Flown Entry Monitor System (EMS) schematic carried into lunar orbit aboard the Command Module Odyssey during the Apollo 13 mission, 24 x 10.5, signed and flight-certified in black ballpoint, "Flown to the moon on board Apollo 13, Fred Haise, LMP" and "James Lovell, CDR Apollo 13." The schematic, with tab marked "SCS EMS," diagrams the connections and pathways relative to the EMS and the Stabilization and Control System (SCS). In very fine condition.
The SCS provides a capability for controlling rotation, translation, SPS thrust vector, and displays necessary for man in the loop control functions. The SCS is divided into three basic subsystems: attitude reference, attitude control, and thrust vector control. These subsystems contain the elements which provide selectable functions for display, automatic and manual attitude control, and thrust vector control. All control functions are a backup to the primary guidance navigation and control subsystem (PGNCS). The EMS provides Service Propulsion System enabling/disabling discretes to the SCS thrust on-off logic for the SPS.
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