NOTAM Abbreviations - Proairpilot.com

R
R Acknowledgment of receipt (message handling)
R Received (acknowledgment of receipt)
R Restricted area (followed by identification)
R Right (runway identification)
R Runway (used in RVR measurement)
R/O Receive Only
R/OC Receive Only Centers
RA Rain
RAA Remote Airport Advisory
RAAF Royal Australian Air Force
RABA No RAWIN observation no balloons available
RABAL Radiosonde balloon wind data
RABAR Radiosonde balloon release
RAC Request Altitude Change
RAC Rules of the Air and Air Traffic Services
RACE Request Altitude Changes En Route
RACFI Radio and Communication Facilities Inoperative
RACO No RAWIN Observation Communications Out
RACON Radar Responder Beacon
RADAT Radiosonde Observation Data
RADEP Radar Departure
RADNO Report missing account radio failure
RADON Radar Beacon
RADU Weather Radar Analysis and Development Unit
RAF Royal Air Force
RAFC Regional Area Forecast Center
RAFI Radiosonde Observation Not Filed
RAFRZ Radiosonde Observation Freezing Levels
RAG Ragged
RAG Runway Arresting Gear
RAGF Remote Air Ground Facility
RAHE No RAWIN observation no gas available
RAI Runway Alignment Indicator
RAICG Radiosonde Observation Icing At
RAIL Runway Alignment Indicator Lights
RAIM Receiver Autonomous Integrity Monitoring
RAJAM Radar Jamming
RALT Regardless of Altitude
RAM Returned Account Mechanical
RAOB Radiosonde Observation
RAPCON Radar Approach Control
RAPI Radiosonde report already sent in
RARAD Radar Advisory
RAREP Radar Weather Report
RASC Regional AIS System Centre
RASH Rain Showers
RASN Rain and snow or showers of rain and snow
RAVU Radiosonde Analysis and Verification Unit
RAWE No RAWIN observations unfavorable weather
RAWI No RAWIN observations high and gusty winds
RAWIN Upper winds observation (by radio methods)
RAWX Returned Account Weather
RB Rescue Boat
RB Right Base
RBDE Radar Bright Display Equipment
RBN Radio Beacon
RBOC Report Back on Course
RBOF Report Back on Frequency
RBS PP (RBS) Ration by schedule plus compression
RBS Radar Bomb Scoring
RC Reverse Course
RC Road Reconnaissance
RCA Reach Cruising Altitude
RCADV Reverse Course and Advise
RCAG Remote Communications Air Ground Facility
RCALT Reach Cruising Altitude
RCC Rescue Coordination Center
RCD Radar Cloud Detection Report
RCDNA Radar Cloud Detection Report Not Available
RCDNE Radar Cloud Detection Report No Echoes Observed
RCDNO Radar cloud detector inoperative due to breakdown until
RCDOM Radar cloud detector inoperative due to maintenance until
RCF Radio Communication Failure
RCF Remain on Company Frequency
RCH Reach
RCK Radio Check
RCKY Rockies (mountains)
RCL Runway Center Line
RCLL Runway Center Line Lights
RCLM Runway Centerline Marking
RCLR Radio Communications Link Repeater
RCLS Runway Centerline Light System
RCLT Radio Communications Link Terminal
RCMD Recommend
RCN Royal Canadian Navy
RCO Remote Communication Outlet
RCOM En Route Communications
RCON Reconfiguration
RCPT Receipt
RCR Runway Condition Reading
RCRD Record
RCS Rehost Computer System
RCV Receive
RCVNO Receiving Capability Out
RDARA Regional and Domestic Air Route Area
RDAT Radar Data
RDC Reduce
RDG Ridge
RDH Reference Datum Height (ILS)
RDL Radial
RDO Radio
RDS Radius
RDSP Redispatch
RDSPA Redispatch Accepted
RDWND Radar Dome Wind
RE Regard
REC Receive or receiver
RECLR Recleared
RECON Reconnaissance
RECON Reference Conversation
REDL Runway Edge Light
REF Reference
