# Airworthiness Directives; MD Helicopters, Inc., Helicopters
> **Rule** · Final rule; request for comments. · Published 2014-08-05 · Effective 2014-08-20 · 79 FR 45322
## Document
- **Document number:** 2014-18163
- **Category:** airworthiness
- **Manufacturer:** MD
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 79 FR 45322
- **Publication date:** 2014-08-05
- **Effective date:** 2014-08-20
- **FAA docket:** Docket No. FAA-2014-0514
## Abstract

We are adopting a new airworthiness directive (AD) for MD Helicopters, Inc. (MDHI), Model MD900 helicopters. This AD requires an eddy current inspection of the main rotor upper hub assembly (upper hub) for a crack and replacing the upper hub with an airworthy upper hub before further flight if there is a crack. This AD is prompted by a report of cracks on an upper hub at the blade attach holes. The actions specified by this AD are intended to detect a crack in the upper hub to prevent failure of the upper hub and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/08/05/2014-18163/airworthiness-directives-md-helicopters-inc-helicopters)
---
*AI Analytics · CC0 1.0*