# Airworthiness Directives; CFM International S.A. Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2018-11-30 · Effective 2018-12-17 · 83 FR 61529
## Document
- **Document number:** 2018-26026
- **Category:** airworthiness
- **Manufacturer:** CFM International S.A. Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 83 FR 61529
- **Publication date:** 2018-11-30
- **Effective date:** 2018-12-17
- **FAA docket:** Docket No. FAA-2018-0869
## Abstract

We are adopting a new airworthiness directive (AD) for all CFM International S.A. (CFM) LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP- 1B28BBJ1, and LEAP-1B28BBJ2 turbofan engines with a certain high- pressure turbine (HPT) stator case (HPT cases) installed. This AD requires removal of affected HPT cases from service and their replacement with a part eligible for installation. This AD was prompted by the discovery of a quality escape at a manufacturing facility involving unapproved welds on HPT cases. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/11/30/2018-26026/airworthiness-directives-cfm-international-sa-turbofan-engines)
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