SINE EL TO GUN (ACY) GUN SINE EL CMD (ACD & ACZ)

TM 1–1520–238–T–3 5–14 Change 4 5–45 SIGNAL NAME: SINE EL TO GUN (ACY) GUN SINE EL CMD (ACD & ACZ) MEMORY LOCATION: 001647 MEMORY DATA BIT(S): 4–19 (ACY) 4–15 (ACD & ACZ) (SCALAR) CONDITION: Monitor HOD while slewing gun: memory location response should indicate a negative (sixth digit on HOD is 1) when the sine elevation is down and a positive (sixth digit on HOD is 0) when sine elevation is up. SIGNAL FUNCTION: Issues LOS elevation signal (– down/+ up) to gun. REMARKS: From FCC through RH FAB MRTU Type I to GTCB. PASS: If CONDITION corresponds to gun position, go to paragraph 5–46. FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD). 5–46 SIGNAL NAME: COS EL TO GUN (ACY) GUN COS EL CMD (ACD & ACZ) MEMORY LOCATION: 001650 MEMORY DATA BIT(S): 4–19 (ACY) 4–15 (ACD & ACZ) (SCALAR) CONDITION: Monitor HOD while slewing gun: memory location response should indicate a negative (sixth digit on the HOD is 1) when the cosine elevation is down and a positive (sixth digit on HOD is 0) when cosine elevation is up. SIGNAL FUNCTION: Issues LOS elevation signal (– down/+ up) to gun. REMARKS: From FCC through RH FAB MRTU Type I to GTCB. PASS: If CONDITION corresponds to gun position, go to paragraph 5–47. FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD). 5–47 SIGNAL NAME: GUN BRSIT MODE CMD MEMORY LOCATION: 001627 MEMORY DATA BIT(S): 7 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Enables gun boresight alignment procedures. REMARKS: From FCC through RH FAB MRTU Type I to GTCB. PASS: Location of fault if fifth digit displayed on HOD is 0, 2, 4, or 6: GTCB, wiring from GTCB to RH FAB MRTU Type I, RH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2). FAIL: Location of fault: RH FAB MRTU Type I, wiring from RH FAB MRTU Type I to GTCB, GTCB. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2).