# Airworthiness Directives; Eurocopter France Model EC 120B Helicopters
> **Rule** · Final rule. · Published 2011-12-05 · Effective 2011-12-20 · 76 FR 75772
## Document
- **Document number:** 2011-30939
- **Category:** airworthiness
- **Manufacturer:** Eurocopter France Model EC 120B
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 76 FR 75772
- **Publication date:** 2011-12-05
- **Effective date:** 2011-12-20
- **FAA docket:** Docket No. FAA-2011-0448
## Abstract

This amendment adopts a new airworthiness directive (AD) for the Eurocopter France Model EC 120B helicopters. This AD requires modifying the pilot cyclic control friction device by replacing a certain thrust washer with two thrust washers. This AD is prompted by an incident in which the pilot encountered a sudden restriction of the cyclic control movement during flight. The actions specified by this AD are intended to prevent jamming of a pilot cyclic control stick and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/12/05/2011-30939/airworthiness-directives-eurocopter-france-model-ec-120b-helicopters)
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