had the cockpit voice recording. then when they found part of the plane was detached from the plane itself, i mean, we knew right away, because pieces of the plane are just not ever supposed to fall off. >> once terrorism is eliminated as the cause, investigators focus on why the tail broke off. it takes more than two years before the ntsb findings are released. according to the report, the cause of the crash is the separation of the tail or vertical stabilizer due to the first officer's excessive use of the rudder pedal. >> the entire vertical fin, which is the vertical stabilizer as well as the rudder separated from the fuselage and the airplane at that time became no longer controllable. ailerons, panels located on the wing, that are used to control the plane. the co-pilot does this but he