JO 7340J.O2E73C4H0G.2E3 Chapter 2. United States of America Aeronautical Contractions Section 1. Decode EXPLANATION OF CODES GEN − Indicates general aeronautical usage. NWS − Indicates National Weather Service and aero- nautical weather usage. ATC − Indicates Air Traffic Control usage. ICAO − Indicates International Civil Aviation Organization usage. International messages should use these. METAR/TAF − Indicates ICAO weather usage. A Contraction Definition Usage +FC tornado/water spout METAR A absolute (temperature) NWS A Alaskan Standard Time (time groups only) NWS A Amber GEN A arctic (air mass) NWS A/A air to air ATC A/C approach control ATC A/G air to ground ICAO A/H already had ATC AAC Alaskan Air Command GEN AAD Assigned altitude deviation ICAO AADC approach and departure control ATC AAF Army Air Field GEN AAITVL arrival aircraft interval ATC AAL Above aerodrome level ICAO AAL Alaskan Region, FAA GEN AAP Advise if able to proceed ATC AAR airport arrival rate ATC AARTE airport acceptance rate ATC AATM at all times GEN AAWF Auxiliary Aviation Weather Facility NWS AAWTA Advise at what time able ICAO AB Airborne ATC ABBR Abbreviate GEN ABCST automatic broadcast GEN ABD Aboard GEN ABI Advance boundary information ICAO ABLCHG airborne launching ATC ABM abeam ICAO ABN aerodrome beacon ICAO ABND abandon GEN ABNDT abundant GEN ABNML abnormal GEN ABT about GEN ABV above ICAO AC Advisory Circular GEN Contraction Definition Usage AC altocumulus NWS AC assistant chief GEN ACA artic control area ATC ACARS Aircraft communication addressing and reporting system ICAO ACAS airborne collision avoidance system ICAO ACC area control center ATC ACC altocumulus castellanus NWS ACCID notification of aircraft accident ATC ACCT account GEN ACCUM accumulate GEN ACDNT accident GEN ACDO Air Carrier District Office GEN ACE Central Region, FAA GEN ACES access GEN ACFT aircraft ICAO ACID aircraft identification ATC ACK acknowledge GEN ACL altimeter check location ATC ACLD above clouds GEN ACLS automatic carrier landing system GEN ACLT accelerate GEN ACM air combat maneuvers ATC ACN aircraft classification number ICAO ACN all concerned notified GEN ACNOT accident notice GEN ACP acceptance (message type designator) ICAO ACP area command post GEN ACPT accept GEN ACPY accompany GEN ACR air carrier GEN ACRBT acrobatic ATC ACRS across GEN ACSL standing lenticular altocumulus NWS ACT active or activated or activity ICAO ACT air combat training ATC ACT Technical Center, FAA GEN ACTG acting GEN ACTV active GEN ACTVT activate GEN ACW aircraft control and warning GEN ACYC Anticyclonic NWS AD Aerodrome ICAO ADA advisory area ATC ADAP Airport Development Aid Program GEN ADC Aerodrome chart ICAO ADCF Air Defense Control Facility GEN ADCON advise or issue instructions to all concerned GEN ADCUS advise customs GEN ADDN addition GEN ADE Air Defense Emergency GEN ADF automatic direction finder GEN ADFAP automatic direction finder approach ATC ADIZ air defense identification zone GEN ADJ adjacent ICAO Contraction Definition Usage ADL aggregate demand list ATC ADLO Air Defense Liaison Officer GEN ADLY arrival delay ATC ADMAP advise by air mail as soon as possible GEN ADMIN administration GEN ADMIR administrator GEN ADMIS aircraft departing at (number of minutes) intervals ATC ADMIV administrative GEN ADNL TFC additional traffic is ATC ADNOK advise if not correct ATC ADO Aerodrome office (specify service) ICAO ADO Airport District Office GEN ADP automatic data processing GEN ADPE automatic data processing equipment GEN ADPS automatic data processing systems GEN ADQT adequate GEN ADR airport departure rate ATC ADR advisory route ATC ADRDE advise reason for delay ATC ADRNDCK adirondack NWS ADRT alternate departure route ATC ADS address GEN ADS Air Defense Sector GEN ADS automatic dependent surveillance ICAO ADS−B Automatic Dependent Surveillance− Broadcast ICAO ADSPN advise disposition GEN ADSU automatic dependent surveillance unit ICAO ADV advise NWS ADVALT allotment advice GEN ADVC advice GEN ADVCTN advection NWS ADVN advance GEN ADVY advisory NWS ADVZY advisory ATC ADW air defense warning GEN ADZ advise GEN ADZAR advise arrival ATC ADZI advise intentions ATC ADZOF advise this office GEN ADZY advisory ATC ADZY advisory GEN AEA Eastern Region, FAA GEN AEM aircraft and engine mechanic GEN AENG airways engineer GEN AER approach end runway GEN AERO aeronautical GEN AES aircraft earth station ICAO AEU Europe, Africa, and Middle East Office, FAA GEN AEVAC air evacuation ATC AEW airborne early warning GEN AFB Air Force Base GEN AFC area forecast center NWS AFCT affect GEN AFD Airport/Facility Directory GEN AFDK after dark NWS AFIL filed flight plan in the air GEN AFIO authorization for interceptor operations ATC AFIRM affirmative GEN AFIS aerodrome flight information service ICAO AFJ Air Force Jet ATC AFM affirmative ICAO AFNEA Air Force NOTAM Exchange Area GEN AFNEO Air Force NOTAM Exchange Office GEN Contraction Definition Usage AFOVRN "Air Force overrun 1000−ft standard approach lighting system" MIL AFRCC Air Force Rescue Coordination Center GEN AFREP Air Force Representative to the FAA GEN AFRT air freight GEN AFS aeronautical fixed service GEN AFSS Automated Flight Service Station GEN AFT after GEN AFTN Aeronautical Fixed Telecommunications Network GEN AFTN afternoon GEN AG air ground ATC AGA aerodromes, air routes and ground aids ICAO AGACS automatic ground air/ground communication system GEN A−GEAR arresting gear GEN AGL above ground level ICAO AGL Great Lakes Region, FAA GEN AGN again GEN AGR agree GEN AGRMT agreement GEN AHD ahead GEN AI arrival approved request for IFR flight ATC AIA advise if able ATC AIATSC all international air traffic switching centers GEN AIC Aeronautical Information Circular GEN AID airport information desk GEN AIDC Air traffic services inter−facility data communication ICAO AIFP activate IFR flight plan ATC AILS automatic instrument landing system GEN AIM Airman’s Information Manual GEN AIP Aeronautical Information Publication ATC AIP aeronautical information publications (In General) GEN AIRAC aeronautical information regulation and control GEN AIRCOMNET Air Force Communications Network GEN AIREP air report GEN AIRFL air refueling ATC AIRMET Airmen’s Meteorological Information GEN AIROPNET air operations network GEN AIS aeronautical information service GEN AIS aeronautical information specialist GEN AIS airport in sight GEN AL all (when used as prefix) GEN AL annual leave GEN AL/(−−−) at least (altitude) ATC ALA alighting area GEN ALACFO all air carrier field offices GEN ALADLO all air defense liaison officers in service area GEN ALAFFO all technical operations GEN ALANO all accident notice offices GEN ALARTC all air route traffic control centers in service area GEN ALAT all air traffic service personnel in service area GEN ALATAS all air traffic (area) supervisors in service area GEN ALATF all air traffic field facilities GEN ALATFO all air traffic field offices GEN Contraction Definition Usage ALCKT "all offices having send−receive tele- typewriter service on circuit" GEN ALCS/C all air traffic combined station/ centers in service area GEN ALCS/T All air traffic combined station/ towers in service area GEN ALCT attempt to locate GEN ALDA Air Line Dispatchers Association GEN ALERFA alert phase code (alerting service) ATC ALF aloft NWS ALFAA all FAA field offices and personnel GEN ALFAB all FAA offices on NADIN GEN ALFSFO all flight standards field offices GEN ALFSS all flight service stations in service area GEN ALG along GEN ALGHNY Allegheny NWS ALIATSC all international aeronautical tele- communication switching centers GEN ALIFO all international field offices GEN ALIFSS all international flight service stations in service area GEN ALNMT alignment GEN ALNOT alert notice GEN ALP airport layout plan GEN ALPA Air Line Pilots Association GEN ALQDS all quadrants NWS ALR alerting ICAO ALRAFAC all radar ATC facilities in service area GEN ALRGN all regional/service area offices GEN ALS approach light system ICAO ALSEC all sectors NWS ALSF−1 standard 2400’ high−intensity approach lighting system with sequenced flashers (Category I configuration) GEN ALSF−2 standard 2400’ high−intensity approach lighting system with sequenced flashers (Category II configuration) GEN ALSTG altimeter setting GEN ALT altitude ICAO ALTA Alberta NWS ALTM altimeter GEN ALTN alternate or alternating ICAO ALTN alternate (aerodrome) ICAO ALTPT alternate airport GEN ALTRV altitude reservation GEN ALTWR all ATC towers in service area GEN ALUTN Aleutian NWS ALWF actual wind factor NWS AM ante meridiem NWS AMA area minimum altitude ICAO AMB ambiguity GEN AMC Air Mobility Command ATC AMC Mike Monroney Aeronautical Center, FAA GEN AMCL amended clearance ATC AMD amend / amended forecast GEN/ AMDT amendment GEN AMECH account mechanical GEN AMGR airport manager GEN AMIS aircraft movement information services GEN AMOS Automatic Meteorological Observing System GEN AMP Amplifier or amplify GEN Contraction Definition Usage AMPLTD amplitude NWS AMRF amended route of flight ATC AMS aeronautical mobile service GEN AMS air mass NWS AMS American Meteorological Society NWS AMSL above mean sea level GEN AMSS aeronautical mobile satellite service ICAO AMT Amount GEN AMVER Automated Mutual−Assistance Vessel Rescue System ATC ANC Aeronautical chart 1:500 000 (followed by name/title) ICAO ANCPT anticipate GEN ANCS Aeronautical navigation chart small scale (followed by name/title scale) ICAO ANE New England Region, FAA GEN ANF air navigation facility GEN ANG Air National Guard GEN ANLYS Analysis NWS ANM Northwest Mountain Region, FAA GEN ANMS Automatic Network Management System GEN ANNC announce GEN ANR Advanced Navigation Routes ATC ANRA air navigation radio aids GEN ANS answer GEN ANT antenna GEN AO1 ASOS automated observation without precipitation discriminator (rain/snow) METAR AO2 ASOS automated observation with precipitation discriminator (rain/ snow) NWS AOA at or above ATC AOAF at or after ATC AOB at or below ATC AOBF at or before ATC AOC aerodrome obstacle chart (followed by type & name/title) ICAO AOC airport operating certificate GEN AOCP aircraft out of commission for parts GEN AOE airport of entry GEN AOPA Aircraft Owners and Pilots Association GEN AP airport ICAO AP anomalous propagation ATC APAP approach path alignment panel GEN APAPI Abbreviated precision approach path indicator ICAO APC area positive control ATC APCH approach ICAO APDC Aircraft parking/docking chart (followed by name/title) ICAO APL airport lights GEN APLCN Appalachian NWS APN Apron ICAO APNT appoint GEN APP approach control or approach control office ICAO APPA advise present position and altitude ATC APPR appear GEN APR airports program report GEN APREQ approval request GEN APRNT apparent GEN APROP appropriate GEN APRX approximate GEN APS airborne pulse search radar GEN APSG after passing ICAO Contraction Definition Usage APV approve GEN APVL approval GEN AR Atlantic Route ATC ARAC area airports checked ATC ARAC Army radar approach control facility GEN ARAD altitude radial ATC ARB Air Reserve Base GEN ARC Area chart ICAO ARCP air refueling control point ATC AREP air refueling egress point ATC AREX air refueling exit ATC ARFF aircraft rescue and fire fighting ATC ARFFOK airport rescue and fire fighting alarm checked ATC ARFOR area forecast GEN ARINC Aeronautical Radio, Incorporated GEN ARIP air refueling initial point ATC ARL Aerial ATC ARLO Army Liaison Officer GEN ARMET forecast upper wind and temperature at specified points GEN ARML Airmail GEN ARND Around GEN ARNG Arrange GEN ARNOT area notice GEN ARO air traffic services reporting office GEN ARO Airport Reservations Office GEN ARP aerodrome reference point ICAO ARP airport reference point GEN ARP airport reservation position GEN ARP air−report GEN ARPT Airport GEN ARQ automatic error correction equipment GEN ARR arrival or arrive ICAO ARS Air Rescue Service (USAF) GEN ARS special air−report GEN ARSA airport radar service area ATC ARSR air route surveillance radar GEN ARST arresting ICAO ARTC air route traffic control GEN ARTCC Air Route Traffic Control Center GEN ARTS Automated Radar Terminal Systems GEN ARU Airborne Radar Unit GEN ARU Airspace Reservation Unit (Canadian) GEN ARUNK arrival unknown ATC AS altostratus NWS AS/R automatic send/receive GEN ASAP as soon as possible GEN ASC ascent to GEN ASCU automatic scanning control unit GEN ASD airspace docket GEN ASDA accelerate−stop distance available GEN ASDE airport surface detection equipment GEN ASE Altimetry system error ICAO ASGN assign GEN ASHTAM volcanic ash advisory ICAO ASI altimeter setting indicator GEN ASIP airspace flight inspection pilot GEN ASL above sea level GEN ASMD assumed ATC ASND ascend GEN ASO Southern Region, FAA GEN ASOS automated surface observing system NWS ASP airport system plan GEN ASP airspace GEN ASPH asphalt ICAO ASR airport surveillance radar GEN Contraction Definition Usage ASSOC associate GEN ASST assistant GEN ASW Southwest Region, FAA GEN ATA actual time of arrival ATC ATA Air Transport Association of America GEN ATAM at and maintain ATC ATAR above transmitted as received GEN ATC air traffic control ICAO ATCA Air Traffic Control Association GEN ATCA ATC advises ATC ATCAA ATC assigned airspace ATC ATCBI ATC beacon interrogator GEN ATCC ATC clears ATC ATCF ATC facility GEN ATCH attach GEN ATCOR ATC operations representative GEN ATCR ATC requests ATC ATCRBS ATC radar beacon system GEN ATCS ATC specialist GEN ATCSCC David J. Hurley ATC Systems Command Center GEN ATCT Airport Traffic Control Tower GEN ATD actual time of departure ATC ATFC account traffic GEN ATFM air traffic flow management ICAO ATIS automatic terminal information service ICAO ATLC Atlantic NWS ATM air traffic management ICAO ATM authentication maneuver ATC ATMT attempt GEN ATMTC attempt to contact ATC ATN Aeronautical Telecommunications Network