REFONE Reference our telephone conversation
REFORM Reference Form
REG Registration
REG Regulation
REGAL Range and Elevation Guidance for Approach and Landing
REIB Report Established in Block
REIL Runway End Identifier Lights
REINV Reference Invoice
RELBL Reliable
RELCT Relocate
RELET Reference Letter
REMES Reference Message
REMT Relief Electronic Maintenance Technician
RENL Runway End Light
RENOT Regional Office Notice
REOC Report When Established On Course
REP Report or reporting point
REP Represent or representative
REP Research Project
REPAML Reply By Airmail
REPBS Reference PBS message
REPERF Reperforator
REPMES Reply By Message
REPML Reply By Mail
REPTWX Reply By TWX
REQ Request
REQID Request If Desired
REQON Request Consideration
REQRCM Request Your Recommendation
REQSTD Requested
RERTE Reroute
RES Reserve
RES Resident
RESA Runway End Safety Area
RESP Response
RESTR Restrict
REWRC Report When Established Well to Right of Course
RF Radar Facility
RF Radio Frequency
RF Reception Fair
RFA Request Further Airways
RFI Radio Frequency Interference
RFI Ready For Issue
RFL Refuel
RFS Refuse
RFTO Ready For Takeoff
RG Range (lights)
RG Reception good
RGD Ragged
RGLR Regular
RGN Region
RH Relative Humidity
RHC Right Hand Circuit
RHI Range Height Indicator
RHINO Radar Echo Height Information Not Available
RHINO Radar Range Height Indicator Not Operating on Scan
RIF Reclearance In Flight
RIF Reduction In Force
RIMAT Must Ride Company Material
RIOGD Rio Grande
RIS Reports Identification Symbol
RITC Request in Trail Climb
RITD Request in Trail Descent
RITE Right (direction of turn)
RL Report immediately upon leaving
RL Report Leaving
RLA Relay To
RLANO Relay equipment out of operation
RLAOK Relay equipment resumed operation
RLBG Relative Bearing
RLC Report Landing Completed
RLCE Request Level Change En Route
RLETFL Report Leaving Each Thousand Foot Level
RLLS Runway Leading Lighting System
RLNA Request Level Not Available
RLS Release
RLSTN Relay Station
RLTK Rhumbline Track
RLTV Relative
RLV Relieve
RLVL Report Level
RM Remarks
RMK Remark
RMLR Radar Microwave Link Repeater
RMLT Radar Microwave Link Terminal
RMN Remain
RMPCK Ramp Check
RMRK Remark
RN Reception Nil
RNAV Area Navigation
RNFL Rainfall
RNG Army National Guard
RNG Radio Range
RNLS Resume Normal Speed
RNP Required Navigation Performance
RO Regional Office
RO Regulated Output
ROBEPS Radar Operating Below Prescribed Standard
ROBEX Regional OPMET Bulletin Exchange
ROC Rate of Climb
ROCC NORAD Region Operations Control Center
ROD Rate of Descent
RODA Regardless of Destination Airport
ROFOR Route Forecast
ROLET Reference Letter from our office
ROMEMO Reference Our Memorandum
ROMES Reference Message from our office
RON Remaining Overnight
ROPBS Reference PBS message from our office
RORQN Reference requisition from our office
RORU Rest Of Route Unchanged
ROT Rotate
ROTEL Reference telegram from our office
ROTG Rotating
ROTWX Reference our TWX
ROV Report Over
RP Reception Poor (radio logs only)
RP Right Traffic Pattern
RPA Request Present Altitude
RPD Rapid
RPFOD Reported For Duty
RPI Radar Position Indicator
RPL Repetitive Flight Plan
RPLC Replace
RPM Rotation Per Minute
RPOC Report Proceeding On Course
RPR Repair
RPRT Report
RPS Radar Position Symbol
RPSG Report Passing
RPT Repeat
RPT Repeat or I repeat
RQ Indication of a request
RQ Request
RQCL Request Clearance
RQDCZ Request Clearance to Depart VFR and Leave Control Zone at
