Message-ID: <c=US%a=_%p=CDI_Corporation%l=CDIM-PTS-MAIL-990121212420Z-6949@cdim-pts-mail.ports-va.marine.cdicorp.com>
From: "Rumburg, William" <wrumburg@cdicorp.com>
To: "'lancair.list@olsusa.com'" <lancair.list@olsusa.com>
Subject: Weathersealing Close-out Bulkhead Penetrations on the 320/360 
Date: Thu, 21 Jan 1999 16:24:20 -0500
Mime-Version: 1.0

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
   Here is an easy method for weathersealing aileron and flap pushrod
and inner gear door bracket penetrations in the 320/360 close-out
bulkhead (It can also seal small "moving part" penetrations on the IV-P
which are causing pressurization leaks): 1) Obtain a used inner tube at
a local truck tire service company (automobile inner tubes don't exist).
The tubes are almost always in like-new condition, as opposed to the
tires. They're about 1/16" thick and have just the right flexibility. 2)
Use scissors to cut out a piece large enough to cover the penetration
area, with about 1/2" excess for gluing all around. 3) Cut an adequately
sized "X" (or similar scheme) in the piece, so as to permit the pushrod
(or bracket) to penetrate and just accommodate the range of movement. 4)
With the pushrod (or bracket) removed, glue the penetration cover in
place and allow the glue to fully cure. This can be on either side (or
both sides) of the bulkhead, as the location permits. 5) Reinstall the
pushrod (or bracket) and check for adequacy of seal. Obviously this will
not be a perfect seal, but will function well, depending on how well it
was thought-out, cut, etc. I also used this method to successfully seal
a pressurization leak at the door hinge penetration on Dennis Pratt's
IV-P.
                         Bill Rumburg
                         N403WR  (Sonic Boom)