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How Do The Papi Lights Work?  
User currently offlineJgore From Argentina, joined Feb 2002, 550 posts, RR: 2
Posted (12 years 6 months 4 weeks 23 hours ago) and read 13578 times:

I'm just wondering how the PAPI lights work.
how they identify an aircraft and thus to give them the proper light information ? do any one know about it ?
thanks.

jgore  Smile/happy/getting dizzy

4 replies: All unread, jump to last
 
User currently offlineFlyf15 From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 6 months 4 weeks 23 hours ago) and read 13560 times:

Much more simple than that.

Each "station"/"light emitter" has a light in a box. There is a metal divider placed in the box that is precisely aligned with what the glideslope should be at that position. Below this metal divider is a red lens. Due to this, if you are above the angle of the metal divider, you see the white light, if you are below it, you see the red light.


User currently offlineJgore From Argentina, joined Feb 2002, 550 posts, RR: 2
Reply 2, posted (12 years 6 months 4 weeks 22 hours ago) and read 13549 times:

oooooooo i see,. thanks


User currently offlineAv8trxx From United States of America, joined Nov 2001, 657 posts, RR: 6
Reply 3, posted (12 years 6 months 4 weeks 22 hours ago) and read 13545 times:

Yes, the PAPI itself does not "identify an aircraft and thus to give them the proper light information", but rather the pilot identifies their position on the glideslope by the colors visible on the PAPI. Perhaps these diagrams & explainations will help:
http://www.bayareapilot.com/vasiPAPI.htm


User currently offlineJgore From Argentina, joined Feb 2002, 550 posts, RR: 2
Reply 4, posted (12 years 6 months 4 weeks 22 hours ago) and read 13541 times:

yeah i know it, the pilot has to watch on the papi lights.


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