It seems incredible to me that where there has been an obvious fault in an aircraft type whole fleets have been grounded until the problem is fixed or checked. Here we have a heavy, sophisticated aircraft that crashes for no expiclable reason and it just keeps on flying until, perhaps, it happens again! Can you imagine what must go through the mind of every 777 aircrew on finals? Surely the aviation authorities can do better than this or do we have the dreaded economic considerations outweighing the value of human lives?