# Airworthiness Directives; Erickson Air-Crane Incorporated Model S-64F Helicopters
> **Rule** · Final rule. · Published 2011-10-27 · Effective 2011-12-01 · 76 FR 66617
## Document
- **Document number:** 2011-27775
- **Category:** airworthiness
- **Manufacturer:** Erickson Air-Crane Incorporated Model S-64F
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 76 FR 66617
- **Publication date:** 2011-10-27
- **Effective date:** 2011-12-01
- **FAA docket:** Docket No. FAA-2010-0909
## Abstract

We are adopting a new airworthiness directive (AD) for the Erickson Air-Crane (Erickson Air-Crane) Model S-64F helicopters. The amendment requires, at specified intervals, certain inspections of the rotating swashplate assembly (swashplate) for a crack. If a crack is found, this AD also requires, before further flight, replacing the swashplate with an airworthy swashplate. This AD is prompted by a report from the manufacturer of a swashplate cracking during fatigue testing. We are issuing this AD to prevent loss of a swashplate due to a fatigue crack, loss of control of the main rotor system, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/10/27/2011-27775/airworthiness-directives-erickson-air-crane-incorporated-model-s-64f-helicopters)
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