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<br />Visual approach: an approach wherein an aircraft on an IFR flight plan, <br />operating in VFR conditions under the control of an air traffic facility and having an <br />air traffic control authorization, may proceed to the airport of destination in VFR <br />conditions. <br /> <br />Visual approach slope indicator (V ASI): an airport lighting facility in the <br />terminal area navigation system used primarily under VFR conditions. It provides <br />vertical visual guidance to aircraft during approach and landing, by radiating a <br />pattern of high intensity red and white focused light beams which indicate to the <br />pilot that he/she is above, on, or below the glide path. <br /> <br />Visual flight rules (VFR): rules that govern the procedures for conducting flight <br />under visual conditions. The term VFR is also used in the United States to indicate <br />weather conditions that are equal to or greater than minimum VFR requirements. <br />In addition, it is used by pilots and controllers to indicate type of flight plan. <br /> <br />VORN ery high frequency omnidirectional range station: a ground-based <br />electronic navigation aid transmitting very high frequency navigation signals, 360 <br />degrees in azimuth, oriented from magnetic north. Used as the basis for navigation <br />in the national airspace system. The VOR periodically identifies itself by Morse <br />Code and may have an additional voice identification feature. <br /> <br />VORTACNHF Omnidirectional range/tactical air navigation: a navigation <br />aid providing VOR azimuth, TACAN azimuth, and TACAl'\J distance-measuring <br />equipment (DME) at one site. <br /> <br />B-5 <br />