I just noticed today a tendency for my vacuum AI to vibrate a few
millimeters in its pitch axis occasionally, then the movement damps out.
The roll and pitch indication seem to be OK, and the vacuum DG is working
fine. The vacuum guage is at 5.0, right where it belongs. I'm wondering if
this is an early failure indication.

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Regards,
Mike

http://mywebpage.netscape.com/amountainaero/fspic1.html