# Proposed AD FAA-2005-22124: General Electric Company CF6-45A, CF6- 50A, CF6-50C, and CF6-50E Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-26-06
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 19, 2005, 70 FR 48660
- Comments due: October 18, 2005
- Became: [AD 2005-26-06](https://openairdocs.org/ad/2005-26-06)
- Docket: FAA-2005-22124 (https://www.regulations.gov/docket/FAA-2005-22124, where comments are filed)
- Project: 2005-NE-21-AD
- FR document: 05-16452
- Official PDF: https://openairdocs.org/files/sha256/30/e7/30e7fb11cea49192d5f8478117cd9bf8379b720defd8860fa3294bc05da284b2 (from https://www.govinfo.gov/content/pkg/FR-2005-08-19/pdf/05-16452.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/08/19/05-16452/airworthiness-directives-general-electric-company-cf6-45a-cf6-50a-cf6-50c-and-cf6-50e-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/07CE73D5518684678625706200503775.0001
- Page: https://openairdocs.org/proposed/FAA-2005-22124

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for General Electric Company (GE) CF6-45A, CF6-50A, CF6-50C, and CF6- 50E series turbofan engines. This proposed AD would require removing from service pre-GE Service Bulletin (SB) No. CF6-50 S/B 72-1268 configuration low pressure turbine (LPT) stage 2 interstage seal assemblies and stage 3 interstage seal assemblies. The proposed AD would also require installing new or reworked configuration stage 2 interstage seal assemblies and stage 3 interstage seal assemblies. This proposed AD results from reports of fan mid shaft separation, leading to separation of the LPT stage 1 disk, disk overspeed, and uncontained engine failure. We are proposing this AD to prevent uncontained engine failure and damage to the airplane.

## Notices in this docket

- Aug 19, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-16452, comments due Oct 18, 2005 (https://www.federalregister.gov/documents/2005/08/19/05-16452/airworthiness-directives-general-electric-company-cf6-45a-cf6-50a-cf6-50c-and-cf6-50e-series)

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