TM 1–1520–238–T–3 Change 4 5–11 5–32    SIGNAL NAME: PLT GUN NORMAL SW MEMORY LOCATION:    001120 MEMORY DATA BIT(S): 18 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Enables FCC control of gun. REMARKS:   From pilot FCP through LH FAB MRTU Type I to FCC. PASS: If first digit displayed on HOD is 2, 3, 6, or 7, go to paragraph 5–38. FAIL:    Location of fault: pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2). 5–33    SIGNAL NAME: PLT GUN TRIG MEMORY LOCATION:    001554 MEMORY DATA BIT(S): 14 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates whether pilot has pulled cyclic stick trigger. REMARKS:   From pilot FCP through RH FAB MRTU Type I to FCC. PASS: If second digit displayed on HOD is 4, 5, 6, or 7, go to paragraph 5–34. FAIL:    Location of fault: pilot FCP, wiring from pilot FCP to RH FAB MRTU Type I, RH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2). 5–34    SIGNAL NAME: PLT TRIG 1ST DETENT (ACY) PLT TRIG 1ST DTT (ACZ) MEMORY LOCATION:    001554 MEMORY DATA BIT(S): 15 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates pilot has pulled weapon trigger to first detent. REMARKS:   From pilot cyclic stick through pilot FCP and RH FAB MRTU Type I to FCC. PASS: If second digit displayed on HOD is 2, 3, 6, or 7, go to paragraph 5–35. FAIL:    Location of fault: pilot cyclic stick, wiring from pilot cyclic stick to pilot FCP, pilot FCP, wiring from pilot FCP to CPG FCP, CPG FCP, wiring from CPG FCP to LH FAB MRTU Type I, LH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2). 5–35    SIGNAL NAME: PLT TRIG 2ND DETENT (ACY) PLT TRIG 1ST DTT (ACZ) MEMORY LOCATION:    001554 MEMORY DATA BIT(S): 16 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates pilot has pulled weapon trigger to second detent. REMARKS:   From pilot cyclic stick through pilot FCP and RH FAB MRTU Type I to FCC. PASS: If second digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 5–36. FAIL:    Location of fault: pilot cyclic stick, wiring from pilot cyclic stick to pilot FCP, pilot FCP, wiring from pilot FCP to CPG FCP, CPG FCP wiring from CPG FCP to LH FAB MRTU Type I, LH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2). 5–36    SIGNAL NAME: GUN FIRE INHIBIT CMD (ACY) GUN FIRE ENABLE (ACZ) MEMORY LOCATION:    001627 MEMORY DATA BIT(S): 6 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Issues FCC command issued to inhibit gun firing. REMARKS:   From FCC through RH FAB MRTU Type I to GTCB. PASS: If fifth digit displayed on HOD is 2, 3, 6, or 7, go to paragraph 5–37. 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).