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External impact may have caused this plane to go down whachlt are you learning? >> reporter: yeah. well, it's very difficult, isn't it? because he was using deliberately vague terminology to sort of explain that he didn't believe it was a maintenance issue or a pilot error issue. in other words not a company issue. that could have been responsible for death of these 224 people. trying to shift the emphasis to this theory that it was something external that caused the catastrophe being marked not just here in st. petersburg but all across russia as well. but the trouble is is that those vague s...

Everyone's checklist, it's the first thing you're taught in flight school, do a walk-around, look at the plane, looking for obvious leaks, exactly situations like this, hydraulic fluid or fuel. you want to do that before you get in the plane and turn anything on. and presumably they did that here and did not see any kind of leaks. there are some exceptions when you don't have to do a walk-around. presumably they did that. when they started the engines, one can assume that something came loose, which is going to lead the ntsb to look for a maintenance problem. they'll be looking at the maintena...

Weather was bad off indonesia's coast. but was it bad enough to play a role in flight 8501's disappearance? cnn's tom foreman has that. >> reporter: don, investigators have to consider the possibility that weather brought this plane down. because it went through such a huge band of terrible storms out there. and here are the three key questions viewers keep asking us. first, could lightning have done this? the answer is not likely. modern aircraft are designed so they can be hit by lightning, the lightning travels along the metal skin and then is ejected off the wing tips or off the tail. very...

Terrorist bomb downed it over scotland. and then you have twa's flight 800 doomed by a fuel tank explosion. also was cobbled together at this hangar here in new york. so, if flight 370 does turn up, might we see another kind of reconstruction? for that, let's go to bill savage, former pilot and certified crash investigator. i know that you participated in several of these kinds of investigation, piecing planes back together. what's the value of doing that? >> the value is 100%, because by putting airplane back together, we can then look at the specific areas that each investigator has an exper...

Pilots particularly 50-year-old zaharie ahmad shah who owned a flight simulator at his house and had ties to malaysian radicalism. >> good morning. >> what do you think happened? >> well, in the beginning i thought if we have to look at the evidence that we actually have,ç that's the activity of the airplane, the way it climbed up over 45,000 feet and then went down radically. that doesn't sound like an airplane problem. i can't imagine what kind of an airplane, maintenance problem, mechanical problem that could be. in the beginning i thought it was a struggle of some kind to take over the a...