Lots of multiengine airplanes can be flown on ferry flights
with one (in some cases more) engines inoperative. You will not see this done on revenue flights, obviously. The DC-10 and MD
-11 can be two-engine ferried, for example, as well. 747's, DC-8's, 707's, not sure about 727's...you get the drift.
Obviously it's subject to a different set of checks, balances, and regulations, but if all the t's are crossed and i's are dotted then it's perfectly legal.