Topic:  GOES-18 Hydrazine Bipropellant Thruster (HBT) Flush Scheduled for June 5, 2025 0306 UTC 

Date/Time Issued: May 19, 2025 1627 UTC UTC

Product(s) or Data Impacted: GOES-18 EXIS, SUVI, and GLM potential product degradation.

Date/Time of Initial Impact: June 5, 2025, 0306 UTC

Date/Time of Expected End: June 5, 2025, 0316 UTC

Length of Outage: 10 minutes

Details/Specifics of Change:

HBTs are used for large satellite maneuvers and must be flushed periodically to assure nominal performance. A GOES-18 HBT Flush will be performed on June 5, 2025 at 0306 UTC. During this maneuver, like the previous HBT flush, 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. 

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

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