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I am trying to compare a VASI-4 light system with a PAPI lights. I know that 2White-2Red is the pattern that indicates that the aircraft is on the glideslope; more reds mean lower and more white means higher than the desired glideslope height. With relations to that, how should the VASI lights be on a correct/incorrect approach?

P.S. My question is specific to VASI-4 light system aka 2-bar VASI.

UPDATE I found this from FAA that may very well be the answer, but an explanation would be great.


marked as duplicate by FreeMan, Federico, vasin1987, Danny Beckett, Farhan Mar 17 '15 at 13:06

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  • $\begingroup$ @FreeMan I didn't ask for how they work. I don't see this as a duplicate. I asked for the sources that confirms what the correct indication for 2-bar VASIs should be $\endgroup$ – hagubear Mar 17 '15 at 12:43
  • 1
    $\begingroup$ The sources are contained in the answers of the other question. $\endgroup$ – Federico Mar 17 '15 at 12:50

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