# Proposed AD 2003-SW-12-AD: Eurocopter France Model EC 155B Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-05-29
- Products: Eurocopter France
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 24, 2003, 68 FR 65856
- Comments due: January 23, 2004
- Became: [AD 2004-05-29](https://openairdocs.org/ad/2004-05-29)
- Docket: 2003-SW-12-AD
- FR document: 03-29220
- Official PDF: https://openairdocs.org/files/sha256/5c/cc/5ccc7662e24b1fe32eaee89aca77ce2246a72f0b25c4445d9ffb50ee553a49e2 (from https://www.govinfo.gov/content/pkg/FR-2003-11-24/pdf/03-29220.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/11/24/03-29220/airworthiness-directives-eurocopter-france-model-ec-155b-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7CA28E2EB6ED58AD86256DE80050D315.0001
- Page: https://openairdocs.org/proposed/2003-SW-12-AD

## Summary

This document proposes adopting a new airworthiness directive (AD) for the specified Eurocopter France (Eurocopter) model helicopters. This proposal would require installing a tail rotor blade (blade)-to-torsion bar attachment bushing (bushing) with a tuning weight assembly on each blade of the Quiet Fenestron tail rotor, and replacing each blade attachment bushing. This proposal is prompted by a discovery of tail rotor induced vibration during flight tests. The actions specified by this proposed AD are intended to prevent vibrations in the tail rotor and the pilot's anti-torque pedals, blade pitch control failure, and subsequent loss of control of the helicopter.

## Notices in this docket

- Nov 24, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-29220, comments due Jan 23, 2004 (https://www.federalregister.gov/documents/2003/11/24/03-29220/airworthiness-directives-eurocopter-france-model-ec-155b-helicopters)

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