Engine failure and subsequent actions
No one should question the actions of the QF74 crew. Simply put, the engine suffered a severe failure (turbine blade shed) which caused a loss of thrust and engine vibration, internal and external damage and an obviously alarming, for the pax, discharge of sparks. The crew, rightly in my view, assessed the situation, advised ATC of a problem and proceeded to dump sufficient fuel to enable a landing below MLW and, after declaring a PAN, conducted an uneventful 3 engine approach and landing. Any discussion as to what they should or should not have done otherwise is pure speculation and serves no useful purpose. The operating crew were there, they had to make decisions based on available information and it seems to me that they did exactly what would be expected. Well done. PS. Inane comments like "Pretty lucky, dumping fuel with that source of ignition" serves only to highlight that some commenting on this forum have absolutely no system knowledge or understanding of what happens in the real world.