>> look at his nose up in the air. oh, my god. it's an accident. >> reporter: investigators still aren't saying whether they believe pilot error led to the crash, but deborah hersman made it clear their decisions are being closely reviewed. >> we're looking for things that might affect human performance like fatigue, like illnesses or medication. >> reporter: the pilot at the controls had only limited experience on a boeing 777, just 43 hours, though many hours flying 747s. but he never landed a triple-7 in san francisco for him. this was considered a training flight for him. the crew called for an increase in speed. at four seconds, the pilots were getting a stall warning. and a second and a half before the crash, the pilots tried to abort the landing. as this animation showed, the plane clipped the sea wall,