SDR ASAA2017051020714

Service difficulty report · Circuit Breaker · Boeing 737990ER

Difficulty date: May 10, 2017
Submitted: May 12, 2017
Operation: Air carrier
Aircraft: N471AS
Make and model: Boeing 737990ER
Aircraft serial: 41703
Aircraft time: 10,360 hours, 3,448 cycles
System (JASC): 3040 · Windshield/Door Rain/Ice Removal
Part: Circuit Breaker
Condition: Pulled
Location: Window Heat
Stage of operation: NR
How discovered: O
Nature of condition: W, J
Precautionary procedure: O

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

What was found

L1 WINDOW OVERHEATED. COOLED WINDOW FOR 5 MINUTES AND TURNED WINDOW HEAT SWITCH BACK ON, OVERHEAT LIGHT CAME BACK ON. TURNED WINDOW HEAT SWITCH OFF FOR REMAINDER OF FLIGHT. ACFT GROUNDED. VISUALLY INSPECTED L1 WINDOW FOR DAMAGE IAW AMM 56-11-00. NO DEFECTS NOTED. FOUND CIRCUIT BREAKER FOR THE LT WINDSHIELD OUT. RESET THE CIRCUIT BREAKER IAW AMM 20-60-01. NO DEFECTS NOTED. PERFORMED WINDOW HEAT CONTROL UNIT SYSTEM TEST IAW AMM 30-41-11. NO DEFECTS NOTED. OPS CHECKED NORMAL.