TM 1–1520–238–T–3
10–12
Change 4
10–42 SIGNAL NAME:
PNVS SLAVED TO TEU (ACY) PNVS SLAVED CMD (ACZ)
MEMORY LOCATION: 001245
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates HMD/PNVS cue mode selection.
REMARKS: From FCC through LH FAB MRTU Type I to TEU.
PASS:
Location of fault if fifth digit on HOD is 4, 5, 6, or 7: TEU, wiring from TEU to LH FAB MRTU
Type I, LH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 1–1270–476–T)
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).
10–43 SIGNAL NAME:
PLT ANTI–ICE SW
MEMORY LOCATION: 001117
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
Pilot ANTI–ICE PANEL SW to GND
SIGNAL FUNCTION:
Monitors position of pilot ANTI ICE panel TADS/PNVS switch.
REMARKS: From pilot ANTI ICE panel through left–hand (LH) forward avionics bay (FAB) MRTU
Type I to FCC. Enables or disables anti–ice functions for TADS/PNVS.
PASS:
If second digit on HOD is 1, 3, 5, or 7, go to paragraph 10–44.
FAIL: Location of fault: pilot ANTI ICE panel, wiring from pilot ANTI ICE panel to LH FAB MRTU Type
I, LH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–8).
10–44 SIGNAL NAME:
PNVS ANTI–ICE TO PEU (ACY) PNVS ANTIICE CMD (ACZ)
MEMORY LOCATION: 001632
MEMORY DATA BIT(S):
6
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Energizes relay to provide power for anti–ice.
REMARKS: From FCC through RH FAB MRTU Type I to PEU.
PASS:
Location of fault if fifth digit on HOD is 2, 3, 6, or 7: PNVS shroud, PEU, wiring from PEU to
RH FAB MRTU Type I, RH FAB MRTU Type I. Troubleshoot wiring to isolate fault
(TM 1–5855–265–T).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
10–45 SIGNAL NAME:
FAIL HIS (ACY)
MEMORY LOCATION: 000220
MEMORY DATA BIT(S):
4–19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Self–test failure flag (history 1).
REMARKS: Internal FCC self–test.
PASS:
If all digits on HOD are zero, go to paragraph 10–46.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