RQECZ Request Clearance to Enter Control Zone VFR at
RQMNTS Requirements
RQN Requisition
RQOF Request on File
RQP Request Flight Plan
RQP Request Permission
RQPP Request Present Position
RQR Require
RQRP Request Reply
RQS Request Supplementary Flight Plan
RQTAO Request Time and Altitude Over
RR Low or medium frequency radio range stations
RR Radar Range Station
RR Report immediately upon reaching
RR Report Reaching
RRBN Round Robin
RRCVR Remote Receiver
RRL Runway Remaining Lights
RRP Runway Reference Point
RRPD Runway Reference Point Downwind
RRPU Runway Reference Point Upwind
RRS Remainder of Same Route
RRTE Reroute
RS Receiver Station
RS Record Special Observation (weather reports only)
RS Right Side
RSC Rescue Subcenter
RSCD Runway Surface Condition
RSCU Rescue
RSG Rising
RSN Reason
RSOPN Resumed Operation
RSP Responder Beacon
RSR En Route Surveillance Radar
RSTR Restrict
RSU Runway Supervisory Unit
RSVN Reservation
RT Right turn after takeoff
RT Round Trip
RTB Return To Base
RTD Delayed
RTE Route
RTF Radiotelephone
RTG Radiotelegraph
RTHL Runway Threshold Light
RTMTR Remote Transmitter
RTN Return
RTND Retained
RTNE Routine
RTO Report Time Over
RTR Remote Transmitter/Receiver
RTR Returning To Ramp
RTRD Retard
RTRN Return
RTS Return To Service
RTT Radio Teletypewriter
RTX Report time crossing
RTZL Runway Touchdown Zone Light
RUF Rough
RUFORM Reference your form
RULET Reference letter from your office
RUMEMO Reference your memorandum
RUMES Reference message from your office
RURQN Reference requisition from your office
RUT Standard regional route transmitting frequencies
RUTEL Reference telegram from your office
RUTWX Reference your TWX
RV Radar Vector
RV Rescue Vessel
RVO Runway Visibility by Observer
RVR Runway Visual Range
RVRA Runway Visual Range (RVR) ten minute average
RVRANO Runway Visual Range (RVR) ten minute average not available
RVRENO Runway Visual Range (RVR) ten minute extremes not available
RVRM Runway Visual Range (RVR) midpoint
RVRMNO Runway Visual Range (RVR) midpoint not available
RVRNO Runway Visual Range (RVR) not available
RVRR Runway Visual Range (RVR) rollout
RVRRNO Runway Visual Range (RVR) rollout not available
RVRT Runway Visual Range (RVR) touchdown
RVRTNO Runway Visual Range (RVR) touchdown not available
RVS Revise
RVV Runway Visibility Value
RVSM Reduced Vertical Separation Minimums
RVVNO RVV not available
RWRC Remain Well to Right of Course
RWY Runway
RY Runway

S
S South or southern latitude
S/A Semiannual
S/RC Send/Receive Center
SA Duststorm, sandstorm, rising dust or sand
SA Record Observation (weather reports only)
SA Sandstorm or dusting
SA Surveillance Approach
SABH Simultaneous Automatic Broadcast Homer
SADT Same Direction Traffic
SAFI Semiautomatic Flight Inspection
SAFI Semiautomatic Flight Inspection Aircraft
SALS Short Approach Lighting System
SALS Simple Approach Lighting System
SALSF Short Approach Lighting System with Sequenced Flashing Lights
SAN Sanitary
SAO Surface Aviation Observation
SAP Soon As Possible
SAPD Speed at Pilots Discretion
SAR Search and Rescue
SARPS Standards and Recommended Practices
SASK Saskhewan
SATFY Satisfy or satisfactory
SATR So As To Reach
SAVASI Simplified Abbreviated Visual Approach Slope Indicator
SAWRS Supplementary Aviation Weather Reporting Station
SAYTA Say Time Able
SB Southbound
SBAS Satellite-Based Augmentation System
SBFC Standby For Further Clearance
