Hugmonster, from her book "Flying Blind, Flying Safe" here's what the lady has to say about the ATR.
"Certain models were notorious for becoming suddenly difficult to control in extremely cold temperatures. Pilots have complained about problems with de-icing the plane's wings. The de-icing boot - a rubber sleeve on the wings that is designed to expand and crack accumulated ice - is not long enough to cover the entire length of the wing. Improvements (making the boot longer) have been required. Presumably, that fixed the problem. Personally, I am going to give ATR operators ample time to test their repairs. Think of ATR as fair weather flying."
Not overly accurate, I think.