# Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D, and Model AS-355E, F, F1, F2, and N Helicopters
> **Rule** · Final rule. · Published 1998-06-29 · Effective 1998-08-03 · 63 FR 35128
## Document
- **Document number:** 98-17178
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 35128
- **Publication date:** 1998-06-29
- **Effective date:** 1998-08-03
- **FAA docket:** Docket No. 97-SW-25-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Model AS-350B, BA, B1, B2, and D, and Model AS-355E, F, F1, F2, and N helicopters, that requires 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 amendment is prompted by several reports of cracks in the cross-beam. The actions specified by this 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/06/29/98-17178/airworthiness-directives-eurocopter-france-model-as-350b-ba-b1-b2-and-d-and-model-as-355e-f-f1-f2)
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