinue or continuously CONT GENcontinues CONS ICAOcontinuous 24-hour service H24 ICAOcontinuous wave CW ICAOcontract CONTR GENcontrol CTL GENcontrol area CTLA GEN

control area CTA ICAOcontrol boundary CTLB GENcontrol zone CTLZ GENcontrol zone CTR ICAOcontroller CTLR GENcontroller in charge CIC GENController-pilot data link communications CPDLC ICAOControllers’ Operations and Procedures Committee COPCOM GENconvective CNVTV NWSconvene CVN GENconverge CNVG GENconversion CNVSN GENconvert CNVRT GENcoordinate COORD GENCoordinated Universal Time UTC GEN

Coordinated Universal Time Coordinate Check Completed UTCOK GENCoordinates COORD ICAOcoordination CDN ICAOcorrect or corrected or correction COR GENcounterclockwise CCLKWS NWScounty CO GENcoupled CPD GENcourse CRS GENcover CVR GENcover COV ICAOcrash locator beacon CLBN GENcrash phone activated CPA GENcrew chief CRCHF GENCross X ICAOcrossbar XBAR ICAOcrossing XNG ICAOcruise CRZ ICAOcryptographic CRYPTO GENcrystal XTAL GENcumuliform CUF ICAOcumulonimbus CB NWScumulonimbus mamma CBMAM NWScumulus CU NWScumulus fractus CUFRA NWScurrent flight plan CPL ICAOcustoms CUST ICAOcustoms has been notified CUSNO GENCyclic redundancy check CRC ICAOcyclogenesis CYCLGN NWScyclonic CYC NWScylinder CYL GENdaily DLY GENDaily DLY ICAOdaily flight log DFL GENDakotas DKTS NWS

damage DMG GENdanger DGR GENdanger DNG ICAOdanger area D ICAOdangerous cargo DGCGO GENdata link DOLLY GENData link automatic terminal information service D-ATIS ICAOData link initiation capability DLIC ICAOData link VOLMET D-VOLMET ICAOdata terminal equipment DTE GENdata transmission feature DTF GENdata transmission request DTR GENdate of birth DOB GENdate time group DTG GENdaybreak DABRK NWSdaylight DALGT GENdecibel DB GENdecision altitude DA ICAOdecision height DH GENdecommission DCMSN GENdecrease DCR GENdeep DP NWSdeepening DPNG NWSdefense DEF GENDefense Commercial Communications Office DECCO GENDefense Communications Agency DCA GENdefense communications system DCS GENDefense Mapping Agency Aerospace Center DMAAC GENDefense Mapping Agency Hydrographic Center DMAHC GENDefense Nuclear Agency DNA GENDefense Readiness Conditions DEFCON GENDefense Switching Network DSN GENdefense VFR DVFR GENdefinite DFNT GENdegree DEG GENdelay DLA GENdelayed RTD ICAOdelete DLT GENdeliver DLVR GENdeliver by telephone DELPHO GENdelivery DLVY GENdemolition DEMOL GENdemonstration DMSTN GENdense DNS NWSdense upper cloud DUC ICAOdepartment DEPT GENDepartment of Commerce DOC GENDepartment of Defense DOD GENDepartment of Energy DOE GENDepartment of Transportation DOT GENdeparture DEP GEN

depth DPT ICAOdepth DPTH NWSdeputy chief DCF GENDeputy Commander for Operations DO GENdescend to or descending to DES ICAOdescribe DB GENdesignate a friction value representing runway surface conditions (Greek letter) MU GENdesignated DSGND GENdesire DSR GENdestination DESTN GENdetail DTL GENdeteriorate DTRT NWSdetermine DTRM GENdevelop DVLP GENdew point DWPNT NWSdew point temperature DP ICAOdiagonal DGNL GENdiameter DIAM GENdifference in depth of modulation DDM GENdiffers DFRS GENdifficult DFCLT GENdiffuse DFUS GENdiffuse DIF ICAOdigital altimeter setting indicator DASI GENdigital barometer altimeter setting indicator DBASI GENDigital flight data recorder DFDR ICAOdiminish DMSH NWSDiplomatic Telecommunications Service DTS GENdirect DRCT GENdirect DCT ICAOdirect altitude and identification readout equipment DAIRE GENDirect conroller-pilot communications DCPC ICAOdirect current DC GENdirect readout infrared DRIR GENdirect route DR GENdirect user access terminal system DUATS GENdirection DRCTN GENdirection finder DF GENdirection finding station DFSTN GENDirectives Management Officer, FAA DMO GENdirector DIR GENdisabled DISABLD GENdiscontinue DISC GENdispersal DSPRL GENdisplace DSPLC GENDisplaced runway threshold DTHR ICAOdisplay DSPL GENdisposition DSPN GENdisregard DSRGD GENdisseminate DISEM GEN

dissipate DSIPT NWSdistance DSTC GENdistance DIST ICAOdistance from touchdown indicator DFTI GENdistance measuring equipment DME GENdistant DSNT GENdistant early warning DEW GENdistant early warning identification zone DEWIZ GENdistinguished visitors DV GENdistort DST GENdistribute DISTR GENdistrict DIST GENdistrict airport engineer DAE GENditto DO GENdiverge DVRG GENdiversion DVRSN GENdivert DIV ICAOdivision DIV GENDME-collocated with glide slope DMEG GENDME-collocated with localizer DMEL GENDME-collocated with VOR DMEV GENDME-tactical air navigation with DME only commissioned DMER GENdo all possible DAP GENdocking DCKG ICAOdocument DCMT GENdoing business as DBA GENdomestic DOM ICAOdomestic services (island operations) DS GENdominant DMNT GENdoppler VHF omni-directional radio range DVOR ICAOdouble DBL GENdouble channel duplex DCD ICAOdouble channel simplex DCS GENdouble sideband DSB ICAOdoubtful DBTF GENdowndrafts DWNDFTS NWSdownslope DNSLP NWSdownstream DNSTRM NWSdownward vertical velocity DVV NWSdrawing DWG GENdrift DRFT NWSdrizzle DZ ICAOdrizzle DRZL NWSdual tandem wheels DTW ICAOdual wheels DW ICAOduplex DX GENduplicate DUPE GENduration DURN GENduration DUR ICAOduring DURG GENduring DRG ICAO

dust devils PO METARdust storm DS METARduststorm, sandstorm, rising dust or sand SA METARearly ERY GENearly departure authorized EDA GENeast or eastern longitude E ICAOeastbound EBND GENeastbound EB ICAOEastern Region- FAA AEA GENEastern Standard Time (time groups only) E NWSeast-north east ENE ICAOeast-northeastern (weather reports only) ENERN NWSeast-northeastward (weather reports only) ENEWD NWSeast-south east ESE ICAOeast-southeastern (weather reports only) ESERN NWSeast-southeastward (weather reports only) ESEWD NWSeference datum height (ILS) RDH ICAOeffect EFCT GENeffective EFF GENelectric ELEC GENelectrical engineer EENGR GENelectrician ELECN GENelectronic counter measures ECM GENelectronic equipment modification EEM GENelectronic geographic coordinator navigation system EGECON GENelectronic installation technician EIT GENelectronic maintenance inspector EMI GENelectronic maintenance technician EMT GENelectronic mechanic technician ELMT GENelectronic specialist ECSP GENelectronic technician ET GENelectronic unit EU GENelectronic voice switching system EVS GENelevate or elevation ELEV GENelliptical ELIP GENelongate ELNGT NWSelsewhere ELSW GENembedded EMBDD NWSembedded (in cloud layer) EMBD ICAOemergency EMERG GENemergency gear EG GENemergency location beacon - aircraft ELBA ICAOemergency locator transmitter ELT GENemergency security control of air traffic ESCAT GENemergency use only EUO GENemission EM ICAOen route ENRT GENen route automated radar tracking system EARTS GENen route communications ECOM GENen route communications RCOM GENen route flight advisory service EFAS GEN

en route radar (broadband) ERAD GENen route secondary radar beacon (broadband) ESEC GENen route surveillance radar RSR ICAOencounter ENCTR GENencrypt for transmission only EFTO GENend exercise point EEP GENending ENDG GENending of precipitation (time in minutes) (weather reports only) E NWSendurance ENDCE GENengine ENG GENengineer ENGR GENEngineering and Manufacturing District Office EMDO GENengine-generator E/G GENenhanced ENHNCD GENenhancement ENHNCMNT GENen-route ENR ICAOEnroute chart (followed by name/title) ENRC ICAOentered on duty EOD GENentire ENTR GENentire field available EFA GENenvironment meteorological support unit EMSU NWSequatorial (air mass) E NWSequipment EQUIP GENequipment EQPT ICAOequipment certified EQCRT GENError (to be used in AFS as a procedure signal) EEE ICAOespecially SPCLY GENessential ESNTL GENestablish ESTAB GENestimate or estimation EST GENestimated elapsed time EET ICAOestimated latitude ELAT GENestimated longitude ELONG GENestimated off-block time EOBT ICAOestimated time en route ETE GENestimated time of arrival ETA GENestimated time of departure ETD GENestimated time over significant point ETO ICAOet cetera ETC GENEurope- Africa- and Middle East Office- FAA AEU GENevacuation EVAC GENevaluate or evaluation EVAL GENevening EVE GENevery EV ICAOexamination EXAM GENexcept EXCP GENexcept EXC ICAOexcept XCP NWSexchange EXCH GENexchange and repair E/R GEN

