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these airplanes are in during manufacture at boeing, even though the tube is actually made by a vendor, when it gets to boeing, boeing is using that particular door for bringing in interior parts and that kind of thing during the assembly process. once that's done, it has to be, of course, reconnected. and then it has to be sealed. the bolts have to be in place and it has to be signed off. the question is, why are these bolts coming loose? and there's a number of reasons for it, i'm sure. >> what would those reasons be? >> well, when you look at it, depending on the type of bolt and nut assembly they're using, that airplane, the tube itself is constantly blowing up and shrinking with pressurization cycles. of course, then you have the twisting moment of that fuselage tube from aerodynamic loads. like anything else, a nut and a bolt will loosen itself. the question is, why aren't