Nuts and Bolts

S12, E1: Emery Worldwide Flight 17 leaves Sacramento Mather Airport in February 2000 while carrying a load of freight containers. Upon takeoff, the aircraft dives repeatedly and banks to the left. The pilots attempt to regain control of the crippled plane and return to the airport, but the DC-8 crashes a mile from the runway, killing all three crewmembers. Investigators suspect the cargo was loaded improperly, until a much more troubling cause is discovered upon closer examination.