Civil aviation dictionary
Aviation glossary
Terms, abbreviations and procedures explained without unnecessary jargon, with English names and clear definitions.
- Total entries
- 2480
- Terms
- 435
- Abbreviations
- 2045
U
- Abbreviationunknown precipitation
UP stands for unknown precipitation in FAA terminology.
- Abbreviationunmanned aircraft system
UAS stands for unmanned aircraft system in FAA terminology.
- AbbreviationUnmanned Aircraft Systems
UAS stands for Unmanned Aircraft Systems in FAA terminology.
- OperationsUNPUBLISHED ROUTE
A route for which no minimum altitude is published or charted for pilot use.
- NavigationUNRELIABLE (GPS/WAAS)
An advisory to pilots indicating the expected level of service of the GPS and/or WAAS may not be available.
- Abbreviationuntil advised by
UAB stands for until advised by in FAA terminology.
- Abbreviationuntil advised by the tower
UAT stands for until advised by the tower in FAA terminology.
- Abbreviationup drafts
UPDFTS stands for up drafts in FAA terminology.
- Abbreviationupper air route
UAR stands for upper air route in FAA terminology.
- Abbreviationupper area control center
UAC stands for upper area control center in FAA terminology.
- Abbreviationupper control area
UTA stands for upper control area in FAA terminology.
- Abbreviationupper flight information region
UIR stands for upper flight information region in FAA terminology.
- Abbreviationupper winds
UWNDS stands for upper winds in FAA terminology.
- Abbreviationupper winds obs. (by radio methods)
RAWIN stands for upper winds obs. (by radio methods) in FAA terminology.
- Abbreviationupwind
UW stands for upwind in FAA terminology.
- AbbreviationUrgency signal
The international radiotelephony urgency signal.
- Abbreviationurgent PIREP
UUA stands for urgent PIREP in FAA terminology.
- Abbreviationurgent special observation (weather reports only)
USP stands for urgent special observation (weather reports only) in FAA terminology.
V
- AbbreviationV/STOL approach system
VAPS stands for V/STOL approach system in FAA terminology.
- AbbreviationVariable (weather reports only)
V stands for Variable (weather reports only) in FAA terminology.
- AbbreviationVERIFY
VFY stands for VERIFY in FAA terminology.
- Flying skillsVERIFY SPECIFIC DIRECTION OF TAKEOFF (OR TURNS AFTER TAKEOFF)
Used by ATC to ascertain an aircraft's direction of takeoff and/or direction of turn after takeoff.
- Abbreviationvertical motion
VRT MOTN stands for vertical motion in FAA terminology.
- AbbreviationVertical Navigation
Vertical guidance along a calculated flight profile.