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A B737-300 returned to the departure airport due to short in left #1 window bus bar terminal. First flight after window replacement.
| Attributes | |
| ACN | 714786 |
| Time | |
| Date | 200610 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 714786 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | other |
| Consequence | other other other |
| Factors | |
| Maintenance | performance deficiency : inspection performance deficiency : testing |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance Environmental Factor Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
On oct/tue/06 right&right (removed and replaced) L1 window. Remove two black rubber washers in upper l-hand beside tab. Reinstalled same washers in same place when reinstalled window. On first flight of day window shorted out at 2 black washers causing air turn back. Per maintenance manual; it talks about the black o-rings calling them black ethylene propylene seal washers. Callback conversation with reporter revealed the following information: the black ethylene propylene washers were removed from the defective window and used again on the replacement window bus bar terminal strip. The black washers do not show on the window replacement maintenance manual procedure. The use of these washers was optional and were originally used by contract maintenance on the removed window. Reporter stated the washers must have shorted out causing the sparks and smoke resulting a return to the departure airport.
Original NASA ASRS Text
Title: A B737-300 RETURNED TO THE DEP ARPT DUE TO SHORT IN L #1 WINDOW BUS BAR TERMINAL. FIRST FLT AFTER WINDOW REPLACEMENT.
Narrative: ON OCT/TUE/06 R&R (REMOVED AND REPLACED) L1 WINDOW. REMOVE TWO BLACK RUBBER WASHERS IN UPPER L-HAND BESIDE TAB. REINSTALLED SAME WASHERS IN SAME PLACE WHEN REINSTALLED WINDOW. ON FIRST FLT OF DAY WINDOW SHORTED OUT AT 2 BLACK WASHERS CAUSING AIR TURN BACK. PER MAINT MANUAL; IT TALKS ABOUT THE BLACK O-RINGS CALLING THEM BLACK ETHYLENE PROPYLENE SEAL WASHERS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE BLACK ETHYLENE PROPYLENE WASHERS WERE REMOVED FROM THE DEFECTIVE WINDOW AND USED AGAIN ON THE REPLACEMENT WINDOW BUS BAR TERMINAL STRIP. THE BLACK WASHERS DO NOT SHOW ON THE WINDOW REPLACEMENT MAINT MANUAL PROC. THE USE OF THESE WASHERS WAS OPTIONAL AND WERE ORIGINALLY USED BY CONTRACT MAINT ON THE REMOVED WINDOW. RPTR STATED THE WASHERS MUST HAVE SHORTED OUT CAUSING THE SPARKS AND SMOKE RESULTING A RETURN TO THE DEP ARPT.
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.