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https://www.faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentID/22781
AC 33-6 - Weld Repair of Aluminum Crankcases and Cylinders of Piston Engines - Including Change 1
The Federal Aviation Administration is an operating mode of the U.S. Department of Transportation.
acweldrepairaluminumcrankcases