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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 COLLINS Well, you can confirm them with the fuel cell flows, and that's not something that reaches out and grabs you. If you watched those meters carefully, you could definitely say that all four gimbal motors came on. ALDRIN I was looking at this sort of thing later. I found that observing them several times right at the time they were coming on, you look at the current and you see that it's a fairly small but observable change in the fuel cell current, and then just about a half second later you begin to see the rise and flow. You can catch both of them if you look at the current first and then the hydrogen and oxygen flow. COLLINS I just looked at hydrogen flow. They say that you have to be watching closely. If you are, you can definitely say that they all four came on. 3. 42 AUXILIARY PROPULSION SYSTEM ARMSTRONG That was particularly noted during powered flight. 3. 43 POGO OSCILLATIONS OF S-IVB ARMSTRONG No POGO oscillations. ALDRIN There's a rougher ride on the S-IVB than on the S-II. # CONFIDENTIAL
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