ICAO ATND attend GEN ATO aeronautical telecommunications operator GEN ATO Air Traffic Organization GEN ATOG allowable take−off gross weight GEN ATP actual time of penetration ATC ATP air traffic procedures GEN ATPAC Air Traffic Procedures Advisory Committee GEN ATR air transport rating GEN ATREP air traffic representative GEN ATRLS actual time of release ATC ATSCCP Air Traffic Service Contingency Command Post GEN ATT American Telephone and Telegraph Company GEN ATTM at this time GEN ATTN attention GEN AT−VASIS Abbreviated T visual approach slope indicator system ICAO ATZ aerodrome traffic zone ICAO AUGRA authority granted GEN AURBO Aurora Borealis NWS AUREQ authority is requested GEN AUTH authority GEN AUTH authorized or authorization ICAO AUTO automatic GEN AUTOB automatic weather reporting system GEN AUW all up weight (gross weight) GEN AUX auxiliary GEN AUZ authorize GEN Contraction Definition Usage AVANA "altitude reservation void for aircraft not airborne by −−−" ATC AVBL available ICAO AVFP activate VFR flight plan ATC AVFPNO pilot failed to activate VFR/DVFR flight plan ATC AVG average GEN AVGAS aviation gasoline ICAO AVN aviation GEN AWA advise when able ATC AWANS Aviation Weather and NOTAM System GEN AWBE automatic weather broadcast equipment GEN AWE advise when established ATC AWL all weather landing ATC AWOS automatic weather observing/ reporting system GEN AWP aviation weather processors NWS AWP Western−Pacific Region, FAA GEN AWS air weather service (USAF) GEN AWT await or awaiting GEN AWX account weather GEN AWY airway ICAO AXPS air express GEN AZM azimuth ICAO AZRAN azimuth and range data ATC Contraction Definition Usage BDRY boundary ICAO BDSLD bids solicited GEN BECMG becoming (expected between 2 digit beginning hour and 2 digit ending hour) TAF BFDK before dark NWS BFR before GEN BGN began or begin GEN BGND begin or beginning descent ATC BHND behind GEN BIFR before encountering IFR conditions ATC BINOVC breaks in overcast NWS BKN broken METAR BL blowing METAR BLD build NWS BLDG building ICAO BLDU blowing dust METAR BLDUP buildup NWS BLKHLS Black Hills NWS BLKT blanket NWS BLN balloon GEN BLO below GEN BLO below clouds ICAO BLSA blowing sand METAR BLSN blowing snow METAR BLW below ICAO BLX block ATC BLZD blizzard NWS BMBR bomber GEN BMS basic meteorological services NWS BND bound GEN BNDRY boundary NWS BNTH beneath GEN BOMB bombing GEN BOVC base of overcast NWS BPOC before proceeding on course ATC BPS bytes per second GEN BPT beginning procedure turn ATC BR Bahama Route ATC BR branch GEN BR mist METAR BRAF braking action fair GEN BRAG braking action good GEN BRAN braking action nil GEN BRAP braking action poor GEN BRF brief NWS BRG bearing GEN BRGT bright GEN BRITE bright radar indicator tower equipment GEN BRK break NWS BRKG braking ICAO BRKHIC breaks in higher overcast NWS BRKSHR Berkshire NWS BRM barometer NWS BS commercial broadcasting station ICAO BSAF bids solicited as follows GEN BSC bird sweep completed ATC BSHP beginning standard holding procedure ATC BSIAP beginning straight­in approach ATC BSRAP beginning standard range approach ATC BSRO begin standard refuel orbit ATC BT back taxiing ATC BTL between layers ICAO BTN between ICAO BTR better GEN BTWN between NWS B Contraction Definition Usage B base leg ATC B beginning of precipitation (time in minutes) (weather reports only) NWS B Bering Standard Time (time groups only) NWS B blue GEN B center clearance delivered ATC BA braking action ICAO BAC below all clouds ATC BACLIN baroclinic or baroclinic prognosis NWS BAFVC bids accepted for the following vacancies GEN BAL balance GEN BASE cloud base GEN BASOPS Base Operations Office GEN BATROP barotropic or barotropic prognosis NWS BC back course GEN BC beginning climb ATC BC British Columbia NWS BC patches METAR BCFG fog patches NWS BCH beach NWS BCKG backing NWS BCM back course marker GEN BCM become GEN BCN beacon ICAO BCREQ broadcast requested ATC BCST broadcast ICAO BCSTN broadcast station GEN BDA Bermuda NWS BDAT beacon data (digitized) ATC BDR border GEN Contraction Definition Usage BUEC backup emergency communication GEN BUIC backup interceptor control ATC BUL bulletin GEN BUR bureau GEN BUS business GEN BY blowing spray (weather reports only) METAR BYD beyond GEN BZR buzzer (radar) GEN Contraction Definition Usage CCC "Regional Communications Control Center" GEN CCD City (or County) Civil Defense Dir­ ector at GEN CCFP collaborative convective forecast product ATC CCLDS clear of clouds ATC CCLKOB counterclockwise orbit ATC CCLKWS counterclockwise NWS CCRU complete crew GEN CCRZ climb and cruise ATC CCSA Class C surface area ATC CCSL standing lenticular cirrocumulus NWS CCTLR chief controller GEN CCUS cleared Customs GEN CD candela ICAO CD civil defense GEN CD clearance delivery GEN CDAS Class D airspace ATC CDC computer display channel GEN CDFNT cold front NWS CDM collaborative decision making ATC CDN coordination ICAO CDO communications duty officer GEN CDSA Class D surface area ATC CE communications equipment GEN CEAS Class E airspace ATC CELNAV celestial navigation GEN CENGR civil engineer GEN CENPAC Central North Pacific ATC CER climb en route ATC CERAP combined center/RAPCON GEN CERT certificate GEN CERTIF certification GEN CESA Class E surface area ATC CF change frequency to ICAO CFA controlled firing area ATC CFAD composite flight data processing GEN CFADC Canadian Forces Air Defense Command GEN CFAP cleared for approach ATC CFM confirm GEN CFM Confirm or I confirm ICAO CFN confine GEN CFP cold front passage NWS CFPL carryover from previous log ATC CFR Code of Federal Regulations GEN CFWSU central flow weather service unit GEN CFY clarify GEN CG Coast Guard GEN CGAS Class G airspace ATC CGAS Coast Guard Air Station GEN CGL circling guidance light ICAO CGLS Coast Guard LORAN Station GEN CGSTN congestion GEN CH channel ICAO CH This is a channel­continu­ ity­check of transmission to permit comparison of your record of chan­ nel­ sequence numbers of messages received on the channel ICAO CHAP chapter GEN CHARC characteristic GEN CHC chance NWS CHG change GEN CHGO changing over ATC CHM chemicals GEN CHNL channel GEN C Contraction Definition Usage C celsius GEN C Central Standard Time (time groups only) NWS C centre (runway ID) ICAO C circling (approach and landing charts) ATC C continental (air mass) NWS C/A Coarse/Acquisition ATC CA clear above (PIREP only) ATC CAAS Class A Airspace ATC CAC change to approach control or changing to approach control ATC CAC contact approach control ATC CACT civil air carrier turbojet GEN CADO Chief, Airport District Office GEN CAM Canadian Armed Forces Transport Command GEN CAN Canada NWS CANFORCE Canadian Armed Force GEN CANO catalogue number GEN CANOT Canadian NOTAM GEN CANR Canadian NORAD Region GEN CAO change of appointing office GEN CAP Civil Air Patrol GEN CAP/IS combined approach control/ international station GEN CAPD climb at pilot’s discretion ATC CAPT captain GEN CARA check area airports GEN CARF central altitude reservation function GEN CARIB Caribbean NWS CARU Canadian Airspace Reservation Unit GEN CAS calibrated airspeed ATC CAS collision avoidance system GEN CASCDS cascades NWS CAT category ICAO CAT clear air turbulence GEN CATX climb and cross ATC CAUFN caution advised until further notice GEN CAVOK cloud and visibility OK NWS CAVU clear or scattered clouds and visibility greater than ten miles NWS CAWS common aviation weather subsystem NWS CB cumulonimbus NWS CBAS Class B airspace ATC CBMAM cumulonimbus mamma NWS CBSA Class B surface area ATC CC carbon copy GEN CC cirrocumulus NWS CCA continental control area GEN CCAS Class C airspace ATC CCC Central Computer Complex GEN Contraction Definition Usage CHOK check okay GEN CHOV changeover ATC CHRG charge GEN CHSPK Chesapeake NWS CHTR charter GEN CI cirrus NWS CIC controller in charge GEN CIDIN common ICAO data interchange network ICAO CIFP cancel IFR flight plan ATC CIFR cancel IFR clearance previously given ATC CIFRR Common IFR Room GEN CIG ceiling NWS CINCNORAD Commander in Chief, North Amer­ ican Aerospace Defense Command GEN CIRNAV circumnavigate ATC CIRNOT circuit notice GEN CIRVIS communications instructions for re­ porting vital intelligence sightings ATC CIT near or over large towns ICAO CIV civil ICAO CK check ICAO CKT circuit GEN CL centre line ICAO CL closing station GEN CL course line ATC CLA clear type of ice formation ICAO CLB climb ATC CLBI climb immediately ATC CLBN crash locator beacon GEN CLBR calibration ICAO CLD cloud NWS CLG calling ICAO CLKOB clockwise orbit ATC CLKWS clockwise GEN CLN colon GEN CLNC clearance GEN CLODA closing date GEN CLOTO close this office GEN CLR clear NWS CLRAP cleared as planned ATC CLRS clear and smooth NWS CLSD closed ICAO CLST celestial ATC CLU circuit line up GEN CM centimeter ICAO CMA comma GEN CMB climb to or climbing to ICAO CMNC commence GEN CMPCT compact GEN CMPL complete or completed or completion ICAO CMPLT complete GEN CMPLX complex GEN CMPSN composition GEN CMPT component GEN CMS construction maintenance supervisor GEN CMSN commission GEN CNCL cancel NWS CNCNT concurrently GEN CNCT connect GEN CNDN Canadian NWS CNL cancel GEN CNLFP cancel flight plan ATC CNS communications, navigation and surveillance ICAO CNS Consolidated NOTAM System ATC CNSTNT consistent GEN Contraction Definition Usage CNTR center GEN CNTRL central GEN CNTRLN centerline GEN CNVG converge GEN CNVRT convert GEN CNVSN conversion GEN CNVTV convective NWS CO company GEN CO county GEN COB close of business GEN COC climb on course ATC COLL collect GEN COM communication ICAO COMB combine GEN COML commercial GEN COMLO compass locator GEN COMPR compare GEN COMPRT compartment GEN CONC concrete ICAO CONCA continue calling until ATC COND condition GEN CONF confidential GEN CONFDC confidence NWS CONFIG configuration ATC CONFIGN configuration GEN CONR Continental NORAD Region GEN CONS continuous ICAO CONSO CONSOLAN Facility GEN CONSOL consol beacon GEN CONSOLAN low or medium frequency long range navigational aid GEN CONST construction ICAO CONT continue(s) or continued ICAO CONTDVD Continental Divide NWS CONTH continue to hold ATC CONTR contract GEN CONTRAILS condensation trails NWS COORD coordinate GEN COORD Coordinates ICAO COP changeover point GEN COPCOM Controllers’ Operations and Procedures Committee GEN COPT completed procedure turn ATC COR correct or corrected or correction GEN CORAS corridor assignment ATC COREQ confirming requisition follows GEN COT at the coast ICAO COV cover ICAO CP circular polarization GEN CPA crash phone activated GEN CPBL capable GEN CPD coupled GEN CPDLC Controller­pilot data link communications ICAO CPF complete power failure GEN CPL current flight plan ICAO CPME Calibration performance monitoring equipment GEN CPN air transport pulse radar navigation aid GEN CPS air transport pulse radar search GEN CPTY capacity GEN CRAD composite radar data processing GEN CRAF civil reserve air fleet GEN CRC circle GEN CRC Cyclic redundancy check ICAO CRCHF crew chief GEN CRLC circulate GEN JO 7340.2E CHG 3 6/25/15 D Contraction Definition Usage CRS course GEN CRT cathode ray tube GEN CRTFY certify GEN CRYPTO cryptographic GEN CRZ cruise ICAO CRZAM cruise and maintain ATC CRZWTR cruise well to right ATC CS Call sign ICAO CS cirrostratus NWS CS/C combined station/center GEN CS/T combined station/tower GEN CSATR climb so as to reach ATC CSATX climb so as to cross ATC CSDR consider GEN CSDRBL considerable GEN CSLDT consolidate GEN CST coast NWS CTA control area ICAO CTAF common traffic advisory frequency ATC CTAM climb to and maintain ATC CTAS controlled airspace ATC CTAX climb to and cross ATC CTC contact ICAO CTCC change to center control or changing to center control ATC CTCC contact center control ATC CTCEN contact center ATC CTGY category NWS CTL control ICAO CTLA control area GEN CTLB control boundary GEN CTLR controller GEN CTLZ control zone GEN CTN caution GEN CTR control zone ICAO CTRAC common terminal radar approach control GEN CTSKLS Catskills NWS CU cumulus NWS CUF cumuliform ICAO CUFRA cumulus fractus NWS CUSNO customs has been notified GEN CUST customs ICAO CVFP cancel VFR flight plan ATC CVINO clearance void if not off ATC CVN convene GEN CVR Cockpit voice recorder ICAO CVR cover GEN CVRS computerized voice reservation system ATC CW continuous wave ICAO CWM change weight manifest GEN CWRC climb well to right of course ATC CWSU center weather service unit GEN CWTR climb well to right ATC CWY clearway ICAO CXA cancel approved arrival ATC CXD cancel approved departure ATC CYC cyclonic NWS CYCLGN cyclogenesis NWS CYL cylinder GEN CZM coastal zone management GEN Contraction Definition Usage D danger area ICAO DA decision altitude ICAO DA departure approved ATC DAAR deviation approved as requested ATC DABRK daybreak NWS DAE district airport engineer GEN DAIRE direct altitude and identification readout equipment GEN DALGT daylight GEN DAP do all possible GEN DAPD descend at pilot’s discretion ATC DASI digital altimeter setting indicator GEN D­ATIS Data link automatic terminal information service ICAO DB decibel GEN DB describe GEN DBA doing business as GEN DBASI digital barometer altimeter setting indicator GEN DBL double GEN DBTF doubtful GEN DC direct current GEN DCA Defense Communications Agency GEN DCAVU clear or scattered clouds and visibility greater than ten, remainder of report missing (weather reports only) NWS DCD double channel duplex ICAO DCF deputy chief GEN DCKG docking ICAO DCLRT decelerate ATC DCM defense combat maneuvers ATC DCMSN decommission GEN DCMT document GEN DCPC Direct controller­pilot communications ICAO DCR decrease GEN DCRZ descend to and cruise ATC DCS defense communications system GEN DCS double channel simplex GEN DCT direct ICAO DDM difference in depth of modulation GEN DE From (used to precede the call sign of the calling station) ICAO DECCO Defense Commercial