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[i]STAFFORD: The S-IVB lit off exactly to the second on time. It started its pitchdown 5 degrees. We were all getting very sensitive to any motion. The thing we noticed right away was the growling of the S-IVB and these oscillations. There were little lateral and longitudinal oscillations and a growl. Then between 3 minutes and 3 minutes and 5 seconds, a high-frequency oscillation noise and vibration were superimposed upon the growling. All three of us thought the flight was going to be over right then.
YOUNG: It was a zzzzzzzzzzzzzzzzzzzzzzz - like that. Maybe 60 cycles or somewhere around there. It's hard to say.
STAFFORD: And you could feel the vibration in the couches.
YOUNG: Feel it and hear it. So we all figured the flight was over right there. So, from 3 minutes on, we held our breath.
CERNAN: It provoked comment like, "burn, baby, burn." You can't call it pogo.
YOUNG: You know, the couple of nights we had Ed James and those guys in for dinner, and they'd briefed us that the math model showed you to expect a pogo in the last 15 seconds of the S-IVB flight.
STAFFORD: But we never had a longitudinal pogo. There was no longitudinal pogo. What we had were these motions.
CERNAN: It was a random buzz.
YOUNG: This might have been a high-frequency pogo for all we know.
STAFFORD: But it just came on like that, and it lasted all the way through until shutdown. We'd never seen it before and never heard about it. It really scared the hell out of us - not from a safety point of view - we thought the flight was going to be over shortly.
CERNAN: And I was trying to figure out how we'd do a TLI - plus 10 abort.
STAFFORD: But the guidance was just beautiful, and it shut off within a foot per second. It was just fantastic. The S-IVB maneuver to separation attitude was on time right to the degree. It was as solid as a rock. Preseparation configuration was satisfactory; MCC GO for pyro arm was good. Again, T&D attitude was good. Okay.[/i] [/B][/QUOTE]
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