exclude EXCLD GENexclusive EXCLV GENexecute EXCT GENexecutive EXEC GENexercise EXER ICAOexpanded service volume ESV GENexpect EXPC GENexpect EXP ICAOexpect XPC NWSexpected operations forecast EOF NWSexpedite EXPED GENexpedite delivery EXDLVY GENexpedite delivery by telephone EXPHO GENexpedite mail reply EXREP GENexpedite shipment EXSHI GENexplosive XPLOS GENexpress EXPS GENextend EXTD GENextension EXTN GENextensive EXTSV GENextra long range ELR ICAOextra section EXSEC GENextrapolate EXTRAP NWSextreme EXTRM NWSextremely high frequency (30000 to 300000 MHz) EHF ICAOFAA Contract Weather Observing Station FCWOS GENFAA requirements FAAR GENfacilitation of international air transport FAL ICAOfacility FAC GENfacility chief FACF GENfacility coordination officer FCO GENfacsimile FAX GENfahrenheit F GENfahrenheit FAH NWSfalling FLG NWSfamiliar or familiarization FAM GENfamiliarization flight FFLT GENfan marker FM GENfan marker located with radio beacon FMH GENfarther or further FTHR GENfederal aid to airports program FAAP GENFederal Aviation Administration FAA GENFederal Aviation Regulations FAR GENFederal Communications Commission FCC GENFederal Telecommunications System FTS GENfeet FT GENfeet per minute FPM GENfield FLD ICAOfigure FIG GENfilament FIL GENfiled but impracticable to transmit FIBI NWS

filed flight plan FPL ICAOfiled flight plan in the air AFIL GENfiling time FT GENfilling FILG NWSfinal approach FNA ICAOfinal approach fix FAF GENfinal approach point FAP ICAOfire warning FWRNG GENfiring FIRG GENfiring FRNG ICAOfirst available FIRAV GENfixed federal monitoring network FFMN GENfixed pulse radar navigation aid FPN GENfixed wing special IFR FW/SIFR GENfixed wing special VFR FW/SVFR GENfixed-base operator FBO GENflares FLR ICAOflash advisory FL NWSflashing FLG ICAOFleet Weather Central FWC NWSflight FLT GENflight check FLTCK GENflight data FDAT GENFlight Data Center FDC GENflight data position FLIDAP GENFlight data processing system FDPS ICAOflight engineer FE GENflight information (permanent) FI/P GENflight information (temporary) FI/T GENFlight Information Center FIC GENflight information publication FLIP GENFlight Information Region FIR GENFlight Information Region Boundary FIRB GENflight information service FIS GENflight inspection F GENFlight Inspection District Office FIDO GENFlight Inspection Field Office FIFO GENFlight Inspection Field Office - High Altitude FIFO-H GENflight inspection group FIG GENflight level FL GENFlight management system FMS ICAOflight orders FLTO GENflight path deviation indicator FPDI GENflight plan FP GENflight plan PLN ICAOflight plan not received FPNO GENflight plan route FPR GENFlight Service Station FSS GENFlight Services Station Operations and Procedures- Committee FSSCOM GENFlight Standards District Office FSDO GEN

Flight Standards National Field Office FSNFO GENflight strip printer FSP GENflight watch area FWA GENflight watch control station FWCS GENflight watch outlet FLTWO GENflight watch point FWP GENflight watch specialist FWS GENflight watch unit FWU GENflood stage FLDST NWSflood warning issued FLWIS NWSflorescan instrument landing system FILS GENflow management unit FMU ICAOfluctuating FLUC ICAOfluctuation FLCTN GENfluorescent runway lighting (floodlight system) FLORL GENflurry FLRY NWSfog FG METARfog dispersal operations DENEB ICAOfog in vicinity VCFG METARfog partial PRFG METARfog patches BCFG NWSfollow FLW GENfollowing amendment authorized effective FAMAE GENfollowing transmitted as received (message handling) FTAR GENfoot FT GENfor your information FYI GENforcast upper wind and temperature for aviation WINTEM ICAOforecast FCST GENforecast upper wind and temperature at specified points ARMET GENforecast wind factor FRWF NWSforenoon FORNN NWSform FRM GENformat FMT GENformation FRMN GENforming FRMG NWSforward FWD GENforward collect FWDC GENfreeze FRZ NWSfreezing drizzle FZDZ METARfreezing fog FZFG METARfreezing level FRZLVL NWSfreezing rain FZRA METARfreezing rain information not available (weather reports only) ZRNO NWSfrequency FREQ GENfrequency division data link FDDL GENfrequency management officer FMO GENfrequent FQT GENfrequent FRQ ICAOfrom FM GENFrom (used to precede the call sign of the calling station) DE ICAO

front FNT NWSfrontal passage FROPA NWSfrontal surface FROSFC NWSfrontogenesis FNTGNS NWSfrontolysis FNTLYS NWSfrost FRST NWSfrozen FRZN NWSFSS assumes control of tower frequencies and lights FATFL GENFSS assumes flight-plan area and Service B FAFAB GENFSS guarding Service B FGSB GENFSS returns control of tower frequencies and lights FRTFL GENFSS returns flight-plan area and Service B FRFAB GENFSS returns Service B FRSB GENfuel advisory departure FAD GENfuel on board FOB GENfuel remaining FR GENfull route clearance FRC GENfunction FNCTN GENfunnel cloud FC METARfurnish FURN GENgarble GRBL GENgeneral GEN GENgeneral aviation GA GENGeneral Aviation District Office GADO GENgeneral notice GENOT GENGeneral Safety District Office GSDO GENgeneral safety inspector GSI GENGeneral Services Administration GSA GENgenerator GNTR GENgeographic GEO GENgeographical reference GEOREF GENGeoid undulation GUND ICAOget quick answer GQA GENgigahertz GHZ GENgive better address GBA GENgive better reference GBR GENgiving GVG GENglaze icing GICG NWSglide angle GA GENglide path GP GENglide slope GS GENglider GLDR GENglider GLD ICAOglobal navigation satellite system GLONASS ICAOglobal navigation satellite system (in general) GNSS ICAOGlobal orbiting navigation satellite system GLONASS ICAOGo ahead, resume sending (to be used in AFS as a procedure signal) GA ICAOgovernment GOVT GENgovernment bill of lading GBL GENgovernment vehicle GVH GEN

Governor GOV GENgradient GRAD NWSgradual GRADU ICAOgradual GRDL NWSGrand Banks GRBNKS NWSgrass landing area GRASS ICAOgravel GRVL GENGreat Circle GTCL GENGreat Lakes GRTLKS NWSGreat Lakes Region- FAA AGL GENgreater GTR GENGreen G ICAOGreenwich Mean Time GMT GENGreenwich Mean Time Z GENgrid point values of processed meteorological data GRID ICAOgross weight GWT GENground GND GENground check GNDCK ICAOground control GC GENground control approach GCA GENground control intercept GCI GENground earth station GES ICAOground fog GNDFG NWSGround movement chart (followed by name/title) GMC ICAOground to air G/A ICAOground to air and air to ground G/A/G ICAOground visibility GV NWSGulf of Alaska GLFALSK NWSGulf of California GLFCAL NWSGulf of Mexico GLFMEX NWSGulf of St. Lawrence GLFSTLAWR NWSgusts GSTS NWSgusts reaching (knots) (weather reports only) G NWSgusty GSTY NWShail (greater than 3/4") GR METARhail showers SHGR METARhail showers (small) SHGS METARhailstones HLSTO NWShalf HLF GENhangar HNGR GENhard freeze HDFRZ NWSHawaiian Air Defense Division HADD GENHawaiian Air Defense Identification Zone HADIZ GENHawaiian Air National Guard HANG GENHawaiian Defense Area HADA GENhazard HAZ GENhazard beacon HBN ICAOhazardous inflight weather advisory service HIWAS GENhaze HZ METARheading HDG ICAOheadquarters HQ GEN

heater HTR GENheavy HVY GENheavy (to qualify weather phenomena- e.g. XXRA - heavy rain) XX ICAO hectopascal HPA ICAOheight HGT GENheight above airport HAA GENheight above landing HAL GENheight above touchdown HAT GENhelicopter HEL GENhelicopter operations HOP GENheliport HELI GENhere HR GENhere ER ICAOhertz Hz GENheterodyne HTN GENhigh HI NWShigh altitude balloon HIBAL GENhigh and very high frequency direction finding stations HVDF ICAOhigh clouds visible HCVIS NWShigh density traffic airport HDTA GENhigh frequency HF GENhigh frequency direction finding station HDF ICAOhigh index HX NWShigh intensity approach light system HIALS GENhigh intensity runway lights HIRL GENhigh level forecast HIFOR NWShigh voltage HV GENhigher HYR ICAOhighest temperature HITMP NWShighest temperature equaled for all time HIEAT NWShighest temperature equaled for the month HIEFM NWShighest temperature equaled so early HIESE NWShighest temperature equaled so late HIESL NWShighest temperature exceeded for all time HIXAT NWShighest temperature exceeded for the month HIXFM NWShighest temperature exceeded so early HIXSE NWShighest temperature exceeded so late HIXSL NWShighway HWY GENhilltop HLTP NWSholding HLDG ICAOholding pattern HP GENholiday HOL GENhorizon HRZN GENhospital aircraft HOSP ICAOhour HR GENhousehold effects HHE GENhowever HWVR GENHudson Valley HDSVLY NWShundred HND GENhurricane HURCN NWS

