For once CASA acted in a timely and responsible manner. One of their certificated designs suffers an in-flight break up on the other side of the world. It's not weather related; there's no immediate evidence to suggest sabotage, so what could it be? Initial investigation by a competent agency says wing came off. Further investigation would appear to have cleared it of a design fault, so CASA promptly un-ground the fleet.
A five day grounding would only bankrupt an operator already teetering on bankruptcy.
Imagine the fall-out if CASA did not ground the type and another one crashed in similar circumstances meantime. The FAA know all about that.