# Proposed AD 97-SW-64-AD: Eurocopter France Model AS-365N, N1, and N2 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-06-03
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 5, 1998, 63 FR 30662
- Comments due: July 6, 1998
- Became: [AD 99-06-03](https://openairdocs.org/ad/99-06-03)
- Docket: 97-SW-64-AD
- FR document: 98-14928
- Official PDF: https://openairdocs.org/files/sha256/b9/ca/b9ca65aade23762f9d6fd4a24aa2985406f9f12f96c34d6dcc5b45eebf6c7ad4 (from https://www.govinfo.gov/content/pkg/FR-1998-06-05/pdf/98-14928.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/06/05/98-14928/airworthiness-directives-eurocopter-france-model-as-365n-n1-and-n2-helicopters
- Page: https://openairdocs.org/proposed/97-SW-64-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Eurocopter France Model AS-365N, N1, and N2 helicopters, with certain main rotor head frequency adapters (frequency adapters) installed. This proposal would require inspecting the frequency adapter to determine if a certain frequency adapter is installed, and if so, removing and replacing the frequency adapter with an airworthy frequency adapter before further flight. This proposal is prompted by a report of disbonding of the metal center section of a frequency adapter from the elastomer on a main rotor head, caused by a lack of adherence during the production process. The actions specified by the proposed AD are intended to prevent increased vibrations caused by disbonding of the center section of a frequency adapter from the elastomer and subsequent reduced controllability of the helicopter.

## Notices in this docket

- Jun 5, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-14928, comments due Jul 6, 1998 (https://www.federalregister.gov/documents/1998/06/05/98-14928/airworthiness-directives-eurocopter-france-model-as-365n-n1-and-n2-helicopters)

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