Not only can they fly in cloud/in the dark, but also in iceing conditions, I have a $34,000 repair bill to prove this! One tip tank trashed, leading sdge dented, cowling destroyed and guts and crap all over the airframe along with front end damage on one engine, this when only doing 220 kts IAS , a flock of Canada Geese of course! At least seven strikes counted, might have been more but too much crap to really tell.