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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.
“Roll”17 pages
## CONFIDENTIAL
We did have S-band pitch and yaw angles immediately following the yaw maneuver, and those that were acquired at about 3000 feet. After the yaw, the S-band appeared to have a little bit better communications. It was just about at the yaw-around maneuver (trajectory monitoring from the DSKY up to that point agreed very closely especially in H-dot and $ V_{I} $ with the values we had on the charts). It was almost immediately after yaw around that the altitude light went out, indicating that we had our landing radar acquisition and lockon.
## ARMSTRONG
The delta altitude was — 2600 or 2700, I believe, is the number that I remember. I think it was plus 2600 or 2700. The yaw around was slow. We had inadvertently left the rate switch in 5 rather than 25, and I was yawing at only a couple of degrees per second as opposed to the 5 to 7 that we had planned. The computer would not hold this rate of say, 1 to 2 deg/sec. It was jumping up to 3 degrees and back, actually changing the sign and stopping the roll rate. It was then that I clearly realized that we weren't rolling as fast as was necessary and I noted that we were on the wrong scale switch. So I went to 25 and put in a 5-deg/sec command and it went right around. However, this delayed it somewhat and
## CONFIDENTIAL Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 251 pages are in the text index: search them above, or from the library's search.