# Airworthiness Directives; Columbia Helicopters, Inc., and Restricted Category Model CH-47D Helicopters
> **Rule** · Final rule; request for comments. · Published 2024-10-11 · Effective 2024-10-28 · 89 FR 82496
## Document
- **Document number:** 2024-23547
- **Category:** airworthiness
- **Manufacturer:** Columbia
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 89 FR 82496
- **Publication date:** 2024-10-11
- **Effective date:** 2024-10-28
- **FAA docket:** Docket No. FAA-2024-2329
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Columbia Helicopters, Inc., Model 234 helicopters and restricted category Model CH-47D helicopters. This AD was prompted by two reports of a flight control rigid connecting link (link) failure, due to a manufacturing defect. This AD requires removing certain links from service and prohibits installing those links. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/10/11/2024-23547/airworthiness-directives-columbia-helicopters-inc-and-restricted-category-model-ch-47d-helicopters)
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