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This still puts us well within our launch window. Now this recycling procedure will take an additional 35 to 40 minutes. The plan now is to recycle to the T minus 22-minute mark in the countdown. The next step that was to take place was the retraction of Swing Arm #1 and, at the time that was to take place, the Terminal Sequencer had not had an indication that the third stage LOX tank had been pressurized. As was mentioned earlier, during this sequence everything must happen at a certain time, before the next step in the sequence can take place. The crew (team) in the firing room, seeing this happen, pressurized the tank manually, but this did not happen fast enough to satisfy the automatic sequencer. The problem was with the Terminal Countdown Sequencer, which failed to give the command to…pressurize the third stage LOX tank. We’re at T minus 30 seconds and continuing our hold.
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Outside, Swing Arm #9, with its attached White Room, returned to its nearby, T-22 minutes ready position in case we were told to leave the spacecraft in a hurry.Ībout twenty minutes after Chauvin gave us his explanation for the hold, Launch Control announced over the public address system: Nothing I could do would help, and you never know when you many need the rest. Put me on my back with those soothing sounds, and I can sleep anywhere.
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It immediately told me that “we know what the problem is, we know how to fix it, and all we have to do is convince the bosses we can go ahead.” With this feeling of assurance, a light buzz in my ear phones, soft vibrations through my couch and suit back, and the hum of the of America’s fans and pumps, I went to sleep. To me, however, Skip’s voice carried the familiar tone of competence and confidence I had grown use to from him in vacuum chamber and Launch Pad tests. He, of course, as Commander, had control of the T-shaped hand controller at his left, a counter-clockwise twist of which could initiate a rapid sequence of events culminating in ignition of the launch escape rocket that would send us blazing off the top of the Saturn V. By the way, we’ve recycled to T minus 22 minutes and holding.”Ĭernan appeared to remain tense even after this explanation. We’ll work it out and get back to you shortly. It’s either a sensor or a computer problem.
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After about five minutes of extreme uncertainty mixed with not-so-reassuring reports on the communications loop saying, “We’re looking at the problem,” Test Conductor Skip Chauvin’s calm and calming voice entered our ears: “It looks like the Countdown Sequencer thought the LOX (liquid oxygen) tank for the S-IVB (Saturn third stage) wasn’t pressurized even though we had pressurized it with a manual override command. Meanwhile, working with Launch Control, we went through the process of putting America’s systems in a safe condition. This is Kennedy Launch Control.ĭid the Saturn V know that we were at “30 seconds and holding?” I felt a rush of adrenalin along with waves of disappointment, followed by anticipation of the violence of a possible launch-pad abort or rapid evacuation of the spacecraft. We’ll be standing by to check out the problem just as soon as we can get word. Safing of all systems, and the launch team here continuing through their emergency procedures. The astronaut crew aboard the spacecraft is going through their various safing now. The question bouncing around inside America at the time, however, was “Will management be convinced of any analysis or will we go into another month of training and quarantine.” No question existed in the spacecraft that we should go for launch! (See Mother’s diary, Appendix I for December 6c) “Nothing wrong on my gauges,” I told the others on the intercom after a quick scan.
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As the spacecraft’s clock counted down from 30 seconds through zero, we lay there without moving, three pair of eyes rapidly scanning the instrument panels for any clues to why the countdown had stopped at this critical point. We had no indications of a problem within the spacecraft and could only wait for information from the launch control center. This is Kennedy Launch Control…This is Apollo Saturn Launch Control. We’ll bring word to you just as soon as we get it. We are standing by at the T-minus 30 second mark. T-minus 30 seconds…we have a cutoff, we have a cutoff at T-minus 30 seconds. Ignition of the five F-1 engines of the Saturn V S-IC first stage of Apollo 17 at Pad 39A, Kennedy Space Center, Decem(NASA photo S72-55482).