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A B757-200 while repairing #4 right service door; shop technicians found 70-80 cherrymax fasteners cracked. Replaced fasteners per the srm. Door repair approved by boeing.
| Attributes | |
| ACN | 685059 |
| Time | |
| Date | 200601 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 685059 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 685060 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : engineering procedure performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication |
| Primary Problem | Aircraft |
| Situations | |
| Publication | Structural Repair Manual |
Narrative:
While assisting with the repairs of aircraft (#4RH) we noticed a large number of cracked cherrymax fasteners (70-80 each). Our company engineering did not respond so we changed the subject fasteners per the B757 srm. Engineer has contacted boeing for further evaluation; door is quarantined until decision from boeing arrives. Callback conversation with reporter revealed the following information: the reporter stated boeing approved the repair accomplished per the srm. The findings on the investigation of the inner skin cracking rivets was a bad batch of rivets used during the door buildup. The reporter said the door inner skin inspections have revealed a large number of cracked rivets and is now an ongoing repair. The inner skin has a total of 500 rivets and is not a pressurized component.
Original NASA ASRS Text
Title: A B757-200 WHILE REPAIRING #4 R SVC DOOR; SHOP TECHNICIANS FOUND 70-80 CHERRYMAX FASTENERS CRACKED. REPLACED FASTENERS PER THE SRM. DOOR REPAIR APPROVED BY BOEING.
Narrative: WHILE ASSISTING WITH THE REPAIRS OF ACFT (#4RH) WE NOTICED A LARGE NUMBER OF CRACKED CHERRYMAX FASTENERS (70-80 EACH). OUR COMPANY ENGINEERING DID NOT RESPOND SO WE CHANGED THE SUBJECT FASTENERS PER THE B757 SRM. ENGINEER HAS CONTACTED BOEING FOR FURTHER EVALUATION; DOOR IS QUARANTINED UNTIL DECISION FROM BOEING ARRIVES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED BOEING APPROVED THE REPAIR ACCOMPLISHED PER THE SRM. THE FINDINGS ON THE INVESTIGATION OF THE INNER SKIN CRACKING RIVETS WAS A BAD BATCH OF RIVETS USED DURING THE DOOR BUILDUP. THE RPTR SAID THE DOOR INNER SKIN INSPECTIONS HAVE REVEALED A LARGE NUMBER OF CRACKED RIVETS AND IS NOW AN ONGOING REPAIR. THE INNER SKIN HAS A TOTAL OF 500 RIVETS AND IS NOT A PRESSURIZED COMPONENT.
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.