SDR ASAA2018020623434

Service difficulty report · Sensor · Boeing 737990ER

Difficulty date: February 6, 2018
Submitted: February 7, 2018
Operation: Air carrier
Aircraft: N478AS
Make and model: Boeing 737990ER
Aircraft serial: 44105
Aircraft time: 10,293 hours, 3,470 cycles
System (JASC): 3040 · Windshield/Door Rain/Ice Removal
Part: Sensor
Condition: Faulted
Location: Window Heat
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

LEFT WINDSHIELD HEAT, L2 WINDOW INDICATES OVERHEAT. ACFT GROUNDED. UNABLE TO CONFIRM FAULT. SENSORS RING OUT GOOD IAW AMM 30-41-21. ON WHCU, SENSOR FAULT SHOWS IN FAULT HISTORY. DUE TO SENSOR FAULTS AND DUE TO PREVIOUS TROUBLESHOOTING ON L/P 11855285. MOVED TO SPARE SENSOR. IAW AMM 30-41-00-420-801. OPS NORMAL. ACCOMPLISHED WINDOW HEAT OPS TEST IAW AMM 30-41-00-710-801. GROUND VERIFICATION GOOD.