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Line 3: The '''visual approach slope indicator''' ('''VASI''') is a system of [[Electric light\|lights]] on the side of an airport [[runway]] threshold that provides visual [[descent (aircraft)\|descent]] guidance information during [[final approach]]. These lights may be visible from up to {{convert\|8\|km\|mi}} during the day and up to {{convert\|32\|km\|mi}} or more at night. ==Standard VASI=== [[Image:Vasi-1.JPG\|thumb\|Standard visual approach slope indicator (circled in red)]] [[Image:Visual Landing Lighting System 1.jpg\|thumb\|Working VASI]]

Visual approach slope indicator: Difference between revisions