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Date: Thu, 14 Oct 1999 09:54:41 -0500
From: jerry@mc.net
To: "Rumburg, William" <wrumburg@cdicorp.com>,
 	"lancair.list" <lancair.list@olsusa.com>
Subject: Re: LNC2 SB050-0999
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To:  William Rumburg and the rest of the LML gang.


Hi Bill....here is a question for you regarding your opinion on your "fix"
quoted below.


"I still maintain that a full-width secondary attach point is far
preferable to this "fix". Breaking out an existing attach block is no
picnic
either, but if you have to go in and do it, you may as well do it right."


When you say full-width do you mean this......a full-width piece of
phenolic applied ONLY TO the trailing edge of the BOTTOM cap of the spar?
If this is so what would be the length what would be the height, how thick,
how many bids, would it go all the way to the main mount phenolic and
tied-in there?  Lots of questions here I know.

Here's a helpful thought, maybe......because it is so difficult to work
with the 4 nuts, washers and bolts for the main gear pivot bearing
bracket/mount consider this, Bill.  (I have not done this but may).

Rivet 4 nut plates on an aluminum sheet metal piece so the nuts center on
the 4 mounting holes.  Then place this on the front side of the phenolic
main mount.  Install the bolts from the gear well side, making sure the
threaded ends don't rub on the push rods.  Would there be enough clearance
with the push rods/bolt ends?

The benefits are obvious especially when removal is done months after
flying.  Boeing does a similar thing for the hundreds of bolts holding the
windshields in.

Please let us hear comments from you, Bill, and from everyone else, as
well.

Jerry Grimmonpre'       LNC2


[I was going to suggest the mounting of nutplates to a card (either 6-BID
or .050 AL) which could be Hysol'ed onto the front side of the GM4 main
attach area as well, but you beat me to the punch!  The use of drilled-
head fasteners and safety wire would insure their integrity and would
really simplify the GM4 installation and removal process.  I may just go
ahead and do this when I remove my gear to apply the subject SB.  I think
it's a great idea.  I don't think that there will be any clearance issues
at all, as the ultimate depth of the fasteners shouldn't change a bit.

     <Marv>     ]

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