to be. they are not going to fly until they are inspected. >> why do you think that happened? >> i think that aviation, like almost every modern endeavor is a complex system, and we rely as individuals on probably tens of thousands of other people every day, not knowing who they are, what function they have performed, but that we depend upon. and aviation is a perfect example of that. so when these airplanes were designed, they met certain standards. one of the task of the national transportation safety board is to do a forensics analysis of this particular aircraft, of this particular part, from its inception on the drawing board, the computer and design screen to its fabrication, manufacture, installation on the aircraft