# Airworthiness Directives; CFM International, S.A. CFM56-5, -5B, and -7B Series Turbofan Engines
> **Rule** · Final rule. · Published 2010-06-21 · Effective 2010-07-26 · 75 FR 34924
## Document
- **Document number:** 2010-14819
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 75 FR 34924
- **Publication date:** 2010-06-21
- **Effective date:** 2010-07-26
- **FAA docket:** Docket No. FAA-2010-0026
## Abstract

The FAA is adopting a new airworthiness directive (AD) for CFM International, S.A. CFM56-5, -5B, and -7B series turbofan engines. This AD requires removing from service, nine stage 3 low-pressure turbine (LPT) disks, identified by serial number (S/N). This AD results from the discovery of a material nonconformity requiring removal of the disk before the certified disk life of certain stage 3 LPT disks. We are issuing this AD to prevent uncontained failure of the stage 3 LPT disk and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/06/21/2010-14819/airworthiness-directives-cfm-international-sa-cfm56-5--5b-and--7b-series-turbofan-engines)
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