Dual plane separation sequence (2/35)
Time: 151.43 sec MET   35 sec
Separation of the S-IC stage
The F-1 engines of the S-IC have been cut-off. Thrust is tapering off rapidly.
The retro rockets of the S-IC stage and the ullage rockets of the interstage are burning.
The retro rockets are meant to push the S-IC away from the remaining Saturn V stack. The ullage rockets are primairily meant to settle down the propellants of the S-II stage into the propellant tanks.

Credit: NASA
Scanning credit to Spacecraft Films

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