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accident activities alignment ALSEP antenna Apollo I3 Apollo I3 Review Apollo Program approximately ascent stage assembly astronauts attitude backup batteries burn camera checklist combustion command module CORTRlGHT crew cryogenic descent detanking Director docking Earth electrical engine entry equipment feet Fred fuel cell gimbal gimbal lock HAlSE heater Houston I3 Review Board ignition impact jettison Kennedy Space Center launch vehicle ln addition LOVELL lunar module lunar orbit lunar surface maneuver midcourse correction minutes Mission Control Mission Control Center Module Pilot Moon MSFN NASA operations oxygen tank Panel performed PGNS photographed PLSS pounds pressure problem procedures recovery S-ll S-lVB sample seismometer sensor service module simulator SLAYTON solar wind Space Flight space vehicle Spacecraft Center SWlGERT Teflon telemetry temperature tests thermal thermostatic switches trajectory transearth translunar valve venting wiring