# Airworthiness Directives; CFM International, S.A. Engines
> **Rule** · Final rule. · Published 2023-12-11 · Effective 2024-01-16 · 88 FR 85836
## Document
- **Document number:** 2023-27092
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 88 FR 85836
- **Publication date:** 2023-12-11
- **Effective date:** 2024-01-16
- **FAA docket:** Docket No. FAA-2023-1216
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all CFM International, S.A. (CFM) Model LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP- 1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 (LEAP-1B) engines. This AD was prompted by a manufacturer investigation that revealed that certain high-pressure turbine (HPT) rotor stage 1 disks (HPT stage 1 disks) and a certain compressor rotor stages 6-10 spool were manufactured from material suspected to have reduced material properties due to iron inclusion. This AD requires replacing certain HPT stage 1 disks and a certain compressor rotor stages 6-10 spool. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/12/11/2023-27092/airworthiness-directives-cfm-international-sa-engines)
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