NASA says “GO” for final Green Run Test of SLS

Space Coast, FL – NASA says they are GO for the final Hot Fire test of the SLS Green Run Tests. But first, what is the Green Run test? To keep it simple, it’s an eight (8) part series of tests for NASA’s Space Launch System (SLS). The, Green, means that all rocket hardware is new and untested. The, Green Run, means it is a first full test of all the SLS core stage flight hardware. NASA is now proceeding with the 8th and final test.

Fully loading the propellant and detecting no leaks is a major milestone for the Green Run test series. | Photo: NASA

Getting to the Hot Fire Test

The seventh test of the SLS core stage Green Run test series happened on Dec. 20, 2020. This was the first time cryogenic, or super cold, liquid propellant was fully loaded and drained from the SLS core stage’s two tanks. The end of the test was automatically stopped a few minutes early due to timing on a valve closure.

After analysis of the data it was determined the valve’s predicted closure was off by a fraction of a second, and the hardware, software, and stage controller all performed properly to stop the test. The team has corrected the timing and is now ready to proceed with the final test of the Green Run series. The Hot Fire Test!

 Wet Dress Rehearsal

8th and Final Test of the Green Run

The upcoming hot fire test will fire all four of the stage’s RS-25 engines simultaneously for up to eight minutes. This will simulate the core stage’s performance during a launch. After the firing, the core stage will be refurbished and shipped to NASA’s Kennedy Space Center in Florida. The stage will then be assembled with the other parts of the rocket and NASA’s Orion spacecraft. This will all be in preparation for Artemis I. The first integrated flight of SLS and Orion and the first mission of the agency’s Artemis program.

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