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May 12, 2016 at 9:15 comment added user @FutureHistorian Apollo 13 had multiple problems that directly affected the crew's survival chances, including loss of oxygen, water (both for drinking and equipment cooling), electricity (fuel cells) and the SPS engine (which was in unknown condition until SM jettison, at which point it would have done them no good even if it had been in usable condition). On any reasonable mission, the Earth-Mars part would be largely coasting, so you don't need the engine as such. As long as you only lost one of your engine stages (MCS but not MDS, say), it might not even be more than a nuisance.
Apr 10, 2016 at 15:34 comment added Future Historian In other words: it would not be a national tragedy but rather another Apollo 13?
Apr 10, 2016 at 10:39 history answered Hobbes CC BY-SA 3.0