# Airworthiness Directives; Various Restricted Category Helicopters
> **Rule** · Final rule; request for comments. · Published 2012-07-23 · Effective 2012-08-07 · 77 FR 42971
## Document
- **Document number:** 2012-17279
- **Category:** airworthiness
- **Manufacturer:** Various Restricted Category
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 77 FR 42971
- **Publication date:** 2012-07-23
- **Effective date:** 2012-08-07
- **FAA docket:** Docket No. FAA-2012-0739
## Abstract

We are adopting a new airworthiness directive (AD) for Arrow Falcon Exporters, Inc. (AFE), Rotorcraft Development Corporation (RDC), and San Joaquin Helicopters (SJH) Model OH-58A, OH-58A+, and OH-58C helicopters to require inspecting the main rotor mast (mast) for a crack. This AD is prompted by two reported failures of the mast from corrosion-initiated fatigue cracking. The actions specified by this AD are intended to prevent failure of the mast and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/07/23/2012-17279/airworthiness-directives-various-restricted-category-helicopters)
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