As a 747 Captain I can say yes. It cant maintain altitude however, youll drift down continuously until you reach a runway (hopefully). Even with only one engine inop you are likely going to drift down to an altitude that the aircraft can fly based on the current gross weight.
Does UPS have driftdown charts in the QRH or do they have supplemental charts for that printed separately?
A few years ago I took a flight on an Emirates A380 and had the very best seat in Cattle Class...right next to the stairway that leads to the cockpit.While in my seat a man who was obviously the pilot walks in.He had an Aussie accent so I said to him...jokingly (so he wouldn't think I was a hijacker)..."hey,Captain,any chance of me taking the wheel of this thing for a while?" He laughed and said "no,there's a two week course you have to complete first".
I'll never forget it! LOL!