Communications Office GEN DEF defense GEN DEFCON Defense Readiness Conditions GEN DEG degree ICAO DELPHO deliver by telephone GEN DEMOL demolition GEN DENEB fog dispersal operations ICAO DEP depart ATC DEP departure ICAO DEPT department GEN DER departure end of runway ICAO DES descend to or descending to ICAO DESTN destination GEN Contraction Definition Usage DETRESFA "Distress Phase Code (Alerting Service)" ATC DEV deviation ATC DEW distant early warning GEN DEWIZ distant early warning identification zone GEN DFCLT difficult GEN DFDR Digital flight data recorder ICAO DFL daily flight log GEN DFNT definite GEN DFRS differs GEN DFTI distance from touchdown indicator GEN DFUS diffuse GEN DGCGO dangerous cargo GEN DGNL diagonal GEN DGR danger GEN DH decision height ICAO DI delay indefinite ATC DI departure approval request for IFR flight ATC DIAM diameter GEN DIF diffuse ICAO DIR director GEN DISABLD disabled GEN DISC discontinue GEN DISEM disseminate GEN DIST distance ICAO DIST district GEN DISTR distribute GEN DIV divert ICAO DIV division GEN DKTS Dakotas NWS DLA delay ICAO DLAC delay account of ATC DLAT delay time ATC DLC delay clearance or delayed clearance ATC DLIC Data link initiation capability ICAO DLT delete GEN DLVR deliver GEN DLVY delivery GEN DLY daily GEN DLY Daily ICAO DMAAC Defense Mapping Agency Aerospace Center GEN DMAHC Defense Mapping Agency Hydrographic Center GEN DME distance measuring equipment ICAO DMEG DME­collocated with glide slope GEN DMEL DME­collocated with localizer GEN DMER DME­tactical air navigation with DME only commissioned GEN DMEV DME­collocated with VOR GEN DMG damage GEN DMNT dominant GEN DMO Directives Management Officer, FAA GEN DMSH diminish NWS DMSTN demonstration GEN DNA Defense Nuclear Agency GEN DNG danger ICAO DNS dense NWS DNSLP downslope NWS DNSTRM downstream NWS DNWND downwind ATC DO Deputy Commander for Operations GEN DO ditto GEN DOB date of birth GEN DOC Department of Commerce GEN Contraction Definition Usage DOD Department of Defense GEN DOE Department of Energy GEN DOLLY data link GEN DOM domestic ICAO DOT Department of Transportation GEN DOT­1 Transport One­Secretary of Transportation ATC DOT­2 Transport Two­Deputy Secretary of Transportation ATC DP deep NWS DP dew point temperature ICAO DPCR departure procedure ATC DPNG deepening NWS DPT depth ICAO DPTH depth NWS DR dead reckoning ATC DR direct route GEN DR low drifting METAR DRCT direct GEN DRCTN direction GEN DRDU low drifting dust METAR DRFT drift NWS DRG during ICAO DRIR direct readout infrared GEN DRMS Distance Root Mean Square ATC DRR Deployment Readiness Review ATC DRSA low drifting sand METAR DRSN low drifting snow METAR DRZL drizzle NWS DS domestic services (island operations) GEN DS dust storm METAR DSATR descend so as to reach ATC DSATX descend so as to cross ATC DSB double sideband ICAO DSCNT descent ATC DSGND designated GEN DSIPT dissipate NWS DSN Defense Switching Network GEN DSND descend ATC DSNDI descend immediately ATC DSNT distant GEN DSPL display GEN DSPLC displace GEN DSPN disposition GEN DSPRL dispersal GEN DSR desire GEN DSRGD disregard GEN DST distort GEN DSTC distance GEN DSTND destined ATC DTAM descend to and maintain ATC DTAX descend to and cross ATC DTE data terminal equipment GEN DTF data transmission feature GEN DTG date time group GEN DTHR Displaced runway threshold ICAO DTL detail GEN DTLN international dateline NWS DTR data transmission request GEN DTRM determine GEN DTRT deteriorate NWS DTS Diplomatic Telecommunications Service GEN DTW dual tandem wheels ICAO DU widespread dust METAR DUATS direct user access terminal system GEN DUC dense upper cloud ICAO DUPE duplicate GEN Contraction Definition Usage DUPE "This is a duplicate message (to be used in AFS as a procedure signal)" ICAO DUR duration ICAO DURC during climb ATC DURD during descent ATC DURG during GEN DURN duration GEN DV distinguished visitors GEN DVFR defense VFR GEN DVLP develop GEN D­VOLMET Data link VOLMET ICAO DVOR doppler VHF omni­directional radio range ICAO DVRG diverge GEN DVRSN diversion GEN DVV downward vertical velocity NWS DW dual wheels ICAO DWG drawing GEN DWNDFTS downdrafts NWS DWPNT dew point NWS DWRC descend well to right of course ATC DWTR descend well to right ATC DX duplex GEN DZ drizzle ICAO Contraction Definition Usage EET estimated elapsed time ICAO EFA entire field available GEN EFAS en route flight advisory service GEN EFC expect further clearance at ATC EFCT effect GEN EFF effective GEN EFR expect further routing ATC EFTO encrypt for transmission only GEN EG emergency gear GEN EGECON electronic geographic coordinator navigation system GEN EHA expect higher altitude ATC EHF extremely high frequency (30000 to 300000 MHz) ICAO EIT electronic installation technician GEN ELAT estimated latitude GEN ELBA emergency location beacon ­ aircraft ICAO ELEC electric GEN ELECN electrician GEN ELEV elevate or elevation ICAO ELIP elliptical GEN ELMT electronic mechanic technician GEN ELNGT elongate NWS ELONG estimated longitude GEN ELR extra long range ICAO ELSW elsewhere GEN ELT emergency locator transmitter GEN EM emission ICAO EMBD embedded (in cloud layer) ICAO EMBDD embedded NWS EMDO Engineering and Manufacturing District Office GEN EMERG emergency ICAO EMI electronic maintenance inspector GEN EMSU environment meteorological support unit NWS EMT electronic maintenance technician GEN ENCTR encounter GEN END stop­end (related to RVR) ICAO ENDCE endurance GEN ENDG ending GEN ENE east­north east ICAO ENERN east­northeastern (weather reports only) NWS ENEWD east­northeastward (weather reports only) NWS ENG engine ICAO ENGR engineer GEN ENHNCD enhanced GEN ENHNCMNT enhancement GEN ENR en­route ICAO ENRC En­route chart (followed by name/ title) ICAO ENRT en route GEN ENTR entire GEN EOBT estimated off­block time ICAO EOD entered on duty GEN EOF expected operations forecast NWS EP en route penetration ATC EPI expanded position indicator ATC EQCRT equipment certified GEN EQPT equipment ICAO EQUIP equipment GEN ER here ICAO ERAD en route radar (broadband) GEN ERMG en route metering ATC ERSP en route spacing program ATC E Contraction Definition Usage E east or eastern longitude ICAO E Eastern Standard Time (time groups only) NWS E ending of precipitation (time in minutes) (weather reports only) NWS E equatorial (air mass) NWS E/G engine­generator GEN E/R exchange and repair GEN EACLN expect approach clearance ATC EACNL expect approach clearance not later than ATC EADIZ entering air defense identification zone ATC EARTS en route automated radar tracking system GEN EAS equivalent airspeed ATC EAT expected approach time ATC EB eastbound ICAO EBND eastbound GEN ECA enter control area ATC ECAS enter controlled airspace ATC ECD except change departure to read ATC ECM electronic counter measures GEN ECMSN electronic counter measure mission ATC ECOM en route communications GEN ECR except change route to read ATC ECSP electronic specialist GEN EDA early departure authorized GEN EDC expect departure clearance at ATC EDCT estimated departure clearance (time) ATC EDR expect departure release at ATC EEE Error (to be used in AFS as a procedure signal) ICAO EEM electronic equipment modification GEN EENGR electrical engineer GEN EEP end exercise point GEN 6/25/15 JO 7340.2E CHG 3 F Contraction Definition Usage ERY early GEN ESCAT emergency security control of air traffic GEN ESE east­south east ICAO ESEC en route secondary radar beacon (broadband) GEN ESERN east­southeastern (weather reports only) NWS ESEWD east­southeastward (weather reports only) NWS ESNTL essential GEN ESP en route sequencing program ATC EST estimate or estimation ICAO ESTAB establish GEN ESV expanded service volume GEN ET electronic technician GEN ETA estimated time of arrival GEN ETARS en route tracking automatic radar service ATC ETC et cetera GEN ETD estimated time of departure GEN ETE estimated time en route GEN ETFL each thousand foot level ATC ETI estimated information ATC ETIM elapsed time ATC ETO estimated time over significant point ICAO ETOV estimated time over ATC ETP estimated time of penetration ATC ETR eastern test range ATC EU electronic unit GEN EUO emergency use only GEN EV every ICAO EVAC evacuation GEN EVAL evaluate or evaluation GEN EVE evening GEN EVS electronic voice switching system GEN EVT expect vector to ATC EXAM examination GEN EXC except ICAO EXCH exchange GEN EXCLD exclude GEN EXCLV exclusive GEN EXCP except GEN EXCT execute GEN EXDLVY expedite delivery GEN EXEC executive GEN EXEC­1 President on board civil aircraft GEN EXEC­1F President’s family is aboard aircraft GEN EXEC­2 Vice President is aboard civil aircraft GEN EXEC­2F Vice President’s family is aboard aircraft GEN EXER exercise ICAO EXP expect ICAO EXPC expect GEN EXPED expedite GEN EXPHO expedite delivery by telephone GEN EXPS express GEN EXQF expanded quota flow ATC EXREP expedite mail reply GEN EXSEC extra section GEN EXSHI expedite shipment GEN EXTD extend GEN EXTN extension GEN EXTRAP extrapolate NWS EXTRM extreme NWS EXTSV extensive GEN Contraction Definition Usage F Cleared to fix ATC F fahrenheit GEN F flight inspection GEN FA area forecast NWS FA fuel advisory ATC FA final approach ATC FA CENTER Aviation Area Forecast Center GEN FAA Federal Aviation Administration GEN FAA for an approach to ATC FAA­1 SafeAir One­Federal Aviation Administration Administrator ATC FAA­2 SafeAir Two­Federal Aviation Administration Deputy Administrator ATC FAAP federal aid to airports program GEN FAAR FAA requirements GEN FAC facility GEN FACF facility chief GEN FACSFAC Fleet Area Controlled and Surveillance Facility ATC FAD fuel advisory departure GEN FAF final approach fix ICAO FAFAB FSS assumes flight­plan area and Service B GEN FAH fahrenheit NWS FAL facilitation of international air transport ICAO FAM familiar or familiarization GEN FAMAE following amendment authorized effective GEN FAP final approach point ICAO FAR Federal Aviation Regulations GEN FATFL FSS assumes control of tower frequencies and lights GEN FAX facsimile GEN FBO fixed­base operator GEN FC funnel cloud METAR FCA frequency change approved ATC FCC Federal Communications Commission GEN FCFSS FAA Contract Flight Service Station GEN FCO facility coordination officer GEN FCRP field condition report ATC FCST forecast GEN FCTA flow control time of arrival ATC FCWOS FAA Contract Weather Observing Station GEN FDAT flight data GEN FDC Flight Data Center GEN FDDL frequency division data link GEN FDEP flight data entry and printout ATC FDI Fault Detection and Isolation ATC FDIO flight data input/output ATC FDIOR flight data input/output repeater ATC FDPS Flight data processing system ICAO FE flight engineer GEN FENKN fuel supply unknown ATC FENTL fuel supply until ATC FEW 1 or 2 octas (eighths) cloud coverage METAR FEXHA fuel supply exhausted ATC FFC for further clearance ATC FFLT familiarization flight GEN Contraction Definition Usage FFMN fixed federal monitoring network GEN FFR Fire fighting ICAO FG fog METAR FGSB FSS guarding Service B GEN FI/P flight information (permanent) GEN FI/T flight information (temporary) GEN FIBI filed but impracticable to transmit NWS FIC Flight Information Center GEN FICON field condition GEN FIDO Flight Inspection District Office GEN FIFO Flight Inspection Field Office GEN FIFO­H Flight Inspection Field Office ­ High Altitude GEN FIFP filed IFR flight plan ATC FIG figure GEN FIG flight inspection group GEN FIL filament GEN FILG filling NWS FILS florescan instrument landing system GEN FINO weather report will not be filed for transmission NWS FIR Flight Information Region GEN FIRAV first available GEN FIRB Flight Information Region Boundary GEN FIRG firing GEN FIRIV arrival report will be filed with ATC FIS flight information service GEN FISA automated flight information service ICAO FL flash advisory NWS FL flight level GEN FLCTN fluctuation GEN FLD field ICAO FLDST flood stage NWS FLG falling NWS FLG flashing ICAO FLIDAP flight data position GEN FLIP flight information publication GEN FLORL fluorescent runway lighting (flood­ light system) GEN FLR flares ICAO FLRY flurry NWS FLT flight ICAO FLTCK flight check ICAO FLTO flight orders GEN FLTWO flight watch outlet GEN FLUC fluctuating ICAO FLW follow GEN FLWIS flood warning issued NWS FM fan marker GEN FM from ICAO FMAP fan marker approach ATC FMH fan marker located with radio beacon GEN FMO frequency management officer GEN FMS Flight management system ICAO FMT format GEN FMU flow management unit ICAO FNA final approach ICAO FNCTN function GEN FNT Front NWS FNTGNS frontogenesis NWS FNTLYS frontolysis NWS FOB fuel on board GEN FOD foreign object debris GEN FONE telephone GEN FORNN forenoon NWS FP flight plan GEN FPA flight plan area ATC FPB flight progress board ATC Contraction Definition Usage FPDI flight path deviation indicator GEN FPL filed flight plan ICAO FPL full performance level ATC FPM feet per minute GEN FPN fixed pulse radar navigation aid GEN FPNO flight plan not received GEN FPP from present position ATC FPR flight plan route GEN FPRC for possible reclearance ATC FPWA further particulars when available ATC FQT frequent GEN FR fuel remaining GEN FRC full route clearance GEN FRD fix­radial­distance ATC FREQ frequency ICAO FRFAB FSS returns flight­plan area and Service B GEN FRI Friday ICAO FRH fly runway heading ATC FRM form GEN FRMG forming NWS FRMN formation GEN FRNG firing ICAO FROPA frontal passage NWS FROSFC frontal surface NWS FRQ frequent ICAO FRSB FSS returns Service B GEN FRST frost NWS FRTFL FSS returns control of tower frequencies and lights GEN FRWF forecast wind factor NWS FRZ freeze NWS FRZLVL freezing level NWS FRZN frozen NWS FSDO Flight Standards District Office GEN FSL full stop landing ICAO FSM flight schedule monitor ATC FSNFO Flight Standards National Field Office GEN FSP flight strip printer GEN FSS Flight Service Station ICAO FT feet ICAO FT filing