NOTICE ADVISORY TO NAVSTAR USERS (NANU) #063-91065
SUBJ: TERMINATE OPERATIONS FOR PRN9 DAY 65 AT 0342 UTC
1. FORECASTS/ADVISORIES AS OF DAY 64 (05 MAR 91):
A. PRN9 (MCS: SVN6) TERMINATED NAVIGATION/POSITIONING OPERATIONS
ON DAY 65 (06 MAR 91) AT 0342 UTC. PRN9 IS NOT USABLE AND WILL NOT
RESUME SERVICE.
B. PRN17 (MCS: SVN17) WILL BE REPOSITIONED ON DAY 72 (13 MAR 91):
PRN17 IS EXPECTED TO BE UNUSABLE BEGINNING 0900 UTC FOR UP TO 24
HOURS. PAGE 17 OF SUBFRAME 4 OF ALL SATELLITES WILL CONTAIN A
SPECIAL MESSAGE DESCRIBING THIS EVENT. THIS MESSAGE WILL READ:
310HDD9010000000000000 AND SHOULD BE INTERPRETED AS MONTH 3 (MAR)
MESSAGE 1 (FIRST MSG) PREVIOUS MESSAGE 0 (NONE) SVID H (PRN17)
STATUS D (UNUSABLE) DAY D (13) HOUR 9 (0900 UTC) MINUTE 0 (00)
DURATION DAY 1 (1 DAY) HOUR 0 (0) MINUTES (0). THE REMAINDER OF THE
MESSAGE IS BLANK OR ZEROS.
C. PRN12 (MCS: SVN10) WAS UNUSABLE ON DAY 65 BEGINNING 1535 UTC.
AT THIS TIME, THE SATELLITE HAS NOT RETURNED TO SERICE. USE
PRN12 BROADCASTS FOR REAL-TIME STATUS. NANU 064-91066 WILL CONFIRM
START/END TIMES OF THIS OUTAGE.
2. RECOMMENDATION: CONFIRM AVAILABILITY OF SATELLITES PRIOR TO USE.
3. POINT OF CONTACT: MAJ WILLIAM FAUVER AT COMMERCIAL (719)550-6379
OR AUTOVON 560-6379.