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).
