# Airworthiness Directives; CFM International CFM56-3, -3B, and -3C Series Turbofan Engines
> **Rule** · Final rule. · Published 1997-04-22 · Effective 1997-06-23 · 62 FR 19483
## Document
- **Document number:** 97-10357
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 62 FR 19483
- **Publication date:** 1997-04-22
- **Effective date:** 1997-06-23
- **FAA docket:** Docket No. 95-ANE-44
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to CFM International CFM56-3, -3B, -3C series turbofan engines, that requires a reduction of the low cycle fatigue (LCF) retirement lives for certain fan disks. This amendment is prompted by the results of a refined life analysis performed by the manufacturer which revealed minimum calculated LCF lives significantly lower than published LCF retirement lives. The actions specified by this AD are intended to prevent a LCF failure of the fan disk, which could result in an uncontained engine failure and damage to the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/04/22/97-10357/airworthiness-directives-cfm-international-cfm56-3--3b-and--3c-series-turbofan-engines)
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