Airworthiness Directives; Lycoming Engines
Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register Nov. 9, 2026. Document 2026-22785. Updated Nov. 9, 2026.
- What it does
The FAA is superseding Airworthiness Directive (AD) 2026-17- 10, which applied to Lycoming Engines (Lycoming) Model O-235, O-540, and IO-540 engines with a certain piston pin installed. AD 2026-17-10 required replacement of the affected piston pin with a part eligible for installation and, for certain engines, oil change and visual inspection of the engine oil filter, oil pressure screen, and oil suction screen for metal particulates. AD 2026-17-10 also prohibited the installation of an affected piston pin on any engine. Since the FAA issued AD 2026-17-10, the manufacturer has identified additional Lycoming Model engines that are subject to the unsafe condition, and the FAA determined the need to clarify the definition for an "affected piston pin," and include corrective action for engine models that were not listed in the manufacturer's service material. This AD requires replacement of the affected piston pin with a part eligible for installation and, for certain engines, oil change and visual inspection of the engine oil filter, oil pressure screen, and oil suction screen for metal particulates. This AD also prohibits the installation of an affected piston pin on any engine. This AD also expands the applicability to include additional affected engines with a certain piston pin installed. The FAA is issuing this AD to address the unsafe condition on these products.
The Federal Aviation Administration's summary, as published in the Federal Register.
- What changed in the regulation
1 part of Title 14 of the Code of Federal Regulations:
- Compared with
The Federal Aviation Administration has published 482 final rules in 2026 so far, compared with 518 in all of 2025.
Counted by the Tribune from Federal Register records since Jan. 1, 2025.
- Before this
1094 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.
- Nov. 9, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Nov. 9, 2026 Final rule. Airworthiness Directives; Airbus Helicopters
- Nov. 9, 2026 Final rule. Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
- Nov. 9, 2026 Final rule. Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines
- Nov. 6, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Nov. 6, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Dassault Aviation Airplanes
- Nov. 5, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Nov. 5, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Costruzioni Aeronautiche Tecnam S.P.A. Airplanes
- What happens next and when
This AD is effective November 24, 2026.
The agency's dates, word for word.
- Check it yourself
The record as published
| Document number | 2026-22785 |
|---|---|
| Action | Final rule; request for comments. |
| Agencies | Transportation Department; Federal Aviation Administration |
| Published | Nov. 9, 2026 |
| Effective date | Nov. 24, 2026 |
| Regulation identifier (RIN) | 2120-AA64 |
| Docket | FAA-2026-13797 |
Source: the Federal Register (public domain). The document in the Federal Register