Apollo Command Module (Block II) Master Events Sequence Controller (MESC), measuring 13″ x 8.75″ x 13″ and weighing 35.86 lbs, bearing the original Autonetics parts tag, which reads: "Controller Sequencer, Master Events ‘A11A,’ NAA/S & ID Cont. No. ME901-0567-0023, Contr. No. NAS9-150, Pt. No. 65675-107-161, Mfg. Date Nov. 3 ‘69, Ser. No. 06359-6334BBA." The controller, which bears a total of eight ports, also features stenciled part numbers, “Controller - Sequence Master Events, Part No. 40870-306-51, 06359-6745-BBA,” “Name, Controller - Sequence Master Events A11A, Part No. 65675-107-161,” and “C18A2, V36-540040-3, 06359-6334BBA.” Inspection labels affixed below the main tag are headed, “Acceptance Thermal Testing Time” and “Acceptance Vibration Time.” In fine condition, with scattered scuffs and chips to white paint.
The MESC was a component of the spacecraft's Sequential Events Control System (SECS) subsystem, which regulated automatically sequenced functions during mission ascent, entry, flight, and in the event of an abort. The MESC governed activities including Launch Escape Tower jettison, Service Launch Adapter separation, Command Module/Service Module separation, and Earth Landing System deployment. It also directed Launch Escape System actuation and Service Propulsion System abort modes. As the Master Controller for the SECS, MECS interfaced with and commanded the following controllers: Emergency Detection System, SM Jettison Controller, Lunar Module Separation Sequence Controller, Command Module Reaction Control System Controller, Earth Landing Sequence Controller, and Translation Controller. A desirable, mission-critical piece of hardware.
From The Peter Gerry Collection.
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