NOTICE ADVISORY TO NAVSTAR USERS (NANU) #020-91020
SUBJ: PRN6 UNUSABLE 19/2205-19/2235 & 20/0907-20/1112 UTC
1. CONDITION: PRN9 CONTINUES TO BE SET USABLE IN ALMANAC HEALTH
AND UNUSABLE IN EPHEMERIS HEALTH. PRN6 WAS UNUSABLE ON DAY 19
(19 JAN 91) BEGINNING 2205 UTC UNTIL DAY 19 AT 2235 UTC. PRN6 WAS ALSO
UNUSABLE (L-BAND DISABLED) ON DAY 20 (20 JAN 91) BEGINNING 0907 UTC
UNTIL DAY 20 1112 UTC. THE L-BAND OF PRN6 WILL BE DISABLED AS BELOW:
DAY DATE      UNUSABLE (UTC)  ACTUAL (UTC)
20  20 JAN 91 20/0900-20/1045 20/0907-20/1112
21  21 JAN 91 21/0900-21/1045
22  22 JAN 91 22/0900-22/1045
23  23 JAN 91 23/0900-23/1045
24  24 JAN 91 24/0900-24/1045
25  25 JAN 91 25/0900-25/1045
26  26 JAN 91 26/0845-26/1030
27  27 JAN 91 27/0845-27/1030
28  28 JAN 91 28/0845-28/1030
29  29 JAN 91 29/0845-29/1030
30  30 JAN 91 30/0830-30/1015
31  31 JAN 91 31/0830-31/1015
32  01 FEB 91 32/0830-32/1015
33  02 FEB 91 33/0815-33/1000
2. RECOMMENDATION: PRN6 WILL BE UNUSABLE FOR NAVIGATION OR
POSITIONING DURING THESE OUTAGES. CONFIRM AVAILABILITY OF
SATELLITES PRIOR TO USE.
3. POINT OF CONTACT: MAJ WILLIAM FAUVER AT COMMERCIAL
(719)550-6370 OR AUTOVON 560-6379.