TM 1–1520–238–T–3
5–12
Change 4
5–37 SIGNAL NAME:
GUN FIRE INHIBITED (ACY) NO OOC/BURSTLIMIT (ACZ)
MEMORY LOCATION: 001530
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates gun fire inhibited signal to FCC.
REMARKS: From GTCB through RH FAB MRTU Type I to FCC.
PASS:
If first digit displayed on HOD is 0, 1, 4, or 5, go to paragraph 5–38.
FAIL: Location of fault: GTCB, wiring from GTCB to RH FAB MRTU Type I. Troubleshoot wiring to
isolate fault (TM 9–1090–208–23–2).
5–38 SIGNAL NAME:
AZ LEAD TO GUN (ACY) GUN AZ LEAD CMD (ACZ)
MEMORY LOCATION: 001603
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while slewing gun: memory location response should indicate a negative
(sixth digit on the HOD is 1) when the azimuth lead angle error is to the left and a
positive (sixth digit on HOD is 0) when azimuth lead angle error is to the right.
SIGNAL FUNCTION:
Issues azimuth lead angle error signal (– left/+ right) to GTCB.
REMARKS: From FCC through RH FAB MRTU Type I to GTCB.
PASS:
If CONDITION corresponds to gun position, go to paragraph 5–39.
FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD).
5–39 SIGNAL NAME:
GUN OUT OF COINCIDENCE
MEMORY LOCATION: 001530
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates gun is not at command position.
REMARKS: From GTCB through RH FAB MRTU Type I to FCC.
PASS:
If third digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 5–40.
FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD).
5–40 SIGNAL NAME:
GUN AZ ERROR
MEMORY LOCATION: 001541
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while slewing gun: memory location response should indicate a negative
(sixth digit on the HOD is 1) when the gun azimuth error is to the left and a positive
(sixth digit on HOD is 0) when gun lead angle error is to the right.
SIGNAL FUNCTION:
Issues azimuth error signal (– left/+ right) to FCC.
REMARKS: From GTCB through RH FAB MRTU Type I to FCC.
PASS:
If CONDITION corresponds to gun position, go to paragraph 5–41.
FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD).
