Directly from the Personal Collection of Apollo 11 Lunar Module Pilot Buzz Aldrin

DATA CARD WITH CRITICAL INFORMATION ON ROCKET SYSTEMꦫS PRIOR TO AND DURING ENDGINE USAGE LEEDED TO SAFELY LAND ON💦 AND RE-ASCEND FROM THE LUNAR SURFACE

BUZZ ALDRIN'S provenance letter reads, in part: "This Apollo 11 "RCS APS DPS" data card told me and Neil what the temperature and pressure should be in each rocket system prior to and during engine usage. "RCS" = Reaction Control System, or the quad cluster engines that surrounded the ascent stage. The RCS was used for maneuvering the Lunar Module (LM) as well as for minor course changes during undocking, rendezvous, and docking. "APS" = Ascent Propulsion System, or the main engine in the ascent stage of the LM used for liftoff from the lunar surface. "DPS" = Descent Propulsion System, or the main engine in the descent stage that fired to slow the LM down out of lunar orbit and get us onto the lunar surface. The descent stage stayed on the lunar surface and was used as the launch platform for the ascent stage of liftoff after our moonwalk was completed."

REFERENCES:

NASA. Apollo 11 Stowage List. Mission AS 506 CM 107/LM-5. Houston, Texas: Manned Spacecraft Center, July 15, 1969, pp. 51 & 74 (as part of the Data Card Kit, LM XFR)

CONDITION REPORT:

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