Denti said "The 737 is certified for flaps 30 or 40 autoland, F40 only if using both engines, F30 if doing an OEI autoland."
That only applies if you are lucky enough to be flying one of the 737NGs with the Fail-active,Cat3B capable autoland (i.e. "roll-out capable") MOST 737NGs only have the more limiting 2ch autoland system with no rudder channel and are not certified for single engine autolands. To the best of my knowledge the 737 (Classic and then NG) is the only airliner with only dual autopilot autoland ! All the other Boeings and all AB's have triplicated systems. Boeing themselves are very vague about what they actual did to the system to permit Cat3b landings! (As far as I am aware most JAA authorities have not permitted this(cat3b) upgrade to be used although they do allow the OEI autoland when needed.
Any further information on this subject will be avidly read!