TM 1–1520–238–T–3
4–4
Change 4
4–7 SIGNAL NAME:
ENGINE ANTI–ICE LRU FAULT ID (ACY) EICE FAULT ID (ACZ)
MEMORY LOCATION: 002131
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
If first digit displayed on HOD is 0, 1, 4 or 5=ICE DETECTOR SIGNAL PROCESSOR
If first digit displayed on HOD is 2, 3, 6 or 7=SENSOR
SIGNAL FUNCTION:
Identifies LRU failure.
REMARKS: From ice detector sensor through ice detector signal processor through digital automatic
stabilization equipment computer (DASEC) MRTU to FCC. Generates FD/LS message
ICE DETECTOR SENSOR NO–GO ENG INLET LH SIDE (ACY), ICE DETECTOR
SENSOR NO–GO DOGHOUSE FAIRING (ACZ), or ICE DETECTOR CONTROLLER
NO–GO FIREWALL LH SIDE.
PASS:
If first digit on HOD is 1, 2, or 3, go to paragraph 4–8.
FAIL: Location of fault: ice detector sensor, wiring from ice detector sensor to ice detector signal
processor, ice detector signal processor, wiring from ice detector signal processor to DASEC,
DASEC. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–8).
4–8 SIGNAL NAME:
ENGINE ANTI–ICE STATUS (ACY) EICE STAT (ACZ)
MEMORY LOCATION: 002131
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates engine anti–ice system status.
REMARKS: From ice detector signal processor through DASEC to FCC.
PASS:
Location of fault if first digit on HOD is 1, 4, or 5: ECS R NOSE GRBX HTR, ECS L NOSE
GRBX HTR, and ECS ENGINE ANTI–ICE circuit breakers, wiring from ECS R NOSE GRBX
HTR, ECS L NOSE GRBX HTR, and ECS ENGINE ANTI–ICE circuit breakers to ice detector
signal processor, ice detector signal processor, wiring from ice detector signal processor to
pilot caution/warning panel, pilot caution warning panel. Troubleshoot wiring to isolate fault
(TM 1–1520–238–T–8).
FAIL: Location of fault: ice detector signal processor, wiring from ice detector signal processor to
DASEC, DASEC. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–8).
4–9 SIGNAL NAME:
RICE CONT STATUS (ACY) RICE CMPTR STAT (ACZ)
MEMORY LOCATION: 002131
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates rotor anti–ice controller status.
REMARKS: From rotor blade de–ice controller through DASEC to FCC. Generates FD/LS message
RTR BLADE PWR CONTROLLER NO–GO RH XMSN BAY (ACY) or RTR BLADE PWR
CONT NO–GO RH XMSN BAY (ACZ).
PASS:
If first digit on HOD is 1, 3, 5, or 7, go to failure symptom index and next failure symptom
paragraph.
FAIL: Location of fault: rotor blade de–ice controller, main rotor and tail rotor slip ring assemblies,
main rotor and tail rotor blades, wiring from rotor blade de–ice controller to main rotor and tail
rotor slip ring assemblies, wiring from main rotor and tail rotor slip ring assemblies to main rotor
and tail blades, wiring from rotor blade de–ice controller to DASEC, DASEC. Troubleshoot
wiring to isolate fault (TM 1–1520–238–T–8).
