Remi, Today I have taken off my panel and traced all the
wiring to find a faulty connection on the A2 wire coming
out of my EFIS. Now works perfectly up to 10,000ft tested.
thanks for your help. 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
>
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