# Proposed AD 2000-SW-25-AD: Eurocopter France Model AS-350B, BA, B1, B2, B3, C, D, and D1, and AS-355E, F, F1, F2 and N Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-20-19
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 20, 2000, 65 FR 44995
- Comments due: September 18, 2000
- Became: [AD 2000-20-19](https://openairdocs.org/ad/2000-20-19)
- Docket: 2000-SW-25-AD
- FR document: 00-18405
- Official PDF: https://openairdocs.org/files/sha256/52/a6/52a6cda1b37cad37b84288b03b65b84501781f18a85663ab386e503ec24291d4 (from https://www.govinfo.gov/content/pkg/FR-2000-07-20/pdf/00-18405.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/07/20/00-18405/airworthiness-directives-eurocopter-france-model-as-350b-ba-b1-b2-b3-c-d-and-d1-and-as-355e-f-f1-f2
- Page: https://openairdocs.org/proposed/2000-SW-25-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD) that applies to Eurocopter France Model AS-350B, BA, B1, B2, C, D, and D1, and AS-355E, F, F1, and F2 helicopters. That AD currently requires inspections of the main rotor head components, the main gearbox (MGB) suspension bars, and the ground resonance prevention system components. This action would require those same inspections, but would also apply to Model AS-350B3 and AS-355N helicopters. This proposal is prompted by the inadvertent omission of those model helicopters from the previous AD. The actions specified by the proposed AD are intended to prevent ground resonance due to reduced structural stiffness, which could lead to failure of a main rotor head or MGB suspension component and subsequent loss of control of the helicopter.

## Notices in this docket

- Jul 20, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-18405, comments due Sep 18, 2000 (https://www.federalregister.gov/documents/2000/07/20/00-18405/airworthiness-directives-eurocopter-france-model-as-350b-ba-b1-b2-b3-c-d-and-d1-and-as-355e-f-f1-f2)

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