Topic:  GOES-West Hydrazine Bipropellant Thruster (HBT) Flush Scheduled for September 25, 2026 0300 UTC

Date/Time Issued: September 10, 2026 1310 UTC

Product(s) or Data Impacted: GOES-West GLM, SUVI, and EXIS potential product degradation.

Date/Time of Initial Impact:  September 25, 2026 0300 UTC

Date/Time of Expected End:  September 25, 2026 0310 UTC

Length of Degradation: 10 minutes

Details/Specifics:

Hydrazine Bipropellant Thruster (HBT) are used for large satellite maneuvers and must be flushed periodically to assure nominal performance. A GOES-West HBT Flush will be performed on September 25, 2026 0300 UTC. During this maneuver, all instruments will continue operating. The maneuver could cause degradation to EXIS 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. 

Web Site(s) for applicable information: N/A

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

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