# Airworthiness Directives; General Electric Company (GE) CT7-8A Turboshaft Engines
> **Rule** · Final rule. · Published 2008-12-22 · Effective 2009-01-26 · 73 FR 78175
## Document
- **Document number:** E8-29722
- **Category:** airworthiness
- **Manufacturer:** General Electric Company (GE) CT7-8A Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 73 FR 78175
- **Publication date:** 2008-12-22
- **Effective date:** 2009-01-26
- **FAA docket:** Docket No. FAA-2006-24261
## Abstract

The FAA is superseding an existing airworthiness directive (AD) for certain GE CT7-8A turboshaft engines. That AD currently requires initial and repetitive inspections of the electrical chip detectors for the No. 3 bearing. This AD requires removing from service certain GE CT7-8A turboshaft engines within 6,200 cycles-since-new. This AD results from investigation for the root causes of two failures of the No. 3 bearing. We are issuing this AD to prevent failure of the No. 3 bearing due to contamination by aluminum oxide, which could result in a possible in-flight shutdown of the engines and loss of control or forced landing of the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/12/22/E8-29722/airworthiness-directives-general-electric-company-ge-ct7-8a-turboshaft-engines)
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