STENNIS SPACE CENTER, Miss., June 24, 2025 — NASA and L3Harris Technologies (NYSE: LHX) have successfully test-fired the first RS-25 rocket engine slated to help power the fifth launch of the Space Launch System or SLS rocket for the Artemis Moon exploration campaign. This is the first hot-fire test of a flight version of the new RS-25 engine. The first four Artemis missions use upgraded RS-25 engines from the space shuttle program.
“This successful acceptance test shows that we’ve been able to replicate the RS-25’s performance and reliability, while incorporating modern manufacturing techniques and upgraded components such as the main combustion chamber, nozzle and pogo accumulator assembly,” said Kristin Houston, President, Space Propulsion and Power Systems, Aerojet Rocketdyne, L3Harris. “Our propulsion technology is key to ensuring the United States leads in lunar exploration, creates a sustained presence on the Moon and does not cede this strategic frontier to other nations.”
The new L3Harris RS-25 engine throttled up to 111% during the 500-second acceptance test, demonstrating more thrust than what the space shuttle engines required.
NASA awarded L3Harris a contract in 2015 to restart RS-25 engine design and production for SLS, including leveraging modern manufacturing techniques such as 3D printing. The new production engines are 30% less expensive than the space shuttle main engines and will deliver the same reliability and efficiency.
About L3Harris Technologies
L3Harris Technologies is the Trusted Disruptor in the defense industry. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security. Visit L3Harris.com for more information.
Forward-Looking Statements
This press release contains forward-looking statements that reflect management's current expectations, assumptions and estimates of future performance and economic conditions. Such statements are made in reliance upon the safe harbor provisions of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. The company cautions investors that any forward-looking statements are subject to risks and uncertainties that may cause actual results and future trends to differ materially from those matters expressed in or implied by such forward-looking statements. L3Harris disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise.
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