# SDR ASAA2019011227758

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 12, 2019
- Submitted: January 15, 2019
- Operation: Air carrier
- Aircraft: [N474AS](https://openairdocs.org/aircraft/N474AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40715
- Aircraft time: 14,093 hours, 4,660 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Sensor
- Part number: 56100025
- Part serial: 15096H8277
- Condition: Failed
- Location: Window
- Part time: 14,104 hours, 4,664 cycles
- Stage of operation: CR
- 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/ASAA2019011227758

## Discrepancy

WHILE AT 34000 FT L SIDE WINDOW OVERHEAT LIGHT ILLUMINATED. TURNED WINDOW HEAT SWITCH OFF PER QRH PROC. AFTER 5 MINUTES TURNED L SIDE WINDOW HEAT SWITCH ON. CLIMBED TO 38000 FT OUTSIDE AIR -51C SAT, -24C TAT. AFTER 17 MINUTES L SIDE WINDOW OVERHEAT LIGHT ILLUMINATED AGAIN. GROUNDED - YES. REMOVED AND REPLACED LEFT SIDE NR 2 WINDOW PER AMM 56-12-11. WINDOW HEAT OPS TEST GOOD PER AMM 30-41-00 PER FIM 30-41 TASK 811 WHCU BIT TEST GOOD.

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