RS-25 Engine No. 10001 Undergoes 500-Second Hot Fire Test
- Developmental RS-25 engine No. 10001 underwent a 500-second hot fire test at NASA's Stennis Space Center on Oct. 21, 2026.
- The engine has not flown, but the RS-25 design is described as proven flightworthy.
- NASA's SLS rocket uses four RS-25 engines during launch, and an Artemis mission vehicle specification lists four engines.
- The test collected data to improve engine performance and reliability.
- L3Harris Technologies is the prime contractor for the RS-25 engine.
What happened
RS-25 engine No. 10001 underwent a hot fire test. The associated date is 2026-10-21. The test took place at NASA's Stennis Space Center near Bay St. Louis, Mississippi.
What we know
The date associated with the engine is 2026-10-21.
The hot fire test result lists 500 seconds and 111 percent.
The engine was tested at NASA's Stennis Space Center, which is near Bay St. Louis, Mississippi.
No. 10001 is a developmental engine and has not been used in flight, while the RS-25 engine type is described as proven flightworthy.
NASA's SLS rocket is launched by four RS-25 engines, and the engines fire during launch. A vehicle specification for an Artemis mission lists four engines.
L3Harris Technologies is the prime engine contractor.
The test collected important data for improving engine performance and reliability.
Why it matters
The RS-25 engines are tied to NASA's SLS rocket, which is launched by four of them. The test collected data for improving engine performance and reliability, and the engine type is described as proven flightworthy.
Sources
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