# Airworthiness Directives; CFM International, S.A. Turbofan Engines
> **Rule** · Final rule. · Published 2012-02-09 · Effective 2012-03-15 · 77 FR 6666
## Document
- **Document number:** 2012-2893
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 6666
- **Publication date:** 2012-02-09
- **Effective date:** 2012-03-15
- **FAA docket:** Docket No. FAA-2011-0946
## Abstract

We are adopting a new airworthiness directive (AD) for certain CFM International, S.A. model CFM56-5B series turbofan engines. This AD was prompted by a normal quality sampling at CFM International, S.A. that isolated a production batch of fan blades with nonconforming geometry of mid-span shroud tips of the fan blades. This AD requires removing from service certain serial number (S/N) fan blades. We are issuing this AD to prevent an inflight shutdown (IFSD) of one or more engines following foreign object damage (FOD) or a bird strike.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/02/09/2012-2893/airworthiness-directives-cfm-international-sa-turbofan-engines)
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