Reaction Control System
The forward and aft RCS systems consist of helium storage tanks, pressure
systems, propellant systems, and thermal control.
Gaseous helium supplies pressure to the fuel and oxidizer tanks.
A system of tanks, lines and valves distributes propellant to the
RCS Quantity Monitor
Onboard computers calculate the usable percent of fuel and oxidizer
in each RCS module.
Engine Propellant Feed
Isolation valves control the amount of propellant being fed to each
Each RCS engine contains a fuel and oxidizer valve, injector head
assembly, combustion chamber, nozzle and electrical junction box.
Heaters maintain propellant and pod temperatures within safe operating
RCS Jet Selection
Based on crew commands, the onboard computers direct RCS burns.