I'm mostly flying GA.  On long flights in MSFS 2024 (say over 30 minutes) using autopilot the aircraft can suddenly roll violently to the left.  If I don't immediately correct it the wings end up vertical and the aircraft goes out of control.  This happens with both the default Cessna 172 and the Carenado 182RG, the two aircraft I use for these trips.  It is way more frequent in NAV mode but also occurs in Heading mode.

It appears this is a bug that goes back to MSFS2020.  

https://forums.flightsimulator.com/t/msfs-autopilot-causes-the-aircraft-to-go-into-a-left-roll/592652/5

There are some who have reported it only happens after making adjustments, but I have it happening without touching the aircraft at all.  

Has anyone else had this problem and any suggestions on how to overcome it?   

I am running on a PC, using a Fulcrum yoke, Winwings pedals and Logitech throttle and panels.

Thanks!

Yes, I have had this happen, and no, I do not know the cause, although I suspect runaway trim..

@Malcolm Street Here is a possibility but not a real diagnosis. When flying the C414AW (FSW) in 2020, I had exactly the same problem. After a long period of diagnostic work (including many dead ends), here is what I think was happening. My controller (a joystick) had a small but constant bit of spiking which persisted through each flight. The aircraft’s autopilot would react by cranking a bit of trim to counteract each of the spikes. After a while, those counter-actions cumulated and led to the autopilot switching off. And left the aircraft in an awful maximum trim in one direction or the other. The plane would spiral into the earth below.

The “solution” was to build in a larger “null zone” into the simulator controller settings which blocked the small spikes from getting to the autopilot. Now this exact problem is unlikely to be directly relevant given your high quality controllers. But my particular experience may suggest a way to approach your problem.

Hope this helps.
Mike

On 5/6/2025 at 11:43 PM, MM said:

The “solution” was to build in a larger “null zone” into the simulator controller settings

Or, if I may be so bold, buy a new controller. One with Hall effect doohickies.

Trust you are well. 😁

On 5/6/2025 at 12:56 PM, Malcolm Street said:

I am running on a PC, using a Fulcrum yoke, Winwings pedals and Logitech throttle and panels.

Didn't read that bit. (Practice what you preach Attwood) Full Hall effect doohickiness so spikes shouldn't be the cause.

I'll get me coat...

I haven't had this happen since updating to SU2, so I assume it was a bug that's been squashed.

Large NULL Zones are my cure for most of my controller issues...

I don't want to spend more money in controllers, and when & if these break before me, I'll use the keyboard instead 🙂