# Proposed AD FAA-2005-20863: Eurocopter France Model AS350B, BA, B1, B2, B3, D, and AS355E Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-12-22
- Products: Eurocopter France
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 7, 2005, 70 FR 17621
- Comments due: June 6, 2005
- Became: [AD 2007-12-22](https://openairdocs.org/ad/2007-12-22)
- Docket: FAA-2005-20863 (https://www.regulations.gov/docket/FAA-2005-20863, where comments are filed)
- Project: 2004-SW-36-AD
- FR document: 05-6917
- Official PDF: https://openairdocs.org/files/sha256/c4/a9/c4a92ab1f1596cb90db2075a0250cb6e4b32455ab76a9423dcf6335ffdbbad02 (from https://www.govinfo.gov/content/pkg/FR-2005-04-07/pdf/05-6917.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/04/07/05-6917/airworthiness-directives-eurocopter-france-model-as350b-ba-b1-b2-b3-d-and-as355e-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1585CB27EDBEB8CC86256FDC006910ED.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20863

## Summary

This document proposes adopting a new airworthiness directive (AD) for the specified Eurocopter France (ECF) model helicopters. This proposal would require replacing the hydraulic fluid at a specified time interval when operating in cold weather. This proposal is prompted by reports of ice forming due to condensation in some parts of the hydraulic system during cold weather operation. The actions specified by this proposed AD are intended to prevent ice from forming in the hydraulic system resulting in an unintended movement of the flight controls and subsequent loss of control of the helicopter.

## Notices in this docket

- Apr 7, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-6917, comments due Jun 6, 2005 (https://www.federalregister.gov/documents/2005/04/07/05-6917/airworthiness-directives-eurocopter-france-model-as350b-ba-b1-b2-b3-d-and-as355e-helicopters)

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