# SDR ASAA2021071935449

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2021
- Submitted: July 22, 2021
- Operation: Air carrier
- Aircraft: [N469AS](https://openairdocs.org/aircraft/N469AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41702
- Aircraft time: 26,247 hours, 8,466 cycles
- System (JASC): [3097 · Ice/Rain Protection System Wiring](https://openairdocs.org/jasc/3097)
- Part: Terminal
- Condition: Damaged
- Location: Wndo Heat Sensor
- Stage of operation: DE
- How discovered: V
- Nature of condition: M
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021071935449

## Discrepancy

ON DESCENT RECEIVED OVERHEAT LIGHT ON LEFT SIDE COCKPIT WINDOW (L2) ACCOMPLISHED QRH CHECKLIST "ON" LIGHT DID NOT ILLUMINATE AFTER ACCOMPLISHING CHECKLIST PROCEDURE. GROUNDED - YES. LEFT SIDE WHCU FAULT HIST LOGGED MULTIPLE SENSOR FAULTS. REF B737-900 FIM 30-41 TASK 811, MOVED SENSOR TERMINAL TO SPARE SENSOR TERMINAL, WHCU BITE GOOD W/O FAULTS. LEFT SIDE WINDOW HEAT OPS CHECKED OK.

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