Update #1 Final Update: The issue during LEO passes was caused by the system using incorrect negative coordinates to track the LEO satellite. The LUT vendor ingested the USMCC schedule for LEO and restarted the ACU, restoring proper functionality.

Topic: SARSAT Alaska 3 Low Earth Orbit (LEO) Ground Station Offline

Date/Time Issued: March 21, 2025 1634Z

Product(s) or Data Impacted: SARSAT alert data

Date/Time of Initial Impact: March 19, 2025 1915Z

Date/Time of Expected End: March 21, 2025 1556Z

Length of Outage: 1 Day, 20 hours, and 31 minutes.

Details/Specifics of Change: The Alaska 3 LEO Ground Station is not sending pass solution data. The LUT vendor is investigating. .

Impact: Minor-Dual satellite tracking capability lost. Distress alert detection/reporting timeliness affected.

Contact Information for Further Information: USMCC Operations usmcc@noaa.gov at

301-817-4576

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

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