# SDR ASAA2021092836110

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 28, 2021
- Submitted: October 1, 2021
- Operation: Air carrier
- Aircraft: [N477AS](https://openairdocs.org/aircraft/N477AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40716
- Aircraft time: 22,551 hours, 7,057 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Sliding Window
- Part number: UNKNOWN
- Condition: Faulty
- Location: Flight Deck
- Stage of operation: DE
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021092836110

## Discrepancy

DESCENDING THROUGH 18,00' LEFT SIDE WINDOW OVERHEAT CAUTION ILLUMINATED. COMPLETED QRH PROCEDURE - WINDOW HEAT ILLUMINATED AGAIN. GROUNDED - YES. REF B737-900ER FIM 30-41 TASK 801 BITE SHOWS LH WINDOW SENSOR FAULT. VERIFIED FAULT REF FIM 30-41 TASK 811 PRIMARY SENSOR WAS OUT OF LIMITS. SWITCHED TO SPARE SENSOR. FAULT NO LONGER ACTIVE ALL TEST PASS WINDOW HEATS NORMALLY.

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