SDR UALA2011052002494

Service difficulty report · Switch · Boeing 777222

Difficulty date: May 19, 2011
Submitted: June 13, 2011
Operation: Air carrier
Aircraft: N224UA
Make and model: Boeing 777222
Aircraft serial: 30225
Aircraft time: 38,296 hours, 4,681 cycles
Engine: Pwa PW40903
System (JASC): 3040 · Windshield/Door Rain/Ice Removal
Part: Switch
Condition: Malfunctioned
Location: Window Heat
Stage of operation: NR
How discovered: O
Nature of condition: O
Precautionary procedure: O

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

What was found

WINDOW HEAT L SIDE FAILURE OF LEFT NR 2 SIDE WINDSHIELD HEATING CIRCUIT (LOSS OF WINDOW COATING, WIRING OR THE INDIVIDUAL WHCU CIRCUIT FOR THAT WINDOW). FOUND WINDOW HEAT SIDE SWITCH INDICATING 'INOP' WITH SWITCH TURNED ON. CYCLED SW SEVERAL TIMES. REPLACED WINDOW HEAT SIDE KORRY SW BODY AND CAP. AGAIN CYCLED SWITCH 7 TIMES SWITCH FOLLOWED COMMAND. ALSO, PERFORMED MAT TEST. TEST PASSED. NO ACTIVE MSG'S.