hurricane report HUREP NWShydraulic HYD GENhydrographic HYDRO GENice crystals (weather reports only) IC METARice on runway IR NWSice pellet showers SHPL METARice pellets PL METARicing ICG NWSicing in clouds ICGIC NWSicing in clouds and precipitation ICGICIP NWSicing in precipitation ICGIP NWSidentification ID GENidentification beacon IBN ICAOidentification friend/foe IFF ICAOidentify or identifier or identification IDENT GENif incorrect advise IIA GENif incorrect service direct IISD GENif not off INOF GENif not possible INP GENif unable IFUN GENIFR military training route IR GENILS-partial ILSP GENimmediate IMDT NWSimmediate or immediately IMT GENimmigration IMG ICAOimportant IMPT GENimpracticable IMP GENimprove IPV GENimprove IMPR ICAOimpulse IMPL GENin accordance with IAW GENin and out of clouds IAO ICAOin clouds INC ICAOin overcast IOVC NWSin progress INPR ICAOin RVR indicates visibility greater than highest reportable sensor value (e.g. P600FT) P METARin RVR indicates visibility less than lowest reportable sensor value (e.g. M600) M METARin temperature field means "minus" or below zero M METARin valleys VAL ICAOinadequate INADQT GENinbound INBD ICAOinch IN GENinclude INCL GENinclusive INCLV GENincomplete INCOMP GENincorporated INC GENincorrect INCOR GENincrease INCR GENindefinite INDEF GEN

independent sideband ISB ICAOindicate INDC GENIndication of a request RQ ICAOindividual development plan IDP GENindustrial INDUS GENinertial navigation system INS ICAOinformation INFO GENinformation request INREQ GENinitial approach INA ICAOinitial approach fix IAF GENinitial training INIT GENinland LAN ICAOinland INLD NWSinland navigation facility INF GENinner marker IM GENinoperative INOP GENinspect INSP GENinstability INSTBY NWSinstall INSTL GENinstruct INSTR GENinstructor pilot IP GENinstrument INST GENinstrument INSTR ICAOinstrument approach chart (followed by name/title) IAC ICAOinstrument approach procedure IAP GENinstrument flight rules IFR GENinstrument landing system ILS GENinstrument meteorological conditions IMC GENinsufficient scheduled time available INSUF GENintend INTD GENintense INTS NWSintensify INTSFY NWSintensify or intensifying INTSF ICAOintensity INTST GENIntensity unknown (weather reports only) IMI ICAOIntensity unknown (weather reports only) U NWSintentions INTNS GENInteragency Group on International Aviation IGIA GENintercept INTCP GENintercontinental INTCNTL GENInterdepartmental Radio Advisory Committee IRAC GENinterfacility data IDAT GENinterference INTFC GENinterim standard microwave landing system ISMLS GENinterior INTR NWSintermediate INTMD GENintermediate approach fix IF ICAOintermediate fix IF GENintermittent INTMT GENintermittent INTER ICAOInter-Mountain Region INTRMTRGN NWS

international INTL GENInternational Administrative Aeronautical Radio-Conference IAARC GENInternational Aeronautical Telecommunications-Switching Center IATSC GENInternational Air Transport Association IATA GENInternational Civil Aviation Organization ICAO GENinternational dateline DTLN NWSInternational Field Office IFO GENInternational Flight Information Manual IFIM GENInternational Flight Service Station IFSS GENinternational general aviation IGA ICAOinternational standard atmosphere ISA ICAOInternational Telecommunications Union ITU GENinterphone IFO GENinterphone (service F) not operative IFONO GENinterphone (service F) resumed operation IFORO GENinterrogation sign IMF GENinterrogator INTRG ICAOinterrupt INTRP GENinterruption of air traffic services INATS GENintersection INTXN GENintersection INT ICAOintersection of air routes IAR ICAOinterstate INSTA GENinterval INTVL GENinversion INVRN NWSinvestigate INVES GENinvestigate and report INVSTAR GENirregular IREG GENisland IS GENIsland Manager ISMGR GENisolate ISOL GENitinerant ITNRNT GENitinerary ITRY GENjet approach landing charts JAL GENjet stream JTST ICAOjet stream JTSTR NWSjourneyman JOUR GENjunction JCTN GENkeep this office advised KEPOA GENkilling frost KFRST NWSkilocycles KC GENkilogram KG GENkilohertz KHZ GENkilometers KM GENkilometers per hour KMH ICAOkilopascal KPA ICAOkilowatt KW GENknots KT GENlaboratory LAB GEN

labrador LABRDR NWSlake LK NWSlake reporting service LRS GENlaminar flow control LFC GENland LND GENland lines communications facilities LICOF GENlanding LNDG GENlanding LDG ICAOlanding direction indicator LDI ICAOlanding distance available LDA ICAOlanding rights airport LRA GENlandline LL GENlandline teletypewriter LTT ICAOlarge LRG GENlater LTR GENlatitude LAT GENlatter LTTR GENlayer or layered or layers LYR NWSlead in lighting system LDIN GENleave or leaving LVE ICAOleaving LV GENLeft L ICAOlength LEN ICAOletter LTR GENletter follows LETFO GENletter of agreement LOA GENliaison officer LO GENlift LFT NWSlight LGT GENlight and variable LTAV GENlight and variable LV ICAOlight intensity high LIH ICAOlight intensity low LIL ICAOlight intensity medium LIM ICAOlighted LGTD ICAOlightning LTNG NWSlightning cloud-to-air LTGCA NWSlightning cloud-to-cloud LTGCC NWSlightning cloud-to-cloud,cloud to ground LTGCCCG NWSlightning cloud-to-ground LTGCG NWSlightning cloud-to-water LTGCW NWSlightning in clouds LTGIC NWSlikely LKLY GENlimit LMT GENlimited LTD ICAOLimited Aviation Weather Reporting Station LAWRS GENline LN GENline of position LOP GENline squall LSQ ICAOlinearity LIN GENliquid propane LP GEN

little LTL GENlittle change LTLCG NWSlittle change in temperature LCTMP NWSlocal airport advisory LAA GENlocal control LC GENlocal coordinator LOCOR GENLocal Mean Time LMT ICAOlocal or locally LCL GENLocal Standard Time LST GENlocalizer LOC GENlocalizer LLZ ICAOlocally LOC ICAOlocate LCT GENlocator L ICAOlocator middle LM ICAOlogical acknowledgement LAM ICAOlogistics L GENlong distance LD GENlong distance navigation LODISNAV GENlong range LRG GENlong range LGRNG NWSlong range accuracy LORAC GENlong range air navigation system LORAN GENlong range VHF/UHF communications LRCOM GENlong wave LGWV GENlongitude LONG GENlongitudinal LONGL GENloose snow on runway LSR NWSlow altitude bombing system LABS GENlow drifting DR METARlow drifting dust DRDU METARlow drifting sand DRSA METARlow drifting snow DRSN METARlow frequency LF GENlow frequency intersection LFNT GENlow frequency radio range LFR GENlow IFR (weather reports only) LIFR NWSlow index LX NWSlow intensity runway edge lights LIRL GENlow level wind shear LLWS GENlow level wind shear alert system LLWAS GENlow or medium frequency long range navigational aid CONSOLAN GENlow or medium frequency radio range stations RR GENlow/medium frequency L/MF GENlower LWR GENlowest temperature LOTMP NWSlowest temperature equaled for all time LOEAT NWSlowest temperature equaled for the month LOEFM NWSlowest temperature equaled so early LOESE NWSlowest temperature equaled so late LOESL NWSlowest temperature exceeded for all time LOXAT NWS

lowest temperature exceeded for the month LOXFM NWSlowest temperature exceeded so early LOXSE NWSlowest temperature exceeded so late LOXSL NWSMach number M GENMackay Radio and Telegraph Company MACKAY GENmagnetic MAG GENmagnetic bearing QDR ICAOmagnetic heading MHDG GENmagnetic heading QDM ICAOmagnetic orientation of runway QFU ICAOmagnetic variation VAR ICAOmain meteorological office MMO NWSmainland MNLD NWSmainly MNLY GENmaintain MNTN ICAOmaintenance MAINT GENmaintenance assumes monitor MAM GENmaintenance check MCK GENmaintenance returns monitor MRM GENmanagement MGMT GENmanager MGR GENmaneuver MNVR GENManitoba MAN NWSmanual MAN GENmanual A1 simplex MAS ICAOmanual amendment MANAM GENmanual of operations MANOP GENmanufacturing inspector MI GENmap analysis MA NWSmarginal MRGL NWSmarginal VFR MVFR NWSMarine Corps Air Station MCAS GENMarine Corps Air Station (Helicopter) MCAS(H) GENmaritime MRTM NWSmaritime (air mass) M NWSmarked MKD GENmarker MKR GENmarker beacon MB GENmarker radio beacon MKR ICAOmaterial MTRL GENmaximum MAX GENmaximum authorized (IFR) altitude MAA GENmaximum usable altitude MUA GENmaximum usable frequency MUF GENmean sea level MSL GENmechanic MECH GENmechanical reliability report MRR GENmedical MED GENmedium MED GENmedium and high frequency direction-finding station (same location) MHDF ICAO