time GEN FT foot GEN FTAR following transmitted as received (message handling) GEN FTHR farther or further GEN FTHRD feathered ATC FTS Federal Telecommunications System GEN FU smoke METAR FURN furnish GEN FV forward visibility (miles) ATC FVFP filed VFR flight plan ATC FW/SIFR fixed wing special IFR GEN FW/SVFR fixed wing special VFR GEN FWA flight watch area GEN FWC Fleet Weather Central NWS FWCS flight watch control station GEN FWD forward GEN FWDC forward collect GEN FWP flight watch point GEN FWRNG fire warning GEN FWS flight watch specialist GEN FWU flight watch unit GEN FYI for your information GEN FZ supercooled/freezing METAR FZDZ freezing drizzle METAR Contraction Definition Usage FZFG freezing fog METAR FZRA freezing rain METAR FZRANO freezing rain sensor not available METAR Contraction Definition Usage GRASS grass landing area ICAO GRBL garble GEN GRBNKS Grand Banks NWS GRDL gradual NWS GRID grid point values of processed meteorological data ICAO GRTLKS Great Lakes NWS GRVL gravel ICAO GS glide slope GEN GS Ground stop ATC GS Ground speed ATC GS snow pellets/small hail (less than 1/4”) METAR GSA General Services Administration GEN GSDO General Safety District Office GEN GSI General safety inspector GEN GSTS Gusts NWS GSTY gusty NWS GTC gain time control ATC GTCL Great Circle GEN GTR greater GEN GUND Geoid undulation ICAO GV ground visibility NWS GVG giving GEN GVH government vehicle GEN GWT gross weight GEN G Contraction Definition Usage G Green ICAO G gusts reaching (knots) (weather reports only) NWS G/A ground to air ICAO G/A/G ground to air and air to ground ICAO GA general aviation GEN GA glide angle GEN GA Go ahead, resume sending (to be used in AFS as a procedure signal) ICAO GADO General Aviation District Office GEN GALS gallons ATC GBA give better address GEN GBAS ground-based augmentation system ICAO GBL government bill of lading GEN GBR give better reference GEN GC ground control GEN GCA ground control approach ICAO GCI ground control intercept GEN GCO ground communication outlet ATC GDP ground delay program ATC GDPGM Ground Delay Program ATC GEN general GEN GENOT general notice GEN GEO geographic GEN GEOREF geographical reference GEN GES ground earth station ICAO GHZ gigahertz GEN GIC GPS Integrity Channel ATC GICG glaze icing NWS GLD glider ICAO GLDR glider GEN GLFALSK Gulf of Alaska NWS GLFCAL Gulf of California NWS GLFMEX Gulf of Mexico NWS GLFSTLAWR Gulf of St. Lawrence NWS GLONASS global navigation satellite system ICAO GLONASS Global orbiting navigation satellite system ICAO GLS GBAS Landing System ICAO GMC Ground movement chart (followed by name/title) ICAO GMT Greenwich Mean Time GEN GND ground ICAO GNDCK ground check ICAO GNDFG ground fog NWS GNSS global navigation satellite system (in general) ICAO GNTR generator GEN GOV Governor GEN GOVT government GEN GP glide path ICAO GPA glide path angle ICAO GPI ground point of intercept ATC GPS global positioning system ICAO GQA get quick answer GEN GR hail (greater than 3/4”) METAR GRAD gradient NWS GRADU gradual ICAO H Contraction Definition Usage H24 continuous 24­hour service ICAO HAA height above airport GEN HADA Hawaiian Defense Area GEN HADD Hawaiian Air Defense Division GEN HADIZ Hawaiian Air Defense Identification Zone GEN HAL height above landing GEN HANG Hawaiian Air National Guard GEN HAPI holding as previously instructed ATC HARS hazardous area reporting service ATC HAT height above touchdown GEN HAZ hazard GEN HAZMAT hazardous material ICAO HB homing beacon ATC HBN hazard beacon ICAO HCVIS high clouds visible NWS HDATZ high density traffic zones ATC HDF high frequency direction finding station ICAO HDFRZ hard freeze NWS HDG heading ICAO HDOP Horizontal Dilution of Precision ATC HDSVLY Hudson Valley NWS HDTA high density traffic airport GEN HDWND headwind ATC HEAD Head of State status ICAO HEL helicopter ICAO HELI heliport GEN HF high frequency GEN HFR hold for release ATC HGT height GEN HHE household effects GEN HI high NWS HIALS high intensity approach light system GEN HIBAL high altitude balloon GEN JO 7340.2E CHG 3 6/25/15 I Contraction Definition Usage HIEAT "highest temperature equaled for all time" NWS HIEFM highest temperature equaled for the month NWS HIESE highest temperature equaled so early NWS HIESL highest temperature equaled so late NWS HIFOR high level forecast NWS HIRIV how will arrival report be filed concerning ATC HIRL high intensity runway lights GEN HITMP highest temperature NWS HIWAS hazardous inflight weather advisory service GEN HIXAT highest temperature exceeded for all time NWS HIXFM highest temperature exceeded for the month NWS HIXSE highest temperature exceeded so early NWS HIXSL highest temperature exceeded so late NWS HJ sunrise to sunset ICAO HLDG holding ICAO HLF half GEN HLSTO hailstones NWS HLTP hilltop NWS HN sunset to sunrise ICAO HND hundred GEN HNGR hangar GEN HO service available to meet operational requirements ICAO HOL holiday GEN HOP handoff point ATC HOP helicopter operations GEN HOSP hospital aircraft ICAO HOW handover word ATC HP holding pattern GEN HPA hectopascal ICAO HQ headquarters GEN HR here GEN HR hour ICAO HRZN horizon GEN HS service available during scheduled operations ICAO HTN heterodyne GEN HTR heater GEN HUM humanitarian mission ICAO HURCN hurricane NWS HUREP hurricane report NWS HV high voltage GEN HVDF high and very high frequency direction finding stations ICAO HVY heavy ICAO HWVR however GEN HWY highway GEN HX high index NWS HX no specific working hours ICAO HYD hydraulic GEN HYDRO hydrographic GEN HYR higher ICAO HZ haze METAR Hz hertz GEN Contraction Definition Usage I/IFR intermittent instruments ATC IAARC International Administrative Aero­ nautical Radio Conference GEN IAATCD if authorized by ATC, DME may be used ATC IAC instrument approach chart (followed by name/title) ICAO IAF initial approach fix ICAO IAO in and out of clouds ICAO IAP instrument approach procedure ICAO IAR intersection of air routes ICAO IAS indicated air speed ATC IATA International Air Transport Association GEN IATSC International Aeronautical Tele­ communications Switching Center GEN IAW in accordance with GEN IBASF intervals between aircraft in stream type formation ATC IBN identification beacon ICAO IBND inbound ATC IC ice crystals (weather reports only) METAR IC icing (PIREP only) ATC ICAO International Civil Aviation Organization GEN ICD Interface Control Document ATC ICG icing NWS ICGIC icing in clouds NWS ICGICIP icing in clouds and precipitation NWS ICGIP icing in precipitation NWS ID identify or identifier ICAO IDAT interfacility data GEN IDENT identification ICAO IDP individual development plan GEN IF intermediate approach fix ICAO IF intermediate fix GEN IFAMP if approach missed proceed ATC IFF identification friend/foe ICAO IFHOL if holding ATC IFIM International Flight Information Manual GEN IFINS if instrument conditions encountered ATC IFO International Field Office GEN IFO interphone GEN IFONO interphone (service F) not operative GEN IFORO interphone (service F) resumed operation GEN IFPFP individual flight plans from this point ATC IFR instrument flight rules ICAO IFSS International Flight Service Station GEN IFUN if unable GEN IFVLS if flight visibility becomes less than ATC IFVR if visibility remains ATC IGA international general aviation ICAO IGIA Interagency Group on International Aviation GEN IIA if incorrect advise GEN IISD if incorrect service direct GEN Contraction Definition Usage ILAS instrument low approach ATC ILS instrument landing system GEN ILSP ILS­partial GEN IM inner marker ICAO IMAP immediately after passing ATC IMC instrument meteorological conditions GEN IMDT immediate NWS IMF interrogation sign GEN IMG immigration ICAO IMI Intensity unknown (weather reports only) ICAO IMP impracticable GEN IMPL impulse GEN IMPR improve ICAO IMPT important GEN IMT immediate or immediately GEN IN inch ICAO INA initial approach ICAO INADQT inadequate GEN INATS interruption of air traffic services GEN INBD inbound ICAO INC in clouds ICAO INC incorporated GEN INCERFA uncertainty phase code (alerting service) ATC INCL include GEN INCLV inclusive GEN INCOMP incomplete GEN INCOR incorrect GEN INCR increase GEN INDC indicate GEN INDEF indefinite GEN INDUS industrial GEN INF inland navigation facility GEN INFO information GEN INIT initial training GEN INLD inland NWS INOF if not off GEN INOP inoperative ICAO INP if not possible GEN INPR in progress ICAO INREQ information request GEN INS inertial navigation system ICAO INSP inspect GEN INST instrument GEN INSTA instruments authorized ATC INSTA interstate GEN INSTBY instability NWS INSTL install GEN INSTR instruct GEN INSTR instrument ICAO INSUF insufficient scheduled time available GEN INSUF unable to finish GEN INT intersection ICAO INTCNTL intercontinental GEN INTCP intercept GEN INTD intend GEN INTER intermittent ICAO INTFC interference GEN INTL international ICAO INTMD intermediate GEN INTMT intermittent GEN INTNS intentions GEN INTR interior NWS Contraction Definition Usage INTRG interrogator ICAO INTRMTRGN Inter­Mountain Region NWS INTRP interrupt GEN INTS intense NWS INTSF intensify or intensifying ICAO INTSFY intensify NWS INTST intensity ICAO INTVL interval GEN INTXN intersection GEN INVES investigate GEN INVOF in the vicinity of ATC INVRN inversion NWS INVSTAR investigate and report GEN IOVC in overcast NWS IP initial point ATC IP instructor pilot GEN IP/HHCL initial point/H­hour control line ATC IPV improve GEN IR ice on runway NWS IR IFR military training route GEN IRAC Interdepartmental Radio Advisory Committee GEN IRAD inbound radial ATC IREG irregular GEN IRN Interface Revision Notices ATC IS island GEN ISA international standard atmosphere ICAO ISB independent sideband ICAO ISMGR Island Manager GEN ISMLS interim standard microwave landing system GEN ISOL isolate GEN ITCK issue time check ATC ITNRNT itinerant GEN ITRY itinerary GEN ITU International Telecommunications Union GEN IVFRC in VFR conditions ATC J Contraction Definition Usage JAL jet approach landing charts GEN JATO jet assisted take­off ATC JAWYS join airways ATC J­BAR jet runway barrier ATC JCTN junction GEN JOUR journeyman GEN JP jet penetration ATC JPAP jet penetration approach ATC JTST jet stream ICAO JTSTR jet stream NWS K Contraction Definition Usage K Cold (air mass) NWS KC kilocycles GEN KEPOA keep this office advised GEN KFRST killing frost NWS KG kilogram GEN KHZ kilohertz GEN Contraction Definition Usage KIAS knots indicated airspeed GEN KM kilometers GEN KMH kilometers per hour ICAO KPA kilopascal ICAO KT knots GEN KW kilowatt GEN Contraction Definition Usage LLWS low level wind shear GEN LLZ localizer ICAO LM locator middle ICAO LMM compass locator at ILS middle marker GEN LMT limit GEN LMT Local Mean Time ICAO LN line GEN LNAV lateral navigation (from TERPS­A1) GEN LND Land GEN LNDG landing GEN LO liaison officer GEN LO outer locator ICAO LOA letter of agreement GEN LOC localizer ICAO LOCOR local coordinator GEN LODISNAV long distance navigation GEN LOEAT lowest temperature equaled for all time NWS LOEFM lowest temperature equaled for the month NWS LOESE lowest temperature equaled so early NWS LOESL lowest temperature equaled so late NWS LOM compass locator at ILS outer marker GEN LONG longitude ICAO LONGL longitudinal GEN LOP line of position GEN LORAC long range accuracy GEN LORAN long range air navigation system GEN LOTMP lowest temperature NWS LOXAT lowest temperature exceeded for all time NWS LOXFM lowest temperature exceeded for the month NWS LOXSE lowest temperature exceeded so early NWS LOXSL lowest temperature exceeded so late NWS LP left traffic pattern ATC LP linear polarization ATC LP liquid propane GEN LP localizer performance without vertical guidance GEN LPV localizer performance with vertical guidance ICAO LR "The last message received by me was …." ICAO LRA landing rights airport GEN LRCOM long range VHF/UHF communications GEN LRG large GEN LRG long range GEN LRS lake reporting service GEN LS left side ATC LS "The last message sent by me was …or last message was …" ICAO LSQ line squall ICAO LSR loose snow on runway NWS LST Local Standard Time GEN LT turn left after take­off ATC LTAV light and variable GEN LTD limited ICAO LTF local training flight ATC LTFC landing traffic ATC LTGCA lightning cloud­to­air NWS LTGCC lightning cloud­to­cloud NWS LTGCCCG lightning cloud­to­cloud, cloud to ground NWS LTGCG lightning cloud­to­ground NWS L Contraction Definition Usage L Left ICAO L Locator ICAO L Logistics GEN L/MF low/medium frequency GEN LA low approach ATC LAA local airport advisory GEN LAADR low altitude arrival/departure routing ATC LAAS Local Area Augmentation System ATC LAB laboratory GEN LABRDR labrador NWS LABS leased Service A/B system ATC LABS low altitude bombing system GEN LADP local airport deicing plan ATC LAM logical acknowledgement ICAO LAN inland ICAO LARCT last radio contact ATC LAT latitude ICAO LAWRS Limited Aviation Weather Reporting Station GEN LB left base ATC LB pounds (weight) GEN LC local control GEN LCA locally ICAO LCL local or locally GEN LCT locate GEN LCTMP little change in temperature NWS LD long distance GEN LDA landing distance available ICAO LDA localizer type directional aid ATC LDG landing ICAO LDI landing direction indicator ICAO LDIN lead in lighting system GEN LEN length ICAO LETFO letter follows GEN LF low frequency GEN LFC laminar flow control GEN LFNT low frequency intersection GEN LFR low frequency radio range GEN LFT lift NWS LGRNG long range NWS LGT light or lighting ICAO LGTD lighted ICAO LGWV long wave GEN LICOF land lines communications facilities GEN LIFR low IFR (weather reports only) NWS LIH light intensity high ICAO LIL light intensity low ICAO LIM light intensity medium ICAO LIN linearity GEN LIRL low intensity runway edge lights GEN LK lake NWS LKLY likely GEN LKTYP like type ATC LL landline GEN LLWAS low level wind