# Proposed AD FAA-2008-1206: General Electric Co. (GE) CF6-80A Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-07-10
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 14, 2008, 73 FR 67433
- Comments due: January 13, 2009
- Became: [AD 2009-07-10](https://openairdocs.org/ad/2009-07-10)
- Docket: FAA-2008-1206 (https://www.regulations.gov/docket/FAA-2008-1206, where comments are filed)
- Project: 2008-NE-19-AD
- FR document: E8-27080
- Official PDF: https://openairdocs.org/files/sha256/5d/37/5d3768af44a704900377d54e54f0715675f4995564d7b4cde791393d9499e13e (from https://www.govinfo.gov/content/pkg/FR-2008-11-14/pdf/E8-27080.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/11/14/E8-27080/airworthiness-directives-general-electric-co-ge-cf6-80a-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8CE3D80011A405E98625750100754E38.0001
- Page: https://openairdocs.org/proposed/FAA-2008-1206

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for GE CF6-80A series turbofan engines with a high-pressure turbine rotor (HPTR) stage 1 disk, part number (P/N) 9367M45G06, installed. This proposed AD would require removing any HPTR stage 1 disk, P/N 9367M45G06, before exceeding 2,075 cycles-since-new (CSN). This proposed AD results from an error by GE that incorrectly cited a cyclic life of 12,600 CSN for the HPTR stage 1 disk, P/N 9367M45G06. We are proposing this AD to prevent the HPTR stage 1 disk from exceeding its part life which could cause fatigue cracks to start and grow. These cracks could result in a possible uncontained disk failure and damage to the airplane.

## Notices in this docket

- Nov 14, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-27080, comments due Jan 13, 2009 (https://www.federalregister.gov/documents/2008/11/14/E8-27080/airworthiness-directives-general-electric-co-ge-cf6-80a-series-turbofan-engines)

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