# Proposed AD 97-SW-21-AD: Eurocopter France Model SA 365N, N1 and AS 365N2 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-08-14
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 9, 1997, 62 FR 64785
- Comments due: February 9, 1998
- Became: [AD 98-08-14](https://openairdocs.org/ad/98-08-14)
- Docket: 97-SW-21-AD
- FR document: 97-32117
- Official PDF: https://openairdocs.org/files/sha256/1c/34/1c34340995477cb6801fa7c91cc995f996a0f8160ab0f8e9e0636629d88c03e3 (from https://www.govinfo.gov/content/pkg/FR-1997-12-09/pdf/97-32117.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/12/09/97-32117/airworthiness-directives-eurocopter-france-model-sa-365n-n1-and-as-365n2-helicopters
- Page: https://openairdocs.org/proposed/97-SW-21-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Eurocopter France (Eurocopter) Model SA-365N, N1 and AS-365N2 helicopters. This proposal would require inspections of the main gearbox suspension diagonal cross-member (diagonal cross-member) for cracks, and removal of the diagonal cross- member and replacement with an airworthy diagonal cross-member if any crack is found. This proposal is prompted by several reports of the discovery of cracks in diagonal cross-members. The actions specified by the proposed AD are intended to prevent failure of the diagonal cross- member which could cause the main gearbox to pivot, resulting in severe vibrations and a subsequent forced landing.

## Notices in this docket

- Dec 9, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-32117, comments due Feb 9, 1998 (https://www.federalregister.gov/documents/1997/12/09/97-32117/airworthiness-directives-eurocopter-france-model-sa-365n-n1-and-as-365n2-helicopters)

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