shear alert system GEN Contraction Definition Usage LTGCW lightning cloud­to­water NWS LTGIC lightning in clouds NWS LTL little GEN LTLCG little change NWS LTNG lightning NWS LTR later GEN LTR letter GEN LTT landline teletypewriter ICAO LTTR latter GEN LV leaving GEN LV light and variable ICAO LVE leave or leaving ICAO LVG leaving ATC LVL level ATC LVO low visibility operations GEN LVLOF level off ATC LWR lower GEN LX low index NWS LYR layer or layered or layers NWS Contraction Definition Usage MAPS "Meteorological Aeronautical Presentation System" GEN MAPT missed approach point ICAO MAR at sea ICAO MARPT municipal airport GEN MARSA military assumes responsibility for separation of aircraft GEN MAS manual A1 simplex ICAO MAS military alert system GEN MAX maximum GEN MB marker beacon GEN MB millibars GEN MCA minimum crossing altitude ICAO MCAS Marine Corps Air Station GEN MCAS(H) Marine Corps Air Station (Helicopter) GEN MCK maintenance check GEN MCS Master Control Station ATC MCW modulated continuous wave ICAO MCZNE minimum when control zone effective GEN MDA minimum descent altitude ICAO MDF medium frequency direction finding station ICAO MDFR make descent from ATC MDFY modify GEN MDH minimum descent height ICAO MDT moderate GEN MDZ modernize GEN MDZN modernization GEN MEA minimum en route altitude ICAO MECH mechanic GEN MED medical GEN MED medium GEN MEDEVAC medical emergency evacuation ICAO MEGG merging NWS MEHT minimum eye height over threshold ICAO MEML memorial GEN MET meteorological GEN METAR aviation routine weather report ICAO METOF meteorological officer GEN METRO metropolitan GEN MEX Mexico NWS MF medium frequency GEN MFL maintain flight level ATC MFOB minimum fuel on board ATC MFPOF master flight plan on file ATC MFS military flight service GEN MFV forward visibility more than (miles) ATC MFXT meter fix time ATC MGAT make good a track of (degrees) ATC MGMT make good a magnetic track of (degrees) ATC MGMT management GEN MGR manager GEN MHA minimum holding altitude GEN MHDF medium and high frequency direc­ tion­finding station (same location) ICAO MHDG magnetic heading GEN MHFR military height finder radar GEN MHKVLY Mohawk Valley NWS MHVDF medium high and very high frequency direction­finding station (same location) ICAO MHz megahertz GEN MI manufacturing inspector GEN MI mile GEN MI shallow METAR M Contraction Definition Usage M "in RVR indicates visibility less than lowest reportable sensor value (e.g. M600)" METAR M in temperature field means “minus” or below zero METAR M Mach number GEN M maritime (air mass) NWS M metres (preceded by figures) ICAO M missing (weather reports only) NWS M Mountain Standard Time (time groups only) NWS MA map analysis NWS MAA maximum authorized (IFR) altitude GEN MAC Military Airlift Command GEN MACH MACH Number (speed ratio to speed of sound) ATC MACKAY Mackay Radio and Telegraph Company GEN MACVFR make altitude changes VFR ATC MAFAP minimum altitude over facility on final approach course ATC MAG magnetic GEN MAGSI minimum altitude at glide slope intersection inbound GEN MAINT maintenance ICAO MAL maintain at least (altitude) ATC MALS medium intensity approach lighting system GEN MALSF medium intensity approach lighting system with sequenced flashers GEN MALSR medium intensity approach lighting system with runway alignment indicator lights GEN MAM maintenance assumes monitor GEN MAN Manitoba NWS MAN manual GEN MANAM manual amendment GEN MANOP manual of operations GEN MAP aeronautical maps and charts ICAO MAP missed approach point GEN Contraction Definition Usage MID middle GEN MID mid­point (related to RVR) ICAO MID/ASIA ICAO Middle East/Asia Region ATC MIDIZ Mid­Canada Identification Zone GEN MIDN midnight NWS MIDPT midpoint GEN MIFG patches of shallow fog not deeper than two meters NWS MIFG shallow fog METAR MIJI meaconing, intrusion, jamming, interference ATC MIL military ICAO MIMNO mimeographic notice GEN MIN minute ICAO MINIT minutes in trail ATC MIREQ minimum requirements specified GEN MIRL medium intensity runway edge lights GEN MIS Missing …(transmission identification) ICAO MISC miscellaneous GEN MISG missing GEN MISL missile GEN MIT miles in trail ATC MITO minimum interval take­off ATC MKCT make check turn ATC MKD marked GEN MKR marker GEN MKR marker radio beacon ICAO MLS microwave landing system GEN MLTLVL melting level NWS MM middle marker ICAO MM millimeter GEN MMACH maintain Mach ATC MMO main meteorological office NWS MNLD mainland NWS MNLY mainly GEN MNM minimum ICAO MNPS minimum navigation performance specification ATC MNPSA minimum navigation performance specification airspace ATC MNT monitor ICAO MNTN maintain ICAO MNVR maneuver GEN MOA memorandum of agreement GEN MOA military operations area ICAO MOC minimum obstacle clearance (required) ICAO MOCA minimum obstruction clearance altitude ICAO MOD moderate GEN MOD modulate or modulation or modulator GEN MOGR moderate or greater NWS MON above mountains ICAO MON Monday ICAO MONOK monitor resumed normal operation GEN MONOS monitor out of service GEN MONTR monitor NWS MOPS Minimum operational performance standards ICAO MOPTAR multi­object phase tracking and ranging GEN MOREPS monitor station reports GEN MOT Ministry of Transport (Canada) GEN MOTNE Meteorological Operational Tele­ communications Network Europe ICAO MOV move NWS MPH miles per hour GEN Contraction Definition Usage MPP Merit Promotion Program GEN MPS meters per second ICAO MPVA maintain a position VFR and advise ATC MRA minimum reception altitude GEN MRG medium range GEN MRGL marginal NWS MRM maintenance returns monitor GEN MRNG morning NWS MRP ATS/MET reporting point ICAO MRR mechanical reliability report GEN MRTM maritime NWS MRU Military Radar Unit GEN MS minus NWS MSA minimum safe/sector altitude GEN MSAW minimum safe altitude warning GEN MSG message ICAO MSGCTR message center GEN MSL mean sea level ICAO MSR Message …(transmission identific­ ation) has been misrouted ICAO MSSR Monopulse secondary surveillance radar ICAO MSTLY mostly NWS MSTR moisture NWS MT mountain ICAO MTCA minimum terrain clearance altitude GEN MTI moving target indicator ATC MTN mountain NWS MTR military training route GEN MTRL material GEN MTRY momentary GEN MTU metric units ICAO MTW mountain wave ICAO MU designate a friction value represent­ ing runway surface conditions (Greek letter) GEN MUA maximum usable altitude GEN MUF maximum usable frequency GEN MULT multiple GEN MUNI municipal GEN MV millivolt GEN MVA minimum vector altitude GEN MVDF medium and very high frequency direction­finding station (same location) ICAO MVFR maintain VFR ATC MVFR marginal VFR NWS MVSP maintain visual separation ATC MWO Meteorological Watch Office ICAO MWRC maintain well to right of course ATC MWTCS modernized weather teletypewriter communications system GEN MXD mixed NWS N Contraction Definition Usage N north or northern latitude ICAO N/A not applicable GEN NA not authorized GEN NAAS Naval Auxiliary Air Station GEN NAATS National Association of Air Traffic Control Specialists GEN NAB not above GEN NACOS national communications schedule GEN NADIN National Airspace Data Interchange Network GEN NAF Naval Air Facility GEN Contraction Definition Usage NAFEC "National Aviation Facilities Experimental Center" GEN NANAC National Aircraft Noise Abatement Council GEN NAP not at present GEN NAPRS National Airspace Performance Reporting System ATC NAR North American Route GEN NAR not according to routine GEN NAS National Airspace System GEN NAS Naval Air Station GEN NASA National Aeronautics and Space Administration GEN NASC National AIS system centre ICAO NASEO National Airways System Engineering office GEN NASP National Airport System Plan GEN NAT North Atlantic GEN NAT not ARTS tracked ATC NATCA National Air Traffic Controllers Association ATC NATCAS Navigation, ATC, and Collision Avoidance System GEN NATCC National Air Transport Coordinating Committee GEN NATCOM National Communications Center GEN NATL national GEN NATR no additional traffic reported ATC NATS noise abatement test system GEN NAV navigation ICAO NAVAID navigational aid GEN NAVLO Navy Liaison Officer GEN NAVREP Navy Representative to the FAA GEN NB New Brunswick NWS NB northbound ICAO NBCAP national beacon code allocation plan GEN NBFR not before ICAO NBND northbound GEN NBRHD neighborhood GEN NC no change GEN NCDC National Climatic Data Center GEN NCE no change in estimates ATC NCS National Communications System GEN NCWX no change in weather NWS NDB nondirectional radio beacon ICAO NDB/DME NDB and DME (collocated) GEN NDBLO not to descend below ATC NE north­east ICAO NEB north­eastbound ICAO NEC necessary GEN NEF no further clearance required ATC NEG negative GEN NELY northeasterly (weather reports only) NWS NERN northeastern NWS NESS national environmental satellite service GEN NETR no essential traffic reported ATC NEW ENG New England NWS NFDC National Flight Data Center GEN NFDD National Flight Data Digest GEN NFLD Newfoundland NWS NFQ night frequency GEN NFT no filing time GEN NFU not for us GEN NG National Guard GEN NGT night ICAO NHD not heard ATC Contraction Definition Usage NICS "National Airspace System Interfa­ cility Communications System" GEN NIL none GEN NIL unable to transmit GEN NIS not in system GEN NL no layers NWS NLT not later than GEN NM nautical mile ICAO NMBR number NWS NMC National Meteorological Center GEN NML normal GEN NMN no middle name GEN NMR nautical mile radius GEN NMRS numerous GEN NNE north­north east ICAO NNERN north­northeastern (weather reports only) NWS NNEWD north­northeastward (weather reports only) NWS NNW north­north west ICAO NNWRN north­northwestern (weather reports only) NWS NNWWD north­westward (weather reports only) NWS NO No (negative) ICAO NO not available METAR NOAA National Oceanic and Atmospheric Administration GEN NOAC no action necessary GEN NOF NOTAM Office GEN NOFIN no further information GEN NOHOL not holding ATC NOIFN no information GEN NOMAD Naval Oceanographic Meteorolo­ gical Automatic Device GEN NONEG negative replies not required GEN NONRVSM non-RVSM capable flight ICAO NOPAC North Pacific ATC NOPAR do not pass to Air Defense radar ATC NOPT no procedure turn required GEN NORAC no radio contact ATC NORAD North American Aerospace Defense Command GEN NORDO no radio GEN NOREC no record GEN NOREP no report GEN NORIV no arrival report ATC NORPI no pilot balloon observation will be filed next collection unless weather changes significantly NWS NORR no reply received GEN NORST no restrictions GEN NOS National Ocean Service GEN NOSI now simultaneous GEN NOSIG no significant change ICAO NOSPL no special observations taken (weather reports only) NWS NOSUM NOTAM Summary GEN NOTAM Notice to Airmen ICAO NOZ normal operating zone GEN NOZ Normal operating zone ICAO NPI nonprecision instrument GEN NPRL no parallel traffic ATC NPRM Notice of Proposed Rulemaking ATC NPRS nonpersistent NWS NR near GEN NR number GEN NRAB Naval Reserve Air Base GEN JO 7340.2E 7/24/14 Contraction Definition Usage NRD no record of destination GEN NRH no reply heard ICAO NRP North American route program ATC NRV nonrevenue GEN NRW narrow GEN NS nimbostratus NWS NS Nova Scotia NWS NSC no significant cloud ICAO NSC Nonstandard C/A Code ATC NSCSWD no small craft or storm warning are being displayed NWS NSP nonstandard holding pattern GEN NSSFC National Severe Storm Forecast Center GEN NSTP nonstop GEN NSW no significant weather METAR NTAP National Track Analysis Program ATC NTAP Notices To Airmen Publication ATC NTE not to exceed GEN NTFND no trouble found GEN NTFY notify GEN NTL National ICAO NTO name to GEN NTRP no traffic reported ATC NTSB National Transportation Safety Board GEN NTZ no transgression zone ATC NTZ No transgression zone ICAO NUDET nuclear detonation GEN NVA negative vorticity advection NWS NW north­west ICAO NWB north­westbound ICAO NWLY northwesterly (weather reports only) NWS NWRN northwestern (weather reports only) NWS NWS National Weather Service GEN NWSO Naval Weather Service Office GEN NXT next GEN Contraction Definition Usage OCAS out of controlled airspace ATC OCFNT occluded front NWS OCH obstacle clearance height ICAO OCL obstacle clearance limit ICAO OCLD occlude NWS OCLN occlusion NWS OCNL occasional GEN OCR occur GEN OCS obstacle clearance surface ICAO OCTLA out of control area ATC ODALS omnidirectional approach lighting system GEN ODAPS Oceanic Display and Planning System ATC OFAS overseas flight assistance service GEN OFC office GEN OFFL official GEN OFM out for maintenance GEN OFP occluded frontal passage NWS OFP original flight plan GEN OFSHR offshore NWS OFW off watch GEN OFXT outer fix time ATC OFZ Obstacle free zone ICAO OG on ground ATC OGN Originate ICAO OHD overhead ICAO OI on instruments ATC OINT omni intersection GEN OIS operational information system ATC OJT on­the­job training GEN OK operating normally GEN OK We agree or it is correct ICAO OLDI On line data interchange ICAO OLS optical landing system ATC OM outer marker ICAO OMSG our message GEN OMTNS over mountains NWS ONER oceanic navigational error report ATC ONSHR on shore NWS ONT Ontario NWS ONW on watch GEN OOT out of tolerance GEN OPA opaque, white type of ice formation ICAO OPC operational control ICAO OPDT opposite direction traffic GEN OPER operate GEN OPMET operational meteorological (information) ICAO OPN open ICAO OPN operation GEN OPNML operations normal GEN OPR operate, operator, operational ICAO OPS operations ICAO OPSNET operations network ATC ORD order, indication of ICAO ORGPHC orographic NWS ORIG original GEN ORL overrun lights GEN ORS over range station ATC OSV ocean station vessel NWS OT on time ATC OTAS on top and smooth NWS OTFC overflight traffic GEN OTLK outlook NWS OTP on top ATC OTR other GEN OTRW otherwise GEN O Contraction Definition Usage O/F on file GEN O/R on request GEN O/T overtime GEN OA overhead approach ATC OAC oceanic area