medium and very high frequency direction-finding station (same location) MVDF ICAOmedium frequency MF GENmedium frequency direction finding station MDF ICAOmedium high and very high frequency direction-finding station (same location) MHVDF ICAOmedium intensity approach lighting system MALS GENmedium intensity approach lighting system with runway alignment indicator lights MALSR GENmedium intensity approach lighting system with sequenced flashers MALSF GENmedium intensity runway edge lights MIRL GENmedium range MRG GENmegahertz MHz GENmelting level MLTLVL NWSmemorandum of agreement MOA GENmemorial MEML GENmerging MEGG NWSMerit Promotion Program MPP GENmessage MSG GENMessage …(transmission identification) has been misrouted MSR ICAOmessage center MSGCTR GENmeteorological MET GENMeteorological Aeronautical Presentation System MAPS GENmeteorological information for aircraft in flight VOLMET ICAOmeteorological officer METOF GENMeteorological Operational Telecommunications-Network Europe MOTNE ICAOMeteorological Watch Office MWO ICAOmeters per second MPS ICAOmetres (preceded by figures) M ICAOmetric units MTU ICAOmetropolitan METRO GENMexico MEX NWSmicrowave landing system MLS GENMid-Canada Identification Zone MIDIZ GENmiddle MID GENmidnight MIDN NWSmidpoint MIDPT GENmid-point (related to RVR) MID ICAOmile MI GENmiles per hour MPH GENmilitary MIL GENMilitary Airlift Command MAC GENmilitary alert system MAS GENmilitary assumes responsibility for separation of aircraft MARSA GENmilitary flight service MFS GENmilitary height finder radar MHFR GENmilitary operations area MOA GENMilitary Radar Unit MRU GEN

military training route MTR GENmillibars MB GENmillimeter MM GENmillivolt MV GENmimeographic notice MIMNO GENminimum MNM ICAOminimum altitude at glide slope intersection inbound MAGSI GENminimum crossing altitude MCA GENminimum descent altitude MDA GENminimum descent height MDH ICAOminimum en route altitude MEA GENminimum eye height over threshold MEHT ICAOminimum holding altitude MHA GENminimum obstacle clearance (required) MOC ICAOminimum obstruction clearance altitude MOCA GENMinimum operational performance standards MOPS ICAOminimum reception altitude MRA GENminimum requirements specified MIREQ GENminimum safe altitude warning MSAW GENminimum safe/sector altitude MSA GENminimum terrain clearance altitude MTCA GENminimum vector altitude MVA GENminimum when control zone effective MCZNE GENMinistry of Transport (Canada) MOT GENminus MS NWSminute MIN GENmiscellaneous MISC GENmissed approach point MAP GENmissed approach point MAPT ICAOmissile MISL GENmissing MISG GENmissing (weather reports only) M NWSMissing …(transmission identification) MIS ICAOmist BR METARmixed MXD NWSmoderate MDT GENmoderate or greater MOGR NWSmodernization MDZN GENmodernize MDZ GENmodernized weather teletypewriter communications system MWTCS GENmodify MDFY GENmodulate or modulation or modulator MOD GENmodulated continous wave MCW ICAOMohawk Valley MHKVLY NWSmoisture MSTR NWSmomentary MTRY GENmonitor MNT ICAOmonitor MONTR NWSmonitor out of service MONOS GENmonitor resumed normal operation MONOK GEN

monitor station reports MOREPS GENMonopulse secondary surveillance radar MSSR ICAOmorning MRNG NWSmostly MSTLY NWSmountain MT ICAOmountain MTN NWSMountain Standard Time (time groups only) M NWSmountain wave MTW ICAOmove MOV NWSmulti-object phase tracking and ranging MOPTAR GENmultiple MULT GENmunicipal MUNI GENmunicipal airport MARPT GENmust ride company material RIMAT GENname to NTO GENnarrow NRW GENnational NATL GENNational NTL ICAONational Aeronautics and Space Administration NASA GENNational Air Transport Coordinating Committee NATCC GENNational Aircraft Noise Abatement Council NANAC GENNational Airport System Plan NASP GENNational Airspace Data Interchange Network NADIN GENNational Airspace System NAS GENNational Airspace System Interfacility Communications System NICS GENNational AIS system centre NASC ICAONational Association of Air Traffic Control Specialists NAATS GENNational Aviation Facilities Experimental Center NAFEC GENnational beacon code allocation plan NBCAP GENNational Climatic Data Center NCDC GENNational Communications Center NATCOM GENnational communications schedule NACOS GENNational Communications System NCS GENnational environmental satellite service NESS GENNational Flight Data Center NFDC GENNational Flight Data Digest NFDD GENNational Guard NG GENNational Meteorological Center NMC GENNational Ocean Service NOS GENNational Oceanic and Atmospheric Administration NOAA GENNational Severe Storm Forecast Center NSSFC GENNational Transportation Safety Board NTSB GENNational Weather Service NWS GENNational Weather Service Support Facility WSSF GENNational Weather Service Support Unit WSSU GENnautical mile NM GENnautical mile radius NMR GENNaval Air Facility NAF GENNaval Air Station NAS GENNaval Auxiliary Air Station NAAS GEN

Naval Oceanographic Meteorological Automatic Device NOMAD GENNaval Reserve Air Base NRAB GENNaval Weather Service Office NWSO GENnavigation NAV GENNavigation, ATC, and Collision Avoidance System NATCAS GENnavigational aid NAVAID GENNavy Liaison Officer NAVLO GENNavy Representative to the FAA NAVREP GENNDB and DME (collocated) NDB/DME GENnear NR GENnear or over large towns CIT ICAOnecessary NEC GENnegative NEG GENnegative replies not required NONEG GENnegative vorticity advection NVA NWSneighborhood NBRHD GENNew Brunswick NB NWSNew England NEW ENG NWSNew England Region- FAA ANE GENNewfoundland NFLD NWSnext NXT GENnight NGT NWSnight frequency NFQ GENnimbostratus NS NWSNo (negative) NO ICAOno action necessary NOAC GENno change NC GENno change in weather NCWX NWSno filing time NFT GENno further information NOFIN GENno information NOIFN GENno layers NL NWSno middle name NMN GENno pilot balloon observation due to high or gusty surfacewind PIWI NWSno pilot balloon observation due to snow PISO NWSno pilot balloon observation due to unfavorable sea conditions PISE NWSno pilot balloon observation will be filed next collection unless weather changes significantly NORPI NWSno procedure turn required NOPT GENno radio NORDO GENno RAWIN obs. high and gusty winds RAWI NWSno RAWIN obs. unfavorable weather RAWE NWSno RAWIN obs., communications out RACO NWSno RAWIN obs., no balloons available RABA NWSno RAWIN obs., no gas available RAHE NWSno record NOREC GENno record of destination NRD GENno reply heard NRH ICAOno reply received NORR GEN

no report NOREP GENno restrictions NORST GENno significant change NOSIG ICAOno significant cloud NSC ICAOno significant weather NSW METARno small craft or storm warning are being displayed NSCSWD NWSno special observations taken (weather reports only) NOSPL NWSno specific working hours HX ICAONo transgression zone NTZ ICAOno trouble found NTFND GENnoise abatement test system NATS GENnondirectional radio beacon NDB GENnone NIL GENnonpersistent NPRS NWSnonprecision instrument NPI GENnonrevenue NRV GENnonstandard holding pattern NSP GENnonstop NSTP GENNORAD Region Operations Control Center ROCC GENNORAD Sector Operations Control Center SOCC GENnormal NML GENnormal operating zone NOZ GENNormal operating zone NOZ ICAONorth American Aerospace Defense Command NORAD GENNorth American Route NAR GENNorth Atlantic NAT GENnorth or northern latitude N ICAOnorthbound NBND GENnorthbound NB ICAOnorth-east NE ICAOnorth-eastbound NEB ICAOnortheasterly (weather reports only) NELY NWSnortheastern NERN NWSnorth-north east NNE ICAOnorth-north west NNW ICAOnorth-northeastern (weather reports only) NNERN NWSnorth-northeastward (weather reports only) NNEWD NWSnorth-northwestern (weather reports only) NNWRN NWSnorth-west NW ICAONorthwest Mountain Region- FAA ANM GENnorth-westbound NWB ICAOnorthwesterly (weather reports only) NWLY NWSnorthwestern (weather reports only) NWRN NWSnorth-westward (weather reports only) NNWWD NWSnot above NAB GENnot according to routine NAR GENnot applicable N/A GENnot at present NAP GENnot authorized NA GENnot available NO METARnot before NBFR ICAO

