# Airworthiness Directives; CFM International S.A. Model CFM56 Turbofan Engines
> **Rule** · Final rule. · Published 2009-05-19 · Effective 2009-06-23 · 74 FR 23305
## Document
- **Document number:** E9-11554
- **Category:** airworthiness
- **Manufacturer:** CFM International S.A. Model CFM56 Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 74 FR 23305
- **Publication date:** 2009-05-19
- **Effective date:** 2009-06-23
- **FAA docket:** Docket No. FAA-2008-1245
## Abstract

The FAA is adopting a new airworthiness directive (AD) for CFM International S.A. CFM56-2, CFM56-3, CFM56-5A, CFM56-5B, CFM56-5C, and CFM56-7B series turbofan engines with certain part number (P/N) and serial number (SN) high-pressure compressor (HPC) 4-9 spools installed. This AD requires removing certain HPC 4-9 spools listed by P/N and SN in this AD. This AD results from reports of certain HPC 4-9 spools that Propulsion Technology LLC (PTLLC) improperly repaired and returned to service. We are issuing this AD to prevent cracking of the HPC 4-9 spool, which could result in possible uncontained failure of the spool and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/05/19/E9-11554/airworthiness-directives-cfm-international-sa-model-cfm56-turbofan-engines)
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