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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
Read from the scan by GLM-OCR; expect the odd misread word.
## CONFIDENTIAL going to do on LOI day and I also went over the complete switch checklist. In essence, we got ourselves 1 day ahead. On LOI day, I went over the circuit breakers but did not go through the complete switch list again. That gave us a little more time to go through the rather brief COMM procedures that we had. I might mention here that the systems test meter in the command module showed that the LM power position was always within limits. It did oscillate rather rapidly between about 0.3 or 0.4 and about 2.2 volts; generally around 1.2. The on and off cycling of the LM loads was much more rapid than I had anticipated. Every few seconds, the voltage level of the LM bus would change significantly. ## 7.31 POWER TRANSFER TO LM I have logged the times of transfer to LM power, 83 hours even, and transfer back to CSM power, 83:38. The intervening time was spent checking out the COMM. All of this was done on low voltage tap. We checked the OPS pressures both on the first and second days and they were well up there - 5750 and 5800. The REPRESS valve certainly does make a loud bang when you move it to CLOSE. There doesn't seem to be any way to avoid that, especially when you go to CLOSE; it seems you are relieving some pressure. ## CONFIDENTIAL
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