Read an article a few months ago, cant remember source, but the issue was to do with de-iceing on rescue helicopters and their potential to fail at times. The article specifically flagged up the danger of flying through such conditions only for the system to fail, and then be effectively trapped on the wrong side of such weather trying to make good a return to safety but one that puts the aircraft now without any such operational system being forced into iceing conditions and the resulting dangers. Food for thought?