i would imagine it would be that of the maintence workers responsibility to notice such things, as that would fall under 'maintenence'... tho, i recently heard about a worker (either baggage handler or maintence worker) who hit the plane with some small vheicle (if it was a baggage handler it was that little cart they drive around, if it was maintence worker it was something else) not even that hard... and didn't tell anyone. later on that plane took flight and came down, and i think (not sure) pretty much everyone on it died...