Artifact: Control Assembly, Reaction Jet and Engine On-Off (RJ/EC), Apollo Command Module, Block II

An Apollo Command Module Reaction Jet and Engine On-Off Control Assembly (RJ/EC) manufactured by Honeywell - part of the CSM Stabilization and Control System, responsible for translating Service Propulsion System (SPS) Main Engine and CM/SM Reaction Control System (RCS) firing commands originated from either the vehicle flight computer or manually from the astronaut (using the Translation Controller) to firing impulses. The RJ/EC accepted the firing commands and outputted 28 volt dc which opened the affiliated SPS/RCS solenoids on each of the engines, flowing propellant and thus firing the main engine and/or R-4Ds (Service Module)/SE-8's (Command Module) as applicable. In effect this box functioned as an electronic "gas pedal". The unit was installed in the Command Modules lower equipment bay (as indicated in the diagram accompanying this entry).