# Airworthiness Directives; AERO Sp. z o.o. Airplanes
> **Rule** · Final rule; request for comments. · Published 2021-10-07 · Effective 2021-10-27 · 86 FR 55685
## Document
- **Document number:** 2021-21932
- **Category:** airworthiness
- **Manufacturer:** AERO Sp. z o.o.
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 86 FR 55685
- **Publication date:** 2021-10-07
- **Effective date:** 2021-10-27
- **FAA docket:** Docket No. FAA-2021-0782
## Abstract

The FAA is adopting a new airworthiness directive (AD) for AERO Sp. z o.o. (AERO) Model AT-3R100 airplanes with an ELPROP 3-1-1P propeller. This AD results from mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as cracks in the propeller hub. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/10/07/2021-21932/airworthiness-directives-aero-sp-z-oo-airplanes)
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