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NASA tested developmental RS-25 engine No. 10001 at Stennis Space Center on Oct. 21, firing it for 500 seconds and up to 111% power. The test evaluated flight components and a new nozzle thermal protection system for future Artemis missions; this engine will not fly.
NASA fired developmental RS-25 engine No. 10001 for 500 seconds on Oct. 21 at Stennis Space Center in Mississippi, testing flight components and a new nozzle thermal protection system intended to support future Artemis missions. The engine reached 111% power, but NASA said this developmental unit will not be used in flight.
The test took place on the Fred Haise Test Stand at NASA’s Stennis Space Center near Bay St. Louis. The nearly eight-and-a-half-minute firing matched the duration RS-25 engines operate during an SLS launch, according to NASA. Operators also ran the engine at the 111% power level specified for new-production engines used to launch the Space Launch System rocket and Orion spacecraft toward orbit.
NASA described the primary objectives as acceptance testing RS-25 flight components for future Artemis missions and validating a new thermal protection system. The system is designed to shield the engine nozzle from the thermal environment around SLS during launch. NASA and its prime contractor, L3Harris Technologies, used the developmental engine to collect data intended to inform engine performance and reliability.
The test was conducted by operators from NASA, L3Harris and Nova Space Solutions. NASA says four RS-25 engines produce up to 2 million pounds of combined thrust to help propel SLS on each Artemis mission. Engines intended for flight are tested at Stennis before use; the engine fired in this test is a developmental unit, not one of those flight engines.
Testing Hardware for Artemis Launches
The firing gives NASA and its contractors a ground-test opportunity to evaluate engine components and the new nozzle protection system before relying on them in a crewed lunar program. The 500-second run and operation up to 111% power reproduce key aspects of the engine’s launch role, allowing teams to collect data under demanding test conditions.
The test does not itself demonstrate that a future mission is ready to launch, nor does NASA’s report give a schedule change for Artemis. Its relevance is more specific: engine performance and thermal protection are part of preparing and qualifying hardware for future SLS flights. The engine will not fly, so the test’s value lies in the data and component evaluation rather than adding a new engine to the flight inventory.
RS-25 engines are a central part of SLS propulsion. NASA says four engines together provide up to 2 million pounds of thrust for an Artemis launch. Findings from ground tests can inform work on flight components, though the agency has not released detailed results from this particular firing.
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The RS-25 Role in SLS
The RS-25 is used by NASA’s Space Launch System, the rocket that carries the Orion spacecraft for Artemis missions. During launch, four engines operate for about the same 500 seconds as the test duration NASA reported. The agency says the combined thrust from the four engines can reach 2 million pounds.
NASA’s Oct. 21 report places the latest firing within a broader test and production process: new RS-25 engines are tested before flight, and the work at Stennis involves NASA and contractor teams. This specific test centered on developmental engine No. 10001, flight components and a new thermal protection system for the nozzle. NASA did not identify a specific Artemis mission assignment for the components tested.
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Test Results and Flight Use
NASA’s report does not provide detailed measurements, identify any issues observed during the firing, or say whether the thermal protection system passed a formal qualification milestone. It says the test was intended to validate the system and capture data, but does not publish the results or explain what further analysis is required.
The agency also does not specify which future Artemis missions will use the flight components covered by the acceptance testing, or whether the test affects any mission schedule. The developmental engine itself will not fly; how the collected data will influence production engines or flight hardware remains to be detailed.
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Further Analysis at Stennis
NASA and L3Harris can analyze data gathered during the hot-fire test to assess engine performance, component behavior and the nozzle thermal protection system. NASA has not announced a date for a follow-up test or released a schedule for publishing the results.
Flight-bound RS-25 engines will continue through NASA Stennis testing and must be assessed before use, according to the agency. The next public milestone for this particular development will depend on NASA or its contractors sharing test findings, further qualification steps, or information about how the evaluated components will support future Artemis missions.
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Key Questions
What did NASA test?
NASA fired developmental RS-25 engine No. 10001 at Stennis Space Center on Oct. 21, 2026. The test evaluated flight components and a new nozzle thermal protection system.
How long did the test last?
The engine fired for 500 seconds, or almost eight-and-a-half minutes. NASA said that matches the time RS-25 engines operate during an SLS launch.
Will the tested engine fly on an Artemis mission?
No. NASA said the developmental engine will not be used in flight. The test was conducted to collect data and evaluate components and the thermal protection system.
What does the new thermal protection system do?
NASA said it is designed to protect the RS-25 engine nozzle from the thermal environment surrounding the SLS rocket during launch. The agency has not published detailed results from this test.
Did NASA announce a change to an Artemis schedule?
No schedule change was included in NASA’s report. The agency described the firing as a test supporting future missions but did not name a mission assignment or provide a launch-date update.
Source: primary
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