# Proposed AD FAA-2008-1245: CFM International S.A. Model CFM56 Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-11-02
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 26, 2008, 73 FR 71951
- Comments due: January 26, 2009
- Became: [AD 2009-11-02](https://openairdocs.org/ad/2009-11-02)
- Docket: FAA-2008-1245 (https://www.regulations.gov/docket/FAA-2008-1245, where comments are filed)
- Project: 2008-NE-27-AD
- FR document: E8-28055
- Official PDF: https://openairdocs.org/files/sha256/19/27/19272d276eeb6d11370cdaa940aed4520f19e4a1c2bf92384ee3f61b5f1fb6d1 (from https://www.govinfo.gov/content/pkg/FR-2008-11-26/pdf/E8-28055.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/11/26/E8-28055/airworthiness-directives-cfm-international-sa-model-cfm56-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/63267A649A2F991A8625750D0051DA2E.0001
- Page: https://openairdocs.org/proposed/FAA-2008-1245

## Summary

The FAA proposes to adopt 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 proposed AD would require removing certain HPC 4-9 spools listed by P/N and SN in this proposed AD. This proposed AD results from reports of certain HPC 4-9 spools that Propulsion Technology LLC (PTLLC) improperly repaired and returned to service. We are proposing 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.

## Notices in this docket

- Nov 26, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-28055, comments due Jan 26, 2009 (https://www.federalregister.gov/documents/2008/11/26/E8-28055/airworthiness-directives-cfm-international-sa-model-cfm56-turbofan-engines)

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