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B777 first officer's windscreen failed during cruise. Emergency declared and flight diverted to nearest suitable airport.
| Attributes | |
| ACN | 746558 |
| Time | |
| Date | 200707 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 39000 |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 746558 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : diverted to another airport flight crew : declared emergency flight crew : landed in emergency condition |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Approximately 250 miles northeast of ZZZ first officer's forward windscreen failed; ie; bonding material between inner and outer pane began to burn in an approximately 12 inch l-shape in upper right corner. Then we watched as a second line burned down from the top of the windscreen approximately 7 inches in the center. We declared an emergency; descended to a lower altitude; jettsoned fuel down to maximum landing weight. Landing at ZZZ was uneventful. No further deterioration to window observed.
Original NASA ASRS Text
Title: B777 FO'S WINDSCREEN FAILED DURING CRUISE. EMER DECLARED AND FLT DIVERTED TO NEAREST SUITABLE ARPT.
Narrative: APPROX 250 MILES NE OF ZZZ FO'S FORWARD WINDSCREEN FAILED; IE; BONDING MATERIAL BETWEEN INNER AND OUTER PANE BEGAN TO BURN IN AN APPROX 12 INCH L-SHAPE IN UPPER RIGHT CORNER. THEN WE WATCHED AS A SECOND LINE BURNED DOWN FROM THE TOP OF THE WINDSCREEN APPROX 7 INCHES IN THE CENTER. WE DECLARED AN EMER; DESCENDED TO A LOWER ALT; JETTSONED FUEL DOWN TO MAX LNDG WT. LNDG AT ZZZ WAS UNEVENTFUL. NO FURTHER DETERIORATION TO WINDOW OBSERVED.
Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.