Really, and how much experience has the judge of SH Ops? The BOI were only allowed to establish what happened not to establish fault, that was the job of the AM's. But what does this dealing in semantics achieve? We cannot escape the fact that the aircraft was put into a position in space and time that caused it to crash and if it sufferd a mechanical failure then that apparantly didn't prevent the thing being controlled at impact. The odds of a failure that forced flight at high speed into a rock, that happened to be shrouded in fog and which they shouldn't have been near are infinitesimal.