TM 1–1520–238–T–3
Change 4
8–11
8–3 SIGNAL NAME:
PLT GND OVRD SW
MEMORY LOCATION: 001555
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates pilot ground/override switch position.
REMARKS: From CPG FCP through right–hand (RH) FAB MRTU Type I to FCC.
PASS:
If third digit displayed on heads out display (HOD) is 1, 3, 5, or 7, go to paragraph 8–4.
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).
8–4 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 on HOD is 0, 2, 4, or 6, go to paragraph 8–5.
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).
8–5 SIGNAL NAME:
SQUAT SW (ACY) RHE SQUAT SW CMD (ACZ)
MEMORY LOCATION: 001440
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Detects weight on wheels condition.
REMARKS: From FCC to remote HELLFIRE electronics (RHE).
PASS:
If third digit on HOD is 0, 1, 2, or 3, go to paragraph 8–6.
FAIL: Location of fault: squat switch, wiring from squat switch to RHE, RHE. Troubleshoot wiring to
isolate fault (TM 9–1427–475–20).
8–6 SIGNAL NAME:
CPG MISSILE ENABLE
MEMORY LOCATION: 001555
MEMORY DATA BIT(S):
15
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Enables safe and arming of missiles.
REMARKS: From CPG FCP to launcher.
PASS:
If second digit on HOD is 2, 3, 6, or 7, go to paragraph 8–7.
FAIL: Location of fault: CPG FCP, wiring from CPG FCP to launchers, launchers. Troubleshoot wiring
to isolate fault (TM 9–1427–475–20).
8–7 SIGNAL NAME:
PLT MISSILE ENABLE
MEMORY LOCATION: 001120
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Enables safe and arming of missiles.
REMARKS: From pilot FCP through CPG FCP to launcher.
PASS:
If first digit on HOD is 4, 5, 6, or 7, go to paragraph 8–8.
FAIL: Location of fault: pilot FCP, wiring from pilot FCP to CPG FCP, wiring from CPG FCP to
launcher, launchers. Troubleshoot wiring to isolate fault (TM 9–1427–475–20).
