TM 1–1520–238–T–3
Change 4
10–3
10–5 SIGNAL NAME:
CPG SIGHT SEL SW
MEMORY LOCATION: 001074
MEMORY DATA BIT(S):
4–6
(OCTAL)
CONDITION:
If the fifth digit displayed on HOD is 0 or 1=HMD/TADS (Chapter 15, paragraph 15–5)
If the fifth digit displayed on HOD is 2 or 3=TADS (Chapter 15, paragraph 15–5)
If the sixth digit displayed on HOD is 1=NVS (Chapter 10, paragraph 10–6)
If the sixth digit displayed on HOD is 1 and the fifth digit displayed on HOD is 2 or 3
=HMD (Chapter 7, paragraph 7–56)
SIGNAL FUNCTION:
Selects copilot/gunner (CPG) sight sensor.
REMARKS: From CPG FCP through LH FAB MRTU Type I to FCC.
PASS:
If CONDITION displayed on HOD corresponds to CPG SIGHT SEL switch position, refer to
appropriate chapter and paragraph as listed under CONDITION.
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).
10–6 SIGNAL NAME:
PNVS OPERATE TO PEU
MEMORY LOCATION: 001632
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Selects PNVS as line of sight (LOS) sensor.
REMARKS: From FCC through RH FAB MRTU Type I to PEU.
PASS:
If fifth digit on HOD is 4, 5, 6, or 7, go to paragraph 10–7.
FAIL: Location of fault: RH FAB MRTU Type I, wiring from RH FAB MRTU Type I to PEU, PEU.
Troubleshoot wiring to isolate fault (TM 1–5855–265–T).
10–7 SIGNAL NAME:
PNVS STBY TPS (ACY) PNVS STBY CMD (ACZ)
MEMORY LOCATION: 001220
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates pilot has turned on PNVS.
REMARKS: From FCC through LH FAB MRTU Type I to TADS power supply (TPS).
PASS:
If first digit on HOD is 4, 5, 6, or 7, go to paragraph 10–8.
FAIL: Location of fault: LH FAB MRTU Type I, wiring from LH FAB MRTU Type I to TPS, TPS.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
10–8 SIGNAL NAME:
PNVS OPERATE TO TPS (ACY) PNVS OPERATE CMD (ACZ)
MEMORY LOCATION: 001220
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates that either CPG or pilot has selected PNVS as sight sensor.
REMARKS: From FCC through LH FAB MRTU Type I to TPS.
PASS:
Location of fault if third digit on HOD is 1, 3, 5, or 7: TPS, wiring from TPS to TEU, TEU, wiring
from TEU to PEU, PEU. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
FAIL: Location of fault: LH FAB MRTU Type I, wiring from LH FAB MRTU Type I to TPS, TPS.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
