# Proposed AD FAA-2006-24261: General Electric Company Aircraft Engines (GEAE) CT7-8A Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-06-51
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 19, 2008, 73 FR 14731
- Comments due: May 19, 2008
- Became: [AD 2006-06-51](https://openairdocs.org/ad/2006-06-51)
- Docket: FAA-2006-24261 (https://www.regulations.gov/docket/FAA-2006-24261, where comments are filed)
- Project: 2006-NE-12-AD
- FR document: E8-5492
- Official PDF: https://openairdocs.org/files/sha256/00/8a/008a15fab101548ec15996a4b7a75199f3d282b07d09041968736d26ed79f818 (from https://www.govinfo.gov/content/pkg/FR-2008-03-19/pdf/E8-5492.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/03/19/E8-5492/airworthiness-directives-general-electric-company-aircraft-engines-geae-ct7-8a-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/80A51F340749EBB486257411005A9B11.0001
- Page: https://openairdocs.org/proposed/FAA-2006-24261

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) for certain GEAE CT7-8A turboshaft engines. That AD currently requires initial and repetitive inspections of the electrical chip detectors for the No. 3 bearing. This proposed AD would require removing certain GEAE CT7-8A turboshaft engines within 6,200 cycles- since-new. This proposed AD results from investigation for the root causes of two failures of the No. 3 bearing. We are proposing this AD to prevent failure of the No. 3 bearing due to contamination by Aluminum Oxide, which could result in a possible dual in-flight shutdown of the engines.

## Notices in this docket

- Mar 19, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-5492, comments due May 19, 2008 (https://www.federalregister.gov/documents/2008/03/19/E8-5492/airworthiness-directives-general-electric-company-aircraft-engines-geae-ct7-8a-turboshaft-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.