What Is This? On A UAL 777 — Tech Ops Forum

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What Is This? On A UAL 777

Ual777contrail From , joined Dec 1969, posts, RR:
Posted (10 years 9 months 6 days 15 hours ago) and read 3134 times:

I know this plane is in storage,what is this yellow stuff on the tail?
it looked at first like a tie down,now maybe some tape. what is the purpose of this?

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Photo © Chris Banyai-Riepl

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Photo © Chris Banyai-Riepl

thanks

ual 777 contrail

4 replies: All unread, jump to last

L'Espace180 From France, joined Sep 2000, 938 posts, RR: 5
Reply 1, posted (10 years 9 months 6 days 11 hours ago) and read 3072 times:

I guess it's a protection, look at this picture, on the same place as where the tapes are, there are two round things (dunno the use, maybe something to mesure air pressure for the flight instrumen, that's just a guess)

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Photo © Bruce Leibowitz

Ual777contrail From , joined Dec 1969, posts, RR:
Reply 2, posted (10 years 9 months 6 days 10 hours ago) and read 3039 times:

thanks L,
i wonder what those little rings are? i should have looked at another 777 not in storage to see what was under that tape.
i feel another queston coming on,what are those little rings.

thanks again, ual 777 contrail

Atlamt From United States of America, joined Sep 2001, 237 posts, RR: 3
Reply 3, posted (10 years 9 months 6 days 10 hours ago) and read 3030 times:

The rings are just paint showing where the static port is. The actual static port is about the size of a quarter. In storage and during longer maintance checks they are covered to protect them and to keep them from getting clogged.

As for what they do. This page explains it very well. http://www.allstar.fiu.edu/aero/PSSI.htm

Cdfmxtech From United States of America, joined Jul 2000, 1338 posts, RR: 29
Reply 4, posted (10 years 9 months 6 days 2 hours ago) and read 2923 times:

Those static ports are called Gust Supression ports. There are 4 ports (2 on each side). These ports measure differential pressure on both sides of the vertical stabilizer.
These inputs are to detect yaw rate. This system does essentially the same thing as a Yaw Damper, but the B777 doesn't have a system called Yaw Damper. It's called Gust Supression, but it does the same thing (aid in roll control and improves pax comfort).