SBND Southbound
SBSD Subside
SC Stratocumulus
SCAN Self Correcting Automatic Navigation
SCANO Automatic Scanning Unit Out of Service
SCAOK Automatic Scanning Unit Returned to Service
SCAT Security Control of Air Traffic
SCATANA Security Control of Air Traffic and Air Navigation Aids
SCC System Command Center
SCLN Semicolon
SCND Second (in line)
SCS Single Channel Simplex
SCSL Standing Lenticular Stratocumulus
SCT Scattered
SCTR Sector
SCTY Security
SDB Scheduled Data Base
SDBY Standby
SDF Simplified Directional Facility
SE Southeast
SE System Engineer
SEADRM Seadrome
SEB South Eastbound
SEC Second (time)
SECMR Sector Manager
SECRA Secondary Radar
SECT Sector
SEL Space Environment Laboratory
SELCAL Selective Calling
SELS Severe Local Storms
SELY South Easterly (weather reports only)
SENS Sensitivity
SEPN Separation
SEQ Sequence
SER Service
SERN South Eastern
SES Supervisory Electronics Specialist
SESC Space Environment Service Center
SET Stack Entry Time
SEV Severe
SF Standard Form
SFA Single Frequency Approach
SFC Surface
SFERICS Atmospherics
SFL Sequence Flashing Lights
SFO Sector Field Office
SFO Simulated Flame Out
SFPP Stored Flight Plan Program
SFU Sector Field Unit
SG Snow Grains (weather reports only)
SGD Signed
SGD Solar Geophysical Data
SGFNT Significant
SGL Signal
SH Showers
SHF Super High Frequency
SHFT Shift
SHGR Hail Showers
SHGS Hail Showers (small)
SHLW Shallow
SHORN Short Range Navigation System
SHP Standard Holding Procedure
SHPL Ice Pellet Showers
SHRA Rain Showers
SHRT Short
SHRTLY Shortly
SHRTWV Shortwave
SHSN Snow Showers
SHTDN Shutdown
SHUD Should
SHWR Shower
SI Straight In Approach
SIA Standard Instrument Approach
SIAP Standard Instrument Approach Procedure
SID Standard Instrument Departure
SIERNEV Sierra Nevada
SIF Selective Identification Feature
SIG Signature
SIGMET Significant Meteorological Information
SIGWX Significant Weather
SIM Simulated Approach
SIMUL Simultaneous
SIR Snow and Ice on Runway
SIWL Single Isolated Wheel Load
SJP Standard Jet Penetration
SK Sky condition
SKC Sky clear
SKED Schedule
SL Sea Level
SL Sick Leave
SLCT Select
SLD Solid
SLGT Slight
SLMM Simultaneous Compass Locator at Middle Marker
SLO Slow
SLOM Simultaneous Compass Locator at Outer Marker
SLP Sea Level Pressure
SLP Slope
SLP Speed Limiting Point
SLR Slush on Runway
SLRAP Standard Low Frequency Range Approach
SLS Side Lobe Suppression
SLT Sleet
SLW Slow
SM Statute Mile
SMC Squawk Mode Code
SMC Surface Movement Control
SML Small
SMR Statute Mile Radius
SMR Surface Movement Radar
SMRY Summary
SMS Synchronous Meteorological Satellite
SMS Systems Maintenance Sector
SMT Submit
SMTH Smooth
SMTM Sometime
SMWHT Somewhat
SN Snow
SN Strategic Navigation
SN Systems Navigation
SNBNK Snowbank
SND Sand or sanded or sanding
SNFLK Snowflake
SNGL Single
SNOINCR Snow depth increase in past hour
SNOWTAM NOTAM reporting the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush or ice on the movement area
SNSH Snow Showers
SNW Snow
SNWFL Snowfall
SOAP Spectrometric Oil Analysis Program
SOB Souls On Board
SOCC NORAD Sector Operations Control Center
SOM Satellite Communication
SOMSG See Our Message
SOP Standard Operating Procedure
SORAP Standard Omni Range Approach
SP Standard Holding Pattern
SP Station Pressure
SPAN Stored Program for Alpha Numerics
SPB Seaplane Base
SPCLY Especially
SPD Speed
SPEC Specification
SPECI Aviation selected special weather report
