AD 2026-04281
Published 2026-03-04 · 1 model · 1 US-registered tails affected · Federal Register
Airworthiness Directives; Lycoming Engines Federal Register ↗
Abstract
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.
Applicability · by US fleet size
- PARKS 3 1 tails
Federal Register text
Verbatim; the Federal Register publication is the legally binding document. Cite: 91 FR 10506. View on Federal Register ↗
[Federal Register Volume 91, Number 42 (Wednesday, March 4, 2026)] [Rules and Regulations] [Pages 10506-10508] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2026-04281]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2025-1365; Project Identifier AD-2024-00684-E; Amendment 39-23271; AD 2026-04-11] RIN 2120-AA64
Airworthiness Directives; Lycoming Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: 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.
DATES: This AD is effective April 8, 2026. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of April 8, 2026.