Not that it really matters but on the 330 if you lose an engine it only effects one hyd sys. The green system has two engine driven pumps so remains pressurised and the a/c stays in normal law and can do a cat 3A. Your talking about the 320 and even then you don't get a double system failure as the ptu keeps at least two systems running and therefore in normal law. Can also auto land but I think it's CAT 2, haven't flown it in ages.