AC 33-6, ADVISORY CIRCULAR: WELD REPAIR OF ALUMINUM CRANKCASES AND CYLINDERS OF PISTON ENGINES (20 DEC 1994

AC 33-6, ADVISORY CIRCULAR: WELD REPAIR OF ALUMINUM CRANKCASES AND CYLINDERS OF PISTON ENGINES (20 DEC 1994)., This advisory circular provides guidelines for the development of repair procedures for weld repairs on crankcases and cylinders of piston engines. It addresses development of weld repairs which are not contained in the engine manufacturer's "Instructions for Continued Airworthiness" (Maintenance Manual). It provides guidance to clarify the areas which should be addressed by an applicant's repair procedure, and/or substantiating data when seeking an approval for weld repair on crankcases or cylinders. This advisory circular also includes information on critical areas of welding, qualifications of welder's, inspection techniques, the thermal processes, and technical data required. This advisory circular references industry and military specifications which are acceptable for use by repair stations as approved data.