factors. how much fuel was on board and so forth. you can really recreate in a great level of detail what was happening with the plane and why it came down. we heard earlier there's speculation perhaps there was some kind of icing, maybe icing even in the engines. >> i think that -- yeah just to be clear on that that is what the weather service has said. that there may have been an icing problem. that is really preliminary reporting. we do not know if that's what brought this plane down. >> that's really speculative at this point. >> yeah. >> until we get -- this is going to be able to tell us if there was icing involved. >> right. david soucie to you, the most important information you'd be looking for as you're investigating this crash, without having this without having the black boxes from what has been recovered thus far? >> well the position of where they find the debris is extremely important because the fact that you can determine whether there was an in-flight breakup or a breakup -- the extent of the breakup once it hit the water. that's incredibly important, but