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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.
# CONFIDENTIAL ## 9.2.9 Radar tracking ARMSTRONG We had a good manual radar acquisition, and data from the radar agreed well with the VHF ranging information. ALDRIN Again, we had P20 in the background, but we didn't use it. This was a manual lockon. ARMSTRONG The radar was depowered to cool during the DOI to PDI phase. 9. 2.16 Adequacy of procedures necessary to accomplish DPS maneuver ARMSTRONG The platform drift check, a P52, was done against the Sun. This procedure seemed to work as we had planned; however, the variation in the data was somewhat larger that I would've guessed. Do you have those numbers? ALDRIN Yes. The technique that we used was to compare what the computer thought the little gimbal or the inner angle was and to point the rear detent at the Sun. We'd compare that with what the actual middle gimbal was. Now we did this in PGNS pulse. The way that we found to work out best was for Neil to tell me when, in the background, we'd have the AUTO maneuver display 50 18 in P52. We'd call up on top of that VERB 6 NOUN 20 or 22. And I'd have NOUN 20 up. As # CONFIDENTIAL
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