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Re: Europa-List: Re: altimeter encoder problem

Subject: Re: Europa-List: Re: altimeter encoder problem
From: David Joyce <davidjoyce@doctors.org.uk>
Date: Mon, 22 Apr 2013 16:26:10

Remi, Many thanks. Helpful as always! David

  "Remi Guerner" <air.guerner@orange.fr> wrote:
><air.guerner@orange.fr>
> 
> Hi David,
> I propose to share with you my personal experience on 
>that subject :
> My aircraft was originally fitted with a Garmin GTX320 
>and a Terra AT3000 encoder. After a few years flying, I 
>started to experience altitude reporting problems. ATC 
>was occasionally seeing me at 6000 ft or below ground 
>level while I was flying  at 2000 ft AMSL. I was once 
>wrongly accused of having busted the class A London TMA 
>while I was flying well below the max allowed altitude. 
>Then I reworked the wiring without success, then I had 
>the encoder tested by an avionic shop and it was found to 
>be ok. Then I borowed another GTX 320 from a frend for a 
>few flights and the system was working ok. So the culprit 
>was clearly the transponder which was intermittently 
>reporting an altitude different from the one transmitted 
>by the encoder.
> I have since installed a mode S GTX328, keeping the 
>Terra encoder and it has been working fine for the last 
>five years.
> Conclusion : in most of the cases the culprit is the 
>altitude encoder but it could also be the transponder 
>itself.
> I hope that helps.
> Regards
> Remi
>F-PGKL
> 
> 
> 
> 
> Read this topic online here:
> 
> http://forums.matronics.com/viewtopic.php?p=399096#399096
> 
> 
> 
> 
> 
> 
> 
>Un/Subscription,
>Forums!
>Admin.
> 
> 
> 



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