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NASA test teams fired developmental RS-25 engine No. 10001 for 500 seconds on Oct. 21, 2026, at Stennis Space Center. The test evaluated flight components and a new nozzle thermal protection system for future Artemis missions; this engine will not fly.
NASA test teams fired developmental RS-25 engine No. 10001 for 500 seconds on Oct. 21 at the agency’s Stennis Space Center in Mississippi, testing flight components and a new nozzle thermal protection system for future Artemis missions. The engine reached the 111% power level used by new-production RS-25 engines for Space Launch System launches, NASA said, but the developmental engine itself will not be used in flight.
The hot-fire test took place on the Fred Haise Test Stand at Stennis, near Bay St. Louis. NASA reported that operators ran the engine for almost eight-and-a-half minutes, or 500 seconds—the same duration RS-25 engines fire during an SLS launch. The test duration and power level allowed teams to examine engine behavior under operating conditions associated with launch.
NASA said the test had two main objectives: acceptance testing of RS-25 flight components intended for future Artemis missions, and validation of a new thermal protection system for the engine nozzle. That system is designed to protect the nozzle from the thermal environment around the SLS during launch. NASA and its prime contractor, L3Harris Technologies, collected data during the firing to support work on engine performance and reliability.
The test was carried out by operators from NASA, L3Harris and Nova Space Solutions. NASA described engine No. 10001 as a developmental unit and said it will not fly. Its role in the program is to provide test data; the report does not say that this single firing certifies the new protection system or any individual engine component for flight.
Testing Hardware for Artemis Launches
The RS-25 engines are a central part of the SLS launch system, which carries the Orion spacecraft on Artemis missions. NASA says four RS-25 engines produce up to 2 million pounds of combined thrust to help propel SLS at launch. Testing components and protective systems on the ground gives NASA and its contractor an opportunity to examine performance before equipment is assigned to a flight vehicle.
The 500-second run and operation at 111% power are relevant because NASA says they match the firing duration and thrust level required of new-production engines during launch. The test therefore addresses conditions tied to the engines’ intended use, including the heat around the nozzle. NASA said data from the developmental engine can help improve performance and reliability, though it did not provide measurements or a specific expected improvement.
For Artemis, the practical point is that flight hardware undergoes testing before use. NASA says all RS-25 engines are tested and proven flightworthy at Stennis before they are used. The latest test is one element of that ground-based work, not a launch event or a change to an announced mission schedule.
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How the RS-25 Fits SLS
The RS-25 is the engine used in the core stage of NASA’s Space Launch System. Each Artemis launch uses four engines, according to NASA’s account. The agency’s Oct. 21 report places the latest firing within the ongoing preparation and testing of RS-25 hardware for future missions, rather than describing a new engine design or a completed flight qualification.
NASA Stennis Space Center, in Mississippi, conducts RS-25 testing before engines are assigned to flight use. The Oct. 21 firing used a developmental engine on the Fred Haise Test Stand. NASA said the test team included agency staff and personnel from L3Harris and Nova Space Solutions. The report does not identify the specific Artemis missions associated with the components tested or provide a timetable for their delivery.
thermal protection system for rocket engines
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Flight Readiness Details Not Released
NASA’s report does not provide detailed test results, such as measured performance, inspection findings, or whether the new nozzle thermal protection system met all validation criteria. It also does not specify which flight components were acceptance-tested, which future Artemis missions they are intended to support, or when those components may be assigned to flight hardware.
The agency said the test can provide data to improve performance and reliability, but did not quantify any gains or state that the test alone establishes flight readiness. The developmental engine is not slated to fly. Further information about the findings and their effect on component qualification was not included in the report.
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Reviewing Data Before Flight Use
NASA and L3Harris can use the data collected during the firing to assess the engine’s operation and the nozzle protection system, in line with the test’s stated goals. NASA says RS-25 engines undergo testing at Stennis before flight use. The agency has not announced a date for another test, a public release of detailed results, or a schedule for approving the components evaluated on Oct. 21.
The next relevant developments would be NASA or its contractors reporting test findings, further validation work, or the assignment of qualified components to specific future Artemis missions. Until those details are released, the confirmed outcome is the completion of the 500-second hot fire and the test objectives NASA identified.
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Key Questions
What did NASA test on Oct. 21, 2026?
NASA fired developmental RS-25 engine No. 10001 for 500 seconds at the Fred Haise Test Stand at Stennis Space Center. The test evaluated flight components and a new nozzle thermal protection system for future Artemis missions.
Will engine No. 10001 be used on an Artemis launch?
No. NASA said the engine is a developmental test engine and will not be used in flight. Its purpose is to provide data for NASA and L3Harris Technologies.
What does 111% power mean in this test?
NASA said operators fired the engine up to the 111% power level, matching the thrust needed for new-production RS-25 engines to launch SLS and Orion to orbit. The report did not provide additional performance measurements.
What is the thermal protection system for?
The new system is designed to protect the RS-25 nozzle from the thermal environment surrounding SLS during launch. NASA said validation of this system was one of the test’s main objectives.
Did NASA announce when the tested components will fly?
No. NASA said the test included acceptance testing of flight components for future Artemis missions, but did not identify the missions or give a schedule for their use.
Source: primary
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