# SDR ASAA2022020137327

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2022
- Submitted: February 10, 2022
- Operation: Air carrier
- Aircraft: [N474AS](https://openairdocs.org/aircraft/N474AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40715
- Aircraft time: 24,695 hours, 7,801 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Heater
- Condition: Intermittent
- Location: Window
- Part time: 19,294 hours, 6,001 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: M
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022020137327

## Discrepancy

RIGHT SIDE WINDOW HEAT "OVERHEAT" CAME ON. GROUNDED - YES. PERFORMED WINDOW HEAT CONTROL UNIT BITE CHECK ON RH WINDOW NO.2 (M320) REF B737-900 FIM 30-41 TASK 801 FOUND FAULT (P5-9 CONTROL POWER) WINDOW HEAT WORKS INTERMITTENT TURNS ON/OFF  PER B737-900 FIM 30-41 TASK 813 WIRING CHECKS GOOD. REMOVED & REPLACED WINDOW/PITOT HEAT MODULE (P5-9). PITOT HEAT TESTS PASS, WINDOW HEAT TESTS PASS REF AMM 30-41-41/401.OPERATED R/H NO. 2 WINDOW HEAT SYSTEM. SYSTEM OPERATES NORMAL AND P5-9 PANEL FUNCTIONS AS NORMAL. REF AMM 30-41-00.

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