# SDR ASAA2019050929300

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 2019
- Submitted: May 15, 2019
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 15,336 hours, 4,992 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Sensor
- Part number: 56100025
- Part serial: 15106H9525
- Condition: Failed
- Location: Cockpit
- Part time: 15,385 hours, 5,009 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019050929300

## Discrepancy

LEFT SIDE WINDOW HEAT "OVERHEAT" LIGHT ILLUMINATED TWICE IN FLIGHT. GROUNDED - YES. CHECKED & RELEASED LT "SIDE" SLIDER WINDOW HEAT PER MEL 30-11E. ETOPS "A/C HAS HISTORY". PERFORMED HISTORY BITE TEST OF LT NR 2 WHCU AND FOUND WINDOW SENSOR FAULTS PER FIM 30-41 TASK 801. CHANGED TERMINAL LUG ON WINDOW HEAT SENSOR FROM PRIMARY TO SPARE AND PERFORMED GOOD RESISTANCE CHECK PER AMM 30-41-21-760-801. PERFORMED GOOD OPS TEST OF LT NR 2 WINDOW HEAT PER AMM 30-41-00-710-801. THIS CLEARS MEL 30-11E.

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