# Airworthiness Directives; The Enstrom Helicopter Corporation
> **Rule** · Final rule; request for comments. · Published 2015-05-18 · Effective 2015-06-02 · 80 FR 28172
## Document
- **Document number:** 2015-11732
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 80 FR 28172
- **Publication date:** 2015-05-18
- **Effective date:** 2015-06-02
- **FAA docket:** Docket No. FAA-2015-1537
## Abstract

We are publishing a new airworthiness directive (AD) for Enstrom Helicopter Corporation (Enstrom) Model F-28A, 280, F-28C, F- 28C-2, F-28C-2R, 280C, F-28F, F-28F-R, 280F, 280FX, and 480 helicopters. This AD was sent previously to all known U.S. owners and operators of these helicopters and supersedes Emergency AD (EAD) 2015- 04-51, dated February 12, 2015. This AD requires inspecting certain main rotor spindles (spindles) for cracks and reporting the inspection results to the FAA. This AD is prompted by a fatal accident and reports of spindles with cracks. The actions specified in this AD are intended to detect a crack in a spindle and prevent loss of a main rotor blade and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/05/18/2015-11732/airworthiness-directives-the-enstrom-helicopter-corporation)
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