not for us NFU GENnot in system NIS GENnot later than NLT GENnot to exceed NTE GENNOTAM Office NOF GENNOTAM 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 SNOWTAM ICAONOTAM Summary NOSUM GENNotice to Airmen NOTAM GENnotify NTFY GENNova Scotia NS NWSnow simultaneous NOSI GENnuclear detonation NUDET GENnumber NR GENnumber NMBR NWSnumerous NMRS GENobliterate OBL GENobscure OBSC NWSobscured sky condition X NWSobservation OBS NWSobstacle OBST ICAOobstacle assessment surface OAS ICAOobstacle clearance altitude OCA ICAOobstacle clearance height OCH ICAOobstacle clearance limit OCL ICAOobstacle clearance surface OCS ICAOObstacle free zone OFZ ICAOobstruct OBST GENobstruction OBSTN GENobstruction chart OC GENoccasional OCNL GENocclude OCLD NWSoccluded frontal passage OFP NWSocclusion OCLN NWSocculuded front OCFNT NWSoccur OCR GENocean station vessel OSV NWSoceanic air route tracking system OARTS GENoceanic area control OAC GENoceanic ATC OCAC GENoceanic control area OCA ICAOoff watch OFW GENoffice OFC GENofficial OFFL GENOfficial Airline Guide OAG GENoffshore OFSHR NWSomni intersection OINT GENomnidirectional approach lighting system ODALS GENon board OB GENon file O/F GEN

On line data interchange OLDI ICAOon request O/R GENon shore ONSHR NWSon top and smooth OTAS NWSon watch ONW GENone way OW GENOntario ONT NWSon-the-job training OJT GENopaque, white type of ice formation OPA ICAOopen OPN ICAOoperate OPER GENoperate, operator, operational OPR ICAOoperating normally OK GENoperation OPN GENoperation and regulation OANDR GENoperational control OPC ICAOoperational meteorological (information) OPMET ICAOoperations OPS ICAOoperations normal OPNML GENopposite direction traffic OPDT GENoptimum working frequency OWF GENorder, indication of ORD ICAOorganized track system OTS GENoriginal ORIG GENoriginal flight plan OFP GENOriginate OGN ICAOorographic ORGPHC NWSother OTR GENotherwise OTRW GENour message OMSG GENout for maintenance OFM GENout of service OTS GENout of tolerance OOT GENoutbound OUBD ICAOouter locator LO ICAOouter marker OM GENoutlook OTLK NWSoutside air temperature OAT GENover OVR GENover mountains OMTNS NWSovercast OVC NWSoverdue OVD GENoverflight traffic OTFC GENoverhead OVHD GENoverhead OHD ICAOoverlay OVLA GENovernight OVNGT GENoverrun OVRN GENoverrun lights ORL GENoverseas OVSEA GENoverseas flight assistance service OFAS GEN

overtake OVTK GENovertime O/T GENoxygen OXY GENPacific PAC NWSPacific Standard Time PST GENPacific Standard Time (time group only) P NWSpacked snow on runway PSR NWSpanhandle PNHDL NWSparachute PRCHT GENparachute jumping activities PAJA GENparachute jumping exercise PJE ICAOparagraph PARA GENparallel PARL ICAOparent FSS assumes control of part-time FSS PACF GENparent FSS returns control of part-time FSS PRCF GENparenthesis PAREN GENparking PRKG ICAOpartial PR METARparticipate PTCP GENpartly PTLY NWSpassage PSG NWSpassenger PSGR GENpassenger PAX ICAOpassenger service PS GENpassing PSG NWSpatches BC METARpatches of shallow fog not deeper than two meters MIFG NWSpatchy PTCHY NWSpattern PAT GENpavement classification number PCN ICAOpay period (number) PP GENpeak wind (weather reports only) PK WND NWSpeninsula PEN NWSperforator PERF GENperformance PER ICAOperiod PD GENperipheral communications PERCOM GENpermanent PERM GENpermanent change of station PCS GENpermission PMSN GENpermit PMT GENpersist PRST GENpersonal PSNAL GENpersonnel PSNL GENpersonnel and equipment working PAEW GENpersons on board POB ICAOphoto reconnaissance PR GENphysical PHYS GENpickup PUP GENpierced steel planking PSP ICAOpilot balloon observation PIBAL NWS

pilot controlled lighting PCL GENPilot controlled lighting PCL ICAOpilot controller glossary P/CG GENpilot in command PIC GENpilot instructor training PIT GENpilot requests forecast PIRFC GENpilot self-briefing terminal PSBT GENpilot to forecaster service PFSV GENpilot weather briefing PWB GENpilot weather report PIREP GENpilots automatic telephone weather answering service PATWAS GENplace of birth PLOB GENplan position indicator PPI ICAOplease PLS GENplow (snow) PLW NWSplus PS NWSpolar (air mass) P NWSpolar track structure PTS ICAOportion PTN GENposition PSN GENposition subject to return of incumbent PSRI GENposition subject to rotating shifts PSRS GENpositive POS GENpositive control area PCA GENpositive vorticity advection PVA NWSpossible PSBL GENpossible POSS ICAOpost meridiem PM GENpost office PO GENpounds (weight) LB GENpower PWR GENpower failure PWRNO GENpower restored PWROK GENprecaution PRCTN GENprecede PRECD GENprecipitation PCPN NWSprecipitation identifier information not available (weather reports only) PWINO NWSprecision approach PA GENprecision approach lighting system PALS ICAOprecision approach path indicator PAPI GENprecision approach radar PAR GENPrecision approach terrain chart PATC ICAOprecision instrument runway PIR GENPre-departure clearance PDC ICAOpredominant PDMT NWSpredominate PDMT NWSpreferential arrival/departure route (Stage A) PDAR GENpreferential departure route (Stage A) PDR GENPre-flight information bulletin PIB ICAOprepare PRP GEN

present PRSNT NWSpresent address unknown PAU GENpresent indications are PRIND GENpresent level PLVL ICAOPresident on board civil aircraft EXEC-1 GENPresident’s family is aboard aircraft EXEC-1F GENpressure PRES GENpressure altitude PA GENpressure falling rapidly PRESFR NWSpressure jump (weather reports only) PRJMP NWSpressure rising rapidly PRESRR NWSprevail PVL GENprevalent PVLT GENprevious PREV GENprimary PRIM GENprimary PRI ICAOprimary radar PRIRA GENPrimary surveillance radar PSR ICAOprincipal PRIN GENprinter PTR GENprior notice required PN ICAOprior permission required PPR GENpriority delayed weather PDW NWSprivate PVT GENprivate line telephone PLF GENprivate line teletypewriter PLT GENprivately owned aircraft POA GENprivately owned vehicle POV GENprobability PROB ICAOprobability PRBLTY NWSprobability 40 percent PROB40 METARprobable PRBL GENprobable PBL NWSprocedure PROC GENprocedure signal PROSIG GENprocedure turn PT GENprocedure turn PTN ICAOprocedures for air navigation services PANS ICAOproceed PROCD GENproceed PCD ICAOprognosis or prognostic PROG NWSprogress PROG GENprohibited area P ICAOpropagation PROPA GENpropeller PROP GENpropose PPS GENproposed boundary crossing time PBCT GENprovide PRVD GENprovisional PROV ICAOpseudo random noise PRN GENpublic PUB GEN

public buildings service PBS GENpublish PUBL GENPuget Sound PGTSND NWSpulsating/steady visual approach slope indicator PVASI GENpurchase order PO GENquadrant QUAD GENqualify QLFY GENquality QLTY GENquantity QNTY GENquarter QTR GENquasistationary QSTNRY NWSQuebec QUE NWSquestion QN GENquota flow control procedures QFLOW GENradar advisory RARAD GENradar approach control RAPCON GENradar ATC facility (USN) RATCF GENradar beacon RADON GENradar bomb scoring RBS GENradar bright display equipment RBDE GENradar cloud detection report RCD NWSradar cloud detection report no echoes observed RCDNE NWSradar cloud detection report not available RCDNA NWSradar cloud detector inoperative due to breakdown until RCDNO NWSradar cloud detector inoperative due to maintenance until RCDOM NWSradar data (digitized) RDAT GENradar dome wind RDWND NWSradar echo height information not available RHINO NWSradar microwave link repeater RMLR GENradar microwave link terminal RMLT GENradar operating below prescribed standard ROBEPS NWSRadar position indicator RPI ICAOradar position symbol RPS ICAOradar range height indicator not operating on scan RHINO NWSradar range station RR GENradar responder beacon RACON GENradar weather report RAREP NWSradar weather report equipment inoperative due to breakdown PPINO NWSradar weather report equipment inoperative due to maintenance PPIOM NWSradar weather report equipment operation resumed PPIOK NWSradar weather report no echoes observed PPINE NWSradar weather report not available (or omitted for a reason different than those otherwise stated) PPINA NWSradial RDL ICAOradio RDO ICAOradio and communication facilities inoperative RACFI GENradio beacon RBN GENradio communication failure RCF ICAOradio communications link repeater RCLR GEN

