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MULTIPLEX READ CODE INTERPRETATIONS | Up
TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
1520-01-106-9519) (EIC: RHA) Multiplex Read Codes Manual | Next
ENGINE ANTI–ICE LRU FAULT ID (ACY) EICE FAULT ID (ACZ) |
TM 1–1520–238–T–3
Change 4
4–3
4–4 SIGNAL NAME:
WICE CONTROLLER (ACY) WICE CMPTER STAT (ACZ)
MEMORY LOCATION: 001117
MEMORY DATA BIT(S):
14
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates windshield de–ice controller status.
REMARKS: From temperature controller through LH FAB MRTU Type I to FCC. Generates fault
detection and location system (FD/LS) message CANOPY TEMP CONTROLLER
NO–GO CPG COMPARTMENT.
PASS:
If second digit on HOD is 4, 5, 6, or 7, go to paragraph 4–5.
FAIL: Location of fault: canopy temperature controller, wiring from canopy temperature controller to
LH FAB MRTU Type I, LH FAB MRTU Type I. Troubleshoot wiring to isolate fault
(TM 1–1520–238–T–8).
4–5 SIGNAL NAME:
WICE SENSOR STATUS
MEMORY LOCATION: 001117
MEMORY DATA BIT(S):
13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates windshield de–ice sensor status.
REMARKS: From pilot ANTI ICE panel through LH FAB MRTU Type I to FCC. Generates FD/LS
message CANOPY TEMP SENSOR NO–GO CPG FR WINDSHIELD.
PASS:
Location of fault if third digit on HOD is 1, 3, 5, or 7: ECS CANOPY ANTI–ICE CONTR circuit
breaker, wiring from ECS CANOPY ANTI–ICE CONTR circuit breaker to pilot ANTI–ICE panel
CANOPY HTR switch , pilot ANTI–ICE panel CANOPY HTR switch, pilot ANTI–ICE panel
CANOPY HTR switch wiring to canopy temperature controller,and ECS CANOPY ANTI–ICE
circuit breaker to canopy temperature controller, canopy temperature controller. Troubleshoot
wiring to isolate fault (TM 1–1520–238–T–8).
FAIL: Location of fault: windshield de–ice sensor, wiring from windshield de–ice sensor to canopy
temperature controller, canopy temperature controller, wiring from canopy temperature
controller to pilot ANTI ICE panel CANOPY HTR switch, wiring from pilot ANTI ICE panel
CANOPY HTR switch to LH FAB MRTU Type I, LH FAB MRTU Type I. Troubleshoot wiring to
isolate fault (TM 1–1520–238–T–8).
4–6 SIGNAL NAME:
EICE TST CMD
MEMORY LOCATION: 001220
MEMORY DATA BIT(S):
4
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates engine ice test–in–progress.
REMARKS: From FCC through LH FAB MRTU Type I to ice detector signal processor.
PASS:
If sixth digit on HOD is 0, go to paragraph 4–7.
FAIL: Location of fault: ice detector signal processor, wiring from ice detector signal processor to LH
FAB MRTU Type I, LH FAB MRTU Type I. Troubleshoot wiring to isolate fault
(TM 1–1520–238–T–8).
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