Topic:  GOES-19 Hydrazine Bipropellant Thruster (HBT) Flush Scheduled for July 21, 2026 2307 UTC

Date/Time Issued: July 10, 2026 1610 UTC

Product(s) or Data Impacted: GOES-19 GLM, SUVI, and EXIS potential product degradation.

Date/Time of Initial Impact: July 21, 2026 2307 UTC

Date/Time of Expected End: July 21, 2026 2307 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 July 21, 2026 2307 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: NA

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

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