# SDR ASAA1158713

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 29, 2010
- Submitted: January 4, 2011
- Operation: Air carrier
- Aircraft: [N590AS](https://openairdocs.org/aircraft/N590AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35687
- Aircraft time: 11,105 hours, 3,543 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Control Unit
- Part number: 8300005604
- Part serial: 12035D
- Condition: Failed
- Location: E&E Bay
- Part time: 11,105 hours, 3,453 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA1158713

## Discrepancy

L SIDE WINDOW HEAT OVERHEAT LIGHT ILLUMINATED AT CRUISE ALTITUDE (FL350).  PERFORMED QRH PROCEDURE (PAGE 3.3) OVERHEAT LIGHT STAYED EXTINGUISHED.  CHECKED PER FIM 30 41 TASK 811 STEP F (1)(2) AND G.  SENSORS BOTH CHECK GOOD. 284 OHMS.  REPLACED L SIDE WHCU.  REF MM 30 41 00 000 801 & 30 41 11 400 801.  OP CHECK NORMAL.

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