SDR ASAA2020101633365

Service difficulty report · Heater · Boeing 737890

Difficulty date: October 16, 2020
Submitted: October 19, 2020
Operation: Air carrier
Aircraft: N537AS
Make and model: Boeing 737890
Aircraft serial: 35204
Aircraft time: 33,111 hours, 9,650 cycles
System (JASC): 3040 · Windshield/Door Rain/Ice Removal
Part: Heater
Condition: Faulted
Location: Sliding Window
Part time: 21,674 hours, 6,388 cycles
Stage of operation: NR
How discovered: O
Nature of condition: M, 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 SIDE WINDOW OVER HEAT LIGHT ILLUMINATED. PERFORMED QRH PROCEDURE. THE LIGHT REMAINED ILLUMINATED. GROUNDED-YES. ACCOMPLISHED B737-800 FIM 30-41 TASK 814 AND FOUND LEFT SIDE WINDOW POWER FAULT ON THE WHCU BITE HISTORY. RANG OUT LEFT SIDE HEATER ELEMENT AND FOUND RESISTANCE OUT OF LIMITS. GD1354-AC CHECKS GOOD. CONTINUITY CHECKS OF THE M2675 COIL CORD CHECKS GOOD, REF B737-800 WDM 30-41-12. REMOVED AND REPLACED LT OPENABLE WINDOW, REF B737-800 AMM 56-12-11-400-801. OPERATIONS CHECK GOOD.