UNITED STATES OF AMERICA- AERONAUTICAL CONTRACTIONS

 

 

Section 1. Decode

> EXPLANATION OF CODES

GEN - Indicates general aeronautical usage.

NWS - Indicates National Weather Service and aeronautical weather usage.

ATC - Indicates Air Traffic Control usage.

ICAO - Indicates ICAO 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 ATC
A/H already had ATC
AAC Aeronautical Center, FAA GEN
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 GEN
ABN aerodrome beacon ICAO
ABND abandon GEN
ABNDT abundant GEN
ABNML abnormal GEN
ABT about GEN
ABV above GEN
AC Advisory Circular GEN
AC altocumulus NWS
AC assistant chief GEN
ACA artic control area ATC
ACARS Aircraft communication addressing & reporting system ICAO
ACAS airborne collision avoidance system ICAO
ACC area control center ATC
ACCAS 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 GEN
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 GEN
ADL aggregate demand list ATC
ADLO Air Defense Liaision 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 advisory route ATC
ADR airport departure rate 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
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
ADW air defense warning GEN
ADVZY advisory ATC
ADZ advise GEN
ADZAR advise arrival ATC
ADZI advise intentions ATC
ADZOF advise this office GEN
ADZY advisory GEN
ADZY advisory ATC
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
AFREP Air Force Representative to the FAA GEN
AFRT air freight GEN
AFS aeronautical fixed service GEN
AFS airways facilities sector GEN
AFSFO airways facilities sector field office GEN
AFSFOU airways facilities sector field office plus unit GEN
AFSO airways facilities sector office 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 GEN
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 Aeronautical 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 region GEN
ALAFFO all airway facilities sector and field offices GEN
ALANO all accident notice offices GEN
ALARTC all air route traffic control centers in region GEN
ALAT all air traffic service personnel in region GEN
ALATAS all air traffic (area) supervisors in region GEN
ALATF all air traffic field facilities GEN
ALATFO all air traffic field offices GEN
ALCKT all offices having send-receive teletypewriter service on circuit GEN
ALCS/C all AT combined station/centers in region GEN
ALCS/T all AT combined station/towers in region 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 Service B GEN
ALFSFO all flight standards field offices GEN
ALFSS all flight service stations in region GEN
ALG along GEN
ALGHNY Allegheny NWS
ALIATSC all international aeronautical telecommunication switching centers GEN
ALIFO all international field offices GEN
ALIFSS all international flight service stations in region 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 region GEN
ALRGN all regional offices GEN
ALS approach light system GEN
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 GEN
ALTA Alberta NWS
ALTM altimeter GEN
ALTN alternate GEN
ALTN alternate (aerodrome) ICAO
ALTPT alternate airport GEN
ALTRV altitude reservation GEN
ALTWR all ATC towers in region GEN
ALUTN Aleutian NWS
ALWF actual wind factor NWS
AM ante meridiem NWS
AMA area minimum altitude ICAO
AMB ambiguity GEN
AMC Air Mobiity Command ATC
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
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 recipitation 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 GEN
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
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 GEN
ARS Air Rescue Service (USAF) GEN
ARS special air-report GEN
ARSA airport radar service area ATC
ARSR air route surveillance radar GEN
ARST arrest GEN
ARSUP area supervisor GEN
ARTC air route traffic control GEN
ARTCC Air Route Traffic Control Center GEN
ARTS Automated Radar Terminal Sytems 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
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 GEN
ASR airport surveillance radar GEN
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 GEN
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 ATC Systems Command Center GEN
ATCT Airport Traffic Control Tower GEN
ATD actual time of departure ATC
ATD air traffic division GEN
ATDO airways technical district office GEN
ATFC account traffic GEN
ATFM air traffic flow management ICAO
ATIS automatic terminal information service GEN
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
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
ATS air traffic service GEN
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 ICAO
AUTO automatic GEN
AUTOB automatic weather reporting system GEN
AUW all up weight (gross weight) GEN
AUX auxiliary GEN
AUZ authorize GEN
AVANA altitude reservation void for aircraft not airborne by --- ATC
AVBL available GEN
AVFP activate VFR flight plan ATC
AVFPNO pilot failed to activate VFR/DVFR flight plan ATC
AVG average GEN
AVGAS aviation gasoline GEN
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 GEN
AXPS air express GEN
AZM azimuth GEN
AZRAN azimuth and range data ATC

