# Airworthiness Directives; CFM International (CFMI) CFM56-2, -2B, -3, -5B, -5C and -7B Series Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2001-06-01 · Effective 2001-06-11 · 66 FR 29689
## Document
- **Document number:** 01-13720
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 29689
- **Publication date:** 2001-06-01
- **Effective date:** 2001-06-11
- **FAA docket:** Docket No. 2001-NE-18-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to CFMI CFM56-2, -2B, -3, -5B, -5C and -7B series turbofan engines. This action requires limiting engines with certain No. 4 bearings to one on each airplane, replacement of certain No. 4 bearings, and increased frequency of inspections for magnetic particles until the suspect bearing is replaced. This action is prompted by reports of two bearing failures in the fleet since December 2000. The actions specified in this AD are intended to prevent bearing failures, which could cause an engine failure.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/06/01/01-13720/airworthiness-directives-cfm-international-cfmi-cfm56-2--2b--3--5b--5c-and--7b-series-turbofan)
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