# Airworthiness Directives; The Enstrom Helicopter Corporation Helicopters
> **Rule** · Final rule. · Published 2018-01-17 · Effective 2018-02-21 · 83 FR 2366
## Document
- **Document number:** 2018-00659
- **Category:** airworthiness
- **Manufacturer:** The Enstrom Helicopter Corporation
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 2366
- **Publication date:** 2018-01-17
- **Effective date:** 2018-02-21
- **FAA docket:** Docket No. FAA-2017-0141
## Abstract

We are superseding Airworthiness Directive (AD) 2015-08-51 for the 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. AD 2015-08-51 required an inspection of the main rotor spindle (spindle) and reporting the inspection results to the FAA. This new AD was prompted by additional reports of cracked spindles and requires establishing a life limit and a recurring inspection. The actions of this AD are intended to prevent the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/01/17/2018-00659/airworthiness-directives-the-enstrom-helicopter-corporation-helicopters)
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