# Airworthiness Directives; GE Aviation Czech s.r.o. Turboprop Engines
> **Rule** · Final rule. · Published 2018-02-14 · Effective 2018-03-21 · 83 FR 6455
## Document
- **Document number:** 2018-02994
- **Category:** airworthiness
- **Manufacturer:** GE Aviation Czech s.r.o. Turboprop
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 6455
- **Publication date:** 2018-02-14
- **Effective date:** 2018-03-21
- **FAA docket:** Docket No. FAA-2017-0658
## Abstract

We are adopting a new airworthiness directive (AD) for GE Aviation Czech s.r.o. M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E- 11S, and M601F turboprop engines. This AD requires removal of certain power turbine (PT) disks installed on the affected engines. This AD was prompted by a design review by the manufacturer that determined PT rotors with certain disks have less overspeed margin than originally stated during product certification. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/02/14/2018-02994/airworthiness-directives-ge-aviation-czech-sro-turboprop-engines)
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