SPKL Sprinkle
SPL Special
SPL Supplementary Flight Plan
SPLNS South Plains
SPO Strategic Plan of Operation
SPOT Spot Wind
SPRD Spread
SPRL Spiral
SPS Standard Positioning Service
SPT Strategic Planning Team
SQ Squall
SQDN Squadron
SQK Squawk
SQLN Squall Line
SR Standard Range Approach
SR Sunrise
SRA Surveillance Radar Approach
SRCH Search
SRE Surveillance Radar Element of precision approach radar system
SRG Short Range
SRND Surround
SRPN Special Requisition Priority Number
SRR Search and Rescue Region
SRY Secondary
SS Sandstorm
SS Sunset
SSALF Simplified Short Approach Lighting System with Sequenced Flashers
SSALR Simplified Short Approach Lighting System with Runway Alignment Indicator Lights
SSALS Simplified Short Approach Lighting System
SSB Single Side Band
SSE South South East
SSERN South South Eastern
SSEWD South South Eastward
SSNO Request no SIDs or STARs
SSR Secondary Surveillance Radar
SST Supersonic Transport
SSW South South West
SSWRN South South Western
SSWWD South South Westward
ST Saint
ST Stratus
STA Straight In Approach
STADMR Station Administrator
STAGN Stagnation
STALO Stabilized Local Oscillator
STAR Standard Terminal Arrival
STATE Military, customs, or police services
STBL Stable
STCLB Start Climb
STD Standard
STDST Start Descent
STDY Steady
STF Stratiform
STFRA Stratus Fractus
STFRM Stratiform
STG Strong
STLT Satellite
STM Storm
STMGR Station Manager
STMP Special Traffic Management Program
STN Station
STNR Stationary
STNRY Stationary
STOL Short Takeoff and Landing
STR Subject Terminal Control Release
STRO Stereo Routes
STS Status
STWL Stopway Light
STWY Stopway
SUA Special Use Airspace
SUB Substitute
SUBFIX Subject to Correction
SUBJ Subject to
SUF Sufficient
SUG Suggest
SUP Supply
SUPCHG Supercharge
SUPPL Supplement
SUPPS Regional Supplementary Procedures
SUPR Superior
SUPSD Supersede
SUPT Superintendent
SUPVR Supervisor
SURPIC Surface Picture
SUSP Suspend
SVC Service
SVCBL Serviceable
SVFR Special VFR
SVG Serving
SVN Space Vehicle Number
SVR Severe
SVRL Several
SW South West
SWAP Severe Weather Avoidance Plan
SWB Scheduled Weather Broadcast
SWB South Westbound
SWLG Swelling
SWLY South Westerly
SWRN South Western
SWSL Supplemental Weather Wervice Location
SWY Stopway
SX Stability Index
SXN Section
SYD Release Subject Your Discretion
SYNOP Synoptic
SYNS Synopsis
SYS See Your Service
SYS System

T
T Temperature
T Trace (weather reports only)
T Training
T Tropical (air mass)
T True (bearing)
T/R Transportation Request
TA Temperature (PIREP only)
TA Total Aboard
TA Transition Altitude
TAC Terminal Area Chart
TACAN Tactical Air Navigational Aid
TACLO Tactical Air Command Liaison Officer
TACR Tactical Air Navigation
TAD Tower Approach and Departure Control Facility
TAF Terminal Aerodrome Forecast
TAIL Tail Wind
TAND Tandem
TANDA Time and Attendance Report
TAO TACAN only
TAO Time and Altitude Over
TAPER Temporary Appointment Pending Establishment of a Register
TAR Terminal Area Surveillance Radar
TARND Turn Around
TARS Terminal Automated Radar Services
TARS Tethered Aerostat Radar System
TAS True Air Speed
TASR Terminal Area Surveillance Radar
TAWOG Travel Arrangements Without Government Expense
TB Turbulence (PIREP only)
TBJT Turbojet
TC Time Check
TC Tropical Cyclone
TCA Tactical Customer Advocate
TCA Terminal Control Area
TCAS Traffic Alert and Collision Avoidance System
TCH Threshold Crossing Height
TCHD Threshold Crossing Height Downwind