radio communications link terminal RCLT GENradio frequency RF GENradio frequency interference RFI GENradio range RNG ICAOradiocommunication failure RCF ICAOradiosonde analysis and verification unit RAVU NWSradiosonde balloon release RABAR NWSradiosonde balloon wind data RABAL NWSradiosonde observation RAOB NWSradiosonde observation data RADAT NWSradiosonde observation freezing levels RAFRZ NWSradiosonde observation icing at RAICG NWSradiosonde observation not filed RAFI NWSradiosonde report already sent in PIBAL collection RAPI GENradiotelegraph RTG GENradiotelephone RTF GENradioteletypewriter RTT GENradius RDS GENragged RAG ICAOragged RGD NWSrain RA METARrain and snow or showers of rain and snow RASN METARrain showers RASH ICAOrain showers SHRA METARrainfall RNFL NWSrange (lights) RG ICAOrange height indicator RHI GENrapid RPD NWSrate of climb ROC ICAOrate of descent ROD ICAOreach RCH GENreach cruising altitude RCA ICAOready for issue RFI GENreason RSN GENreceipt RCPT GENreceive RCV GENreceive REC ICAOreceive only R/O GENreceive, only centers R/OC GENReceived (acknowledgement of receipt) R ICAOReceiver autonomous integrity monitoring RAIM ICAOreceiver station RS GENreceiving capability out RCVNO GENreclearance in flight RIF ICAOrecleared RECLR ICAOrecommend RCMD GENreconnaissance RECON GENrecord RCRD GENrecord observation (weather reports only) SA NWSrecord special observation (weather reports only) RS NWSredispatch RDSP GEN

redispatch accepted RDSPA GENreduce RDC GENreduction in force RIF GENreference REF GENreference BATCS report REBAT GENreference conversation RECON GENreference form REFORM GENreference invoice REINV GENreference letter RELET GENreference letter from our office ROLET GENreference letter from your office RULET GENreference message REMES GENreference message from our office ROMES GENreference message from your office RUMES GENreference our memorandum ROMEMO GENreference our telephone conversation REFONE GENreference our TWX ROTWX GENreference PBS message REPBS GENreference PBS message from our office ROPBS GENreference requisition from our office RORQN GENreference requisition from your office RURQN GENreference telegram from our office ROTEL GENreference telegram from your office RUTEL GENreference your form RUFORM GENreference your memorandum RUMEMO GENreference your TWX RUTWX GENrefuel RFL GENrefuse RFS GENregard RE GENregion RGN GENRegional AIS system centre RASC ICAOregional and domestic air route area RDARA GENregional area forecast center RAFC ICAORegional Communications Control Center CCC GENregional office RO GENregional office notice RENOT GENregional OPMET bulletin exchange ROBEX ICAOregional supplementary procedures SUPPS ICAOregistration REG ICAOregular RGLR GENregulated output RO GENregulation REG GENrelative RLTV GENrelative bearing RLBG GENrelative humidity RH NWSrelay equipment out of operation RLANO GENrelay equipment resumed operation RLAOK GENrelay station RLSTN GENrelay to RLA ICAOrelease RLS GENrelease subject your discretion SYD GEN

reliable RELBL GENrelief electronic maintenance technician REMT GENrelieve RLV GENrelocate RELCT GENremain RMN GENremaining overnight RON GENremark RMRK GENremark RMK ICAOremote air-ground facility RAGF GENremote communication outlet RCO GENremote communications air/ground facility RCAG GENremote receiver RRCVR GENremote transmitter RTMTR GENrepair RPR GENrepeat RPT GENRepeat or I repeat RPT ICAOreperforator REPERF GENrepetitive flight plan RPL ICAOreplace RPLC GENreply by airmail REPAML GENreply by mail REPML GENreply by message REPMES GENreply by TWX REPTWX GENreport RPRT GENreport leaving RL ICAOreport level RLVL GENreport missing account radio failure RADNO NWSreport or reporting point REP ICAOreport reaching RR ICAOreported for duty RPFOD GENreports identification symbol RIS GENrepresent or representative REP GENrequest REQ GENrequest RQ GENrequest consideration REQON GENrequest flight plan RQP ICAOrequest if desired REQID GENrequest level change en route RLCE ICAOrequest level not available RLNA ICAOrequest permission RQP GENrequest reply RQRP GENrequest supplementary flight plan RQS ICAOrequest your recommendation REQRCM GENrequested REQSTD GENrequire RQR GENrequired navigation performance RNP ICAOrequirements RQMNTS ICAOrequisition RQN GENreroute RERTE ICAOrescue RSCU GENrescue boat RB ICAO

Rescue Coordination Center RCC GENrescue sub-center RSC ICAOrescue vessel RV ICAOresearch project REP GENreservation RSVN GENreserve RES GENresident RES GENresponder beacon RSP ICAOresponse RESP GENrestrict RSTR GENrestrict RESTR NWSrestricted area (followed by identification) R ICAOresumed operation RSOPN GENretained RTND GENretard RTRD GENreturn RTRN GENreturn RTN ICAOreturn to service RTS GENreturned account mechanical RAM GENreturned account weather RAWX GENrevise RVS GENridge RDG NWSright (direction of turn) RITE ICAOright (runway identification) R ICAORight-hand circuit RHC ICAORio Grande RIOGD NWSrising RSG NWSroad reconnaissance RC GENRockies (mountains) RCKY NWSrotate ROT GENrotating ROTG GENrotation per minute RPM GENrough RUF NWSround trip RT GENroute RTE GENroute forcast ROFOR ICAOroutine RTNE GENRoyal Air Force RAF GENRoyal Australian Air Force RAAF GENRoyal Canadian Navy RCN GENrules of the air and air traffic services RAC ICAOrunway RY GENrunway RWY ICAOrunway (used in RVR measurement) R METARrunway alignment indicator RAI ICAOrunway alignment indicator lights RAIL GENrunway arresting gear RAG ICAOrunway center line RCL ICAOrunway center line lights RCLL ICAOrunway centerline light system RCLS GENrunway centerline marking RCLM GEN

runway condition reading RCR GENrunway control van VAN ICAOrunway edge light REDL ICAOrunway end identifier lights REIL GENrunway end light RENL ICAORunway end safety area RESA ICAOrunway lead-in lighting system RLLS ICAOrunway reference point RRP GENrunway reference point downwind RRPD GENrunway reference point upwind RRPU GENrunway remaining lights RRL GENrunway supervisory unit RSU GENrunway surface condition RSCD ICAOrunway threshold light RTHL ICAOrunway touchdown zone light RTZL ICAOrunway visibility by observer RVO GENrunway visibility value RVV GENrunway visual range RVR GENRVR midpoint RVRM GENRVR midpoint not available RVRMNO GENRVR not available RVRNO GENRVR rollout RVRR GENRVR rollout not available RVRRNO GENRVR ten minute average RVRA GENRVR ten minute average not available RVRANO GENRVR ten minute extremes not available RVRENO GENRVR touchdown RVRT GENRVR touchdown not available RVRTNO GENRVV not available RVVNO GENsaint ST GENsame direction traffic SADT GENsand or sanded or sanding SND GENsandstorm SS METARsandstorm or dusting SA ICAOsanitary SAN ICAOSaskatchewan SASK NWSsatellite STLT GENsatellite communication SATCOM ICAOsatisfy or satisfactory SATFY GENscattered SCT NWSschedule SKED GENscheduled data base SDB GENscheduled weather broadcast SWB GENsea level SL GENsea level pressure SLP METARseadrome SEADRM GENseaplane base SPB GENsearch SRCH GENsearch and rescue SAR GENsearch and rescue region SRR ICAOsecond (in line) SCND GEN

second (time) SEC GENsecondary SRY ICAOsecondary radar SECRA GENsecondary surveillance radar SSR GENsection SXN NWSsector SCTR GENsector SECT ICAOsector field office SFO GENsector field unit SFU GENsector manager SECMR GENsecurity SCTY GENsecurity control of air traffic SCAT GENsecurity control of air traffic and air navigation aids SCATANA GENsee our message SOMSG GENsee your service SYS GENselect SLCT GENselective identification feature SIF ICAOself-correcting automatic navigation SCAN GENsemi-annual S/A GENsemi-automatic flight inspection SAFI GENsemi-automatic flight inspection aircraft SAFI GENsemicolon SCLN GENsend/receive center S/RC GENsensitivity SENS GENseparation SEPN GENsequence SEQ GENsequence flashing lights SFL GENservice SVC GENservice SER ICAOservice available during scheduled operations HS ICAOservice available to meet operational requirements HO ICAOserviceable SVCBL ICAOserving SVG GENseveral SVRL GENsevere SVR GENsevere SEV ICAOsevere local storms SELS NWSsevere weather avoidance plan SWAP GENsevere weather forecast WW NWSshallow MI METARshallow SHLW NWSshallow fog MIFG METARshift (weather reports only) SHFT NWSshort SHRT GENshort approach lighting system SALS GENshort range SRG ICAOshort range navigation system SHORN GENshort take-off and landing STOL GENshortly SHRTLY NWSshortwave SHRTWV GENshower SHWR NWS

