# Airworthiness Directives; CFM International, S.A. CFM56-7B Series Turbofan Engines
> **Rule** · Final rule. · Published 2010-01-14 · Effective 2010-02-18 · 75 FR 2064
## Document
- **Document number:** E9-31043
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 75 FR 2064
- **Publication date:** 2010-01-14
- **Effective date:** 2010-02-18
- **FAA docket:** Docket No. FAA-2009-0236
## Abstract

The FAA is adopting a new airworthiness directive (AD) for CFM International, S.A. CFM56-7B series turbofan engines. This AD requires initial and repetitive eddy current inspections (ECIs) of certain part number (P/N) low-pressure (LP) turbine rear frames. This AD results from a refined life analysis by the engine manufacturer that shows the need to identify an initial and repetitive inspection threshold for inspecting certain LP turbine rear frames. We are issuing this AD to prevent failure of the LP turbine rear frame from low-cycle-fatigue cracks. Failure of the LP turbine rear frame could result in engine separation from the airplane, possibly leading to loss of control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/01/14/E9-31043/airworthiness-directives-cfm-international-sa-cfm56-7b-series-turbofan-engines)
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