This question for me raises the same issue that pertains to these newer super duper de-icing systems avialable to allow helicopters to perform rescues flying through icing conditions to get to the scene, what if its offshore, you have flown through known icing to ge there, but before you begin your return your system goes unserviceable? Kinda screwed a bit, are you not? I could not help thinking some of the technology can in such instances lead us into quite dangerous situations we would not have persisted in getting into without them leading us to believe we could equally safely be guaranteed a safe return?