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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 ## 6.0 TRANSLUNAR COAST ## 6.1 IMU REALIGNMENT We realigned the IMU in Earth parking orbit. The next time we realigned it, we were, I guess, inertially fixed. I remember now that our X-torquing angle was 0.172 degrees the first time, which seems excessive to me. We asked the ground to verify and they said it seemed excessive to them and to go ahead and redo it. So I went through P52 a second time. Instead of a minus 0.172 I got a minus 0.171. The results were repeated; therefore, the ground said go ahead and torque them, and we did. I don't understand why that torquing angle was that large. I guess it was an uncompensated X-drift, which they later compensated for more accurately, because the platform was well within its limits during the remainder of the flight. Yet this does seem like a large torquing angle. Another general comment about the IMU was I couldn't get consistent star angle difference numbers. At various times in the flight, I got either 5 balls 0.01 or 0.02, and there was no correlation. As a matter of fact, there was negative correlation. The more time I took and the more precise I attempted to be, the more often I got 0.01. ## CONFIDENTIAL
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