# Airworthiness Directives; Various Restricted Category Helicopters
> **Rule** · Final rule; request for comments. · Published 2018-01-17 · Effective 2018-02-01 · 83 FR 2361
## Document
- **Document number:** 2018-00658
- **Category:** airworthiness
- **Manufacturer:** Various Restricted Category
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 83 FR 2361
- **Publication date:** 2018-01-17
- **Effective date:** 2018-02-01
- **FAA docket:** Docket No. FAA-2017-0894
## Abstract

We are adopting a new airworthiness directive (AD) for Model TH-1F, UH-1B, UH-1F, UH-1H, and UH-1P helicopters with a Helicopter Technology Company (HTC) main rotor (M/R) blade installed. This AD requires cleaning and visually inspecting the M/R blades and, depending on the outcome of the inspection, repairing or replacing the M/R blades. This AD is prompted by a report of an M/R blade with a fatigue crack in the grip plate and doublers at the blade retention bolt hole. The actions of this AD are intended to correct an unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/01/17/2018-00658/airworthiness-directives-various-restricted-category-helicopters)
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