showers SH METARshutdown SHTDN GENsick leave SL GENside lobe suppression SLS GENSierra Nevada SIERNEV NWSSIGMET WS NWSsignal SGL GENsignature SIG GENsigned SGD GENsignificant SGFNT GENsignificant meteorological information SIGMET GENsignificant weather SIGWX ICAOsimple approach lighting system SALS ICAOsimplified abbreviated visual approach slope indicator SAVASI GENsimplified directional facility SDF GENsimplified short approach lighting system SSALS GENsimplified short approach lighting system with runway alignment indicator lights SSALR GENsimplified short approach lighting system with sequenced flashers SSALF GENsimultaneous SIMUL GENsimultaneous automatic broadcast homer SABH GENsimultaneous compass locator at middle marker SLMM GENsimultaneous compass locator at outer marker SLOM GENsingle SNGL GENsingle channel simplex SCS GENsingle frequency approach SFA GENsingle isolated wheel load SIWL ICAOsingle sideband SSB ICAOsky clear SKC METARsleet SLT NWSslight SLGT GENslight chance PROB30 METARslope SLP GENslow SLO GENslow SLW ICAOslush on runway SLR NWSsmall SML GENsmoke FU METARsmooth SMTH NWSsnow SN METARsnow SNW NWSsnow and ice on runway SIR NWSsnow depth increase in past hour SNOINCR NWSsnow grains (weather reports only) SG METARsnow pellets/small hail (less than 3/4") GS METARsnow showers SNSH ICAOsnow showers SHSN METARsnowbank SNBNK NWSsnowfall SNWFL NWSsnowflake SNFLK NWS

solar-geophysical data SGD NWSsolid SLD NWSsometime SMTM GENsomewhat SMWHT GENSouth or southern latitude S ICAOsouth plains SPLNS NWSsouthbound SB ICAOsouth-east SE ICAOsouth-eastbound SEB ICAOsoutheasterly (weather reports only) SELY NWSsoutheastern (weather reports only) SERN NWSSouthern Region- FAA ASO GENsouth-south east SSE ICAOsouth-south west SSW ICAOsouth-southeastern (weather reports only) SSERN NWSsouth-southeastward (weather reports only) SSEWD NWSsouth-southwestern (weather reports only) SSWRN NWSsouth-southwestward (weather reports only) SSWWD NWSsouth-west SW ICAOSouthwest Region- FAA ASW GENsouth-westbound SWB ICAOsouthwesterly (weather reports only) SWLY NWSsouthwestern (weather reports only) SWRN NWSspace environment laboratory SEL GENspace environment service center SESC GENspace vehicle number SVN GENspecial SPL GENspecial air-report ARS GENspecial handling service for aircraft XH GENspecial requisition priority number SRPN GENspecial VFR SVFR GENspecification SPEC GENspeed SPD GENspeed at pilots discretion SAPD GENspeed limiting point SLP ICAOspiral SPRL GENspot wind SPOT ICAOspray PY METARspread SPRD NWSsprinkle SPKL NWSsquadron SQDN GENsquall SQ METARsquall line SQLN NWSsquawk mode code SMC GENstability index SX NWSstabilized local oscillator STALO GENstable STBL GENstagnation STAGN NWSstandard STD GENstandard 2400' high-intensity approach lighting system with sequenced flashers (Category I configuration) ALSF-1 GEN

standard 2400' high-intensity approach lighting system with sequenced flashers (Category II configuration) ALSF-2 GENstandard form SF GENstandard holding pattern SP GENstandard holding procedure SHP GENstandard instrument approach SIA GENstandard instrument approach procedure SIAP GENstandard instrument departure SID GENstandard jet penetration SJP GENstandard low frequency range approach SLRAP GENstandard omni range approach SORAP GENstandard operating procedure SOP GENstandard range approach SR GENstandard regional route transmitting frequencies RUT ICAOstandard terminal arrival STAR GENstandards and recommended practices SARPS ICAOstandby SDBY GENstanding lenticular altocumulus ACSL NWSstanding lenticular cirrocumulus CCSL NWSstanding lenticular stratocumulus SCSL NWSstation STN GENstation administrator STADMR GENstation manager STMGR GENstation pressure SP NWSstationary STNR ICAOstationary STNRY NWSstatus STS ICAOstatute mile SM GENstatute mile radius SMR GENsteady STDY GENstereo routes STRO GENstop-end (related to RVR) END ICAOstopway STWY GENstopway SWY ICAOstopway light STWL ICAOstored program for alpha numerics SPAN GENstorm STM NWSstraight in approach STA ICAOstraight-in approach SI GENstrategic navigation SN GENstratiform STF ICAOstratiform STFRM NWSstratocumulus SC NWSstratus ST NWSstratus fractus STFRA NWSstrong STG NWSsubject to SUBJ ICAOsubject to correction SUBFIX GENsubmit SMT GENsubside SBSD NWSsubstitute SUB GEN

sufficient SUF GENsuggest SUG GENsummary SMRY GENsunrise SR GENsunrise to sunset HJ ICAOsunset SS GENsunset to sunrise HN ICAOsuper high frequency SHF GENsupercharge SUPCHG GENsupercooled/freezing FZ METARsuperintendent SUPT GENsuperior SUPR GENsupersede SUPSD GENsupersonic transport SST ICAOsupervisor SUPVR GENsupervisory electronics specialist SES GENsupplement SUPPL GENsupplementary aviation weather reporting station SAWRS GENsupplementary flight plan SPL ICAOsupply SUP GENsurface SFC GENsurface aviation observation SAO NWSsurface movement control SMC ICAOsurface movement radar SMR ICAOsurround SRND GENsurveillance approach SA GENsurveillance radar approach SRA ICAOsurveillance radar element of precision approach radar system SRE ICAOsuspend SUSP GENswelling SWLG NWSsynchronous meteorological satellite SMS GENsynopsis SYNS NWSsynoptic SYNOP NWSsystem SYS GENSystem Command Center SCC GENsystem engineer SE GENsystems maintenance sector SMS GENsystems navigation SN GENT visual approach slope indicator system T-VASIS ICAOtactical air command liaison officer TACLO GENtactical air navigation TACR GENtactical air navigational aid TACAN GENtail wind TAIL ICAOtake-off TKOF GENtake-off distance available TODA ICAOtake-off gross weight TOG GENtake-off run available TORA ICAOtandum TAND GENtaxiing guidance system TGS ICAOtaxiway TWY GEN

taxiway link TWYL ICAOteam supervisor TS GENTechnical Center- FAA ACT GENtechnical reason TECR ICAOtechnical standard order TSO GENteleautograph TELAU GENtelecommunications TEL GENtelegraph reply TELRY GENtelephone FONE GENtelephone TEL ICAOtelephone company TELCO GENtelephone conference TELCON GENtelephone exchange TELEX GENteletype switching facilities TTS GENteletypewriter TT GENteletypewriter communications out of service TYPNO GENteletypewriter communications returned to service TYPOK GENteletypewriter exchange service TWX GENteletypewriter station TTY GENtemperature TEMP GENTemperature T ICAOtemporary TMPRY GENtemporary TEMPO METARtemporary appointment pending establishment of a register TAPER GENtemporary duty TDY GENtemporary reserved airspace TRA ICAOtendency TNDCY GENtentative TNTV GENterminal TRML GENterminal area chart TAC GENterminal area surveillance radar TASR GENterminal area surveillance radar TAR ICAOterminal automated radar services TARS GENterminal communications TCOM GENterminal control area TCA GENterminal control area TMA ICAOterminal forecast TAF METARterminal information processing system TIPS GENterminal instrument procedures TERPS GENterminal radar TRAD GENterminal radar approach control facility TRACON GENterminal radar approach control in tower cab TRACAB GENterminal radar service area TRSA GENterminal secondary radar beacon TSEC GENterminal VOR TVOR GENterminate TRMT GENterrain TRRN GENterrain following TF GENTethered Aerostat Radar System TARS GENtetrahedron TET GEN

