# SDR ASAA2021050534753

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 5, 2021
- Submitted: May 10, 2021
- Operation: Air carrier
- Aircraft: [N472AS](https://openairdocs.org/aircraft/N472AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60580
- Aircraft time: 22,681 hours, 7,146 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Sensor
- Condition: Miswired
- Location: Lt Window
- Stage of operation: NR
- How discovered: 9
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021050534753

## Discrepancy

WINDOW HEAT LEFT/SIDE WINDOW OVRHEAT. QRH 3.6 OVERHEAT DID NOT GO OUT. GROUNDED - YES. ACCOMPLISHED B737-900 AMM TASK 30-41-00-420-801 AND SWAPPED WIRE TO SPARE SENSOR FROM PRIMARY. ACCOMPLISHED BIT/VERIFY ON WINDOW HEAT CONTROL UNIT AND NO FAULTS WERE FOUND. ALL GROUND VERIFICATION TESTS SUCCESSFUL.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.