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A/P Stec 55 trims down when flaps are set
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muelli
Posted 2015-10-26 8:36 AM (#1587)
Subject: A/P Stec 55 trims down when flaps are set


Regular

Posts: 66
2525
Location: Muenster EDDG, Germany
Hi,

I have a STEC 55 A/P in my Silver Eagle. When I set the flaps to 10 degrees (e.g. in level flight on an approach before intercepting the GS), the A/P trims the plane down so that I immediately lose about 600 ft. After a while the A/P tries to correct it and trims up so that I end about 100 ft below the preselected altitude.

Last year I was at O&N and they told me it might be the compensator which resides in the right wing root. They've tried to fix it and it was a bit better than before but not completely solved. Now I have the same problem as before.

Before I go to the avionics shop I'd like to ask whether somebody else had this problem too and how to solve it.

Thanks a lot!
Andreas

Edited by muelli 2015-10-26 8:37 AM
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Kurt
Posted 2015-10-26 12:40 PM (#1588 - in reply to #1587)
Subject: Re: A/P Stec 55 trims down when flaps are set


Regular

Posts: 88
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We had the same problem on our SE it was finally fixed by the avionic shop in changing some components in the STEC AP computer. As we fly in Germany we went to Avionik Straubing. They are very competent and FAA approved. Also in our case it was not the compensator, we checked this before.
Kurt
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muelli
Posted 2015-10-26 12:46 PM (#1589 - in reply to #1588)
Subject: Re: A/P Stec 55 trims down when flaps are set


Regular

Posts: 66
2525
Location: Muenster EDDG, Germany
Hi Kurt,

thanks, yeah I know about Avionic Straubing and Mr. Streifl. ;-)

Could you please give me the registration of your plane so that I can pass that on for them to check what they have done so that they can repeat this at my A/P?

Thanks,
Andreas
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Kurt
Posted 2015-10-26 12:53 PM (#1590 - in reply to #1587)
Subject: Re: A/P Stec 55 trims down when flaps are set


Regular

Posts: 88
252525
It was either N6214P or N8KR
Good luck in Straubing
Kurt
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muelli
Posted 2015-11-05 9:05 AM (#1591 - in reply to #1590)
Subject: Re: A/P Stec 55 trims down when flaps are set


Regular

Posts: 66
2525
Location: Muenster EDDG, Germany
I was in Straubing and they've changed my A/P according to your settings. Works!

Thanks a lot, Kurt!
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