# Airworthiness Directives; General Electric Company Turboshaft Engines
> **Rule** · Final rule. · Published 2017-09-22 · Effective 2017-10-27 · 82 FR 44299
## Document
- **Document number:** 2017-19961
- **Category:** airworthiness
- **Manufacturer:** General Electric Company Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 44299
- **Publication date:** 2017-09-22
- **Effective date:** 2017-10-27
- **FAA docket:** Docket No. FAA-2017-0452
## Abstract

We are adopting a new airworthiness directive (AD) for certain General Electric Company (GE) CT7-8A and CT7-9B model turboshaft engines. This AD was prompted by reports from the manufacturer that the high-pressure compressor (HPC) impeller installed on these engines may have suffered from material degradation during the manufacturing process. This AD requires removal of the affected HPC impellers. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/09/22/2017-19961/airworthiness-directives-general-electric-company-turboshaft-engines)
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