Superseding AD Proposed for Lycoming Oil Inspections and Connecting Rod Bushings

The FAA has proposed to supersede AD 2024-21-02 (current AD), which applies to Lycoming engines that have certain connecting rod assemblies installed. 

The current AD requires repetitive oil inspections for bronze metal particulates and, if found, additional inspections of the connecting rod bushings for damage, proper fit, movement, and wear, and replacement if necessary. As terminating action to the connecting rod bushing inspections, replacement of the connecting rod bushings with parts eligible for installation is required. 

Since the current AD was issued, the ship date range for potentially affected parts that may be subject to the connecting rod failure has been expanded (current AD: 30-Jan-2009 to 14-Feb-2017, proposed AD: 30-Jan-2009 to 9-Sep-2021). Additional parts that are eligible for installation have also been identified. This proposed AD would require the actions in the current AD and would require expanding the applicability. 

You can view the proposed AD here. Comments are due September 22, 2025.