443
NOUS72 KNES 281534
ADMNES
*UPDATE # 1 FINAL UPDATE: *

*GUAM 4:* PRIOR TO THE COMMUNICATIONS OUTAGE, THE ORIGINAL ANOMALY WAS
TRACED TO AN INTERMITTENT ISSUE WITH THE PENTEK CARD INSIDE THE SDR. THE
VENDOR REPLACED THE PENTEK CARD AND TESTED THE SDR AT THE TSI OFFICE TO
VERIFY THAT THE INTERMITTENT ISSUE HAD BEEN RESOLVED. GUAM 4 HAD BEEN
OPERATING PROPERLY FOR SEVERAL DAYS BEFORE THE COMMUNICATIONS OUTAGE WHILE
THE VENDOR COMPLETED FINAL SYSTEM CHECKS PRIOR TO RETURNING IT TO SERVICE.
AFTER COMMUNICATIONS WERE RESTORED, THE LUT VENDOR UPDATED THE ORBIT
VECTORS AND VERIFIED THAT THE SYSTEM WAS OPERATING NORMALLY.


*TOPIC: *SARSAT GUAM 4 LOW EARTH ORBIT (LEO) GROUND STATION OFFLINE


*DATE/TIME ISSUED: *JULY 28, 2026 1522Z


*PRODUCT(S) OR DATA IMPACTED:*  SARSAT ALERT DATA


*DATE/TIME OF INITIAL IMPACT:*  APRIL 02, 2026 2328Z


*DATE/TIME OF EXPECTED END: * JULY 28, 2026 1400Z


*LENGTH OF OUTAGE: * 116 DAYS, 14 HOURS, AND 32 MINUTES.


*DETAILS/SPECIFICS: *THE GUAM 4 LEO GROUND STATION IS NOT SENDING PASS
SOLUTION DATA DUE TO AN SDR ISSUE. 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



THIS NOTIFICATION WAS SENT TO ESPC.NOTIFICATION@NOAA.GOV MAILING LIST. IF
YOU WISH TO UNSUBSCRIBE OR SUBSCRIBE TO THIS LIST, PLEASE CONTACT ESPC
HELP-DESK AT ESPCOPERATIONS@NOAA.GOV WITH YOUR REQUEST. PLEASE NOTE: IT MAY
TAKE UP TO TWO BUSINESS DAYS TO PROCESS YOUR REQUEST. FOR ANY ADDITIONAL
INFORMATION YOU CAN REACH ESPC AT 301-817-3880 (24X7).

=