TCHU Threshold Crossing Height Upwind
TCNTL Transcontinental
TCOM Terminal Communications
TCP Transfer of Control Point
TCU Towering Cumulus
TD Touchdown
TD Transmitter Distributor
TDA Today
TDEL Time Delay
TDLS Terminal Data Link System
TDO Tornado
TDOP Time Dilution of Precision
TDWR Terminal Doppler Weather Radar
TDY Temporary Duty
TDZ Touchdown Zone
TDZE Touchdown Zone Elevation
TDZL Touchdown Zone Light (system)
TEC Tower En Route Control
TECA Tower En Route Control Area
TECR Technical Reason
TEL Telecommunications
TEL Telephone
TELAU Teleautograph
TELCO Telephone Company
TELCON Telephone Conference
TELEX Telephone Exchange
TELRY Telegraph Reply
TEMP Temperature
TEMPO Temporary
TEND Trend
TERPS Terminal Instrument Procedures
TET Tetrahedron
TF Terrain Following
TFC Traffic
TFMS Traffic Flow Management System
TFR Temporary Flight Restriction
TFRCD Traffic Received
TFZ Traffic Zone
TGL Touch and Go Landing
TGS Taxiing Guidance System
THD Thunderhead
THDR Thunder
THK Thick
THLD Threshold
THN Thin
THR Threshold
THRFTR Thereafter
THRU Through
THRUT Throughout
THSD Thousand
THTN Threaten
TIBA Traffic Information Broadcast by Aircraft
TIL Until
TINOP Transponder Inoperative
TIP Until Past
TIPS Terminal Information Processing System
TKOF Takeoff
TLM Telemetry
TLRNC Tolerance
TLTP Too Long To Print
TLWD Tailwind
TM Time (PIREP only)
TM Traffic Management
TMA Terminal Control Area
TMPA Traffic Management Program Alert
TMPRY Temporary
TMT Transmit
TMW Tomorrow
TNA Turn Altitude
TNDCY Tendency
TNGT Tonight
TNH Turn Height
TNTV Tentative
TO Travel Order
TOC To Be Continued
TOC Top of Climb
TOD Time of Delivery
TODA Takeoff Distance Available
TOG Takeoff Gross Weight
TOP Cloud top
TOR Time of Receipt
TOR Traffic on Request
TORA Takeoff Run Available
TOT Time of Transmission
TOVC Top of Overcast
TP Turning Point
TP Type Aircraft (PIREP only)
TPA Traffic Pattern Altitude
TPG Topping
TR Track
TR VFR low altitude training routes
TRA Temporary Reserved Airspace
TRACAB Terminal Radar Approach Control in Tower Cab
TRACON Terminal Radar Approach Control Facility
TRAD Terminal Radar
TRAN Transient
TRANS Transmit or transmitter
TRBL Trouble
TRCV Tricolor Visual Approach Slope Indicator
TRG Training
TRIB Tributary
TRK Track
TRLVL Transition Level
TRML Terminal
TRMT Terminate
TRNG Training
TRNSP Transport
TROF Trough
TROP Tropopause
TRPCD Tropical Continental (air mass)
TRPCL Tropical
TRPLYR Trapping Layer
TRRN Terrain
TRSA Terminal Radar Service Area
TRSN Transition
TRTD Treated
TS Team Supervisor
TS Thunderstorm
TSA Transportation Security Administration
TSATLC TransAtlantic
TSEC Terminal Secondary Radar Beacon
TSFR Transfer
TSGR Thunderstorm with Hail
TSGS Thunderstorm with Small Hail
TSMNO Transmitting Capability out of Service
TSMOK Transmitting Capability Returned to Service
TSNO Thunderstorm Information Not Available
TSNT Transient
TSO Technical Standard Order
TSPAC TransPacific
TSPL Thunderstorm with Ice Pellets
TSRA Thunderstorm with Rain
TSSA Thunderstorm with Duststorm or sandstorm
TSSN Thunderstorm with Snow
TSTM Thunderstorm
TT Teletypewriter
TTS Teletype Switching Facilities
TTY Teletypewriter Station
TURB Turbulence
TURBC Turbulence
TURBT Turbulent
TVASIS T Visual Approach Slope Indicator System
TVL Travel
TVOR Terminal VOR
TWD Toward
TWEB Transcribed Weather Broadcast
TWI Twilight
TWR Aerodrome Control Tower
TWR Tower
TWRG Towering