control GEN OAG Official Airline Guide GEN OANDR operation and regulation GEN OAOI on and off instruments ATC OARTS oceanic air route tracking system GEN OAS obstacle assessment surface ICAO OAT outside air temperature GEN OB on board GEN OBL obliterate GEN OBND outbound ATC OBS observation NWS OBSC obscure, obscured, or obscuring ICAO OBST obstacle ICAO OBST obstruct GEN OBSTN obstruction GEN OC obstruction chart GEN OC on course ATC OCA obstacle clearance altitude ICAO OCA oceanic control area ICAO OCAC oceanic ATC GEN Contraction Definition Usage OTS organized track system GEN OTS out of service GEN OUBD outbound ICAO OV location (PIREP only) ATC OVC overcast NWS OVD overdue GEN OVHD overhead GEN OVLA overlay GEN OVNGT overnight GEN OVR over GEN OVRN overrun GEN OVSEA overseas GEN OVTK overtake GEN OW one way GEN OWF optimum working frequency GEN OXY oxygen GEN Contraction Definition Usage PCS permanent change of station GEN PD period GEN PDAR preferential arrival/departure route (Stage A) GEN PDC Pre­departure clearance ICAO PDDC proceed directly on course ATC PDMT predominant NWS PDMT predominate NWS PDOP Position Dilution of Precision ATC PDR preferential departure route (Stage A) GEN PDW priority delayed weather NWS PEN peninsula NWS PENT penetrate or penetration ATC PER performance ICAO PERCOM peripheral communications GEN PERF perforator GEN PERM permanent ICAO PFSV pilot to forecaster service GEN PGTSND Puget Sound NWS PHYS physical GEN PIB Pre­flight information bulletin ICAO PIBAL pilot balloon observation NWS PIC pilot in command GEN PIR precision instrument runway GEN PIREP pilot weather report GEN PIRFC pilot requests forecast GEN PISE no pilot balloon observation due to unfavorable sea conditions NWS PISO no pilot balloon observation due to snow NWS PIT pilot instructor training GEN PIWI no pilot balloon observation due to high, or gusty, surface wind NWS PJE parachute jumping exercise ICAO PK WND peak wind (weather reports only) NWS PL ice pellets METAR PLA practice low approach ICAO PLASI pulsating visual approach slope indicators ATC PLAT present latitude ATC PLF private line telephone GEN PLN flight plan ICAO PLOB place of birth GEN PLONG present longitude ATC PLS please GEN PLT private line teletypewriter GEN PLVL present level ICAO PLW plow (snow) NWS PM post meridiem GEN PMSN permission GEN PMT permit GEN PN prior notice required ICAO PNHDL panhandle NWS PNR point of no return ATC PO dust devils METAR PO post office GEN PO purchase order GEN POA privately owned aircraft GEN POB persons on board ICAO POC proceed or proceeding on course ATC POS positive GEN POSS possible ICAO POV privately owned vehicle GEN PP pay period (number) GEN PPI plan position indicator ICAO PPINA radar weather report not available (or omitted for a reason different than those otherwise stated) NWS P Contraction Definition Usage P "in RVR indicates visibility greater than highest reportable sensor value (e.g. P600FT)" METAR P Pacific Standard Time (time group only) NWS P polar (air mass) NWS P prohibited area ICAO P/CG pilot controller glossary GEN P6SM visibility greater than 6 SM (TAF only) METAR PA precision approach GEN PA pressure altitude GEN PAC Pacific NWS PACF parent FSS assumes control of part­time FSS GEN PADRA pass to air defense radar ATC PAEW personnel and equipment working GEN PAJA parachute jumping activities GEN PALS precision approach lighting system ICAO PALT present altitude ATC PANS procedures for air navigation services ICAO PAPI precision approach path indicator ICAO PAR precision approach radar ICAO PARA paragraph GEN PAREN parenthesis GEN PARL parallel ICAO PARROT Transponder GEN PARROT Position adjustable range reference orientation transponder ATC PAT pattern GEN PATC Precision approach terrain chart ICAO PATWAS pilots automatic telephone weather answering service GEN PAU present address unknown GEN PAX passenger ICAO PBCT proposed boundary crossing time GEN PBL probable NWS PBS public buildings service GEN PCA positive control area GEN PCD proceed ICAO PCK pilot check ATC PCL pilot controlled lighting GEN PCL Pilot controlled lighting ICAO PCN pavement classification number ICAO PCPN precipitation NWS Contraction Definition Usage PPINE "radar weather report no echoes observed" NWS PPINO radar weather report equipment inoperative due to breakdown NWS PPIOK radar weather report equipment operation resumed NWS PPIOM radar weather report equipment inoperative due to maintenance NWS PPR prior permission required ICAO PPS propose GEN PPSN present position ATC PR partial METAR PR photo reconnaissance GEN PRBL probable GEN PRBLTY probability NWS PRBO position relief briefing observed ATC PRCF parent FSS returns control of part­time FSS GEN PRCHT parachute GEN PRCTN precaution GEN PRECD precede GEN PREF preferred ATC PRES pressure GEN PRESFR pressure falling rapidly NWS PRESRR pressure rising rapidly NWS PREV previous GEN PRFG fog partial METAR PRI primary ICAO PRIM primary GEN PRIN principal GEN PRIND present indications are GEN PRIRA primary radar GEN PRJMP pressure jump (weather reports only) NWS PRKG parking ICAO PRN pseudo random noise GEN PROB probability ICAO PROB30 slight chance METAR PROB40 probability 40 percent METAR PROC procedure ICAO PROCD proceed GEN PROG prognosis or prognostic NWS PROG progress GEN PROP propeller GEN PROPA propagation GEN PROSIG procedure signal GEN PROV provisional ICAO PRP prepare GEN PRSNT present NWS PRST persist GEN PRVD provide GEN PS passenger service GEN PS plus NWS PSBL possible GEN PSBT pilot self­briefing terminal GEN PSG passage NWS PSG passing NWS PSGR passenger GEN PSN position ICAO PSNAL personal GEN PSNL personnel GEN PSNRP position report ATC PSP pierced steel planking ICAO PSR packed snow on runway NWS PSR Primary surveillance radar ICAO PSRI position subject to return of incumbent GEN PSRS position subject to rotating shifts GEN PST Pacific Standard Time GEN Contraction Definition Usage PT procedure turn GEN PTC plan to clear ATC PTC positive target control ATC PTCHY patchy NWS PTCP participate GEN PTLY partly NWS PTN portion GEN PTN procedure turn ICAO PTP point­to­point ATC PTR printer GEN PTS polar track structure ICAO PUB public GEN PUBL publish GEN PUP pickup GEN PVA positive vorticity advection NWS PVASI pulsating/steady visual approach slope indicator GEN PVL prevail GEN PVLT prevalent GEN PVT private GEN PWB pilot weather briefing GEN PWI proximity warning indicator ATC PWINO precipitation identifier information not available (weather reports only) NWS PWR power GEN PWRNO power failure GEN PWROK power restored GEN PY spray METAR Q Contraction Definition Usage QDL "Do you intend to ask me for a series of bearings? Or I intend to ask you for a series of bearings" ICAO QDM magnetic heading ICAO QDR magnetic bearing ICAO QFE atmospheric pressure at airport elevation ICAO QFLOW quota flow control procedures GEN QFU magnetic orientation of runway ICAO QGE What is my distance to your station or Tour distance to my station is … ICAO QJH Shall I run my test tape/a test sentence ICAO QLFY qualify GEN QLTY quality GEN QN question GEN QNH altimeter sub­scale setting to obtain elevation when on the ground ICAO QNTY quantity GEN QSP Will you relay to …free of charge or I will relay to…free of charge ICAO QSTNRY quasistationary NWS QTA Shall I cancel telegram number …? Or cancel telegram number … ICAO QTE true bearing ICAO QTF "Will you give me the position of my station according to the bearings taken by the D/F station which you control or the position of your station according to the bearings taken by the D/F stations that I control was …latiude…longitude (or other in­ dication of position), class ....at....hours" ICAO Contraction Definition Usage QTR quarter GEN QUAD quadrant GEN QUE Quebec NWS QUJ Will you indicate the TRUE track to reach you or the TRUE track to reach me is …degrees at …hours ICAO Contraction Definition Usage RARAD radar advisory GEN RAREP radar weather report NWS RASC Regional AIS system centre ICAO RASH rain showers ICAO RASN rain and snow or showers of rain and snow METAR RATCF radar ATC facility (USN) GEN RAVU radiosonde analysis and verification unit NWS RAWE no RAWIN obs., unfavorable weather NWS RAWI no RAWIN obs., high and gusty winds NWS RAWIN upper winds obs. (by radio methods) NWS RAWX returned account weather GEN RB rescue boat ICAO RB right base ATC RBDE radar bright display equipment GEN RBN radio beacon GEN RBOC report back on course ATC RBOF report back on frequency ATC RBS radar bomb scoring GEN RBS PP(RBS+++) ration by schedule plus compression ATC RC reverse course ATC RC road reconnaissance GEN RCA reach cruising altitude ICAO RCADV reverse course and advise ATC RCAG remote communications air/ground facility GEN RCALT reach cruising altitude ATC RCC Rescue Coordination Center GEN RCD radar cloud detection report NWS RCDNA radar cloud detection report not available NWS RCDNE radar cloud detection report no echoes observed NWS RCDNO radar cloud detector inoperative due to breakdown until NWS RCDOM radar cloud detector inoperative due to maintenance until NWS RCF radio communication failure ICAO RCF radiocommunication failure ICAO RCF remain on company frequency ATC RCH reach GEN RCH reach ­ call sign for U.S. AirForce, Air Mobility Command (USAFAMC) MIL RCK radio check ATC RCKY Rockies (mountains) NWS RCL runway center line ICAO RCLL runway center line lights ICAO RCLM runway centerline marking GEN RCLR radio communications link repeater GEN RCLS runway centerline light system GEN RCLT radio communications link terminal GEN RCMD recommend GEN RCN Royal Canadian Navy GEN RCO remote communication outlet GEN RCOM en route communications GEN RCON reconfiguration ATC RCPT receipt GEN RCR runway condition reading GEN RCRD record GEN RCS Rehost Computer System ATC RCV receive GEN RCVNO receiving capability out GEN RDARA regional and domestic air route area GEN R Contraction Definition Usage R "Acknowledgement of receipt (message handling)" GEN R Received (acknowledgement of receipt) ICAO R restricted area (followed by identification) ICAO R right (runway identification) ICAO R runway (used in RVR measurement) METAR R/O receive only GEN R/OC receive, only centers GEN RA rain METAR RAA Remote Airport Advisory ATC RAAF Royal Australian Air Force GEN RABA no RAWIN obs., no balloons available NWS RABAL radiosonde balloon wind data NWS RABAR radiosonde balloon release NWS RAC request altitude change ATC RAC rules of the air and air traffic services ICAO RACE request altitude changes en route ATC RACFI radio and communication facilities inoperative GEN RACO no RAWIN obs., communications out NWS RACON radar responder beacon GEN RADAT radiosonde observation data NWS RADEP radar departure ATC RADNO report missing account radio failure NWS RADON radar beacon GEN RADU weather radar analysis and development unit GEN RAF Royal Air Force GEN RAFC regional area forecast center ICAO RAFI radiosonde observation not filed NWS RAFRZ radiosonde observation freezing levels NWS RAG ragged ICAO RAG runway arresting gear ICAO RAGF remote air­ground facility GEN RAHE no RAWIN obs., no gas available NWS RAI runway alignment indicator ICAO RAICG radiosonde observation icing at NWS RAIL runway alignment indicator lights GEN RAIM Receiver Autonomous Integrity Monitoring ATC RAIM Receiver autonomous integrity monitoring ICAO RAJAM radar jamming ATC RALT regardless of altitude ATC RAM returned account mechanical GEN RAOB radiosonde observation NWS RAPCON radar approach control GEN RAPI radiosonde report already sent in PIBAL collection GEN Contraction Definition Usage RDAT radar data (digitized) GEN RDC reduce GEN RDG ridge NWS RDH reference datum height (ILS) ICAO RDL radial ICAO RDO radio ICAO RDS radius GEN RDSP redispatch GEN RDSPA redispatch accepted GEN RDWND radar dome wind NWS RE regard GEN REBAT reference BATCS report GEN REC receive or receiver ICAO RECLR recleared ICAO RECON reconnaissance GEN RECON reference conversation GEN REDL runway edge light ICAO REF reference ICAO REFONE reference our telephone conversation GEN REFORM reference form GEN REG registration ICAO REG regulation GEN REGAL range and elevation guidance for approach and landing ATC REIB report established in block ATC REIL runway end identifier lights GEN REINV reference invoice GEN RELBL reliable GEN RELCT relocate GEN RELET reference letter GEN REMES reference message GEN REMT relief electronic maintenance technician GEN RENL runway end light ICAO RENOT regional office notice GEN REOC report when established on course ATC REP report or reporting point ICAO REP represent or representative GEN REP research project GEN REPAML reply by airmail GEN REPBS reference PBS message GEN REPERF reperforator GEN REPMES reply by message GEN REPML reply by mail GEN REPTWX reply by TWX GEN REQ request GEN REQID request if desired GEN REQON request consideration GEN REQRCM request your recommendation GEN REQSTD requested GEN RERTE reroute ICAO RES reserve GEN RES resident GEN RESA Runway end safety area ICAO RESP response GEN RESTR restrict NWS REWRC report when established well to right of course ATC RF radio frequency GEN RF reception fair (radio logs only) ATC RFA request further airways ATC RFI radio frequency interference GEN RFI ready for issue GEN RFL refuel GEN RFS refuse GEN RFTO ready for take­off ATC RG range (lights) ICAO RG reception good (radio logs only) ATC Contraction Definition Usage RGD ragged NWS RGLR regular GEN RGN region GEN RH relative humidity NWS RHC Right­hand circuit ICAO RHI range height indicator GEN RHINO radar echo height information not available NWS RHINO radar range height indicator not operating on scan NWS RIF reclearance in flight ICAO RIF reduction in force GEN RIMAT must ride company material GEN RIOGD Rio Grande NWS RIS reports identification symbol GEN RITC Request in Trail Climb ATC RITD Request