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Terms for subject Aviation (1835 entries)

VHF omnidirectional range station	A ground-based electronic NAVAID that transmits very high frequency navigation signals 360° in azimuth
visibility	The distance at which prominent unlighted objects may be identified by day and prominent lighted objects may be identified by night
Visual approach	An approach wherein an aircraft on an IFR flight plan (FP) operating in visual meteorological conditions (VMC) under the control of ATC and having ATC authorization, may proceed to the airport of destination
visual approach slope indicator	A visual glide slope indicator (VGSI) consisting of four light units normally situated on the left side of the runway in the form of two wing bars, referred to as the upwind and downwind wing bars, and indicating that the aircraft is on slope if the upwind bar shows red and the downwind bar shows white, too high if both bars show white, and too low if both bars show red.
visual descent point	A defined point on the final approach course of a nonprecision [s/c] straight-in approach procedure from which normal descent from the minimum descent altitude (MDA) to the runway touchdown point may be commenced, provided the approach threshold of that runway, or approach lights, or other markings identifiable with the approach end of that runway are clearly visible to the pilot
visual flight rules	The rules that govern the procedures for conducting flight under visual conditions
visual glide slope indicator	An aerodrome lighting facility providing vertical visual approach slope guidance to aircraft during the approach to landing by displaying a pattern of red and white light beams that give an indication to pilots of their position in relation to the established approach slope, depending on the combinations of lights that are seen
visual holding	The holding of aircraft in an orbital path around selected prominent geographical locations that can be easily recognized from the air
visual inspection of fuselage, engines, wings, aircraft tail		Christ­ine_A
visual separation	A means used by controllers to separate aircraft operating in visual meteorological conditions (VMC) VFR—The controller, having determined that a potential conflict exists, issues clearances, instructions and/or information as necessary to aid aircraft in establishing visual contact with each other or to assist aircraft in avoiding other aircraft. (b) IFR or CVFR—Following a pilot’s report that the traffic is in sight, the controller issues the clearance and instructs the pilot to provide his or her own separation by manoeuvring the aircraft as necessary to avoid or follow the traffic.
Vk	Target velocity
Vmax	Maximum possible speed for that altitude
Vmaxp	Maximum sustainable speed for a given altitude
Vmin	Slowest practical speed
VOLMET	Specific meteorological information provided to international air traffic
VOR station	A ground-based electronic NAVAID that transmits very high frequency navigation signals 360° in azimuth
VORTAC	Combination of VOR and TACAN
VTOL aircraft	An aircraft capable of vertical climbs and descents and of using very short runways or small areas for takeoff and landing. These aircraft include, but are not limited to, helicopters.
w/l	working line
w/o	Work Order	Zealot­2002