All four RS engines -25 is the structure mated to the main stage for NASA's The Space Launch System (SLS) rocket for Artemis I, the first mission of SLS and NASA's Orion spacecraft.
To complete the rocket stage assembly, engineers and technicians are now integrating propulsion and electrical systems. within the structure. The completed core stage with all four RS-25 engines attached was the largest rocket phase ever built by NASA since the Saturn V stage for the Apollo Program that first sent Americans on the Moon.
The stage, which includes two large propellant tanks, provided more than 2 million pounds of thrust to send Artemis I to the Moon. Engineers and technicians at the Michoud Assembly Facility in New Orleans installed the fourth RS-25 engine on the rocket stage on November 6, 2019, just a day after the structure shut down the third engine. The first two engines of the RS-25 were mated to the stage in October.
After the meeting is complete, the crew will conduct an integrated functional test of the flight computer, avionics and electrical system operating throughout the 212-foot-tall core stage in preparation for its completion next year. This test is the first time that all avionics flight systems will be tested to ensure that the systems communicate with each other and perform well to control the flight of the rocket. The integration of the RS-25 engines into the massive core phase is a collaborative, multistep process for NASA and its partners Boeing, the leading stage contractor, and Aerojet Rocketdyne, the RS-25 engines leading contractor.