NOTICE ADVISORY TO NAVSTAR USERS (NANU) #081-91113
SUBJ: C-FIELD TUNE: PRN15 (DAY 113) AND PRN3 (DAY 115)
1. CONDITION: DURING SCHEDULED MAINTENANCE ON PRN15 AND PRN3,
C-FIELD TUNES WILL BE ACCOMPLISHED. USERS WILL NOTICE A CHANGE TO
THE SV CLOCK FREQUENCY (DRIFT). NOTE THAT THE DATE AND TIME FOR
THE PRN15 OUTAGE HAS BEEN UPDATED FROM DAY 111 TO DAY 113. NANU
079 IS RESCINDED.
A. PRN15 (MCS: SVN15) IS SCHEDULED TO BE UNAVAILABLE (L-BANDS OFF)
BEGINNING DAY 113 (23 APR 91) BEGINNING 0300 UTC FOR UP TO 18
HOURS.
B. PRN3 (MCS: SVN11) IS SCHEDULED TO BE UNAVAILABLE (L-BANDS OFF)
BEGINNING DAY 115 (25 APR 91) BEGINNING 0200 UTC FOR UP TO 18
HOURS.
2. RECOMMENDATION: CONFIRM AVAILABILITY OF SATELLITES PRIOR TO USE.
3. POINT OF CONTACT: MAJOR FAUVER AT COMMERCIAL (719)550-6379
OR DSN: 560-6379.