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Date: Tue, 28 Jun 2005 14:09:42 -0400
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Subject: Re: [LML] Re: 66 hours...and  few questions
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From: "John Schroeder" <jschroeder@perigee.net>
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> In a message dated 6/27/2005 11:37:39 P.M. Central Standard Time,
> sportform@cox.net writes:
>
> 1)   I have the Tru Trak A/P.  This is perhaps the biggest love/hate
> relationship I have.  In smooth air, it is a dream.  In  turbulence,
> even light chop, it is a nightmare as it correct for every  minor
> deviation and does it's best to make me sea sick...what's worse it
> won't hold altitude.  Does the AP possibly have an internal leak of
> some sort?  The altitude needs constant resetting, as  well....
>

I second Jeff's advice: call Jim Younkin. HOwever, in the installation  
manual of our Tru Trak DFC 250, there is a caution about letting the  
static input to the Tru Trak be shared with other devices requiring static  
pressure inputs. The real problem is if one of those devices or a  
combination of devices combine to provide a plenum effect (my  
terminology). This does not allow the A/P to respond correctly to the  
changes in static pressure. This is my summarization of that caution and  
it could be the sole or part of the cause of your problems. Check for  
leaks in the static system & pitot system. If there is a leak in the  
system, it would mor likely be there and not in the A/P itself.

Hope this helps.

John

PS: We ran a separate static source for the A/P. We believe that this A/P  
is so good that it can be an emergency ADI - something we intend to test  
when we get flying. Any comments on this from the group?