This Special Airworthiness Information Bulletin (SAIB) alerts you, owners, operators, and certificated repair facilities of Lycoming Engines of the possible failure of engine thru-studs, and/or cylinder mounting studs.
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Analysis of this failed stud confirmed that it had also failed in high cycle fatigue initiating from a corrosion pit in the thread root. Cadmium plating was not found on the section of the stud inspected, although traces of cadmium plating were present on the ?hold down? nut.
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http://rgl.faa.gov/Regulatory_and_Gu...3?OpenDocument
Check your nuts! SAIB 14-13
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