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Flight crew of medium large transport at FL350 noticed a hot spot and delamination of first officer side sliding window. Descended to FL240 and shut off window heat. Proceeded to tpa.
| Attributes | |
| ACN | 167336 |
| Time | |
| Date | 199101 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : tpa |
| State Reference | FL |
| Altitude | msl bound lower : 24000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zjx |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 1500 |
| ASRS Report | 167336 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
En route to dca-tpa at FL350, we noticed a half dollar sized burn mark on the top forward portion of the first officer sliding cockpit window. This window had previously been flawless when we accepted the aircraft earlier in the day. We immediately turned the right side window heat off. We then noticed a delamination rapidly growing from the burn spot. We made an immediate descent to FL240 where the delamination stopped. However, at FL240 the right front window overheat light came on. We also turned the right forward heat off since this system previously had several overheat writeups. We both felt the sliding window would have likely failed had we not descended when we did. We then proceeded to tpa west/O incident. I have to feel that the cause of the window arcing, burning and delaminating had to do with the window heat system repeatedly malfunctioning.
Original NASA ASRS Text
Title: FLT CREW OF MLG AT FL350 NOTICED A HOT SPOT AND DELAMINATION OF FO SIDE SLIDING WINDOW. DESCENDED TO FL240 AND SHUT OFF WINDOW HEAT. PROCEEDED TO TPA.
Narrative: ENRTE TO DCA-TPA AT FL350, WE NOTICED A HALF DOLLAR SIZED BURN MARK ON THE TOP FORWARD PORTION OF THE F/O SLIDING COCKPIT WINDOW. THIS WINDOW HAD PREVIOUSLY BEEN FLAWLESS WHEN WE ACCEPTED THE ACFT EARLIER IN THE DAY. WE IMMEDIATELY TURNED THE RIGHT SIDE WINDOW HEAT OFF. WE THEN NOTICED A DELAMINATION RAPIDLY GROWING FROM THE BURN SPOT. WE MADE AN IMMEDIATE DSNT TO FL240 WHERE THE DELAMINATION STOPPED. HOWEVER, AT FL240 THE RIGHT FRONT WINDOW OVERHEAT LIGHT CAME ON. WE ALSO TURNED THE RIGHT FORWARD HEAT OFF SINCE THIS SYS PREVIOUSLY HAD SEVERAL OVERHEAT WRITEUPS. WE BOTH FELT THE SLIDING WINDOW WOULD HAVE LIKELY FAILED HAD WE NOT DSNDED WHEN WE DID. WE THEN PROCEEDED TO TPA W/O INCIDENT. I HAVE TO FEEL THAT THE CAUSE OF THE WINDOW ARCING, BURNING AND DELAMINATING HAD TO DO WITH THE WINDOW HEAT SYS REPEATEDLY MALFUNCTIONING.
Data retrieved from NASA's ASRS site as of July 2007 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.