Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain Lycoming Engines (formerly Textron Lycoming) 360 and 540 series reciprocating engines with ECi connecting rods, part number (P/ N) AEL 11750, installed. This proposed AD would require replacing certain serial-numbered connecting rods, P/N AEL 11750. This proposed AD would also prohibit installing certain ECi connecting rods, P/N AEL 11750 into any Lycoming 360 or 540 series reciprocating engines. This proposed AD results from reports of connecting rods with excessive variation in circularity of the journal bores. We are proposing this AD to prevent fatigue failure of the connecting rod and uncommanded shutdown of the engine.