# Proposed AD 2001-SW-52-AD: Eurocopter France Model EC120B Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-08-04
- Products: Eurocopter France
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 14, 2002, 67 FR 6883
- Comments due: April 15, 2002
- Became: [AD 2003-08-04](https://openairdocs.org/ad/2003-08-04)
- Docket: 2001-SW-52-AD
- FR document: 02-3580
- Official PDF: https://openairdocs.org/files/sha256/a0/e5/a0e53bb338ecb22c8da8c5922402687f90cd60d5ff1ceddc1af38cbe0ff1ced4 (from https://www.govinfo.gov/content/pkg/FR-2002-02-14/pdf/02-3580.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/02/14/02-3580/airworthiness-directives-eurocopter-france-model-ec120b-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C26165B686D1C56286256B610057BE7A.0001
- Page: https://openairdocs.org/proposed/2001-SW-52-AD

## Summary

This document proposes adopting a new airworthiness directive (AD) for Eurocopter France (ECF) Model EC120B helicopters. This proposal would require inspecting the attachment of the bolted assemblies of the cyclic pitch flight control torque tube (torque tube) for an appropriate locking device. If a bolted assembly is single-locked, the proposed AD would require, if necessary, tightening the self-locking nuts at certain intervals and modifying the torque tube after a certain time. This proposal is prompted by the discovery that some of the attachments of the torque tube were fastened with a single-locking device instead of the intended double-locking device. The actions specified by this proposed AD are intended to prevent separation of the cyclic pitch stick yokes from the torque tube, loss of cyclic control, and subsequent loss of control of the helicopter.

## Notices in this docket

- Feb 14, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-3580, comments due Apr 15, 2002 (https://www.federalregister.gov/documents/2002/02/14/02-3580/airworthiness-directives-eurocopter-france-model-ec120b-helicopters)

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