# Airworthiness Directives; CFM International S.A. Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2018-05-23 · Effective 2018-06-07 · 83 FR 23794
## Document
- **Document number:** 2018-11027
- **Category:** airworthiness
- **Manufacturer:** CFM International S.A. Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 83 FR 23794
- **Publication date:** 2018-05-23
- **Effective date:** 2018-06-07
- **FAA docket:** Docket No. FAA-2018-0429
## Abstract

We are adopting a new airworthiness directive (AD) for CFM International, S.A., (CFM) CFM56-7B model engines. This emergency AD was sent previously to all known U.S. owners and operators of CFM CFM56-7B model engines. This AD requires a one-time ultrasonic inspection (USI) of the concave and convex sides of the fan blade dovetail. This AD was prompted by a recent engine failure due to a fractured fan blade, which resulted in the engine inlet cowl disintegrating and debris penetrating the fuselage, causing a loss of pressurization, and prompting an emergency descent. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/05/23/2018-11027/airworthiness-directives-cfm-international-sa-turbofan-engines)
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