Contained vs uncontained turbine failures relate to the damage from the blades being contained, which in this case they were. Contained failures still result i

Contained vs uncontained turbine failures relate to the damage from the blades being contained, which in this case they were. Contained failures still result in engine parts exiting the engine, but not through the engine case, which is reinforced to contain the turbine blades in a failure. The unexpected issue here is that the cowling was knocked off, which is not supposed to happen, but in recent years it seems to be happening.