dozens more were injured. a federal hearing will begin tomorrow to review the report, and tom foreman has more. >> oh, my god. >> reporter: two key questions concerning the asiana air crash. as the jet approached, why did the pilots fail to notice as the plane's speed plummeted dangerously low. it killed three people and injured almost 200 more. >> i thought, you know, that was it. i thought i'm dying. >> reporter: aviation analysts say the crash is a warning. computerized ought make has clearly improved safety in decades, but relying on it too much is a real danger. >> ought make definitely helps in most circumstances. but you have to treat it as help