Testing the Limits

S8, E2: Before May 1991, no 767 aircraft had ever crashed. That all changed when Lauda Air Flight 004 mysteriously slammed into a jungle in Thailand less than 15 minutes after takeoff, killing all 223 people aboard. Was it mechanical failure, pilot error, or something worse than investigators imagined? See what led to an alarming discovery and how it changed the way 767s are built forever.