# Airworthiness Directives; MD Helicopters, Inc. (MDHI), Helicopters
> **Rule** · Final rule. · Published 2019-03-13 · Effective 2019-04-17 · 84 FR 8959
## Document
- **Document number:** 2019-04528
- **Category:** airworthiness
- **Manufacturer:** MD
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 84 FR 8959
- **Publication date:** 2019-03-13
- **Effective date:** 2019-04-17
- **FAA docket:** Docket No. FAA-2018-0991
## Abstract

We are adopting a new airworthiness directive (AD) for MDHI Model 369A, 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters. This AD requires inspecting each main rotor blade (MRB) for a crack. This AD was prompted by reports of cracked MRBs. The actions of this AD are intended to address an unsafe condition on these helicopters.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/03/13/2019-04528/airworthiness-directives-md-helicopters-inc-mdhi-helicopters)
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