Originally posted by Diagnostic ...
I mentioned this a few weeks back, and sensor_validation kindly pointed out a very plausible potential cause (link below) unrelated to ice (I don't know if that's what you were suggesting?)
Well it could be related to ice, or it could be related to the EASA AD, and there is no way of proving it now. Though looking at the traces (when valid), it was tracking again prior to 2:12:20.
In any case, it wasn't an issue in ALT 2B as the SW used the highest AoA value.