# Airworthiness Directives; MT-Propeller Entwicklung GmbH Propellers
> **Rule** · Final rule; request for comments. · Published 2022-09-01 · Effective 2022-09-16 · 87 FR 53648
## Document
- **Document number:** 2022-19050
- **Category:** airworthiness
- **Manufacturer:** MT-Propeller Entwicklung GmbH
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 87 FR 53648
- **Publication date:** 2022-09-01
- **Effective date:** 2022-09-16
- **FAA docket:** Docket No. FAA-2022-1056
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain MT-Propeller Entwicklung GmbH MTV-5-1-( ), MTV-9-( ), MTV-11-( ), MTV-12-( ), MTV-14-B, MTV-14-D, MTV-15-( ), MTV-16-( ), MTV-17-( ), MTV-18-( ), MTV-20-( ), and MTV-27-( ) variable pitch propellers. This AD was prompted by reports of certain propeller blade lag screws that were manufactured with an improper surface finish, which results in reduced fatigue strength of these lag screws. This AD requires replacement of certain propeller blade lag screws with parts eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/09/01/2022-19050/airworthiness-directives-mt-propeller-entwicklung-gmbh-propellers)
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