TM 1–1520–238–T–3
5–2
Change 5
Personnel Required:
(2)
References:
TM 1–1270–476–T
TM 1–1520–238–T–6
TM 1–5855–265–T
TM 9–1090–208–23–2
TM 9–1230–476–20–2
TM 9–1270–221–23
Equipment Conditions:
Ref
Condition
TM 9–1090–208–23–2
GUN AND CONTROL
SUBSYSTEM –
MAINTENANCE
OPERATIONAL CHECK in
progress
NOTE
All multiplex read code responses are read from right to
left.
Multiplex read codes must be used in conjunction with
applicable Maintenance Operational Check (MOC) in
progress.
Multiplex read codes are observed on the HOD (ADC) or
CDU (ADD).
MULTIPLEX READ CODE INTERPRETATIONS
5–1 SIGNAL NAME:
PLT SAFE/ARM SW
MEMORY LOCATION: 001120
MEMORY DATA BIT(S):
12–13
(BINARY)
CONDITION:
If the third digit displayed on heads out display (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 pilot fire control panel (FCP) through left–hand (LH) forward avionics bay (FAB)
multiplex remote terminal unit (MRTU) Type I to fire control computer (FCC).
PASS:
If CONDITION displayed on HOD corresponds to the setting of pilot FCP SAFE/ARM switch,
go to paragraph 5–2.
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).
5–2 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) fire control panel (FCP) through CPG MRTU Type III to FCC.
PASS:
If CONDITION displayed on HOD corresponds to the setting of CPG FCP SAFE/ARM switch,
go to paragraph 5–3.
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).
