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Papi System + Car In Fron Of It.  
User currently offlineFP_v2 From , joined Dec 1969, posts, RR:
Posted (13 years 7 months 2 weeks 5 days 18 hours ago) and read 1357 times:

Recently while passing near the airport I decided to park my car in front of the runway and wait for any planes that might be landing. Sure enaugh a Dash-8 was on final in no time, but I noticed that the PAPI system was not working in a sence that the lights remained red throughout the approach. Could my car(being metal) somehow confuse the PAPI to think I was an aircraft on the runway instead of traacking the landing a/c?

8 replies: All unread, jump to last
 
User currently offlineKonaB777 From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 7 months 2 weeks 5 days 18 hours ago) and read 1326 times:

There are different light signals sent out for whatever altitude you are i.e.: all light signals are being sent out all at the same time, the red signal you were seeing was being displayed to you because you were "low" on the glideslope.

User currently offlineFP_v2 From , joined Dec 1969, posts, RR:
Reply 2, posted (13 years 7 months 2 weeks 5 days 18 hours ago) and read 1317 times:

so your saying that while i was seeing all the lights to be red, the landing aircraft was seeing the 2 white/2 red lights indicating to him a propper glideslope at the same time.........how is this possible?

User currently offlineRalgha From United States of America, joined Nov 1999, 1614 posts, RR: 6
Reply 3, posted (13 years 7 months 2 weeks 5 days 16 hours ago) and read 1309 times:

A PAPI displays all the lights at the same time, each one is angled and shielded so you can only see it if you are at the appropriate height on the glideslope Big thumbs up


09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4204 posts, RR: 37
Reply 4, posted (13 years 7 months 2 weeks 5 days 15 hours ago) and read 1300 times:

A PAPI has no transmitter or reciever thing. All that it is is just lights that have lenses on them set so when you are on the glide slope it shows the proper red over white indication. Alot of people think there is some sore of radio transmitter or radar involved..but it is just set lenses. Think of each light as a big colored christmas light with two different colors on it.


Chicks dig winglets.
User currently offlineIainhol From , joined Dec 1969, posts, RR:
Reply 5, posted (13 years 7 months 2 weeks 5 days 4 hours ago) and read 1265 times:

All the really are, is angled lights, the white one is shining high, while the red one is pointing more down.
Iain


User currently offlineFP_v2 From , joined Dec 1969, posts, RR:
Reply 6, posted (13 years 7 months 2 weeks 4 days 22 hours ago) and read 1243 times:

Thanks guys I now understand.

User currently offlinePopFiction From , joined Dec 1969, posts, RR:
Reply 7, posted (13 years 7 months 2 weeks 4 days 18 hours ago) and read 1234 times:

All I can say is:


FOUR RED.....YOU'RE DEAD!!!


User currently offlineMinuteman From United States of America, joined Aug 2000, 271 posts, RR: 0
Reply 8, posted (13 years 7 months 2 weeks 4 days 7 hours ago) and read 1212 times:

This is one I still haven't figured out...how does a PLASI provide both steady and flashing light?

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