TM 1–1520–238–T–3
4–6
Change 4
4–12 SIGNAL NAME:
TAIL HEATER STATUS
MEMORY LOCATION: 002131
MEMORY DATA BIT(S):
4
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates tail rotor heater status.
REMARKS: From rotor blade de–ice controller through DASEC to FCC. Generates FD/LS message
TAIL ROTOR HEATER NO–GO TAIL ROTOR.
PASS:
Location of fault if sixth digit on HOD is 1: ECS ICE DET circuit breaker, wiring from ECS ICE
DET circuit breaker to ice detector signal processor, ice detector signal processor, BLADE
DE–ICE circuit breaker, wiring from BLADE DE–ICE circuit breaker to BLADE DE–ICE
REMOTE CONTROL circuit breaker, BLADE DE–ICE REMOTE CONTROL circuit breaker,
wiring from BLADE DE–ICE REMOTE CONTROL circuit breaker to rotor blade de–ice
controller, ECS BLADE DE–ICE CONTR circuit breaker, wiring from ECS BLADE DE–ICE
CONTR circuit breaker to pilot ANTI–ICE panel, pilot ANTI–ICE panel, wiring from pilot
ANTI–ICE panel to rotor blade de–ice controller, rotor blade de–ice controller, wiring from
rotor blade de–ice controller to blade de–ice relay, blade de–ice relay, wiring from rotor rotor
blade de–ice controller to tail rotor slip ring assembly, tail rotor slip ring assembly, wiring from
tail rotor slip ring assembly to tail rotor blade, tail rotor blade. Troubleshoot wiring to isolate
fault (TM 1–1520–238–T–8).
FAIL: Location of fault: rotor blade de–ice controller, wiring from rotor blade de–ice controller to slip
ring assembly, slip ring assembly, ,wiring from slip ring assembly to tail rotor blades, tail rotor
blades,wiring from rotor blade de–ice controller to DASEC, DASEC. Troubleshoot wiring to
isolate fault (TM 1–1520–238–T–8).
4–13 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:
Indicates PNVS anti–ice selection.
REMARKS: From FCC through right–hand (RH) FAB MRTU Type I to PNVS electronic unit (PEU).
PASS:
Location of fault if second digit on HOD is 2, 3, 6, or 7: wiring between PEU and TADS PNVS
turret assembly, and wiring between PEU and TEU. Troubleshoot wiring to isolate fault
(TM 1–5855–265–T).
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).
4–14 SIGNAL NAME:
TADS ANTI–ICE TO TPS (ACY) TADS ANTIICE CMD (ACZ)
MEMORY LOCATION: 001220
MEMORY DATA BIT(S):
14
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates TADS anti–ice selection.
REMARKS: From FCC through LH FAB MRTU Type I to TADS power supply (TPS).
PASS:
If second digit on HOD is 4, 5, 6, or 7, go to paragraph 4–15.
FAIL: Location of fault: LH FAB MRTU Type I, wiring from LH FAB MRTU Type I to TPS, TPS, FCC.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
