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Aviation
Aviation, aircraft and air-traffic acronyms explained.
TEC
Tower En Route Control
THL
Takeoff Hold Lights
TIS
Traffic Information Service
TIS-B
Traffic Information Service-Broadcast
TLS
Transponder Landing System
TOC
Transfer of Communications
TPP
Terminal Procedures Publications
TRSA
Terminal Radar Service Area
TRUST
The Recreational UAS Safety Test
TSO
Technical Standard Order
TWIB
Terminal Weather Information for Pilots System
U.S.
United States
UA
Unmanned Aircraft
UAM
Urban Air Mobility
UAS
Unmanned Aircraft System
UASFM
UAS Facility Map
UAV
Unmanned Aerial Vehicle
UFO
Unidentified Flying Object
unusual apparent anomaly in the sky that is not readily identifiable
UHF
Ultrahigh Frequency
USCG
United States Coast Guard
UTC
Coordinated Universal Time
UTM
UAS Traffic Management
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
VLOS
Visual Line of Sight
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
VO
Visual Observer
VOR
Very High Frequency Omni-directional Range