Apollo 7's Service Propulsion System engine, with 20,000 pounds of thrust, fired eight times without a hitch during the mission.
Notes on verification
Multiple independent sources (NASA, Astronautix, This Day in Aviation, Honeysuckle Creek) confirm eight successful SPS engine firings during Apollo 7. Minor discrepancy in thrust figure (20,000 vs 20,500 lbs) is a rounding variance, not a substantive contradiction. [tier=gold indep_score=0.838 clusters=4 claim_tier=notable]
Sources
- The Flight (and Fights) of Apollo 7 - Smithsonian Magazine (seed:science_and_space)
- https://www.honeysucklecreek.net/msfn_missions/Apollo_7_mission/hl_apollo7.html (corroboration)
- https://www.nasa.gov/history/50-years-ago-apollo-7-ends-101-successful (corroboration)
- https://www.nasa.gov/missions/apollo/apollo-7/apollo-7-launched-as-race-to-moon-reached-final-stretch/ (corroboration)
- http://www.astronautix.com/a/apollo7.html (corroboration)
- https://www.thisdayinaviation.com/tag/apollo-7/ (corroboration)