# SDR ASAA2020010631791

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 1, 2020
- Submitted: January 7, 2020
- Operation: Air carrier
- Aircraft: [N448AS](https://openairdocs.org/aircraft/N448AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36356
- Aircraft time: 14,818 hours, 4,770 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Control Unit
- Part number: 233A3201302
- Part serial: F06490
- Condition: Malfunctioned
- Location: Window Heat
- Part time: 14,849 hours, 4,777 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020010631791

## Discrepancy

SECOND WRITE UP OF RIGHT SIDE WINDOW HEAT OVERHEAT ILLUMINATED AND EXTINGUISHED PER QRH IN CLIMBOUT. GROUNDED - YES. ACCOMPLISHED WINDOW HEAT CONTROL UNIT BITE PROCEDURE REF B737-900 FIM 30-41 TASK 801. FOUND ON NO1 WHCU WINDOW #1 P5-9 FAULT AND ON NO2 WHCU WINDOW #2 P5-9 FAULT. INITIATED B737-900 FIM 30-41 TASK 813. REMOVED AND REPLACED P5-9 PANEL REF B737-900 AMM 30-41-41/401 OPC GOOD. PITOT PROBE, AOA SENSOR AND TAT PROBE HEATER SYSTEM AMM TASK 30-31-00-730-801 PASSED. ACCOMPLISHED BITE OPC GOOD. GROUND VERIFICATION SUCCESSFUL.

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