UPS never required detailed inspection of part that failed before engine flew off plane that crashed

UPS did not require detailed inspections of engine mount bearings in its MD-11 freighters, despite Boeing's earlier recommendations, leading to an engine separation during takeoff that caused a crash. The failure resulted in three pilot deaths, 12 fatalities on the ground, and multiple injuries. Boeing, UPS, the FAA, and a maintenance company all acknowledged misunderstandings about the risks of bearing failure.