SpaceTentative

RS-25 Engine Test

expected October 2026

expected October 2026

—hype

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    Schedule updated. Previously Wednesday, 14 October 2026.

    About this moment

    RS-25 Engine Test is expected October 2026. The exact day has not been announced yet.

    NASA is conducting a hot fire of an RS-25 engine as part of certification testing for future SLS (Space Launch System) rockets. The test of developmental RS-25 engine No. 10001 is planned to run for almost eight-and-a-half minutes (500 seconds) and throttle up to 111% of its rated power level. This static fire at Fred Haise Test Stand, NASA’s Stennis Space Center is expected in October 2026; no exact date has been set.

    This listing uses an approximate period. An exact day has not been confirmed.

    Where
    WorldwideFred Haise Test Stand, NASA’s Stennis Space Center

    Date source

    Launch Library 2

    Source last checked Oct 18, 2026

    Sources and attributions

    This is a public listing. If the date or details look wrong, tell us.

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