Message-ID: <3AA72321.61FD7161@dri.edu>
Date: Wed, 07 Mar 2001 22:13:54 -0800
From: peter barber <barber@dri.edu>
To: lancair.list@olsusa.com
Subject: LNC2 Nose Gear Hydraulic Cylinder Installation
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

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The procedure for installing the nose gear hydraulic cylinder seems to
be straightforward. Extend the hydraulic cylinder shaft to its maximum
length, then install the upstop sleeve, the stop nut, and the rod end
bearing (threaded to the midpoint of the threads – about 3/8 “ to allow
for later adjustment). Then insert the bolt through the rod end bearing
that attaches it to the weldment. This will then determine the position
of the static end of the hydraulic cylinder, which hopefully is close to
the center of the embedded phenolic at the top of the nose gear tunnel.
The four holes for the two brackets can then be marked and drilled and
the static end of the hydraulic cylinder can be secured by 4 bolts.

In our case, following this procedure positions the brackets at the
static end of the hydraulic cylinder so far aft that the brackets are
not entirely on the flat part, but rather slide up (the airplane is
upside down) the aft end of the tunnel behind the embedded phenolic. The
only way to get the brackets to lie flat and approximately in the center
of the phenolic is to reverse the static-end brackets (the brackets are
not symmetrical – reversing them moves the mounting bolt farther aft)
and also to thread the rod end bearing all the way down onto the
threaded cylinder shaft, eliminating any future opportunity for
adjustment.

Conversely, if the static end is located in the center of the phenolic
pad with the brackets in the correct orientation and the rod end bearing
only threaded on halfway, the hole in the rod end bearing is about 3/8
of an inch too long to line up with the attach hole in the weldment.

One possible explanation for this problem is that the pivot pin that
secures the weldment is too far aft. However, it appears to be located
as dimensioned on Drawing P and, not coincidentally, produces exactly a
4 degree forward cant to the nose gear strut.

Have any other builders noticed this problem? If so, what is the
recommended way to correct it?

Thanks in advance for any suggestions.

Peter and Karen Barber
1000 hours into the project


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