TM 1–1520–238–T–3
10–8
Change 4
10–25 SIGNAL NAME:
ORT ACM SWITCH (ACY) CPG ACM SW (ACZ)
MEMORY LOCATION: 000414
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Selects optimum gain of night vision sensor.
REMARKS: From ORT through CPG MRTU Type III to FCC.
PASS:
If fifth digit on HOD is 0, 1, 2, or 3, go to paragraph 10–26.
FAIL: Location of fault: ORT, wiring from ORT to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
10–26 SIGNAL NAME:
PNVS ACM CONTROL (AAD) PNVS ACM CMD (ACZ)
MEMORY LOCATION: 001627
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates selection of automatic control module (ACM) mode.
REMARKS: From FCC through RH FAB MRTU Type I to TADS/PNVS turret assembly.
PASS:
If fourth digit on HOD is 1, 3, 5, or 7, replace PEU (TM 1–5855–265–T).
FAIL: Location of fault: RH FAB MRTU Type I, wiring from RH FAB MRTU Type I through RH FAB
crossover to TADS/PNVS turret assembly. Troubleshoot wiring to isolate fault
(TM 1–5855–265–T).
10–27 SIGNAL NAME:
CPG PLRT SWITCH (ACY) ORT PLRT SW (ACZ)
MEMORY LOCATION: 000414
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Selects polarity mode.
REMARKS: From CPG collective through CPG MRTU Type III to FCC.
PASS:
If third digit on HOD is 0, 1, 2, or 3, go to paragraph 10–28.
FAIL: Location of fault: CPG collective, wiring from CPG collective to CPG MRTU Type III, CPG
MRTU Type III. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
10–28 SIGNAL NAME:
PILOT PLRT SWITCH
MEMORY LOCATION: 001120
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Selects polarity mode.
REMARKS: From pilot collective through LH FAB MRTU Type I to FCC.
PASS:
If fourth digit on HOD is 0, 2, 4, or 6, go to paragraph 10–29.
FAIL: Location of fault: pilot collective, wiring from pilot collective to LH FAB MRTU Type I, LH FAB
MRTU Type I. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
10–29 SIGNAL NAME:
PNVS POLARITY CONTROL (AAD) PNVS PLRT CMD (ACZ)
MEMORY LOCATION: 001627
MEMORY DATA BIT(S):
9
(BINARY)
CONDITION:
If fourth digit displayed on HOD is 0, 1, 4, or 5=BLACK
If fourth digit displayed on HOD is 2, 3, 6, or 7=WHITE
SIGNAL FUNCTION:
Selects polarity.
REMARKS: From FCC through RH FAB MRTU Type I to TADS/PNVS turret assembly.
PASS:
If CONDITION corresponds to correct polarity, troubleshoot PEU (TM 1–5855–265–T).
FAIL: Location of fault: RH FAB MRTU Type I, wiring from RH FAB MRTU Type I through RH FAB
crossover to TADS/PNVS turret assembly. Troubleshoot wiring to isolate fault
(TM 1–5855–265–T).
