# Airworthiness Directives; Various Restricted Category Helicopters
> **Rule** · Final rule. · Published 2022-01-21 · Effective 2022-02-25 · 87 FR 3176
## Document
- **Document number:** 2022-00991
- **Category:** airworthiness
- **Manufacturer:** Various Restricted Category
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 87 FR 3176
- **Publication date:** 2022-01-21
- **Effective date:** 2022-02-25
- **FAA docket:** Docket No. FAA-2021-0189
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain type certificated Model UH-1H restricted category helicopters. This AD was prompted by multiple reports of failure of the main driveshaft. This AD requires establishing a limit to replace certain main driveshafts, and a one-time and repetitive inspections of the main driveshafts. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/01/21/2022-00991/airworthiness-directives-various-restricted-category-helicopters)
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