# Airworthiness Directives; CFM International, S.A. Engines
> **Rule** · Final rule. · Published 2025-02-04 · Effective 2025-03-11 · 90 FR 8889
## Document
- **Document number:** 2025-02204
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 90 FR 8889
- **Publication date:** 2025-02-04
- **Effective date:** 2025-03-11
- **FAA docket:** Docket No. FAA-2024-2325
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model LEAP-1A and LEAP-1C engines. This AD was prompted by an investigation of an in-flight shut down event that revealed the aft arm of the high-pressure turbine (HPT) rotor interstage seal had failed. This AD requires removal from service and replacement of the HPT rotor interstage seal for LEAP-1A engines. Since the HPT rotor interstage seal part number is interchangeable between LEAP-1A and LEAP-1C engines, this AD also prohibits installation of these affected parts onto any LEAP-1A or LEAP-1C engine. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/02/04/2025-02204/airworthiness-directives-cfm-international-sa-engines)
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