# Airworthiness Directives; Austro Engine GmbH Engines
> **Rule** · Final rule. · Published 2018-10-25 · Effective 2018-11-29 · 83 FR 53802
## Document
- **Document number:** 2018-23186
- **Category:** airworthiness
- **Manufacturer:** Austro
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 53802
- **Publication date:** 2018-10-25
- **Effective date:** 2018-11-29
- **FAA docket:** Docket No. FAA-2017-1138
## Abstract

We are adopting a new airworthiness directive (AD) for certain Austro Engine GmbH model E4 engines and for all model E4P engines. This AD was prompted by reports of considerable wear on the timing chain on these engines. This AD requires replacement of the timing chain and amending certain airplane flight manuals to limit the use of windmill restarts. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/10/25/2018-23186/airworthiness-directives-austro-engine-gmbh-engines)
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