GFC700 autopilot disengaged and Roll warning appeared on the PFD

[Yariv]

Not a dull moment:-). This was earlier today on an IFR flight from Paine field (KPAE) to Weed (O46), California. I flew the rest of the flight by hand. This was good practice. I did not see any circuit breakers pop out. One thing I did to try troubleshooting it was to recycle the AP Power switch. That did not help as the the system went through its checks and ended up displaying the Roll in red on the upper left side of the PFD. There were two other messages on the PFD before it displayed the last warning (Roll) - AFCS, and PFT.

Is this a servo problem or not enough info to determine?

Thank you,

Yariv

[GeeBee]

Likely servo, if it were AHARS you would have a red X over your AI.

 

[Yariv]

It was the roll servo. It was removed by PCA in Aurora Oregon and sent to Garmin for an overhaul. It came back 2 weeks later with 1 year warranty. It is working perfectly. Initially I was told that it would most likely be an exchange but then they told me that this part is not manufactured anymore, that it's too old and therefore an overhaul was the only way. Access to the roll servo was from inside the cockpit - they removed the panels from the central pedestal that is between the pilot and copilot. The total bill was ~$1800.

Hope this is helpful to others in the future.