# Airworthiness Directives; CFM International S.A. Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2019-06-20 · Effective 2019-07-05 · 84 FR 28717
## Document
- **Document number:** 2019-13040
- **Category:** airworthiness
- **Manufacturer:** CFM International S.A. Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 84 FR 28717
- **Publication date:** 2019-06-20
- **Effective date:** 2019-07-05
- **FAA docket:** Docket No. FAA-2019-0212
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain CFM International S.A. (CFM) CFM56-5B, CFM56-5C, and CFM56-7B model turbofan engines with a certain rotating air high-pressure turbine (HPT) front seal. This AD requires replacement of the affected rotating air HPT front seal with a part eligible for installation. This AD was prompted by cracks found in the rotating air HPT front seal. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/06/20/2019-13040/airworthiness-directives-cfm-international-sa-turbofan-engines)
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