How Does Papi Work? — Tech Ops Forum

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How Does Papi Work?

Coolair From United States, joined Jun 2001, 51 posts, RR: 0
Posted (8 years 1 month 5 days 15 hours ago) and read 1310 times:

I'm just curious how PAPI work... does it have radar or something that it knows when to change the lights etc?

9 replies: All unread, jump to last

Cosync From Mexico, joined Nov 2001, 556 posts, RR: 0
Reply 1, posted (8 years 1 month 5 days 15 hours ago) and read 1271 times:

is papi the lights that show ur aproach?

Ralgha From United States, joined Nov 1999, 1614 posts, RR: 7
Reply 2, posted (8 years 1 month 5 days 15 hours ago) and read 1264 times:

PAPI, as well as every other type of visual glideslope indicator, are mearly a set of lights that are angled and shielded in such a way that you see red or white depending on your angle to the lights.

Now comes the stream of responses giving you way more information than you asked for. Big thumbs up

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

Cosync From Mexico, joined Nov 2001, 556 posts, RR: 0
Reply 3, posted (8 years 1 month 5 days 15 hours ago) and read 1254 times:

well from my little understanding there are two lights and there are codes to tell you if u r too high/low or on track. if the to lights are red u are two low if both lights are white u are two high adn if one light is red and the other is white u are good to land

310_engineer From Belgium, joined Dec 2000, 165 posts, RR: 0
Reply 4, posted (8 years 1 month 5 days 13 hours ago) and read 1263 times:

Papi doesn't work anymore, he retired 5 years ago. Smile/happy/getting dizzy

Goldenshield From United States, joined Jan 2001, 4067 posts, RR: 13
Reply 5, posted (8 years 1 month 4 days 23 hours ago) and read 1220 times:

You guys made me dig out my FAR/AIM which will expire in a month!

PAPI is short for Precision Approah Path Indicator.

it looks like this: O O O O / O O O O

basically, it tells you your approach angle, and gives you 5 indications of your angle.

I like this system, but there is nothing better than to eyeball it yourself! Big thumbs up

"I heard that there are rumors on the internets" -- G. W. Bush at the second 2004 debate

Ts-ior From Tunisia, joined Oct 2001, 2904 posts, RR: 9
Reply 6, posted (8 years 1 month 4 days 20 hours ago) and read 1203 times:

Good interpretation of the question!!!

Cosync From Mexico, joined Nov 2001, 556 posts, RR: 0
Reply 7, posted (8 years 1 month 4 days 20 hours ago) and read 1200 times:

oh ok i was thinking of vasi
derrrrr

Coolair From United States, joined Jun 2001, 51 posts, RR: 0
Reply 8, posted (8 years 1 month 4 days 12 hours ago) and read 1176 times:

Another question.. how does LCVASI (Low Cost Visual Approach Slope Indicator) work?

Goldenshield From United States, joined Jan 2001, 4067 posts, RR: 13
Reply 9, posted (8 years 1 month 3 days 6 hours ago) and read 1131 times:

I've never heard about what you're about, but there are 5 different visual system (6 if you include your internal system!).

VASI = Visual Approach Slope Indicator
OO /
/
OO /

of which has many variations

PAPI (see my previous reply)

Tri-color: one light that provide 3 colors to help aid in the angle.

Pulsating systems: One light that pulses or is a steady red or white light depending on the angle.

And Alignment of Elements: where 3 objects are set in a way to provide a glideslope (day only!).

gs

"I heard that there are rumors on the internets" -- G. W. Bush at the second 2004 debate

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