HSI malfunction

[rddaos]

I've tried twice to fly from KJFK (new york) to KDTW (detroit).  Each time, towards the end of the trip, near one of the last waypoints, the autopilot goes bonkers and flies beside the waypoint, instead of right over it, and then the plane stays banked and flies in the wrong random direction instead of proceeding toward the next waypoint.  Also, the HSI goes haywire and freezes up.  The plane can bank, or climb, or dive and the HSI doesnt respond.  The horizon doesn't reflect the true orientation of the plane, the heading stays frozen and doesn't change as the plane changes heading.  Attached is a screenshot showing that even with the plane banked at 90 degrees (basically falling out of the sky), the HSI still indicates a nearly horizontal orientation.  Please advise.

[Cameron]

What happens if you fly another route?

[eaglewing7]

Random failure?

Icing?

From the look of things something has either failed, or your plane has iced over probes and that could cause the erratic readouts...

[rddaos]

I didn't realize that icing was modeled with the corvalis.  I'll try the same route with some pitot heat and see what happens.  I haven't really experienced the HSI going crazy with other routes.  I'm going to try a few experiements and see if I can replicate the malfunction and figure out exactly what is triggering it.  Will report back.

[Lukasz]

If it is icing, then it's good to note, that it's X-Plane's inherent feature. Checking the weather became much more important, since I've started flying in it