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Date: Wed, 04 Nov 2009 17:37:11 -0500
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Subject: auto pilot oscillations
From: Abe Gaskins <abe@mgmindustries.com>
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To the Group:
I've been flying my legacy for about 2 years.  I wish I could say that I am
the builder, but I can't. I had a builder with a good reputation build the
plane and have been happy with his overall workmanship for the period time.


I thought I would share with you the root cause that was finally uncovered
which was causing a multitude of problems.  Cutting it short and sweet.  I
have had problems with the autopilot holding:

   - the altitude set point
   - tracking the glide slope on a Garmin 430W
   - tracking the glide slope on a Chelton.   (On some cases the plane would
   pitch straight down into the ground)

I have a TruTrak VSGV II with Autotrim.   In tracking down the problem every
wire was rung out, every TruTrak component was removed on different
occasions and sent back to TruTrak to inspect (all were checked out
individually and returned at no charge--as an aside TruTrak has always been
professional and helpful).

Finally I pulled everything out (the VSGV II unit, the autotrim unit and the
vertical servo unit) and sent it to TruTrak.  On this last go around, they
determined that the vertical servo was never set up correctly and was out of
calibration.  Apparently  there is a spring inside the gear box of the
vertical servo. If it is set up incorrectly then there will be oscillations.


Abe

Abe Gaskins
MGM Industries
Office 800-476-5584
Direct line 615-265-2046
Cell 615-642-2310

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To the Group:<div>I&#39;ve been flying my legacy for about 2 years. =A0I wi=
sh I could say that I am the builder, but I can&#39;t. I had a builder with=
 a good reputation build the plane and have been happy with his overall wor=
kmanship for the period time. =A0</div>
<div><br></div><div>I thought I would share with you the root cause that wa=
s finally uncovered which was causing a multitude of problems. =A0Cutting i=
t short and sweet. =A0I have had problems with the autopilot holding:</div>
<div><ul><li>the altitude set point</li><li>tracking the glide slope on a G=
armin 430W</li><li>tracking the glide slope on a Chelton. =A0 (On some case=
s the plane would pitch straight down into the ground)</li></ul><div>I have=
 a TruTrak VSGV II with Autotrim. =A0 In tracking down the problem every wi=
re was rung out, every TruTrak component was removed on different occasions=
 and sent back to TruTrak to inspect (all were checked out individually and=
 returned at no charge--as an aside TruTrak has always been professional an=
d helpful). =A0</div>
<div><br></div><div>Finally I pulled everything out (the VSGV II unit, the =
autotrim unit and the vertical servo unit) and sent it to TruTrak. =A0On th=
is last go around, they determined that the vertical servo was never set up=
 correctly and was out of calibration. =A0Apparently =A0there is a spring i=
nside the gear box of the vertical servo. If it is set up incorrectly then =
there will be oscillations.</div>
<div><br></div><div><br></div><div>Abe</div><div><br></div>Abe Gaskins<br>M=
GM Industries<br>Office 800-476-5584<br>Direct line 615-265-2046<br>Cell 61=
5-642-2310<br>
</div>

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