Update #1 (Final Update): Alaska 4 is consistently sending solution data. The intermittent azimuth antenna issue is related to severely low weather temperature conditions.

Topic:  SARSAT Alaska 4 Low Earth Orbit (LEO) Ground Station Offline

Date/Time Issued:  December 23, 2021 1745Z

Product(s) or Data Impacted:  SARSAT alert data

Date/Time of Initial Impact:      December 13, 2021 0851Z

Date/Time of Expected End:  December 23, 2021 0012Z

Length of Outage:  9 days, 15 hours and 21 minutes

Details/Specifics of Change:  The Alaska 4 (AK4) LEO Ground Station located in Fairbanks, AK  has missed two consecutive passes. The maintenance vendor has reported an intermittent azimuth antenna issue.

Impact: Minor-Dual satellite tracking capability lost. Distress alert detection/reporting may be delayed.

Contact Information for Further Information: USMCC Operations usmcc@noaa.gov at  301-817-4576

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