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Apr 26, 2023 at 2:43 comment added Mark @Joshua, according to the Wikipedia article, it was the second ignition of the third stage (to perform the trans-lunar injection) that failed. The SPS engine was used to put the spacecraft into an orbit that would complete some but not all of the mission objectives.
Apr 26, 2023 at 1:42 comment added Joshua Missed Apollo 6. Third stage failed to ignite. SM engine was used to make orbit. It's kind of like another stage.
Apr 20, 2023 at 23:29 history answered Mark CC BY-SA 4.0