Narrative:

I am a mechanic with air carrier a and included in my job description I perform welded repairs from time to time. Another air carrier (B) a subsidiary of my air carrier who operate beechcraft 1900D aircraft, and who holds a repair station certificate for beechcraft 1900D aircraft. On jun/xx/96, air carrier B requested that I perform a welded repair to an engine cowling support bracket that was found cracked during a detailed inspection in conjunction with beechcraft service bulletin, revision 7. The service bulletin pertained primarily to the inspection of the engine truss assembly and did not directly cover the cowling support bracket that was welded to the truss. The service bulletin did indicate that the truss assembly was constructed from 4130 chrommoly steel and was weldable in accordance with maintenance manual. The crack was located in the original weld attaching the bracket to the truss and was no longer than 1/4 inch. I removed the painted surface, grooved the crack area, removing part of the original weld, performed the welding using 41-30 alloy steel welding rod, military specification, military-B- 131H. Upon completion of the repair, I requested that an inspector from air carrier a review the repair, which was done, and subsequently I cleared the work order discrepancy and returned the airplane to air carrier B. Air carrier B personnel completed additional paperwork, including an FAA form 337 for the repair. Air carrier B then released the aircraft for return to service. I was notified 9 days later that the welded repair did not have sufficient documentation approving the repair. I am not sure why the maintenance manual would not be acceptable data for the repair of a support bracket since the beech service bulletin refers welding to the maintenance manual. I would appreciate any information that would help me understand what would have been more appropriate or more acceptable repair criteria in this case.

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Original NASA ASRS Text

Title: MECH WELDER ACCOMPLISHED WELD REPAIR PER SVC BULLETIN. MAINT AUDITOR REQUESTED ADDITIONAL DOCUMENTATION.

Narrative: I AM A MECH WITH ACR A AND INCLUDED IN MY JOB DESCRIPTION I PERFORM WELDED REPAIRS FROM TIME TO TIME. ANOTHER ACR (B) A SUBSIDIARY OF MY ACR WHO OPERATE BEECHCRAFT 1900D ACFT, AND WHO HOLDS A REPAIR STATION CERTIFICATE FOR BEECHCRAFT 1900D ACFT. ON JUN/XX/96, ACR B REQUESTED THAT I PERFORM A WELDED REPAIR TO AN ENG COWLING SUPPORT BRACKET THAT WAS FOUND CRACKED DURING A DETAILED INSPECTION IN CONJUNCTION WITH BEECHCRAFT SVC BULLETIN, REVISION 7. THE SVC BULLETIN PERTAINED PRIMARILY TO THE INSPECTION OF THE ENG TRUSS ASSEMBLY AND DID NOT DIRECTLY COVER THE COWLING SUPPORT BRACKET THAT WAS WELDED TO THE TRUSS. THE SVC BULLETIN DID INDICATE THAT THE TRUSS ASSEMBLY WAS CONSTRUCTED FROM 4130 CHROMMOLY STEEL AND WAS WELDABLE IN ACCORDANCE WITH MAINT MANUAL. THE CRACK WAS LOCATED IN THE ORIGINAL WELD ATTACHING THE BRACKET TO THE TRUSS AND WAS NO LONGER THAN 1/4 INCH. I REMOVED THE PAINTED SURFACE, GROOVED THE CRACK AREA, REMOVING PART OF THE ORIGINAL WELD, PERFORMED THE WELDING USING 41-30 ALLOY STEEL WELDING ROD, MIL SPEC, MIL-B- 131H. UPON COMPLETION OF THE REPAIR, I REQUESTED THAT AN INSPECTOR FROM ACR A REVIEW THE REPAIR, WHICH WAS DONE, AND SUBSEQUENTLY I CLRED THE WORK ORDER DISCREPANCY AND RETURNED THE AIRPLANE TO ACR B. ACR B PERSONNEL COMPLETED ADDITIONAL PAPERWORK, INCLUDING AN FAA FORM 337 FOR THE REPAIR. ACR B THEN RELEASED THE ACFT FOR RETURN TO SVC. I WAS NOTIFIED 9 DAYS LATER THAT THE WELDED REPAIR DID NOT HAVE SUFFICIENT DOCUMENTATION APPROVING THE REPAIR. I AM NOT SURE WHY THE MAINT MANUAL WOULD NOT BE ACCEPTABLE DATA FOR THE REPAIR OF A SUPPORT BRACKET SINCE THE BEECH SVC BULLETIN REFERS WELDING TO THE MAINT MANUAL. I WOULD APPRECIATE ANY INFO THAT WOULD HELP ME UNDERSTAND WHAT WOULD HAVE BEEN MORE APPROPRIATE OR MORE ACCEPTABLE REPAIR CRITERIA IN THIS CASE.

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.