FLOWN Apollo 13 LM Systems Data Book Page A schematic coveri

Sale 2073 - Lot 175

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FLOWN Apollo 13 LM Systems Data Book Page. A schematic covering the LM Ascent Engine Signal Flow. Features the crew interface switches including "START", "ABORT," and "ABORT STAGE" with their corresponding electrical lines. Approximately 36x10 inches, pre-folded to 8x10 inches. NASA/MSC, 1969

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This LM schematic, labeled "24 APS SIG" for 24 volt Ascent Propulsion System Signal, was a critical reference tool during the flight. Many of the LM systems were powered down to save electrical power. The crew was able to monitor flight systems with this and other schematics. If the LM Descent Engine failed, the Ascent Engine was the only remaining large rocket engine to give the crew any chance to return home to earth.