# SDR ASAA2018020623434

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 6, 2018
- Submitted: February 7, 2018
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 10,293 hours, 3,470 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Sensor
- Condition: Faulted
- Location: Window Heat
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018020623434

## Discrepancy

LEFT WINDSHIELD HEAT, L2 WINDOW INDICATES OVERHEAT.  ACFT GROUNDED.  UNABLE TO CONFIRM FAULT.  SENSORS RING OUT GOOD IAW AMM 30-41-21. ON WHCU, SENSOR FAULT SHOWS IN FAULT HISTORY.  DUE TO SENSOR FAULTS AND DUE TO PREVIOUS TROUBLESHOOTING ON L/P 11855285.  MOVED TO SPARE SENSOR. IAW AMM 30-41-00-420-801. OPS NORMAL.   ACCOMPLISHED WINDOW HEAT OPS TEST IAW AMM 30-41-00-710-801. GROUND VERIFICATION GOOD.

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