# SDR ASAA2020051232718

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 10, 2020
- Submitted: May 12, 2020
- Operation: Air carrier
- Aircraft: [N464AS](https://openairdocs.org/aircraft/N464AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40714
- Aircraft time: 23,707 hours, 7,486 cycles
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Sensor
- Condition: Malfunctioned
- Location: Window Heat
- Stage of operation: LD
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020051232718

## Discrepancy

REPEAT: RIGHT SIDE WINDOW OVERHEAT LIGHT ILLUMINATED AFTER LANDING, CYCLED THE WINDOW HEAT SWITCH, LIGHT EXTINGUISHED. GROUNDED - YES. ACCOMPLISHED WHCU BITE PROCEDURES 1 FAULT NOTED WINDOW SENSOR REF B737-900 FIM TASK 30-41 TASK 801. ACCOMPLISHED RESISTANCE OF WINDOW TEMP SENSOR ON RIGHT SIDE WINDOW. PRIMARY SHOWED 389 OHMS SWAPPED TO SPARE SENSOR LUB NOW READS 322 OHMS WITHIN MAINTS LIMITS REF B737-900 AMM 30-41-21-760-801. PERFORMED WINDOW HEAT SYS OPERATIONAL TEST GROUND VERIFICATION TEST PASSED NO FAULTS NOTED REF AMM 30-41-00-710-801. PERFORMED BITE PROCEDURE ON WHCU TEST PASSED NO FAULTS NOTED REF FIM TASK 30-41 TASK 801.

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