NOTICE ADVISORY TO NAVSTAR USERS (NANU) #052-91052
SUBJ: PRN13 UNUSABLE ON DAY 52 0600-0605 UTC
1. CONDITION ON DAY 52 (21 FEB 91):
A. PRN13 (MCS: SVN9) WAS UNUSABLE ON DAY 52 BEGINNING 0600 UTC UNTIL
DAY 52 AT 0605 UTC.
B. PRN9 (MCS: SVN6) USABLE OVER WESTERN NORTH AMERICA (WNA) AND
PERSIAN GULF AREA (PGA). L-BAND-ON SEVEN DAY FORECAST:
DAY DATE      L-BAND-ON WNA   L-BAND-ON PGA
52  21 FEB 91 52/0438-52/0638 52/1653-52/1908
53  22 FEB 91 53/0434-53/0634 53/1649-53/1904
54  23 FEB 91 54/0432-54/0632 54/1645-54/1900
55  24 FEB 91 55/0428-55/0628 55/1641-55/1856
56  25 FEB 91 56/0424-56/0624 56/1637-56/1852
57  26 FEB 91 57/0420-57/0620 57/1633-57/1848
58  27 FEB 91 58/0416-58/0616 58/1629-58/1844
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.