 

 

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 GEN
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 GEN
BCREQ broadcast requested ATC
BCST broadcast GEN
BCSTN broadcast station GEN
BDA Bermuda NWS
BDAT beacon data (digitized) ATC
BDR border GEN
BDRY boundary ATC
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 bombimg 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 straight-in approach ATC
BSRAP beginning standard range approach ATC
BSRO begin standard refuel orbit ATC
BT back taxiing ATC
BTL between layers ICAO
BTN between GEN
BTR better GEN
BTWN between NWS
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

 

 

 

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
CAB Civil Aeronautics Board GEN
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 GEN
CAT clear air turbulence GEN
CATX climb and cross ATC
CAUFN caution advised until further notice GEN
CAVOK cloud and visiblity 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
CCC Regional Communications Control Center GEN
CCD City (or County) Civil Defense Director 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
CDN coordination ICAO
CDM collaborative decision making ATC
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
CFCF central flow control function GEN
CFM confirm GEN
CFM Confirm or I confirm ICAO
CFN confine GEN
CFP cold front passage NWS
CFPL carryover from previous log ATC
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 channel-continuity-check of transmission to permit comparison of your record of channel-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
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 American Aerospace Defense Command GEN
CIRNAV circumnavigate ATC
CIRNOT circuit notice GEN
CIRVIS communications instructions for reporting 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 GEN
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 GEN
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
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 GEN
COMB combine GEN
COML commercial GEN
COMLO compass locator GEN
COMPR compare GEN
COMPRT compartment GEN
CONC concrete GEN
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 continues ICAO
CONSO CONSOLAN Facility GEN
CONSOL consol beacon GEN
CONSOLAN low or medium frequency long range navigational aid GEN
CONST construction GEN
CONT continue or continuously GEN
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 Controller-pilot 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
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 GEN
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 GEN
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 central 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

 

 

 

D

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

D-ATIS

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 conroller-pilot 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

GEN

DELPHO

deliver by telephone

GEN

DEMOL

demolition

GEN

DENEB

fog dispersal operations

ICAO

DEP

depart

ATC

DEP

departure

GEN

DEPT

department

GEN

DES

descend to or descending to

ICAO

DESTN

destination

GEN

DETRESFA

Distress Phase Code (Alerting Service)

ATC

DEV

deviation

ATC

DEW

distant early warning

GEN

DEWIZ

distant early warning identification zone

GEN

DF

direction finder

GEN

DFCLT

difficult

GEN

DFDR

Digital flight data recorder

ICAO

DFL

daily flight log

GEN

DFNT

definite

GEN

DFRS

differs

GEN

DFSTN

direction finding station

GEN

DFTI

distance from touchdown indicator

GEN

DFUS

diffuse

GEN

DGCGO

dangerous cargo

GEN

DGNL

diagonal

GEN

DGR

danger

GEN

DH

decision height

GEN

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

GEN

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

GEN

DMEG

DME-collocated with glide slope

GEN

DMEL

DME-collocated with localizer

GEN

DMER

DME-tactical air navigation with DME only commissioned

GEN

DMEV

DME-collocated 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

DOD

Department of Defense

GEN

DOE

Department of Energy

GEN

DOLLY

data link

GEN

DOM

domestic

ICAO

DOT

Department of Transportation

GEN

DOT-1

Transport One-Secretary of Transportation

ATC

DOT-2

Transport Two-Deputy 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