ADAHR Problem?

[resojames]

On the last few flights my attitude indicator goes up to very high angle of attack (up to 45 deg), the skid ball goes from left to right rapidly way outside of the cage and the heading goes off by 90 or more degrees. This is while in level flight. This will go on for 30 seconds or so and then settle down. I have dual ADAHRs one of which was repaired less than 20 hours ago by Dynon and the other bought new at the same time as a back up. The last occurrence I got a " ADAHR Cross Check Error (S) Turn Coordinator"

When this happens, a compare screen occurs that allows you to disable one of the ADAHR units. By the time I got the screen up, the AI had returned to normal so I couldn't tell if it was one ADAHR or the other. Does the Skyview primarily use #1 ADAHRS and check itself against #2? If so, can I disable #1 and fly on #2 to see if the problem is one of the ADAHrs or something affecting both and external to the ADHARS. Trying to figure a way to trouble shoot this

 

[swatson999]

There's a section in the installation manual on how to set up primary/backup ADAHRS units, fail-over, etc.

 

[resojames]

Thanks for the reply, I did find out how to look at the split screen output from each ADAHR while flying. I tried it yesterday but the problem didn't occur. I will continue to do this until the problem reappears and see if one of the units is the culprit. The Dynon folks thought that it could be pitot static problem or an engine vibration problem. The prop has been dynamically balanced What particular pitot/static problem could case problems with ADAHR?