ual777contrail
Posts: 2914
Joined: Sun Feb 17, 2002 11:33 am

What Is This? On A UAL 777

Sun Aug 25, 2002 1:48 am

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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thanks


ual 777 contrail
 
l'espace180
Posts: 400
Joined: Mon Sep 18, 2000 9:55 am

RE: What Is This? On A UAL 777

Sun Aug 25, 2002 5:12 am

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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ual777contrail
Posts: 2914
Joined: Sun Feb 17, 2002 11:33 am

RE: What Is This? On A UAL 777

Sun Aug 25, 2002 6:39 am

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
Posts: 244
Joined: Thu Sep 13, 2001 12:15 am

RE: What Is This? On A UAL 777

Sun Aug 25, 2002 7:01 am

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
Fwd to MCO and Placard
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: What Is This? On A UAL 777

Sun Aug 25, 2002 2:19 pm

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).

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