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("White over red" isn't actually possible unless the VASI installation is badly off, the white and red filtered glasses on the lights were fitted upside down by accident, or else if the pilot is accidentally flying upside-down on final.)<ref>{{Cite web |url=http://aviation.stackexchange.com/questions/33151/what-does-a-white-over-red-vasi-indicate |title=What does a white over red VASI indicate? |website=Aviation StackExchange |access-date=2016-11-14}}</ref>
==Pulsating VASI==
The pulsating visual approach slope indicator (PVASI) is a system similar in purpose to a VASI, but only consists of one piece of equipment. It indicates the pilots height on approach with a mix of red and white, steady and pulsating light. Pulsating white light indicates that the aircraft is too high, whereas steady white indicates being on glide path. Steady red light is meant to show a position only slightly below glide path, with pulsating red light being indicative of a position well below glide path.<ref>{{Cite book |url=https://www.columbus.af.mil/Portals/39/documents/New%20Students/FIH_1MAR18.pdf#page=90 |title=DoD Flight Information Publication (Enroute) - Flight Information Handbook |publisher=[[National Geospatial-Intelligence Agency]] |year=2018 |location=St. Louis, Missouri |pages=B-34 |archive-url=https://web.archive.org/web/20210829190252/https://www.columbus.af.mil/Portals/39/documents/New%20Students/FIH_1MAR18.pdf |archive-date=2021-08-29 |url-status=live}}</ref> This type of system is less prevalent than other visual glide slope indicators like regular VASIs or PAPIs, as of April 2022 there were only 83 PVASIs installed at 50 airports in the United States and its territories according to [[Federal Aviation Administration]] data, compared to 6729 PAPIs and 625 VASIs.<ref>{{Cite web |title=Airport Data and Information Portal |url=https://adip.faa.gov/agis/public/#/public |access-date=2022-04-28 |website=adip.faa.gov |publisher=[[Federal Aviation Administration]]}}</ref>
==See also==
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