in Trail Descent ATC RITE right (direction of turn) ICAO RL report immediately upon leaving ATC RL report leaving ICAO RLA relay to ICAO RLANO relay equipment out of operation GEN RLAOK relay equipment resumed operation GEN RLBG relative bearing GEN RLC report landing completed ATC RLCE request level change en route ICAO RLETFL report leaving each thousand foot level ATC RLLS runway lead­in lighting system ICAO RLNA request level not available ICAO RLS release GEN RLSTN relay station GEN RLTK rhumbline track ATC RLTV relative GEN RLV relieve GEN RLVL report level GEN RM remarks (PIREP only) ATC RMK remark ICAO RMLR radar microwave link repeater GEN RMLT radar microwave link terminal GEN RMN remain GEN RMPCK ramp check ATC RMRK remark GEN RN reception nil (radio logs only) ATC RNAV area navigation ICAO RNFL rainfall NWS RNG Army National Guard GEN RNG radio range ICAO RNLS resume normal speed ATC RNP required navigation performance ICAO RO regional office GEN RO regulated output GEN ROBEPS radar operating below prescribed standard NWS ROBEX regional OPMET bulletin exchange ICAO ROC rate of climb ICAO ROCC NORAD Region Operations Control Center GEN ROD rate of descent ICAO RODA regardless of destination airport ATC ROFOR route forecast ICAO ROLET reference letter from our office GEN ROMEMO reference our memorandum GEN ROMES reference message from our office GEN RON remaining overnight GEN ROPBS reference PBS message from our office GEN RORQN reference requisition from our office GEN Contraction Definition Usage RORU rest of route unchanged ATC ROT rotate GEN ROTEL reference telegram from our office GEN ROTG rotating GEN ROTWX reference our TWX GEN ROV report over ATC RP reception poor (radio logs only) ATC RP right traffic pattern ATC RPA request present altitude ATC RPD rapid NWS RPFOD reported for duty GEN RPI Radar position indicator ICAO RPL repetitive flight plan ICAO RPLC replace GEN RPM rotation per minute GEN RPOC report proceeding on course ATC RPR repair GEN RPRT report GEN RPS radar position symbol ICAO RPSG report passing ATC RPT repeat GEN RPT Repeat or I repeat ICAO RQ Indication of a request ICAO RQ request GEN RQCL request clearance ATC RQDCZ request clearance to depart VFR and leave control zone at ATC RQECZ request clearance to enter control zone VFR at ATC RQMNTS requirements ICAO RQN requisition GEN RQOF request on file ATC RQP request flight plan ICAO RQP request permission GEN RQPP request present position ATC RQR require GEN RQRP request reply GEN RQS request supplementary flight plan ICAO RQTAO request time and altitude over ATC RR low or medium frequency radio range stations GEN RR radar range station GEN RR report immediately upon reaching ATC RR report reaching ICAO RRBN round robin ATC RRCVR remote receiver GEN RRL runway remaining lights GEN RRP runway reference point GEN RRPD runway reference point downwind GEN RRPU runway reference point upwind GEN RRS remainder of same route ATC RRTE reroute ATC RS receiver station GEN RS record special observation (weather reports only) NWS RS right side ATC RSC rescue sub­center ICAO RSCD runway surface condition ICAO RSCU rescue GEN RSG rising NWS RSN reason GEN RSOPN resumed operation GEN RSP responder beacon ICAO RSR en route surveillance radar ICAO RSTR restrict GEN RSU runway supervisory unit GEN RSVN reservation GEN RT right turn after take­off ATC Contraction Definition Usage RT round trip GEN RTB return to base ATC RTD delayed ICAO RTE route GEN RTF radiotelephone GEN RTG radiotelegraph GEN RTHL runway threshold light ICAO RTMTR remote transmitter GEN RTN return ICAO RTND retained GEN RTNE routine GEN RTO report time over ATC RTR remote transmitter/receiver ATC RTR returning to ramp ATC RTRD retard GEN RTRN return GEN RTS return to service ICAO RTT radioteletypewriter GEN RTX report time crossing ATC RTZL runway touchdown zone light ICAO RUF rough NWS RUFORM reference your form GEN RULET reference letter from your office GEN RUMEMO reference your memorandum GEN RUMES reference message from your office GEN RURQN reference requisition from your office GEN RUT standard regional route transmitting frequencies ICAO RUTEL reference telegram from your office GEN RUTWX reference your TWX GEN RV radar vector ATC RV rescue vessel ICAO RVO runway visibility by observer GEN RVR runway visual range ICAO RVRA RVR ten minute average GEN RVRANO RVR ten minute average not available GEN RVRENO RVR ten minute extremes not available GEN RVRM RVR midpoint GEN RVRMNO RVR midpoint not available GEN RVRNO RVR not available GEN RVRR RVR rollout GEN RVRRNO RVR rollout not available GEN RVRT RVR touchdown GEN RVRTNO RVR touchdown not available GEN RVS revise GEN RVSM Reduced Vertical Separation Min­ imum ICAO RVV runway visibility value GEN RVVNO RVV not available GEN RWRC remain well to right of course ATC RWY runway ICAO RY runway GEN S Contraction Definition Usage S South or southern latitude ICAO S/A semi­annual GEN S/RC send/receive center GEN SA duststorm, sandstorm, rising dust or sand METAR SA record observation (weather reports only) NWS Contraction Definition Usage SA sandstorm or dusting ICAO SA surveillance approach GEN SABH simultaneous automatic broadcast homer GEN SADT same direction traffic GEN SAFI semi­automatic flight inspection GEN SAFI semi­automatic flight inspection aircraft GEN SALS short approach lighting system GEN SALS simple approach lighting system ICAO SALSF short approach lighting system with sequenced flashing lights GEN SAN sanitary ICAO SAO surface aviation observation NWS SAP as soon as possible ICAO SAPD speed at pilots discretion GEN SAR search and rescue ICAO SARPS standards and recommended practices ICAO SASK Saskatchewan NWS SAT Saturday ICAO SATCOM satellite communication ICAO SATFY satisfy or satisfactory GEN SATR so as to reach ATC SAVASI simplified abbreviated visual approach slope indicator GEN SAWRS supplementary aviation weather reporting station GEN SAYTA say time able ATC SB southbound ICAO SBAS satellite-based augmentation system ICAO SBFC standby for further clearance ATC SBND southbound ATC SBSD subside NWS SC stratocumulus NWS SCAN self­correcting automatic navigation GEN SCANO automatic scanning unit out of service GEN SCAOK automatic scanning unit returned to service GEN SCAT security control of air traffic GEN SCATANA security control of air traffic and air navigation aids GEN SCC System Command Center GEN SCLN semicolon GEN SCND second (in line) GEN SCS single channel simplex GEN SCSL standing lenticular stratocumulus NWS SCT scattered NWS SCTR sector GEN SCTY security GEN SDB scheduled data base GEN SDBY standby GEN SDF simplified directional facility GEN SE south­east ICAO SE system engineer GEN SEADRM seadrome GEN SEB south­eastbound ICAO SEC second (time) GEN SECMR sector manager GEN SECRA secondary radar GEN SECT sector ICAO SEL space environment laboratory GEN SELCAL selective calling ATC SELS severe local storms NWS SELY southeasterly (weather reports only) NWS SENS sensitivity GEN Contraction Definition Usage SEPN separation GEN SEQ sequence GEN SER service ICAO SERN southeastern (weather reports only) NWS SES supervisory electronics specialist GEN SESC space environment service center GEN SET stack entry time ATC SEV severe ICAO SF standard form GEN SFA single frequency approach GEN SFC surface ICAO SFERICS atmospherics NWS SFL sequence flashing lights GEN SFO sector field office GEN SFO simulated flame out ATC SFPP stored flight plan program ATC SFU sector field unit GEN SG snow grains (weather reports only) METAR SGD signed GEN SGD solar­geophysical data NWS SGFNT significant GEN SGL signal GEN SH showers METAR SHF super high frequency GEN SHFT shift (weather reports only) NWS SHGR hail showers METAR SHGS hail showers (small) METAR SHLW shallow NWS SHORN short range navigation system GEN SHP standard holding procedure GEN SHPL ice pellet showers METAR SHRA rain showers METAR SHRT short GEN SHRTLY shortly NWS SHRTWV shortwave GEN SHSN snow showers METAR SHTDN shutdown GEN SHUD should ATC SHWR shower NWS SI straight­in approach GEN SIA standard instrument approach GEN SIAP standard instrument approach procedure GEN SID standard instrument departure ICAO SIERNEV Sierra Nevada NWS SIF selective identification feature ICAO SIG signature GEN SIGMET significant meteorological information GEN SIGWX significant weather ICAO SIM simulated approach ATC SIMUL simultaneous/ly ICAO SIR snow and ice on runway NWS SIWL single isolated wheel load ICAO SJP standard jet penetration GEN SK sky condition (PIREP only) ATC SKC sky clear METAR SKED schedule ICAO SL sea level GEN SL sick leave GEN SLCT select GEN SLD solid NWS SLGT slight GEN SLMM simultaneous compass locator at middle marker GEN SLO slow GEN SLOM simultaneous compass locator at outer marker GEN Contraction Definition Usage SLP sea level pressure METAR SLP slope GEN SLP speed limiting point ICAO SLR slush on runway NWS SLRAP standard low frequency range approach GEN SLS side lobe suppression GEN SLT sleet NWS SLW slow ICAO SM statute mile GEN SMC squawk mode code GEN SMC surface movement control ICAO SMGCS surface movement guidance and control system GEN SML small GEN SMR statute mile radius GEN SMR surface movement radar ICAO SMRY summary GEN SMS synchronous meteorological satellite GEN SMS systems maintenance sector GEN SMT submit GEN SMTH smooth NWS SMTM sometime GEN SMWHT somewhat GEN SN snow ICAO SN strategic navigation GEN SN systems navigation GEN SNBNK snowbank NWS SND sand or sanded or sanding GEN SNFLK snowflake NWS SNGL single GEN SNOINCR snow depth increase in past hour NWS 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 ICAO SNSH snow showers ICAO SNW snow NWS SNWFL snowfall NWS SOAP spectrometric oil analysis program ATC SOB souls on board ATC SOCC NORAD Sector Operations Control Center GEN SOMSG see our message GEN SOP standard operating procedure GEN SORAP standard omni range approach GEN SP standard holding pattern GEN SP station pressure NWS SPAN stored program for alpha numerics GEN SPB seaplane base GEN SPCLY especially GEN SPD speed GEN SPEC specification GEN SPECI aviation selected special weather report METAR SPKL sprinkle NWS SPL special GEN SPL supplementary flight plan ICAO SPLNS south plains NWS SPO strategic plan of operation ATC SPOT spot wind ICAO SPRD spread NWS SPRL spiral GEN SPS Standard Positioning Service ATC SPT strategic planning team ATC SQ squall METAR SQDN squadron GEN Contraction Definition Usage SQK squawk ATC SQLN squall line NWS SR standard range approach GEN SR sunrise ICAO SRA surveillance radar approach ICAO SRCH search GEN SRE surveillance radar element of preci­ sion approach radar system ICAO SRG short range ICAO SRND surround GEN SRPN special requisition priority number GEN SRR search and rescue region ICAO SRY secondary ICAO SS sandstorm METAR SS sunset ICAO SSALF simplified short approach lighting system with sequenced flashers GEN SSALR simplified short approach lighting system with runway alignment indicator lights GEN SSALS simplified short approach lighting system GEN SSB single sideband ICAO SSE south­south east ICAO SSERN south­southeastern (weather reports only) NWS SSEWD south­southeastward (weather reports only) NWS SSNO request no SIDs or STARs ATC SSR secondary surveillance radar ICAO SST supersonic transport ICAO SSW south­south west ICAO SSWRN south­southwestern (weather reports only) NWS SSWWD south­southwestward (weather reports only) NWS ST saint GEN ST stratus NWS STA straight in approach ICAO STADMR station administrator GEN STAGN stagnation NWS STALO stabilized local oscillator GEN STAR standard terminal arrival GEN STATE military, customs, or police services ICAO STBL stable GEN STBY standby ICAO STCLB start climb ATC STD standard ICAO STDST start descent ATC STDY steady GEN STF stratiform ICAO STFRA stratus fractus NWS STFRM stratiform NWS STG strong NWS STLT satellite GEN STM storm NWS STMGR station manager GEN STMP special traffic management program ATC STN station GEN STNR stationary ICAO STNRY stationary NWS STOL short take­off and landing GEN STR subject terminal control release ATC STRO stereo routes GEN STS status ICAO STWL stopway light ICAO STWY stopway GEN Contraction Definition Usage SUA special use airspace GEN SUB substitute GEN SUBFIX subject to correction GEN SUBJ subject to ICAO SUF sufficient GEN SUG suggest GEN SUN Sunday ICAO SUP supply GEN SUPCHG supercharge GEN SUPPL supplement GEN SUPPS regional supplementary procedures ICAO SUPR superior GEN SUPSD supersede GEN SUPT superintendent GEN SUPVR supervisor GEN SURPIC surface picture ATC SUSP suspend GEN SVC service GEN SVCBL serviceable ICAO SVFR special VFR GEN SVG serving GEN SVN space vehicle number GEN SVR severe GEN SVRL several GEN SW south­west ICAO SWAP severe weather avoidance plan GEN SWB scheduled weather broadcast GEN SWB south­westbound ICAO SWLG swelling NWS SWLY southwesterly (weather reports only) NWS SWRN southwestern (weather reports only) NWS SWSL supplemental weather service location ATC SWY stopway ICAO SX stability index NWS SXN section NWS SYD release subject your discretion GEN SYNOP synoptic NWS SYNS synopsis NWS SYS see your service GEN SYS system GEN Contraction Definition Usage TAPER "temporary appointment pending establishment of a register" GEN TAR terminal area surveillance radar ICAO TARND turn around ATC TARS terminal automated radar services GEN TARS Tethered Aerostat Radar System GEN TAS true air speed GEN TASR terminal area surveillance radar GEN TAWOG travel arrangements without government expense GEN TAX taxi or taxiing ICAO TB turbulence (PIREP only) ATC TBJT turbojet GEN TC time check ATC TC tropical cyclone ICAO TCA terminal control area GEN TCA tactical customer advocate ATC TCAS traffic alert and collision avoidance system GEN TCH threshold crossing height ICAO TCHD threshold crossing height downwind GEN TCHU