In a test on Aug. 5, the propulsion system for Orion's service module fired continuously for 12 minutes, which simulated engine activity during an abort-to-orbit scenario. In this possible scenario, which would take place if Orion's interim cryogenic propulsion stage (ICPS) didn't correctly put the craft on a path to the moon, the service module would separate early from the ICPS and fire its boosters to get to a temporary orbit.
This would allow ground control to re-evaluate with the crew and craft and plan an alternate route to the moon. Even if Orion has to switch to an alternate mission plan, it may still be able to accomplish some of the goals of the mission.
During this successful test, engineers fired Orion's main engine and all eight of the module's auxiliary engines at the same time. Throughout this continuous firing, Orion's reaction control thrusters were periodically fired to simulate attitude control and the capacity of the craft's propulsion system.
The test allowed NASA's Orion engineers to evaluate the propulsion system and subsystems along with engine performance as the multiple engines fires simultaneously. This test comes after Orion's crew capsule successfully completed a launch-abort test on July 2.
The Orion service module is the powerhouse of the spacecraft, giving the craft the ability to move around in space and providing power and support to life support systems.
"This was our most demanding test for the pressurization system, including our propellant tanks, valves and other components,"Josh Freeh, deputy manager of the Orion Service Module at NASA's Glenn Research Center, said in a NASA statement.
"Inserting Orion into lunar orbit and returning the crew on a trajectory back home to Earth requires extreme precision in both plotting the course and firing the engines to execute that plan … With each testing campaign we conduct like this one, we’re getting closer to accomplishing our missions to the Moon and beyond," Mark Kirasich, program manager for Orion at NASA’s Johnson Space Center, said in the statement.
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