# SDR ASAA2022120441025

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 4, 2022
- Submitted: December 6, 2022
- Operation: Air carrier
- Aircraft: [N942AK](https://openairdocs.org/aircraft/N942AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44102
- Aircraft time: 1,505 hours, 432 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Control Unit
- Condition: Faulted
- Location: Window Overheat
- Part time: 1,493 hours, 429 cycles
- Stage of operation: LD
- 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/ASAA2022120441025

## Discrepancy

WINDSHIELD RIGHT FWD OVERHEAT ON LANDING. GROUNDED - YES. REF B737-9 IFIM 30-41-00-810-829: CYCLING WINDOW HEAT SWITCH AFTER COOLING PERIOD. DOES NOT RESOLVE OVERHEAT INDICATION. WINDOW REMAINED COOL TO TOUCH. ACCOMPLISHED RESPECTIVE WHCU BITE PROCEDURE (WITHIN B737-9 AMM 30-41-11-710-80D. CURRENT FAULT IS P5-9, WITH WHCU-LRU SET FOR LAST SEVERAL LEGS. (NOTE: WHCU BIT-LAMP RESET NOT CLEAR CURRENT FAULT EITHER.) REMOVED AND INSTALLED NEW WHCU M323. PERFORMED SYS OPS TEST REF AMM 30-41-11-400-801. SYS OPS NML.

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