# Proposed AD 2003-NE-67-AD: GE Aircraft Engines (GE) CF34-3A, CF34-3A2, CF34-1A, CF34-3A1, CF34-3B, and CF34-3B1 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-26-02
- Products: GE Aircraft Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 18, 2004, 69 FR 28093
- Comments due: July 19, 2004
- Became: [AD 2004-26-02](https://openairdocs.org/ad/2004-26-02)
- Docket: 2003-NE-67-AD
- FR document: 04-11199
- Official PDF: https://openairdocs.org/files/sha256/1e/c2/1ec2d1e33a7ce6dac9e06463c8f423f8a20c166db3daf450021036f5e2795512 (from https://www.govinfo.gov/content/pkg/FR-2004-05-18/pdf/04-11199.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/05/18/04-11199/airworthiness-directives-ge-aircraft-engines-ge-cf34-3a-cf34-3a2-cf34-1a-cf34-3a1-cf34-3b-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A9F1D2AB57F94B4986256E9800580174.0001
- Page: https://openairdocs.org/proposed/2003-NE-67-AD

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for GE CF34-3A, CF34-3A2, CF34-1A, CF34-3A1, CF34-3B, and CF34-3B1 series turbofan engines. This proposed AD would require removal from service of certain high pressure compressor (HPC) forward spools, at the first piece-part level exposure after 6,000 cycles since new (CSN), but not later than 20,000 CSN for CF34-3B engines and 22,000 CSN for CF34-3A, CF34-3A2, CF34-1A, CF34-3A1, and CF34-3B1 engines. This proposed AD results from an updated low-cycle fatigue (LCF) analysis performed on certain HPC forward spools. We are proposing this AD to prevent LCF cracks and failure of the HPC forward spool, which could result in an uncontained engine failure and damage to the airplane.

## Notices in this docket

- May 18, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-11199, comments due Jul 19, 2004 (https://www.federalregister.gov/documents/2004/05/18/04-11199/airworthiness-directives-ge-aircraft-engines-ge-cf34-3a-cf34-3a2-cf34-1a-cf34-3a1-cf34-3b-and)

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