Text TXT ICAOThe last message received by me was …. LR ICAOThe last message sent by me was …or last message was… LS ICAOthereafter THRFTR GENthick THK NWSthin THN NWSThis is a channel-continuity-check of transmission to permit comparison of your record of channel-sequence numbers of messages received on the channel CH ICAOThis is a duplicate message (to be used in AFS as a procedure signal) DUPE ICAOthousand THSD GENthreaten THTN GENthreshold THLD GENthreshold crossing height TCH GENthreshold crossing height downwind TCHD GENthreshold crossing height upwind TCHU GENthrough THRU GENthroughout THRUT GENthunder THDR NWSthunderhead THD NWSthunderstorm TS METARthunderstorm TSTM NWSthunderstorm with duststorm or sandstorm TSSA METARthunderstorm with hail TSGR METARthunderstorm with ice pellets TSPL METARthunderstorm with rain TSRA METARthunderstorm with small hail TSGS METARthunderstorm with snow TSSN METARtime and attendance report TANDA GENtime delay TDEL GENtime of delivery TOD GENtime of receipt TOR GENtime of transmission TOT GENto be continued TOC GENtoday TDA GENtolerance TLRNC GENtomorrow TMW GENtonight TNGT GENtoo long to print TLTP GENtop of climb TOC ICAOtop of overcast TOVC NWStopping TPG NWStornado TDO ICAOtornado/water spout +FC METARtotal aboard TA GENtouch and go landing TGL GENtouchdown zone TDZ GENtouchdown zone light (system) TDZL GENtoward TWD GEN

tower TWR GENtowering TWRG NWStowering cumulus TCU NWStrace (weather reports only) T NWStrack TR ICAOtraffic TFC GENtraffic alert and collision avoidance system TCAS GENTraffic information broadcast by aircraft TIBA ICAOtraffic zone TFZ GENtraining T GENtraining TRNG GENTrans-Atlantic TSATLC GENtrans-continental TCNTL GENtranscribed weather broadcast TWEB GENtransfer TSFR GENtransient TSNT GENtransition TRSN GENtransition altitude TA ICAOtransition level TRLVL ICAOtransmit TMT GENtransmit or transmitter TRANS ICAOtransmitter distributer TD GENtransmitter station TS GENtransmitting capability out of service TSMNO GENtransmitting capability returned to service TSMOK GENTrans-Pacific TSPAC GENtransport TRNSP GENtransportation request T/R GENtrapping layer TRPLYR NWStravel TVL GENtravel arrangements without government expense TAWOG GENtravel order TO GENtreated TRTD GENtrend TEND ICAOtributary TRIB NWStri-color visual approach slope indicator TRCV GENtropical TRPCL NWStropical (air mass) T NWStropical continental (air mass) TRPCD NWStropical cyclone TC ICAOtropopause TROP NWStrouble TRBL GENtrough TROF NWStrue (bearing) T GENtrue air speed TAS GENtrue bearing QTE ICAOturbojet TBJT GENturbulence TURB ICAOturbulence TURBC NWSturbulent TURBT NWSturn altitude TNA ICAO

turn height TNH ICAOturning point TP ICAOtwilight TWI GENtype aircraft TYP ICAOtyphoon TYPH ICAOU.S. Air Force USAF GENU.S. Army USA GENU.S. Army Aviation Flight Information USAFIB GENU.S. Coast Guard USCG GENU.S. Marine Corps USMC GENU.S. Navy USN GENultra high frequency UHF GENultra high frequency direction finding station UDF ICAOunable UN GENunable UNA ICAOunable higher due traffic UHDT ICAOunable higher due traffic UHDT ICAOunable to approve UNAPV GENunable to approve UNAP ICAOunable to finish INSUF GENunable to monitor UNMON GENunable to transmit NIL GENunattended UNATNDD GENunavailable UNAVBL GENundelivered UNDLD GENunheard UNHRD GENunidentified UNID GENunidentified flying object UFO GENUnited States NOTAM Office USNOF GENUnited States NOTAM System USNS GENunknown UNKN GENunknown precipitation UP METARunlighted UNLGTD GENunlimited UNL GENunnecessary UNEC GENunofficial UNOFFL GENunquote UQOT GENunreadable UNRDBL GENunreliable UNRELBL GENunreliable UNREL ICAOunrestricted UNRSTD GENunsatisfactory UNSATFY GENunscheduled UNSKED GENunseasonable UNSBL NWSunserviceable U/S ICAOunsettle UNSTL NWSunstable UNSTBL NWSunsteady UNSTDY NWSuntil TIL GENuntil further advised UFA GENuntil further notice UFN GEN

untra long range ULR ICAOunusable UNUSBL GENup and down drafts UDDF NWSup drafts UPDFTS NWSupdate UPDT NWSupper UPR NWSupper air route UAR ICAOupper area control center UAC ICAOupper atmosphere geophysics UAG NWSupper control area UTA ICAOupper flight information region UIR ICAOupper information center UIC ICAOupper winds UWNDS NWSupper winds obs. (by radio methods) RAWIN NWSupslope UPSLP NWSupstream UPSTRM NWSupward vertical velocity UVV NWSurgent URG GENurgent special observation (weather reports only) USP NWSusable USBL GENV/STOL approach system VAPS GENvalley VLY NWSVancouver Island, BC VRISL NWSvariable VRBL GENvariable VRB ICAOVariable (weather reports only) V NWSvariation VARN GENveer VR NWSvelocity VLCTY NWSverify VFY GENvertical VER ICAOvertical motion VRT MOTN NWSvertical speed VSP ICAOvertical take-off and landing VTOL ICAOvertical visibility (indefinite ceiling) VV METARvertical/short take-off and landing VSTOL GENvery high frequency VHF GENvery high frequency direction-finding station VDF ICAOvery important person VIP ICAOvery long range VLR ICAOvery low frequency VLF GENvessel VSL GENVFR low altitude training routes TR GENVFR military training routes VR GENVHF omni-directional radio range VOR GENVice President is aboard civil aircraft EXEC-2 GENVice President’s family is aboard aircraft EXEC-2F GENvicinity VCNTY GENvicinity VC METARviolent VLNT NWSvisibility VIS GEN

visibility VSBY NWSvisibility decreasing rapidly VSBYDR NWSvisibility greater than 6 SM (TAF only) P6SM METARvisibility increasing rapidly VSBYIR NWSvisible VSB GENvisual approach chart VAC ICAOVisual approach chart (followed by name/title) VAC ICAOvisual approach slope indicator VASI GENvisual approach slope indicator system VASIS ICAOVisual approack slope indicator systems VASIS ICAOvisual descent point VDP GENvisual flight VFLT GENvisual flight rules VFR GENvisual glide path indicator VSPI GENvisual integrated presentation VIP GENvisual meteorological conditions VMC GENvisual reference gate VRG GENvisual-aural radio range VAR ICAOvoice modulation VM GENvoice operated relay VOPR GENvolcanic ash VA METARvolume VOL GENVOR and DME (collocated) VOR/DME GENVOR and TACAN (collocated) VORTAC GENVOR test signal VOT GENvorticity VOT GENvoucher VOU GENwarm WRM NWSwarm (air mass) W NWSwarm front WRMFNT NWSwarm front passage WFP NWSwarning WRNG NWSwasatch range WSTCH NWSWashington Office WO GENwatch check list completed WCLC GENwater WTR NWSwaterspout WTSPT NWSwave WV NWSwaypoint WP GENwaypoint WPT ICAOWe agree or it is correct OK ICAOweak WK GENweaken WKN GENweather WX GENweather WEA NWSWeather Bureau Regional Headquarters WBRH GENWeather Message Switching Center WMSC GENweather radar analysis and development unit RADU GENweather reconnaissance flight pilot report WXCON NWSweather report will not be filed for transmission FINO NWSWeather Service Contract Meteorological Observatory WSCMO GEN

Weather Service Forecast Office WSFO GENWeather Service Office WSO GENweather service operations manual WSOM NWSweekday WKDAY GENweekend WKEND GENweight WT GENwest or western longitude W ICAOwestbound WB ICAOwestern plateau WPLTO NWSWestern Union Telegraph Company WU GENWestern-Pacific Region- FAA AWP GENwest-north west WNW ICAOwest-northwestern (weather reports only) WNWRN NWSwest-northwestward (weather reports only) WNWWD NWSwest-south west WSW ICAOwest-southwestern (weather reports only) WSWRN NWSwest-southwestward (weather reports only) WSWWD NWSwet runway WR NWSwet snow on runway WSR NWSwhereabouts WBTS GENwhite W ICAOwidely WDLY NWSwidespread WDSPR GENwidespread WDSPRD NWSwidespread dust DU METARwidth WID ICAOwill WL GENwill accept, if offered, the position WAIOP GENwill advise WLAV GENwill be issued WIBIS GENwill be reported by NOTAM WBRBN GENwill comply WILCO GENwill you accept-if offered- the position of WYAIO GENwind WND NWSwind direction indicator WDI ICAOwind shear WS ICAOwind shift WSHFT NWSwing bar lights WBAR ICAOwinter WINT NWSwith effect from, or effective from WEF ICAOwith immediate effect or effective immediately WIE ICAOwithin WI GENwithout WO GENwords per minute WPM GENwork in progress WIP GENworking group WG GENworld aeronautical chart WAC GENWorld aeronautical chart - ICAO 1:1 000, 000(followed by name/title) WAC ICAOworld area forcast center WAFC ICAOWorld Data Centers in Western Europe WDC-1 NWS

World Data Centers throughout rest of world WDC-2 NWSWorld geodetic system 1984 WGS-84 ICAOWorld Meteorological Organization WMO GENWorld wide web WWW ICAOworse WRS GENyards YD ICAOyellow caution zone (runway lighting) YCZ ICAOYellowstone YLSTN NWSYes (affirmative) YES ICAOyesterday YDA GENyou are authorized URAUZ GENyour YR ICAOyour message YMSG GENyour message date YMSGD GENyour recommendation is requested URIZR GENYukon YKN NWSYukon Standard Time (time groups only) Y NWSZ marker (VHF station location marker) ZM GENzonal index ZI NWSzone of interior ZI NWS