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Date: Thu, 29 May 2014 13:13:09 -0400
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From: John Cooper <snopercod@comporium.net>
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Subject: [LML] Re: Hydraulic Cylinder Rigging
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Scott--

I can tell you right now that there's no way in hell that I'm going to 
relocate the mounting block for the aft end of the MLG cylinders.  I've 
already incorporated the SB on beefing up the OC link attach point so 
I'm just going to take my chances with a little pressure on the OC link 
since the factory says that's OK (I posed the manual section earlier). I 
agree with you that it would be "better" to have a down stop, but the 
235 manual says "not required".  If you have a 320 manual section or a 
SB that contradicts that, I'd sure like to see it. I've read both 
manuals and couldn't find any words requiring a down stop. So if I can't 
get a down stop adjusted, I'm just not going to worry about it.

I've got the Ong's Debongers, not the donuts. Also, I've already cut off 
~1/4" of the threaded end of the cylinders because I couldn't get them 
short enough - the rod end was bottoming out internally.

Best--

   --John

> John,
> If the actuator is too long fro the down stop either relocate the aft 
> end mounting or cut off some of the threaded end (within reason).  The 
> uo stop can be positioned with some more nuts on the shaft or cut it 
> down a bit if too long.
> Again, if 500 to 800 psi is pressure applied to the over center link 
> (main gear), that pressure is translated as a pre-load to the point 
> where the link is mounted on the spar.  Additional load from a bad 
> landing can cause delamination of that mounting block (especially true 
> if you are using the hard donuts for suspension, high tire pressure, 
> etc.).
> Good luck.
> Scott
> PS There is a service bulletin that describes a reinforcement phenolic 
> plate added between the top of the mounting block and the upper spar 
> cap.  See if you can get it from Lancair.


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    Scott--<br>
    <br>
    I can tell you right now that there's no way in hell that I'm going
    to relocate the mounting block for the aft end of the MLG
    cylinders.&nbsp; I've already incorporated the SB on beefing up the OC
    link attach point so I'm just going to take my chances with a little
    pressure on the OC link since the factory says that's OK (I posed
    the manual section earlier). I agree with you that it would be
    "better" to have a down stop, but the 235 manual says "not
    required".&nbsp; If you have a 320 manual section or a SB that
    contradicts that, I'd sure like to see it. I've read both manuals
    and couldn't find any words requiring a down stop. So if I can't get
    a down stop adjusted, I'm just not going to worry about it.<br>
    <br>
    I've got the Ong's Debongers, not the donuts. Also, I've already cut
    off ~1/4" of the threaded end of the cylinders because I couldn't
    get them short enough - the rod end was bottoming out internally.<br>
    <br>
    Best--<br>
    <br>
    &nbsp; --John<br>
    <br>
    <blockquote type="cite"><big><font id="role_document" size="2"
          face="Arial" color="#000000">
          <div><big>John,</big></div>
          <big>
          </big>
          <div><big>&nbsp;</big></div>
          <big>
          </big>
          <div><big>If the actuator is too long fro the down stop either
              relocate the aft end mounting or cut off some of the
              threaded end (within reason).&nbsp; The uo stop can be
              positioned with some more nuts on the shaft or cut it down
              a bit if too long.</big></div>
          <big>
          </big>
          <div><big>&nbsp;</big></div>
          <big>
          </big>
          <div><big>Again, if 500 to 800 psi is pressure applied&nbsp;to the
              over center link (main gear), that pressure is translated
              as a pre-load to the point where the link is mounted on
              the spar.&nbsp; Additional load from a bad landing can cause
              delamination of that mounting block (especially true if
              you are using the hard donuts for suspension, high tire
              pressure, etc.).</big></div>
          <big>
          </big>
          <div><big>&nbsp;</big></div>
          <big>
          </big>
          <div><big>Good luck.</big></div>
          <big>
          </big>
          <div><big>&nbsp;</big></div>
          <big>
          </big>
          <div><big>Scott</big></div>
          <big>
          </big>
          <div><big>&nbsp;</big></div>
          <big>
          </big>
          <div><big>PS There is a service bulletin that describes a
              reinforcement phenolic plate added between the top of the
              mounting block and the upper spar cap.&nbsp; See if you can get
              it from Lancair.</big></div>
        </font></big></blockquote>
    <br>
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