TM 1–1520–238–T–3
5–3
5–3 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 5–4.
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, wiring from CPG FCP to LH FAB MRTU Type
I, LH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–6).
5–4 SIGNAL NAME:
PLT GND OVRD SW
MEMORY LOCATION: 001555
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
If the third digit displayed on HOD is 0, 2, 4, or 6=OFF
If the third digit displayed on HOD is 1, 3, 5, or 7=ON
SIGNAL FUNCTION:
Indicates pilot/ground override (PLT/GND OVRD) switch position.
REMARKS: From CPG FCP through LH MRTU Type I to FCC.
PASS:
If CONDITION displayed on HOD corresponds to selected switch position, go to paragraph
5–5.
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).
5–5 SIGNAL NAME:
GUN BIT CMD
MEMORY LOCATION: 001627
MEMORY DATA BIT(S):
8
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates gun turret control box (GTCB) self–test request.
REMARKS: From FCC through right–hand (RH) FAB MRTU Type I to GTCB.
PASS:
If fourth digit displayed on HOD is 4, 5, 6, or 7, go to paragraph 5–6.
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).
5–6 SIGNAL NAME:
GUN TEST IN PROGRESS
MEMORY LOCATION: 001530
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates GTCB self–test in progress.
REMARKS: From GTCB through RH FAB MRTU Type I to FCC.
PASS:
If first digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 5–7.
FAIL: Location of fault: 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).
