Update#2: After the LUT vendor replaced the Azimuth axis encoder and monitored pass data, Alaska 4 (AK4) LEO Ground Station returned to normal operations at 1950Z, November 17, 2020.

Update #1: The LUT vendor has replaced the axis encoder and it has been recommended to monitor the LUT for the next 12 to 24 hours.

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

Date/Time Issued: November 18, 2020 1755Z

Product(s) or Data Impacted: SARSAT alert data

Date/Time of Initial Impact: November 16, 2020 1702Z

Date/Time of Expected End: November 17, 2020 1950Z

Length of Outage: Approx 26 hrs. 48 min.

Details/Specifics of Change: Alaska 4 (AK4) LEO Ground Station located in Fairbanks, AK has stopped receiving pass solution data as of 1702Z. The LUT vendor has been contacted and is investigating this issue.

Impact: Minor 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

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