threshold crossing height upwind GEN TCNTL trans­continental GEN TCOM terminal communications GEN TCP transfer of control point ATC TCU towering cumulus NWS TD Touchdown ATC TD transmitter distributor GEN TDA Today GEN TDEL time delay GEN TDLS Terminal Data Link System GEN TDO Tornado ICAO TDOP Time Dilution of Precision ATC TDWR Terminal Doppler Weather Radar ATC TDY temporary duty GEN TDZ touchdown zone ICAO TDZE touchdown zone elevation ATC TDZL touchdown zone light (system) GEN TEC tower en route control ATC TECA tower en route control area ATC TECR technical reason ICAO TEL telecommunications GEN TEL Telephone ICAO TELAU Teleautograph GEN TELCO telephone company GEN TELCON telephone conference GEN TELEX telephone exchange GEN TELRY telegraph reply GEN TEMP Temperature GEN TEMPO temporary ICAO TEND Trend ICAO TERPS terminal instrument procedures GEN TET Tetrahedron GEN TF terrain following GEN TFC traffic ICAO TFMS traffic flow management system ATC TFR temporary flight restriction GEN TFRCD traffic received ATC TFZ traffic zone GEN TGL touch and go landing ICAO TGS taxiing guidance system ICAO THD Thunderhead NWS THDR Thunder NWS THK Thick NWS THLD Threshold GEN THN Thin NWS THR threshold ICAO THRFTR Thereafter GEN T Contraction Definition Usage T Temperature ICAO T trace (weather reports only) NWS T training GEN T tropical (air mass) NWS T true (bearing) GEN T/R transportation request GEN TA temperature (PIREP only) ATC TA total aboard GEN TA transition altitude ICAO TAC terminal area chart GEN TACAN tactical air navigational aid ICAO TACLO tactical air command liaison officer GEN TACR tactical air navigation GEN TAD ATC tower, approach and departure control facility ATC TAF aerodrome forecast ICAO TAF terminal forecast METAR TAIL tail wind ICAO TAND tandum GEN TANDA time and attendance report GEN TAO TACAN only ATC TAO time and altitude over ATC Contraction Definition Usage THRU through ICAO THRUT Throughout GEN THSD Thousand GEN THTN threaten GEN THU Thursday ICAO TIBA Traffic information broadcast by aircraft ICAO TIL until GEN TINOP transponder inoperative ATC TIP until past ATC TIPS terminal information processing system GEN TKOF take­off ICAO TLM Telemetry ATC TLRNC tolerance GEN TLTP too long to print GEN TLWD tailwind ATC TM time (PIREP only) ATC TM traffic management ATC TMA terminal control area ICAO TMPA traffic management program alert ATC TMPRY temporary GEN TMT transmit GEN TMW tomorrow GEN TNA turn altitude ICAO TNDCY tendency GEN TNGT tonight GEN TNH turn height ICAO TNTV tentative GEN TO travel order GEN TOC to be continued GEN TOC top of climb ICAO TOD time of delivery GEN TODA take­off distance available ICAO TOG take­off gross weight GEN TOP cloud top NWS TOR time of receipt GEN TOR traffic on request ATC TORA take­off run available ICAO TOT time of transmission GEN TOVC top of overcast NWS TP turning point ICAO TP type aircraft (PIREP only) ATC TPA traffic pattern altitude ATC TPG topping NWS TR track ICAO TR VFR low altitude training routes GEN TRA temporary reserved airspace ICAO TRACAB terminal radar approach control in tower cab GEN TRACON terminal radar approach control facility GEN TRAD terminal radar GEN TRAN transient ATC TRANS transmit or transmitter ICAO TRBL trouble GEN TRCV tri­color visual approach slope indicator GEN TRIB tributary NWS TRK track GEN TRLVL transition level ICAO TRML terminal GEN TRMT terminate GEN TRNG Training GEN TRNSP Transport GEN TROF Trough NWS TROP Tropopause NWS TRPCD tropical continental (air mass) NWS Contraction Definition Usage TRPCL Tropical NWS TRPLYR trapping layer NWS TRRN Terrain GEN TRSA terminal radar service area GEN TRSN Transition GEN TRTD Treated GEN TS team supervisor GEN TS Thunderstorm METAR TS transmitter station GEN TSA Transportation Security Administration GEN TSATLC Trans­Atlantic GEN TSEC terminal secondary radar beacon GEN TSFR Transfer GEN TSGR thunderstorm with hail METAR TSGS thunderstorm with small hail METAR TSMNO transmitting capability out of service GEN TSMOK transmitting capability returned to service GEN TSNO thunderstorm information not available METAR TSNT Transient GEN TSO technical standard order GEN TSPAC Trans­Pacific GEN TSPL thunderstorm with ice pellets METAR TSRA thunderstorm with rain METAR TSSA thunderstorm with duststorm or sandstorm METAR TSSN thunderstorm with snow METAR TSTM thunderstorm NWS TT teletypewriter GEN TTS teletype switching facilities GEN TTY teletypewriter station GEN TUE Tuesday ICAO TURB turbulence ICAO TURBC turbulence NWS TURBT turbulent NWS T­VASIS T visual approach slope indicator system ICAO TVL travel GEN TVOR terminal VOR ICAO TWD toward GEN TWEB transcribed weather broadcast GEN TWI twilight GEN TWR aerodrome control tower ICAO TWR tower GEN TWRG towering NWS TWS radar track while scan ATC TWX teletypewriter exchange service GEN TWY taxiway ICAO TWYL taxiway link ICAO TXG taxiing ATC TXT Text ICAO TYP type aircraft ICAO TYPH typhoon ICAO TYPNO teletypewriter communications out of service GEN TYPOK teletypewriter communications returned to service GEN U Contraction Definition Usage U "Intensity unknown (weather reports only)" NWS UA routine PIREP ATC Contraction Definition Usage UA "unable to approve arrival for the time specified" ATC UAB until advised by ATC UAC upper area control center ICAO UAG upper atmosphere geophysics NWS UAR upper air route ICAO UAS unmanned aircraft system ICAO UAT until advised by the tower ATC UCDWN until cleared down ATC UCLT until cleared to land by the tower ATC UD unable to approve departure for the time specified ATC UDDF up and down drafts NWS UDF ultra high frequency direction finding station ICAO UERE User Equivalent Range Error ATC UFA until further advised GEN UFN until further notice GEN UFO unidentified flying object GEN UHA unable higher altitude ATC UHDODT unable higher due opposite direction traffic ATC UHDSDT unable higher due same direction traffic ATC UHDT unable higher due traffic ICAO UHDT unable higher due traffic ICAO UHF ultra high frequency ICAO UIC upper information center ICAO UIR upper flight information region ICAO ULDT unable lower due traffic ATC ULR untra long range ICAO UM unable to maintain ATC UN Unable GEN UNA Unable ICAO UNAP unable to approve ICAO UNAPV unable to approve GEN UNAR unable to approve altitude requested ATC UNATNDD unattended GEN UNAVBL unavailable GEN UNCC unable to contact company radio ATC UNDLD undelivered GEN UNEC unnecessary GEN UNHRD unheard GEN UNID unidentified GEN UNKN unknown GEN UNL unlimited ICAO UNLGTD unlighted GEN UNMON unable to monitor GEN UNMON unmonitored ATC UNOFFL unofficial GEN UNRDBL unreadable GEN UNREL unreliable ICAO UNRELBL unreliable GEN UNRR unable to approve route requested ATC UNRSTD unrestricted GEN UNSATFY unsatisfactory GEN UNSBL unseasonable NWS UNSKED unscheduled GEN UNSTBL unstable NWS UNSTDY unsteady NWS UNSTL unsettle NWS UNTC unable to establish contact ATC UNUSBL unusable GEN UP unknown precipitation METAR UPDFTS up drafts NWS UPDT update NWS UPR upper NWS UPSLP upslope NWS Contraction Definition Usage UPSTRM upstream NWS UQOT unquote GEN URAUZ you are authorized GEN URG urgent GEN URIZR your recommendation is requested GEN USA U.S. Army GEN USAF U.S. Air Force GEN USAFIB U.S. Army Aviation Flight Information GEN USBL usable GEN USCG U.S. Coast Guard GEN USMC U.S. Marine Corps GEN USN U.S. Navy GEN USNO United States Naval Observatory ATC USNOF United States NOTAM Office GEN USNS United States NOTAM System GEN USP urgent special observation (weather reports only) NWS UTA upper control area ICAO UTC Coordinated Universal Time ICAO UTCOK Coordinated Universal Time Coordinate Check Completed GEN UUA urgent PIREP ATC UVV upward vertical velocity NWS UW upwind ATC UWNDS upper winds NWS V Contraction Definition Usage V Variable (weather reports only) NWS VA victor airways ATC VA volcanic ash METAR VAC visual approach chart ICAO VAC Visual approach chart (followed by name/title) ICAO VACAPES Virginia Capes ATC VADA VFR arrival delay advisory ATC VAL in valleys ICAO VAN runway control van ICAO VAPS V/STOL approach system GEN VAR magnetic variation ICAO VAR visual­aural radio range ICAO VARN Variation GEN VASI visual approach slope indicator GEN VASIS visual approach slope indicator system ICAO VC Vicinity METAR/ TAF VC Vicinity METAR VCFG fog in vicinity METAR VCNTY Vicinity GEN VCOT VFR conditions on top ATC VCTR Vector ATC VDF very high frequency direction­ finding station ICAO VDOP Vertical Dilution of Precision ATC VDP visual descent point GEN VER Vertical ICAO VF maintaining visual flight (Special VFR) ATC VFLT visual flight GEN VFPR via flight planned route ATC VFR visual flight rules ICAO VFRSA VFR restrictions still apply ATC Contraction Definition Usage VFY Verify GEN VHF very high frequency ICAO VIA by way of GEN VIP very important person ICAO VIP visual integrated presentation GEN VIS visibility ICAO VLCTY Velocity NWS VLF very low frequency GEN VLFD via low frequency direct ATC VLNT Violent NWS VLR very long range ICAO VLY Valley NWS VM voice modulation GEN VMC visual meteorological conditions ICAO VNAV vertical navigation (from TERPS­A1) GEN VOD via omni direct ATC VOL Volume GEN VOLMET meteorological information for aircraft in flight ICAO VOPR voice operated relay GEN VOR VHF omni­directional radio range ICAO VOR/DME VOR and DME (collocated) GEN VORTAC VOR and TACAN (collocated) ICAO VOT VOR airborne equipment test facility ICAO VOT VOR test signal GEN VOT vorticity GEN VOU voucher GEN VR veer NWS VR VFR military training routes GEN VRB variable ICAO VRBL variable GEN VRG visual reference gate GEN VRISL Vancouver Island, BC NWS VRT MOTN vertical motion NWS VSA by visual reference to the ground ICAO VSB visible GEN VSBY visibility NWS VSBYDR visibility decreasing rapidly NWS VSBYIR visibility increasing rapidly NWS VSL vessel GEN VSP vertical speed ICAO VSPI visual glide path indicator GEN VSTOL vertical/short take­off and landing GEN VTOL vertical take­off and landing ICAO VV vertical visibility (indefinite ceiling) METAR Contraction Definition Usage WBRH "Weather Bureau Regional Headquar- ters" GEN WBTS Whereabouts GEN WCLC Watch check list completed GEN WDC­1 World Data Centers in Western Europe NWS WDC­2 World Data Centers throughout rest of world NWS WDI wind direction indicator ICAO WDLY Widely NWS WDSPR Widespread GEN WDSPRD Widespread NWS WEA Weather NWS WED Wednesday ICAO WEF With effect from, or effective from ICAO WFO Weather Forecast Office GEN WFP Warm front passage NWS WG Working group GEN WGS World Geodetic System ATC WGS­84 World geodetic system 1984 ICAO WI within ICAO WIBIS will be issued GEN WICA while in control area ATC WICZ while in control zone ATC WID width ICAO WIE with immediate effect or effective immediately ICAO WILCO will comply GEN WINT winter NWS WINTEM forecast upper wind and temperature for aviation ICAO WIP work in progress ICAO WK weak GEN WKDAY weekday GEN WKEND weekend GEN WKN weaken GEN WL will GEN WLAV will advise GEN WMO World Meteorological Organization GEN WMSC Weather Message Switching Center GEN WND wind NWS WNW west­north west ICAO WNWRN west­northwestern (weather reports only) NWS WNWWD west­northwestward (weather reports only) NWS WO Washington Office GEN WO without GEN WP waypoint GEN WPLTO western plateau NWS WPM words per minute GEN WPRT waypoint report ATC WPT waypoint ICAO WR wet runway NWS WRC well to right of course ATC WRM warm NWS WRMFNT warm front NWS WRNG warning NWS WRS worse GEN WS SIGMET NWS WS weak signals ATC WS wind shear ICAO WSCMO Weather Service Contract Meteoro­ logical Observatory GEN WSHFT wind shift NWS WSO Weather Service Office GEN WSOM weather service operations manual NWS W Contraction Definition Usage W warm (air mass) NWS W west or western longitude ICAO W White ICAO WA AIRMET NWS WAAS Wide Area Augmentation System ICAO WAC world aeronautical chart GEN WAC World aeronautical chart ­ ICAO 1:1 000 000(followed by name/title) ICAO WAFC world area forecast center ICAO WAIOP will accept, if offered, the position GEN WB Westbound ICAO WBAR wing bar lights ICAO WBND Westbound ATC WBRBN will be reported by NOTAM GEN Contraction Definition Usage WSP "weather system processor (replacement for LLWAS)" GEN WSR wet snow on runway NWS WSSF National Weather Service Support Facility GEN WSSU National Weather Service Support Unit GEN WSTCH wasatch range NWS WSW west­south west ICAO WSWRN west­southwestern (weather reports only) NWS WSWWD west­southwestward (weather reports only) NWS WT Weight GEN WTR Water NWS WTR well to right ATC WTSPT waterspout NWS WU Western Union Telegraph Company GEN WV Wave NWS WV wind at altitude (PIREP only) ATC WW severe weather forecast NWS WWW World wide web ICAO WX weather ICAO WX weather at altitude (PIREP only) ATC WXCON weather reconnaissance flight pilot report NWS WYAIO will you accept, if offered, the position of GEN Contraction Definition Usage XW crosswind ATC XX heavy (to qualify weather phenom­ ena, e.g. XXRA ­ heavy rain) ICAO Y Contraction Definition Usage Y "Yukon Standard Time (time groups only)" NWS YCZ yellow caution zone (runway lighting) ICAO YD Yards ICAO YDA Yesterday GEN YES Yes (affirmative) ICAO YKN Yukon NWS YL approach light lane ATC YLSTN Yellowstone NWS YMSG your message GEN YMSGD your message date GEN YR Your ICAO X Z Contraction Definition Usage X Cross ICAO X Obscured sky condition NWS XBAR Crossbar ICAO XCP Except NWS XFSS Auxiliary Flight Service Station ATC XH special handling service for aircraft GEN XNG Crossing ICAO XPC expect NWS XPLOS explosive GEN XREP auxiliary report GEN XS atmospherics ICAO XTAL crystal GEN XTLK cross talk ATC Contraction Definition Usage Z Greenwich Mean Time GEN Z jet terminal area ATC ZI zonal index NWS ZI zone of interior NWS ZM Z marker (VHF station location marker) GEN ZRNO freezing rain information not avail­ able (weather reports only) NWS