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Apollo Command Module Reaction Jet and Engine On-Off Controller (RJ/EC) manufactured by Honeywell, 23.25˝ x 5.75˝ x 6˝, with a Honeywell label on the side: "Reaction Jet and Engine On-Off Control, NAA/S & ID Control No. ME901-0706-0002, Mfr Serial No. 10028DAF1005, Mfr Part No. BG287G1, Contract No. M5J7XAZ4450012A, Mfr Date 30 Aug. 1966." The main label is flanked by two Honeywell "Modification Identification" plates, dated April 1967 and May 1968. Six connectors on the top are labeled "J1" through "J6."
Part of the Apollo Command Module Stabilization and Control System, the RJ/EC includes solenoid drivers and logic circuits to translate spacecraft computer or manually initiated commands into firing of the Reaction Control System (RCS) attitude control thrusters and the Service Propulsion System main engine. The RCS firings were important to the CM as they allowed adjustment to attitude without affecting the critical accuracy of orbital, trans-lunar, and trans-earth trajectories.
