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SAR . . . . . . . Search and Rescue
SAS . . . . . . . Stability Augmentation System
SBAS . . . . . . Satellite−based Augmentation System
SCAT−1
DGPS . . . . . . Special Category I Differential GPS
SDF . . . . . . . Simplified Directional Facility
SFL . . . . . . . . Sequenced Flashing Lights
SFR . . . . . . . Special Flight Rules
SIAP . . . . . . . Standard Instrument Approach Procedure
SID . . . . . . . . Standard Instrument Departure
SIGMET . . . . Significant Meteorological Information
SM . . . . . . . . Statute Mile
SMGCS . . . . Surface Movement Guidance Control
System
SNR . . . . . . . Signal−to−noise Ratio
SOIA . . . . . . Simultaneous Offset Instrument
Approaches
SOP . . . . . . . Standard Operating Procedure
SPC . . . . . . . Storm Prediction Center
SPS . . . . . . . . Standard Positioning Service
STAR . . . . . . Standard Terminal Arrival
STARS . . . . . Standard Terminal Automation
Replacement System
STMP . . . . . . Special Traffic Management Program
SWSL . . . . . . Supplemental Weather Service Locations
TA . . . . . . . . . Traffic Advisory
TAA . . . . . . . Terminal Arrival Area
TAC . . . . . . . Terminal Area Chart
TACAN . . . . Tactical Air Navigation
TAF . . . . . . . Aerodrome Forecast
TAS . . . . . . . True Air Speed
TCAS . . . . . . Traffic Alert and Collision Avoidance
System
TCH . . . . . . . Threshold Crossing Height
TD . . . . . . . . Time Difference
TDLS . . . . . . Tower Data Link System
TDWR . . . . . Terminal Doppler Weather Radar
TDZL . . . . . . Touchdown Zone Lights
TEC . . . . . . . Tower En Route Control
Abbreviation/
Acronym
Meaning
TIBS . . . . . . . Telephone Information Briefing Service
TIPH . . . . . . . Taxi into Position and Hold
TIS . . . . . . . . Traffic Information Service
TIS−B . . . . . . Traffic Information Service−Broadcast
TLS . . . . . . . Transponder Landing System
TPP . . . . . . . . Terminal Procedures Publications
TRSA . . . . . . Terminal Radar Service Area
TSO . . . . . . . Technical Standard Order
TWEB . . . . . Transcribed Weather Broadcast
TWIB . . . . . . Terminal Weather Information for Pilots
System
UA . . . . . . . . Unmanned Aircraft
UAS . . . . . . . Unmanned Aircraft System
UAV . . . . . . . Unmanned Aerial Vehicle
UFO . . . . . . . Unidentified Flying Object
UHF . . . . . . . Ultrahigh Frequency
U.S. . . . . . . . United States
USCG . . . . . . United States Coast Guard
UTC . . . . . . . Coordinated Universal Time
UWS . . . . . . . Urgent Weather SIGMET
VAR . . . . . . . Volcanic Activity Reporting
VASI . . . . . . . Visual Approach Slope Indicator
VCOA . . . . . Visual Climb Over the Airport
VDA . . . . . . . Vertical Descent Angle
VDP . . . . . . . Visual Descent Point
VFR . . . . . . . Visual Flight Rules
VGSI . . . . . . Visual Glide Slope Indicator
VHF . . . . . . . Very High Frequency
VIP . . . . . . . . Video Integrator Processor
VMC . . . . . . Visual Meteorological Conditions
VMINI . . . . . . Instrument flight minimum speed, utilized
in complying with minimum limit speed
requirements for instrument flight
VNAV . . . . . . Vertical Navigation
VNE . . . . . . . Never exceed speed
VNEI . . . . . . . Instrument flight never exceed speed,
utilized instead of VNE for compliance with
maximum limit speed requirements for
instrument flight
VOR . . . . . . . Very High Frequency Omni−directional
Range
VORTAC . . . VHF Omni−directional Range/Tactical Air
Navigation
VOT . . . . . . . VOR Test Facility
VR . . . . . . . . VFR Military Training Route
VREF . . . . . . . . . The reference landing approach speed,
usually about 1.3 times Vso plus 50 percent
of the wind gust speed in excess of the
mean wind speed.
A71I1M0.65R CHG 2 37//1315//078
2/14/08 AIM
Abbreviations/Acronyms Appendix 4−5
Abbreviation/
Acronym
Meaning
VSO . . . . . . . . . . The stalling speed or the minimum steady
flight speed in the landing configuration at
maximum weight.
VTF . . . . . . . Vector to Final
VV . . . . . . . . Vertical Visibility
VVI . . . . . . . Vertical Velocity Indicator
VY . . . . . . . . Speed for best rate of climb
VYI . . . . . . . . Instrument climb speed, utilized instead of
VY for compliance with the climb
requirements for instrument flight
WA . . . . . . . . AIRMET
WAAS . . . . . Wide Area Augmentation System
WAC . . . . . . . World Aeronautical Chart
WFO . . . . . . . Weather Forecast Office
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