Well, I can tell you that helis are not free from ice worry. I know
Apaches have heaters in their blades allowing them to de-ice. Sadly,
they can not use them because it causes problems with blade
delamination. Which really means the cure is worse than ice. Hehe.
Go figure. For $24Mil per Longbow, surely you didn't really expect an
all weather bird!

Long story short, if they fly in icing weather, I imagine are they have
some form of heating in their blades.