# Airworthiness Directives; General Electric Company CT58 Series Turboshaft Engines
> **Rule** · Final rule. · Published 1997-10-20 · Effective 1997-12-19 · 62 FR 54373
## Document
- **Document number:** 97-27351
- **Category:** airworthiness
- **Manufacturer:** General Electric Company CT58 Series Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 62 FR 54373
- **Publication date:** 1997-10-20
- **Effective date:** 1997-12-19
- **FAA docket:** Docket No. 97-ANE-18-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to General Electric Company CT58 series turboshaft engines, that requires removal from service of certain stage 1 and 2 forward cooling plates, and stage 2 aft cooling plates, and replacement with serviceable parts. This amendment is prompted by reports of certain cooling plates forged with contaminated alloy that could reduce the lives of the parts. The actions specified by this AD are intended to prevent cooling plate fracture, which could result in a contained engine failure, and an inflight engine shutdown.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/10/20/97-27351/airworthiness-directives-general-electric-company-ct58-series-turboshaft-engines)
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