Update #1: This is a reminder of the GOES-19 Hydrazine Bipropellant Thruster (HBT) Flush activity scheduled to begin today at 2246 UTC

Topic:  GOES-19 Hydrazine Bipropellant Thruster (HBT) Flush Scheduled for November 24, 2025 2246 UTC 

Date/Time Issued: November 24, 2025 1541 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. 

Contact Information for Further Information: Please email User Services at spsd.userservices@noaa.gov

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