CNN CNN Newsroom With Carol Costello January 5, 2015 14:12:00
The -- not turned that on. we're looking at what might have contributed. later once we get black boxes we'll determine if it was indeed icing on the engines. >> was icing on the engines the cause of any other plane crash that you can remember? >> are there is one. i'm sorry, i can't recall it specifically now. there's one accident that was caused because of the icing. it was because the engine icing systems designed to prevent it weren't armed. >> okay so different circumstances perhaps. tim taylor david soucie chad meyers, thanks to all of you. still to come. a silent protest as thousands g...