NOTICE ADVISORY TO NAVSTAR USERS (NANU) #090-93103
SUBJ: PRN20 UNUSABLE AS OF 103/0847
1. CONDITION: PRN20 (SVN20) IS UNUSABLE BEGINNING ON DAY 103 (13 APR
93) BEGINNING 0847 UTC. PRN20 WAS SET BAD FOR SCHEDULED MAINTENANCE
ON DAY 103 AT 0233 UTC. PRN20 CAME BACK FROM THE MAINTENANCE ACTIVITY
AT 0847 UTC BUT THE NAVIGATION SIGNAL WAS QUESTIONABLE. THE SATELLITE
WAS THEN TAKEN OFF THE AIR AGAIN AT 1245 UTC. PRN20 WILL BE OUT
UNTIL FURTHER NOTICE.
2. USERS OF GPS ARE CAUTIONED THAT THE SYSTEM IS NOT YET FULLY
OPERATIONAL. SIGNAL AVAILABILITY AND ACCURACY ARE SUBJECT TO CHANGE
DUE TO AN INCOMPLETE CONSTELLATION AND OPERATIONAL TEST ACTIVITIES.
3. POC: CAPT HUTSELL AT COMMERCIAL (719) 550-6378 OR DSN 560-6378.