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NOUS72 KNES 102049
ADMNES
TOPIC:  GOES-19 HYDRAZINE BIPROPELLANT THRUSTER (HBT) FLUSH SCHEDULED FOR
NOVEMBER 24, 2025 2246 UTC

DATE/TIME ISSUED: NOVEMBER 10, 2025 2040 UTC



PRODUCT(S) OR DATA IMPACTED: GOES-19 GLM, SUVI, EXIS, AND CCOR POTENTIAL
PRODUCT DEGRADATION.



DATE/TIME OF INITIAL IMPACT: NOVEMBER 24, 2025 2246 UTC



DATE/TIME OF EXPECTED END: NOVEMBER 24, 2025 2256 UTC



LENGTH OF DEGRADATION: 10 MINUTES



DETAILS/SPECIFICS:

HBTS ARE USED FOR LARGE SATELLITE MANEUVERS AND MUST BE FLUSHED
PERIODICALLY TO ASSURE NOMINAL PERFORMANCE. A GOES-19 HBT FLUSH WILL BE
PERFORMED ON NOVEMBER 24, 2025 AT 2246 UTC. DURING THIS MANEUVER, ALL
INSTRUMENTS WILL CONTINUE OPERATING. THE MANEUVER COULD CAUSE DEGRADATION
TO EXIS AND CCOR PRODUCTS, SUVI PRODUCTS` INR PERFORMANCE, AND HAS CAUSED
SEVERE GLM    THROTTLE-LIMITED   , FALSE EVENTS. PRODUCT NAVIGATION MAY BE
DEGRADED FOR UP TO 10 MINUTES AFTER THE CONCLUSION OF THE HBT FLUSH.


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