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This is Volume 1 of NASA's Apollo 11 Technical Crew Debriefing, dated July 31, 1969. The Mission Operations Branch of the Flight Crew Support Division at the Manned Spacecraft Center in Houston prepared it, and it was originally classified Confidential. In it Armstrong, Aldrin and Collins go phase by phase through suiting, launch, powered flight, Earth orbit and lunar surface activities. They comment on suit fit, vibration, checklists, lunar dust, footing and poor sleeping conditions in the lunar module. A section titled Visual Sightings appears in the table of contents.
“Low Earth orbit”2 pages
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# CONFIDENTIAL 7. 8 ADEQUACY OF CONTACT WITH GROUND OPERATIONAL SUPPORT FACILITIES FOR LOI ALDRIN Before the burn, I had noticed a difference in the A and B N2's. I didn't record which one was higher. They were well within what we consider nominal; it stuck in my mind that there was a difference. It wasn't too surprising when the ground called us after the burn and said that they had observed tank B nitrogen had dropped down somewhat during the time of the burn. I think it dropped to 1900. ARMSTRONG The values I have are B — 1950 psi and A — 2250 psi postburn. The helium was 1500 psi. Those came up a little bit after the temperature stabilized. ALDRIN We'll talk a little more about that. Evidently there was not any particular leak. It might have been a thermal condition that one tank had been exposed to. ARMSTRONG The flow through that particular solenoid valve could have been greater than emphasized. ALDRIN We started that one on B and then went to A. I don't know if that would be any explanation. ARMSTRONG I can't think offhand why that would affect it. The only thing I think about is the size of the orifice through which the gas is passing or the chamber size that, somehow, it was feeding... # CONFIDENTIAL
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