# SDR ASAA2017032820288

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 28, 2017
- Submitted: March 30, 2017
- Operation: Air carrier
- Aircraft: [N481AS](https://openairdocs.org/aircraft/N481AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44106
- Aircraft time: 6,615 hours, 2,229 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Control Unit
- Part number: 56100025
- Condition: Failed
- Location: L2  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/ASAA2017032820288

## Discrepancy

LEFT SIDE WINDOW HEAT OVER HEAT LIGHT ILLUMINATED, RAN CHECKLIST, LIGHT REMAINED OUT.  ACFT GROUNDED. BITE CHECK OF LEFT SIDE WINDOW HEAT CONTROL UNIT LOGGED 7 SENSOR FAULTS.  MOVED TEMP SENSOR FROM PRIMARY TO SECONDARY IAW FIM 30-41/811. ACCOMPLISHED WHCU SYSTEM TEST, CLEARED LEFT SIDE WINDOW FAULT HISTORY. SYSTEM TEST PASSES IAW AMM 30-41-11/501.

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