# 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 2000-05-22 · Effective 2000-06-26 · 65 FR 32016
## Document
- **Document number:** 00-12575
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 65 FR 32016
- **Publication date:** 2000-05-22
- **Effective date:** 2000-06-26
- **FAA docket:** Docket No. 99-SW-39-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD) that applies to Eurocopter France Model AS-350B, BA, B1, B2, and D, and Model AS-355E, F, F1, F2, and N helicopters and requires inspecting the main gearbox suspension bi-directional cross-beam (cross-beam) for cracks, and replacing the cross-beam if a crack is found. This amendment requires the same inspections as the existing AD, but adds the time intervals for performing repetitive dye-penetrant inspections on cross-beams with 5,000 or more hours time-in-service (TIS). This amendment is prompted by the discovery that time intervals for performing the required dye-penetrant inspections are not included in the existing AD. The actions specified by this AD are intended to prevent failure of the cross-beam that could lead to rotation of the main gearbox, resulting in severe vibrations and a subsequent forced landing.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/05/22/00-12575/airworthiness-directives-eurocopter-france-model-as-350b-ba-b1-b2-and-d-and-model-as-355e-f-f1-f2)
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