Accelerometers/ Gyro installed crooked?

[N178EZ]

I know this is probably a silly question that everyone asks.

Is it possible that the gyro/ accelerometers are installed crooked in my early model D10A. I've finagled with is significantly over the years and it still requires significant roll bias and yaw bias (yaw) to make the skid ball and horizon center. I've trimmed the airplane in yaw to zero and skid and checked with a yaw string. The skid ball doesn't match by a full ball. The roll is obviously harder to measure in flight, but level on the ground and what appears to be level in flight also disagrees with the D10A. I expect the airplane to be crooked to an extent, but not 10deg in each axis. Thoughts?
Matt

 

[Dynon]

Everything that leaves the factory is fully-calibrated to within tiny fractions of a degree, so the answer to your precise quesion - whether or not they were "installed crooked" - is no.

However, it is possible - though pretty rare - for the sensors inside the EFIS-D10A to not match their original factory calibration over long periods of time. We don't have a formal specification here: our EFISes are designed to work for many years without needing any service or attention. But it sounds like we may need to see yours here. Give our tech support team a call at 425-402-0433 when you get a chance. Pictures of what you're seeing on the ground would really help too. Those can be emailed to support at dynonavionics dot com.