Data / Federal rules / 2026-04281
Airworthiness Directives; Lycoming Engines
The Federal Aviation Administration published this final rule in the Federal Register on March 4, 2026. It took effect on April 8, 2026.
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What the agency says
The FAA is superseding Airworthiness Directive (AD) 2024-21- 02, which applies to Lycoming Engines (Lycoming) model engines that have certain connecting rod assemblies installed. AD 2024-21-02 required 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, AD 2024-21-02 also required replacement of the connecting rod bushings with parts eligible for installation. Since the FAA issued AD 2024-21- 02, the ship date range for potentially affected parts that may be subject to connecting rod failure has been expanded, and additional parts that are eligible for installation have been identified. This AD requires the actions in AD 2024-21-02 and expands the applicability. The FAA is issuing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2026-04281
- Type
- Final rule
- Action
- Final rule
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- March 4, 2026
- Takes effect
- April 8, 2026
- Dates
- This AD is effective April 8, 2026.
- Docket
- Docket No. FAA-2025-1365; Project Identifier AD-2024-00684-E; Amendment 39-23271; AD 2026-04-11
- Regulation ID (RIN)
- 2120-AA64
- Code of Federal Regulations
- 14 CFR 39
- Topics
- Air transportation; Aircraft; Aviation safety; Incorporation by reference; Safety
- Pages
- 3
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Everything from the Federal Aviation Administration · Rules on air transportation · Rules on aircraft · Rules on aviation safety · Published in March 2026
Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.