Russia’s Interstate Aviation Committee (IAC) has blamed deicing procedures for a UTair ATR 72-200 crash in Tyumen in April 2012 that killed 33 people. According to an IAC statement, deicing procedures were rejected before the flight. The committee concluded there were snow and ice sediments on the aircraft surface, which led to a deterioration of aerodynamic characteristics.
For information can be found here in an article published at Air Transport World.
