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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.
“Gray”3 pages
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## CONFIDENTIAL ALDRIN (CONT'D) It makes troubleshooting far easier and it minimizes the number of problems you can get into. ARMSTRONG It's just a basic difference in philosophy. Most of our Directorate takes the viewpoint that you leave everything on, and essentially everything is hot all the time. We took just the opposite approach; namely, we turned all the things off that we didn't think were contributing, particularly in the control system. We isolated that many more possible failures causing us difficulties enroute. COLLINS We did the very same thing in the command module in that we used hand controller number 1 as a spare. We never powered it up and left it alone. ARMSTRONG A lot of people didn't understand about disabling this and disabling this switch. It was really just a matter of preventing failures from getting to us in critical times. ## CONFIDENTIAL
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