# Airworthiness Directives; General Electric Company CT64-820-4 Turboprop Engines
> **Rule** · Final rule; request for comments. · Published 2005-06-21 · Effective 2005-07-06 · 70 FR 35523
## Document
- **Document number:** 05-12173
- **Category:** airworthiness
- **Manufacturer:** General Electric Company CT64-820-4 Turboprop
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 35523
- **Publication date:** 2005-06-21
- **Effective date:** 2005-07-06
- **FAA docket:** Docket No. FAA-2005-21586
## Abstract

The FAA is adopting a new airworthiness directive (AD) for General Electric Company (GE) CT64-820-4 turboprop engines with stage 1 turbine disk and shaft, part number (P/N) 6004T47P03 or 4921T10P02 installed. This AD requires removing from service these stage 1 turbine disk and shafts at reduced compliance times. This AD results from the discovery by the manufacturer of low-cycle-fatigue (LCF) cracks found in stage 1 turbine disk and shafts, P/Ns 6004T47P03 and 4921T10P02. We are issuing this AD to prevent uncontained failure of the stage 1 turbine disk and shaft, resulting in damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/06/21/05-12173/airworthiness-directives-general-electric-company-ct64-820-4-turboprop-engines)
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