# Airworthiness Directives; Austro Engine GmbH Engines
> **Rule** · Final rule. · Published 2020-11-05 · Effective 2020-12-10 · 85 FR 70442
## Document
- **Document number:** 2020-24539
- **Category:** airworthiness
- **Manufacturer:** Austro
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 70442
- **Publication date:** 2020-11-05
- **Effective date:** 2020-12-10
- **FAA docket:** Docket No. FAA-2019-0664
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2018-07-16 for all Austro Engine GmbH model E4 and E4P diesel piston engines. AD 2018-07-16 required initial and repetitive replacement of the waste gate controller and the control rod circlip. This AD retains the requirements of AD 2018-07-16 and requires engine modification by installing a waste gate control-rod fail-safe bridge and new spring- loaded circlip that terminates the initial and repetitive replacement requirements of AD 2018-07-16. This AD was prompted by the development of a modification of the waste gate control rod by adding a fail-safe bridge and spring-loaded circlip. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/11/05/2020-24539/airworthiness-directives-austro-engine-gmbh-engines)
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