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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.
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# CONFIDENTIAL ## 10.0 LUNAR SURFACE ## ARMSTRONG The postplanning checklist went as planned, and venting was initiated in the OX tank almost immediately even before the point on the timeline called for it. We ran the OX pressure down to the 40- to 50-psi range and opened the fuel vent and vented it down the same amount. We then closed it off after which time Houston became concerned with tank pressures and asked us to reopen it again, although at the time we were reading relatively low tank pressures. I think the OX built up slightly over 50 at the time, but they were apparently reading a higher value, and I assume perhaps that they had an error in their signal from that tank pressure. In any case, we opened both tanks after that and let them bleed down to about 15 psi, which was probably the stable condition of the vapor pressure in the tank at that point. ## ALDRIN After touchdown, we got a GO for T-1 and then we proceeded to enter P68 and recorded the latitude and longitude and altitude. We then proceeded out of that and reset the stopbutton and entered P12 for T-2. At this point, I think that a little shuffling in the data ## CONFIDENTIAL
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