SDR ASAA2023041842919

Service difficulty report · Control Unit · Boeing 737890

Difficulty date: April 18, 2023
Submitted: April 24, 2023
Operation: Air carrier
Aircraft: N586AS
Make and model: Boeing 737890
Aircraft serial: 35189
Aircraft time: 55,406 hours, 16,588 cycles
System (JASC): 3040 · Windshield/Door Rain/Ice Removal
Part: Control Unit
Part number: 8300005604
Part serial: 9674D
Condition: Faulty
Location: E/E Rack E4-2
Part time: 55,433 hours, 16,602 cycles
Stage of operation: CL
How discovered: V
Nature of condition: J
Precautionary procedure: K

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

What was found

L2 WINDOW OVHT LIGHT CAME ON DURING CLIMB. FOLLOWED QRH, LIGHT CAME BACK ON, NOTED AFTER LANDING, WINDOW HEAT PWR CB POPPED. GROUNDED - YES. REMOVED AND REPLACED M322 WHCU LEFT SIDE, OPS NML REF B737-800 AMM 30-41-11-400-801. ACCOMPLISHED WINDOW HEAT CONTROL UNIT SYSTEM TEST, OPS NML REF AMM 30-41-11-710-801.