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.
Entire read
http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/(LookupSAIBs)/NE-14-13?OpenDocument
.
.
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.
Entire read
http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/(LookupSAIBs)/NE-14-13?OpenDocument
