# SDR ASAA2019121631578

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 10, 2019
- Submitted: December 17, 2019
- Operation: Air carrier
- Aircraft: [N495AS](https://openairdocs.org/aircraft/N495AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41728
- Aircraft time: 15,050 hours, 4,836 cycles
- Engine: Cfmint CFM567B27E
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Sensor
- Condition: Failed
- Location: Sliding Window
- Part time: 15,097 hours, 4,849 cycles
- Stage of operation: CR
- 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/ASAA2019121631578

## Discrepancy

RT SIDE WINDOW OVERHEAT LT ILLUMINATED IN FLIGHT. DID QRH PROCEDURE. LT CAME BACK ON AFTER 4 MIN OFF. GROUNDED - YES. PERFORMED WINDOW HEAT CONTROL UNIT BITE PROCEDURE PER B737-900 FIM 30-41 TASK 801. FOUND WINDOW SENSOR FAULT MULTIPLE TIMES IN HISTORY. PERFORMED WINDOW TEMP SENSOR RESISTANCE MEASUREMENTS PER B737-900 AMM 30-41-21-760-801. RESISTANCE CHECK FAILED. FOUND TERMINAL ALREADY ON SPARE SENSOR. REMOVED AND REPLACED RT SIDE WINDOW PER B737-900 AMM 56-12-11, OPS CHECK GOOD.

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