TM 1–1520–238–T–3
Change 4
4–5
4–10 SIGNAL NAME:
MAIN HEATER STATUS
MEMORY LOCATION: 002131
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates main rotor heater status.
REMARKS: From rotor blade de–ice controller through DASEC to FCC. Generates FD/LS message
MAIN ROTOR HEATER NO–GO MAIN ROTOR.
PASS:
If fifth digit on HOD is 4, 5, 6, or 7, go to paragraph 4–11.
FAIL: Location of fault: rotor blade de–ice controller, slip ring assembly, main rotor blades, wiring from
rotor blade de–ice controller to slip ring assembly, from slip ring assembly to main rotor blades,
from rotor blade de–ice controller to DASEC, DASEC. Troubleshoot wiring to isolate fault
(TM 1–1520–238–T–8).
4–11 SIGNAL NAME:
ROTOR ICE DISTR STATUS (ACY) RICE DIST STAT (ACZ)
MEMORY LOCATION: 002131
MEMORY DATA BIT(S):
6
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates power distribution status.
REMARKS: From rotor blade de–ice controller through DASEC to FCC. Generates FD/LS message
RTR BLADE DISTR DE–ICE NO–GO MAIN ROTOR MAST.
PASS:
Location of fault if fifth digit on HOD is 2, 3, 6, or 7: ECS ICE DET circuit breaker, wiring from
ECS ICE DET circuit breaker to ice detector signal processor, ECS BLADE DE–ICE circuit
breaker, wiring from ECS 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 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. 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
DASEC, DASEC. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–8).