TWS Radar Track While Scan
TWX Teletypewriter Exchange Service
TWY Taxiway
TWYL Taxiway Link
TXG Taxiing
TXL Taxilane
TXT Text
TYP Type Aircraft
TYPH Typhoon
TYPNO Teletypewriter Communications Out of Service
TYPOK Teletypewriter Communications Returned to Service

U
U Intensity Unknown (weather reports only)
U/S Unserviceable
UA Routine PIREP
UA Unable to approve arrival for the time specified
UAB Until Advised By
UAC Upper Area Control Center
UAG Upper Atmosphere Geophysics
UAR Upper Air Route
UAS Unmanned Aircraft Systems
UAT Until Advised by the Tower
UCDWN Until Cleared Down
UCLT Until Cleared to Land by the Tower
UD Unable to approve departure for the time specified
UDDF Up and Down Drafts
UDF Ultra High Frequency Direction Finding Station
UERE User Equivalent Range Error
UFA Until Further Advised
UFN Until Further Notice
UFO Unidentified Flying Object
UHA Unable Higher Altitude
UHDODT Unable Higher Due Opposite Direction Traffic
UHDSDT Unable Higher Due Same Direction Traffic
UHDT Unable Higher Due Traffic
UHDT Unable Higher Due Traffic
UHF Ultra High Frequency
UIC Upper Information Center
UIR Upper Flight Information Region
ULDT Unable Lower Due Traffic
ULR Ultra Long Range
UM Unable to Maintain
UN Unable
UNA Unable
UNAP Unable to Approve
UNAPV Unable to Approve
UNAR Unable to Approve Altitude Requested
UNATNDD Unattended
UNAVBL Unavailable
UNCC Unable to Contact Company Radio
UNDLD Undelivered
UNEC Unnecessary
UNHRD Unheard
UNID Unidentified
UNKN Unknown
UNL Unlimited
UNLGTD Unlighted
UNMON Unable to Monitor
UNMON Unmonitored
UNOFFL Unofficial
UNRDBL Unreadable
UNREL Unreliable
UNRELBL Unreliable
UNRR Unable to Approve Route Requested
UNRSTD Unrestricted
UNSATFY Unsatisfactory
UNSBL Unseasonable
UNSKED Unscheduled
UNSTBL Unstable
UNSTDY Unsteady
UNSTL Unsettle
UNTC Unable to Establish Contact
UNUSBL Unusable
UP Unknown Precipitation
UPDFTS Up Drafts
UPDT Update
UPR Upper
UPSLP Upslope
UPSTRM Upstream
UQOT Unquote
URAUZ You are authorized
URG Urgent
URIZR Your recommendation is requested
U/S Unserviceable
USA U.S. Army
USAF U.S. Air Force
USAFIB U.S. Army Aviation Flight Information
USBL Usable
USCG U.S. Coast Guard
USMC U.S. Marine Corps
USN U.S. Navy
USNO United States Naval Observatory
USNOF United States NOTAM Office
USNS United States NOTAM System
USP Urgent Special Observation (weather reports only)
UTA Upper control area
UTC Coordinated Universal Time
UTCOK Coordinated Universal Time Coordinate Check Completed
UUA Urgent PIREP
UVV Upward Vertical Velocity
UW Upwind
UWNDS Upper Winds

V
V Variable (weather reports only)
VA Victor Airways
VA Volcanic Ash
VAC Visual Approach Chart
VACAPES Virginia Capes
VADA VFR Arrival Delay Advisory
VAL Valleys
VAN Runway control van
VAPS V/STOL Approach System
VAR Magnetic Variation
VAR Visual Aural Radio Range
VARN Variation
VASI Visual Approach Slope Indicator
VASIS Visual Approach Slope Indicator System
VC Vicinity
VCFG Fog in Vicinity
VCNTY Vicinity
VCOT VFR Conditions On Top
VCTR Vector
VDF Very High Frequency Direction Finding Station
VDOP Vertical Dilution of Precision
VDP Visual Descent Point
VER Vertical
VF Maintaining Visual Flight
VFLT Visual Flight
VFPR Via Flight Planned Route
VFR Visual Flight Rules
VFRSA VFR Restrictions Still Apply
VFY Verify
VHF Very High Frequency
VIA By way of
VIP Very Important Person
VIP Visual Integrated Presentation
VIS Visibility
VLCTY Velocity
VLF Very Low Frequency
