From: Jimnordin@aol.com
Message-ID: <0.cbb8081e.25730724@aol.com>
Date: Sun, 28 Nov 1999 17:31:00 EST
Subject: Over center link alignment on 360FB
To: lancair.list@olsusa.com
Mime-Version: 1.0

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360 FB Builders..

I have a problem with the alignment of the GM4 bracket causing interference 
with the hydraulic ram rod end when extended. 

I mounted the GM4 to the primary (GM12) and secondary attach points (phenolic 
block) as instructed. I cleaned up the aft surface of the phenolic so the GM4 
would fit flush (overhanging fiberglass etc). After installation of the main 
landing gear and it's alignment (chapter 5) I began fitting the hydraulics 
and the over center link assembly. When the hydraulic ram is attached to the 
assembly, the rod end on the hydraulic ram interfers with the aluminum tabs 
(main retract cylinder attach point) of the assembly when the ram is brought 
to the specified 1.25 inches from the closeout rib of the spar. This is the 
cylindrical phenolic standoff I'm talking about (5-58).

Trying to figure out what causes the interference, I looked from above the 
GM4 and sited down from the top spar. The GM4 where it attaches to the GM12 
is nearly flush, 1/16", aft of the trailing edge of the top front spar cap. 
The aft side of the inboard end of GM4 is fully 5/16" behind the trailing 
edge of the top front spar cap making it 1/4" aft of the outboard aft edge. 
This seems to be the cause of the interference on the aluminum attach tabs 
with the rod end. 

If the GM4 bracket were flush with the trailing edge (as is the outboard 
end), there'd be no interference. Is there triming of the phenolic secondary 
attach point to be made to cure this problem?  Or do I simply make the 
cylindrical phenolic standoff 1.5 inches rather than 1.25 inches? Bottom 
line.. how do I best cure the problem?

Page 5-61 bottom suggest to "Pull the over ctr link into the approx retract 
pos and check for a "no bind" condition". No suggestion how to cure it 
however...

Thanks for the help.... jim nordin
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