TM 1–1520–238–T–3
11–3
11–2 SIGNAL NAME:
CPG SAFE/ARM
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:
Indicates FCP copilot/gunner (CPG) ARM/SAFE switch position.
REMARKS: From CPG FCP ARM/SAFE switch through LH FAB MRTU Type I to FCC. Enables
SAFE/ARM weapons system functions.
PASS:
If CONDITION corresponds to proper mode for switch position selected, go to
paragraph 11–3.
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).
11–3 SIGNAL NAME:
PLT/GND OVRD
MEMORY LOCATION: 001555
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates CPG FCP PLT/GND ORIDE switch position.
REMARKS: From CPG FCP through right–hand (RH) FAB MRTU Type I to FCC. Overrides pilot
control of weapons systems. Enables weapons systems on ground.
PASS:
If third digit on HOD is 1, 3, 5, or 7, go to paragraph 11–4.
FAIL: Location of fault: CPG FCP, wiring from CPG FCP to RH FAB MRTU Type I, RH FAB MRTU
Type I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
11–4 SIGNAL NAME:
SQUAT SWITCH
MEMORY LOCATION: 001075
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates squat switch position.
REMARKS: From squat switch through squat switch relay and LH FAB MRTU Type I to FCC.
Indicates to aircraft systems that aircraft is on ground.
PASS:
If second digit on HOD is 0, 2, 4, or 6, go to paragraph 11–5.
FAIL: Location of fault: squat switch, squat switch relay, wiring from squat switch to pilot and CPG fire
control panels. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
11–5 SIGNAL NAME:
RHE SQUAT SW
MEMORY LOCATION: 001440
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates squat switch position to remote HELLFIRE electronics (RHE).
REMARKS: From FCC to RHE.
PASS:
If third digit on HOD is 4, 5, 6, or 7, go to paragraph 11–6.
FAIL: Location of fault: wiring from external stores controller to pilot circuit breaker panel, RHE.
Troubleshoot wiring to isolate fault (TM 1–1520–238–T–8).
