hour? it s russian roulette. in the wake of the crash, the questions began immediately. how could this plane with its clean safety record suffer such a catastrophic failure in flight? right away there are some key clues. at the accident scene, a critical component called the fan disc is missing from the number two engine. it isn t found until three months later in a field 70 miles away in alta, iowa. that s where the plane experienced that initial violent jolt. these photos taken by a witness on the ground as united 232 was about to slam into the runway also provide investigators with critical information. you can see that there are holes in the horizontal stabilizer from the debris as