This question already has an answer here:
Suppose that during the boost phase a Falcon 9 lost enough engines that it could not deploy its payload into a useful orbit or trajectory.
Are there some scenarios where it could conceivably return to Earth with it's presumably very expensive or valuable payload intact, rather than deploy into a useless orbit or put it in the ocean?
For the purposes of this question assume that there is both a downrange landing ship in the ocean and the pad on land is also available and ready. Also assume there is clearance from government agencies, the insurers, customer(s) etc, and that it's really worth it to bring this particular payload back rather than scrap it and build another.
One abstracted, hypothetical example might be that the payload is "the last RTG on Earth" because there's no current replacement supply for any feasible radioisotope source.
Also assume that the rocket has sufficient programming to recalculate this dramatically different trajectory.
If everyone is "on board" with this, is it possible? Are there any show-stoppers for the current Falcon-9? Below about 110 km the fairing should still be intact, but would that even be necessary?