1–5 FD/LS OPERATION – GENERAL (cont)

TM 1–1520–238–T–1 Change 5 1–15 1–5 FD/LS OPERATION – GENERAL (cont) 1–5 NOTE The loss or significant reduction in the FCC battery voltage could cause loss of all data in random access memory (RAM), including boresight correctors. If FCC battery voltage is suspect, refer to TM 9-1230-476-20-2 (ACY). If FCC LOAD (ACZ) or FCC LOAD FAIL , BST DATA LOAD FAIL, INIT DATA LOAD FAIL (ADD) message appears, perform boresight editing procedures TM 9-1230-476-20-1 SYSTEM CONTINUOUS MESSAGE MAINTENANCE MESSAGE GUN GUN BORESIGHT NO-GO GUN BORESIGHT NO-GO RAM CHECKSUM PYLONS PYLON BORESIGHT NO-GO PYLON BORESIGHT NO-GO RAM CHECKSUM TADS TADS BORESIGHT NO-GO TADS BORESIGHT NO-GO RAM CHECKSUM PNVS PNVS BORESIGHT NO-GO PNVS BORESIGHT NO-GO RAM CHECKSUM (7) Once a checksum error occurs, the boresight failure message remains until the operator edits (or re-enters) the boresight corrector from the aircraft log book for the affected system(s), or reboresighting is accomplished. 1–6 OPERATOR APPLICATIONS FOR THE DEK (ADC) – GENERAL. a. General Procedures for Operating FD/LS.