# Proposed AD 97-SW-25-AD: Eurocopter France Model AS-350B, BA, B1, B2, and D, and Model AS-355E, F, F1, F2, and N Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-14-01
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 3, 1998, 63 FR 10349
- Comments due: April 2, 1998
- Became: [AD 98-14-01](https://openairdocs.org/ad/98-14-01)
- Docket: 97-SW-25-AD
- FR document: 98-5354
- Official PDF: https://openairdocs.org/files/sha256/5e/e0/5ee006ef3a57195ea937f7777f65d9541e6857f3b59379f7f18f67fa55124e45 (from https://www.govinfo.gov/content/pkg/FR-1998-03-03/pdf/98-5354.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/03/03/98-5354/airworthiness-directives-eurocopter-france-model-as-350b-ba-b1-b2-and-d-and-model-as-355e-f-f1-f2
- Page: https://openairdocs.org/proposed/97-SW-25-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Eurocopter France (Eurocopter) Model AS-350B, BA, B1, B2, and D, and Model AS-355E, F, F1, F2, and N helicopters. This proposal would require inspections of the main gearbox suspension bi-directional cross-beam (cross-beam) for cracks, and replacement of the cross-beam if a crack is found. This proposal is prompted by several reports of cracks in the cross-beam. The actions specified by the proposed AD are intended to provide a terminating action to prevent failure of the cross-beam that could cause the main gearbox to pivot, resulting in severe vibrations and a subsequent forced landing.

## Notices in this docket

- Mar 3, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-5354, comments due Apr 2, 1998 (https://www.federalregister.gov/documents/1998/03/03/98-5354/airworthiness-directives-eurocopter-france-model-as-350b-ba-b1-b2-and-d-and-model-as-355e-f-f1-f2)

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