. abbreviation: UNICOM
Fr: communications universelles
unmanned aerial vehicle A powered, aerial vehicle that does not carry a human operator, uses aerodynamic forces to provide vehicle lift, can fly autonomously or be piloted remotely, can be expendable or recoverable, and can carry a lethal or non-lethal payload.
.
abbreviation: UAV
.
also called: uninhabited aerial vehicle, uninhabited air vehicle, unmanned air vehicle
Fr: véhicle aérien sans pilote
unmanned air vehicle Other expression for: unmanned aerial vehicle
. abbreviation: UAV
UPS Abbreviation for: uninterruptible power supply Fr: UPS
upwind leg
A flight path parallel to the landing runway in the direction of landing.
Fr: étape vent debout
urgent PIREP A pilot report containing weather information significant to the safety of flight. An urgent PIREP includes information on the following:
(a)
volcanic ash;
(b)
tornadoes, funnel clouds, waterspouts;
(c)
severe turbulence;
(d)
severe icing;
(e)
hail;
(f)
low-level wind shear; and
(g)
any other reported weather phenomena considered to be hazardous or potentially hazardous to flight operations.
Fr: PIREP urgent
user agency The agency, organization or military command responsible for the activity for which Class F airspace has been provided. The user agency shall be identified for Class F restricted areas, military operations areas, and danger areas and, where possible, should be identified for Class F advisory areas. Fr: organisme utilisateur
UTC Written abbreviation for: Co-Ordinated Universal Time . other written abbreviation: Z Fr: UTC
V
VASIS Abbreviation for: visual approach slope indicator system Fr: VASIS
VCS Abbreviation for: vehicle control service Fr: VCS
VDF service Abbreviation for: VHF direction-finding service Fr: service VDF
VDP U.S.: Abbreviation for: visual descent point
vector A heading given by a controller to a pilot on the basis of radar-derived information to provide navigational guidance.
. also called: radar vectoring
Fr: vecteur
vehicle control service The provision, by FSSs, of commands and instructions to control the movements of ground traffic on manoeuvring areas at designated uncontrolled aerodromes.
. abbreviation: VCS
Fr: service de contr.le de véhicules
vehicle corridor A space delineated by parallel, 5.9-in.-wide, solid white lines spaced 24.6 ft apart to provide guidance to vehicle and equipment operators. Fr: corridor pour véhicules
vented fuel
ICAO: Usable fuel that is intentionally or unintentionally released while the aircraft is airborne.
Fr: décharge de carburant
“Verify your altitude”
An expression used by ATC to validate the altitude readouts from the aircraft’s encoding transponder.
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