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Terms for subject Aviation (1801 entries)

vertical takeoff and landing 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.
vertigo	The sensation of movement of the body or its surroundings which is at variance with the physical state
very high frequency	The frequency band between 30 and 300 MHz
very low frequency	The frequency band between 3 and 30 kHz
very low level operation	VLL operation	Michae­lBurov
VFR aircraft	An aircraft operated in accordance with visual flight rules
VFR control service	A service provided by ATC units including: (a) tower control; and (b) ground control
VFR flight	A flight conducted in accordance with visual flight rules
VFR holding procedure	The holding of aircraft in an orbital path around selected prominent geographical locations that can be easily recognized from the air
VFR navigation chart	An aeronautical chart (using a scale of 1:500 000) designed for visual navigation of slow- or medium- speed aircraft. Topographic information on these charts features the portrayal of relief and a judicious selection of visual checkpoints for VFR flight. Aeronautical information includes visual and radio aids to navigation, airports, controlled airspace, restricted areas, obstacles, and related data.
VFR over-the-top	A VFR flight during daylight in which a pilot climbs in visual meteorological conditions (VMC) proceeds en route above inclement weather, and descends in VMC at a destination that had been forecast for conditions surpassing VMC fora period extending before and after the estimated time of arrival
VFR terminal area chart	An aeronautical chart (using a scale of 1:250 000) that depicts terminal control area (TCA) airspace, which provides for the control or segregation of all aircraft within the TCA. The chart depicts topographic information and aeronautical information, which includes visual and radio aids to navigation, airports, controlled airspace, restricted areas, obstacles, and related data.
VFR-on-top	ATC authorization for an IFR aircraft to operate in VFR conditions at any appropriate VFR altitude
VHF direction-finding service	A service by which navigation assistance is provided to VFR aircraft, as described in the "Communications" (COM) and "Rules of the Air and Air Traffic Services" (RAC) sections of the Transport Canada Aeronautical Information Manual
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