graphical format. >> black boxes contain hundreds of data points or pe ram ters about the flight's movements, pilot maneuvers, speed and altitude, allel displayed with a series of graphs. >> every flight data a in order for humans to understand that, we need to convert it into engineering units and it simply means feet for altitude and air speed is recorded in knots. >> this right here is air speed, correct? >> that's correct. >> reporter: here as you see getting faster, that represents takeoff. >> yes. >> reporter: through graphs like this if somebody deliberately nose dived the aircraft or a mechanical problem. >> there would be all kind of indications. which engine turned off first, because of fuel starvation, they would know that versus if it would have been intentionally