I cannot find any thread started at the time (almost exactly a year ago) of a serious incident involving an ATR 72, for which an
AAIB report has just been released. .
the Conclusion was;
The aircraft suffered an in-flight upset at FL130 after accruing airframe icing during the climb, resulting in the adverse aerodynamic effect of ice build-up on the wings. The crew were presented with a degraded perf caution but did not action the relevant checklist because they focused on climbing out of the icing conditions. The IAS was not maintained at or above red bug +10 kt and control of the aircraft was lost when a turn was initiated in the lnav mode of the flight director.
I think it's worth a read, not so much for the technical issues but for the Human Factors elements of why the crew did what they did.
If it's been done already in PPRuNe, apologies for not finding it, please delete...
PS I found
a mention in PPRuNe, but buried in Airlines, Airports & Routes