# Airworthiness Directives; CFM International (CFMI) CFM56-5C Series Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2004-09-09 · Effective 2004-10-14 · 69 FR 54557
## Document
- **Document number:** 04-20411
- **Category:** airworthiness
- **Manufacturer:** CFM International (CFMI) CFM56-5C Series Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 69 FR 54557
- **Publication date:** 2004-09-09
- **Effective date:** 2004-10-14
- **FAA docket:** Docket No. 95-ANE-64-AD
## Abstract

This amendment revises an existing airworthiness directive (AD) for CFMI CFM56-5C series turbofan engines. That AD currently establishes new life limits for certain high pressure turbine rotor (HPTR) front shafts, HPTR front air seals, and booster spools. This action removes the booster spool, part number (P/N) 337-005-210-0, and the HPTR front shaft, P/Ns 1498M40P03, 1498M40P05, and 1498M40P06, from the parts listed with lowered life limits in the existing AD. This amendment results from a life management review completed by the manufacturer. We are issuing this AD to prevent low-cycle fatigue (LCF) failure of certain HPTR front air seals, which could result in an uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/09/09/04-20411/airworthiness-directives-cfm-international-cfmi-cfm56-5c-series-turbofan-engines)
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