# Proposed AD FAA-2005-20289: Eurocopter France Model EC120 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-09-05
- Products: Eurocopter France
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 10, 2005, 70 FR 7056
- Comments due: April 11, 2005
- Became: [AD 2005-09-05](https://openairdocs.org/ad/2005-09-05)
- Docket: FAA-2005-20289 (https://www.regulations.gov/docket/FAA-2005-20289, where comments are filed)
- Project: 2003-SW-55-AD
- FR document: 05-2586
- Official PDF: https://openairdocs.org/files/sha256/f1/e0/f1e08bd087a09ddb7d32ed70746f65a0214586749c1519e89826c07098c82902 (from https://www.govinfo.gov/content/pkg/FR-2005-02-10/pdf/05-2586.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/02/10/05-2586/airworthiness-directives-eurocopter-france-model-ec120-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CA72D6FD7C81EFA286256FA4005E0865.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20289

## Summary

This document proposes adopting a new airworthiness directive (AD) for Eurocopter France (Eurocopter) Model EC120 helicopters. This proposal would require inspecting the tail rotor drive shaft (drive shaft) damper half-clamps (half-clamps) to determine if they are centered on the friction ring, and if not correctly positioned, centering the half-clamps on the friction ring. This proposal is prompted by the discovery of half-clamps that were incorrectly positioned. This condition, if not detected, could result in interference of the two half-clamps with the drive shaft, which could result in scoring on the drive shaft, failure of the drive shaft, and subsequent loss of control of the helicopter.

## Notices in this docket

- Feb 10, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-2586, comments due Apr 11, 2005 (https://www.federalregister.gov/documents/2005/02/10/05-2586/airworthiness-directives-eurocopter-france-model-ec120-helicopters)

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