The containment requirement and testing requirement were imposed after review of the history of uncontained engine failures which caused serious damage to aircraft , consequent to the July 19 , 1989 United Airlines Flight 232 accident . That accident did not originate from a fan blade off but from a defect in the fan rotor disk on the Number 2 ( tail ) General Electric CF6 engine , resulting in a loss of hydraulic power to the flight control actuators and crash landing of that aircraft
United Airlines Flight 232
United Airlines Flight 232
Blade off testing