# Airworthiness Directives; General Electric Company Turboshaft Engines
> **Rule** · Final rule. · Published 2015-10-14 · Effective 2015-11-18 · 80 FR 61720
## Document
- **Document number:** 2015-25719
- **Category:** airworthiness
- **Manufacturer:** General Electric Company Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 61720
- **Publication date:** 2015-10-14
- **Effective date:** 2015-11-18
- **FAA docket:** Docket No. FAA-2008-0808
## Abstract

We are superseding airworthiness directives (AD) 2001-18-06 and AD 2008-22-16, for all General Electric Company (GE) CT58 turboshaft engines. AD 2001-18-06 and AD 2008-22-16 required recalculating the lives of life-limited rotating parts using a repetitive heavy-lift (RHL) multiplying factor and removal from service of parts that exceed the recalculated cyclic or hourly life limit. This new AD would consolidate AD 2001-18-06 and AD 2008-22-16, and further reduce the life capability of certain parts. This AD was prompted by recalculation of life for parts installed on engines used in Utility operations, and a reduced life for compressor spools in all operations. We are issuing this AD to prevent failure of life-limited rotating parts, uncontained part release, damage to the engine, and damage to the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/10/14/2015-25719/airworthiness-directives-general-electric-company-turboshaft-engines)
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