Visual approach slope indicator
Runway light set / From Wikipedia, the free encyclopedia
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"VASI" redirects here. For other uses, see Vasi.
The visual approach slope indicator (VASI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during final approach. These lights may be visible from up to 8 kilometres (5.0 mi) during the day and up to 32 kilometres (20 mi) or more at night.
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