Service difficulty report · Window · Boeing 777222

Difficulty date
October 10, 2000
Submitted
November 14, 2000
Operation
Air carrier
Aircraft
N204UA
Make and model
Boeing 777222
Aircraft serial
28713
Aircraft time
7,879 hours, 1,191 cycles
Engine
Pwa PW4090
Part
Window
Part number
141W74002
Part serial
98243H5843
Condition
Failed
Location
Cockpit
Part time
7,879 hours, 1,191 cycles
Stage of operation
CR
How discovered
O
Nature of condition
O
Precautionary procedure
A

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

What was found

WINDSHIELD AT 1R SHATTERED. DIVERTED DEN. *S/D* UAL COMPONENT ENGINEER EVALUATED DISCREPANT WINDOW IN THE SHOP. THE UPPER INNER BUS BAR (ANTI-FOG LAYER) WAS SEVERELY DETERIORATED ALONG THE FORWARD EDGE WHERE EVIDENCE OF DELAMINATION ALONG THE STRUCTURAL PLIES WERE NOTED. THE INNER PLY DELAMINATION WAS NOTED TO BE APPROX AT ITS GREATEST DIMENSION (15 INCHES X 2.5 INCHES). RESISTANCE OF THE BUS BARS WERE MEASURED WITH UPPER BUS BAR RESISTANCE BEING GREATER THAN ALLOWED AT 34 OHMS. THE EXACT CAUSE OF THE CRACK IS UNKNOWN. THE WINDOW WILL BE SENT TO PPG FOR FURTHER EVALUATION AND CORRECTIVE ACTION.