Service difficulty report · Controller · Boeing 737824

Difficulty date
June 17, 2025
Submitted
June 19, 2025
Operation
Air carrier
Aircraft
N77537
Make and model
Boeing 737824
Aircraft serial
62767
Aircraft time
27,425 hours, 10,120 cycles
Part
Controller
Part number
8300027904
Part serial
04694
Condition
Faulted
Location
Window Heat
Part time
7,049 hours, 2,510 cycles
Stage of operation
IN
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

WINDOW HEAT OVERHEAT LIGHT LIGHT ON L FWD R FWD WINDOW HEAT OVT LIGHT ON. SMELLED ELECTRICAL SMELL TURNED OFF. SMELL GONE ON PILOT DEBRIEF CONFIRMED ONLY CAPT WINDSHIELD OVERHEAT. ELEC SMELL DISSAPATED QUICK AFTER TURNING OFF. GIVING CREW FORM 46-6020 SMOKE IN CABIN. PERFORMED BITE FOR OVERHEAT FWD CAP ON WHCU M00321 FOUND LIGHT SENSOR 1 ON, REFER FIM 30-41 TASK 801. INSPECTED WINDOW FOR SIGNS OF OVERHEAT DAMAGE FOUND NONE. PUT WHCU M00321 IN OVERRIDE MODE FOR SENSOR 1 TRANSFER TO SENSOR 2, SWITCHED ON FWD CAP WINDOW HEAT NO HELP OVERHEAT LIGHT ON REFER AMM 30-41-11-440-801 PUT WHCU 321 BACK TO NORMAL MODE. T/S PURPOSES SWAPPED WHCU M00321 AND M00323 FAULT FOLLOWED BOX AND THE R FWD OVERHEAT LIGHT ILLUMINATED AND L FWD LIGHT NORMAL. SWAPPED BACK TO NORMAL CONFIG REMOVED AND REPLACED WHCU REFER AMM 30-41-11-000/400 OPS CHECK NORMAL NO OVERHEAT LIGHT ON HEATS GOOD NO SMELL IN F/D GOOD TO CONTINUE.PARTS USED: 29-3041-9-0004, QTY :1 ROTABLE PARTS CHG:TT # 1452922 SN OFF 4694 PN OFF 29-3041-9-0004.CONTROLLER, ASS OFF 29-3041-9-0004 4694 ON 29-3041-9-0004 7130