Imperfect Pitch

S5, E8: It's supposed to be a simple in-flight test for one of the world's most popular passenger planes, but something has gone terribly wrong. During one maneuver the XL Airways Germany Airbus A320 suddenly pitches up, loses lift, then crashes into the sea, killing all aboard. What happened? Did the pilots push the commercial airliner too far, or did the plane's automated computer systems somehow cause the deadly spiral? Follow investigators as they search for the wreckage and for the reasons why this high-tech aircraft failed so spectacularly.