VLFD Via Low Frequency Direct
VLNT Violent
VLR Very Long Range
VLY Valley
VM Voice Modulation
VMC Visual Meteorological Conditions
VNAV Vertical Navigation
VOD Via Omni Direct
VOL Volume
VOLMET Meteorological information for aircraft in flight
VOPR Voice Operated Relay
VOR Very High Frequency Omnidirectional Range
VOR APPR VOR Approach
VOR/DME Very High Frequency Omnidirectional Range Collocated with Distance Measuring Equipment
VOR/DME VHF Omnidirectional Range/Distance Measuring Equipment
VOR/DME VOR and DME (collocated)
VOROC VOR On Course
VORTAC Very High Frequency Omnidirectional Range Collocated Tactical Air
VORTAC VOR and TACAN (collocated)
VORTAC VOR collocated with TACAN
VOT VOR airborne equipment test facility
VOT VOR Test Facility
VOT VOR Test signal
VOT Vorticity
VOU Voucher
VR Veer
VR VFR military training routes
VRB Variable
VRBL Variable
VRG Visual Reference Gate
VRISL Vancouver Island, BC
VRT MOTN Vertical Motion
VSA By visual reference to the ground
VSB Visible
VSBY Visibility
VSBYDR Visibility Decreasing Rapidly
VSBYIR Visibility Increasing Rapidly
VSL Vessel
VSP Vertical Speed
VSPI Visual Glide path Indicator
VSTOL Vertical/Short Takeoff and Landing
VTOL Vertical Takeoff and Landing
VV Vertical Visibility (indefinite ceiling)

W
W Warm (air mass)
W West or western longitude
W White
WA AIRMET
WAAS Wide Area Augmentation System
WAC World Aeronautical Chart
WAFC World Area Forecast Center
WAIOP Will Accept If Offered the Position
WB Westbound
WBAR Wing Bar Lights
WBND Westbound
WBRBN Will Be Reported by NOTAM
WBRH Weather Bureau Regional Headquarters
WBTS Whereabouts
WCLC Watch Check List Completed
WDC1 World Data Centers in Western Europe
WDC2 World Data Centers throughout rest of world
WDI Wind Direction Indicator
WDLY Widely
WDSPR Widespread
WDSPRD Widespread
WEA Weather
WEF With Effect From
WFO Weather Forecast Office
WFP Warm Front Passage
WG Working Group
WGS World Geodetic System
WGS84 World Geodetic System 1984
WI Within
WIBIS Will Be Issued
WICA While in Control Area
WICZ While in Control Zone
WID Width
WIE With Immediate Effect
WILCO Will Comply
WINT Winter
WINTEM Forecast upper wind and temperature for aviation
WIP Work In Progress
WK Weak
WKDAY Weekday
WKEND Weekend
WKN Weaken
WL Will
WLAV Will Advise
WMO World Meteorological Organization
WMSC Weather Message Switching Center
WND Wind
WNW West North West
WNWRN West North Western
WNWWD West North Westward
WO Washington Office
WO Without
WP Waypoint
WPLTO Western Plateau
WPM Words Per Minute
WPRT Waypoint Report
WPT Waypoint
WR Wet Runway
WRC Well to Right of Course
WRM Warm
WRMFNT Warm Front
WRNG Warning
WRS Worse
WS SIGMET
WS Weak Signals
WS Wind Shear
WSCMO Weather Service Contract Meteorological Observatory
WSHFT Wind Shift
WSO Weather Service Office
WSOM Weather Service Operations Manual
WSP Weather System Processor (replacement for LLWAS)
WSR Wet Snow on Runway
WSSF National Weather Service Support Facility
WSSU National Weather Service Support Unit
WSTCH Wash Range
WSW West South west
WSWRN West South Western
WSWWD West South Westward
WT Weight
WTR Water
WTR Well To Right
WTSPT Waterspout
WU Western Union Telegraph Company
WV Wave
WV Wind at altitude (PIREP only)
WW Severe weather forecast
WWW World Wide Web
WX Weather
WX Weather at altitude (PIREP only)
WXCON Weather reconnaissance flight pilot report
WYAIO Will You Accept if Offered the Position of

Pilot NOTAM Acronyms