Visual approach slope indicator: Difference between revisions

Revision as of 06:56, 9 May 2022

Revision as of 09:20, 9 May 2022

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==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 AprilMay 2022 there were only 8384 PVASIs installed at 5051 airports and heliports in the United States and its territories according to [[Federal Aviation Administration]] data, compared to 67296730 PAPIs and 625623 VASIs.<ref>{{Cite web |title=Airport Data and Information Portal |url=https://adip.faa.gov/agis/public/#/public |access-date=2022-0405-2809 |website=adip.faa.gov |publisher=[[Federal Aviation Administration]]}}</ref>

==See also==