# Airworthiness Directives; Eurocopter France Model SA-366G1 Helicopters
> **Rule** · Final rule. · Published 1998-02-27 · Effective 1998-04-03 · 63 FR 9936
## Document
- **Document number:** 98-4979
- **Category:** airworthiness
- **Manufacturer:** Eurocopter France Model SA-366G1
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 9936
- **Publication date:** 1998-02-27
- **Effective date:** 1998-04-03
- **FAA docket:** Docket No. 97-SW-09-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Eurocopter France Model SA-366G1 helicopters, with certain main rotor head frequency adapters (frequency adapters) installed. This proposal requires inspecting the frequency adapter to determine if a certain frequency adapter is installed, and if so, removing and discarding the frequency adapter and replacing it with an airworthy frequency adapter before further flight. This amendment is prompted by a report of disbonding of the metal center section of a frequency adapter from the elastomer, caused by a lack of adherence during the production process. The actions specified by this AD are intended to prevent vibrations caused by disbonding of the center section of a frequency adapter from the elastomer, that could result in loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/02/27/98-4979/airworthiness-directives-eurocopter-france-model-sa-366g1-helicopters)
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