TM 1–1520–238–T–3
12–3
12–2 SIGNAL NAME:
CPG SAFE/ARM SW
MEMORY LOCATION: 001075
MEMORY DATA BIT(S):
12–13
(BINARY)
CONDITION:
If the third digit displayed on HOD is 0 or 4=OFF
If the third digit displayed on HOD is 2 or 6=SAFE
If the third digit displayed on HOD is 3 or 7=ARM
SIGNAL FUNCTION:
Selects weapon system status.
REMARKS: From copilot/gunner (CPG) FCP through CPG MRTU Type III to FCC.
PASS:
If third digit displayed on HOD corresponds to the setting of CPG FCP SAFE/OFF/ARM
switch, go to paragraph 12–3.
FAIL: Location of fault: CPG FCP, wiring from CPG FCP to LH FAB MRTU Type I, LH FAB MRTU
Type I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
12–3 SIGNAL NAME:
SQUAT SW
MEMORY LOCATION: 001075
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Detects weight on wheels condition.
REMARKS: From CPG FCP through LH FAB MRTU Type I to FCC.
PASS:
If second digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 12–4.
FAIL: Location of fault: squat switch, wiring from squat switch to squat switch relay, squat switch
relay, wiring from squat switch relay 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 9–1427–475–20).
12–4 SIGNAL NAME:
PLT GND OVRD SW
MEMORY LOCATION: 001555
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates pilot/ground override (PLT/GND OVRD) switch position.
REMARKS: From pilot FCP through CPG FCP through LH MRTU Type I to FCC.
PASS:
If third digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 12–5.
FAIL: Location of fault: CPG FCP, wiring from CPG FCP to LH FAB MRTU Type I, LH FAB MRTU
Type I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
12–5 SIGNAL NAME:
CPG RKT NORM SW
MEMORY LOCATION: 000437
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Enables or disables arm/safe power to launchers.
REMARKS: From CPG FCP through CPG MRTU Type III to FCC.
PASS:
If second digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 12–6.
FAIL: Location of fault: MUX FAB R circuit breaker, wiring from MUX FAB R circuit breaker to RH
FAB MRTU Type I, RH FAB MRTU Type I. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–2).
