# Proposed AD FAA-2012-0503: Eurocopter Deutschland GmbH Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-19-14
- Products: Eurocopter Deutschland
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 11, 2012, 77 FR 27659
- Comments due: July 10, 2012
- Became: [AD 2015-19-14](https://openairdocs.org/ad/2015-19-14)
- Docket: FAA-2012-0503 (https://www.regulations.gov/docket/FAA-2012-0503, where comments are filed)
- Project: 2011-SW-032-AD
- FR document: 2012-11468
- Official PDF: https://openairdocs.org/files/sha256/07/09/07097075b7b6f353fbaa371c4db935af4d91767a91d93bac9d5f466a13fd384d (from https://www.govinfo.gov/content/pkg/FR-2012-05-11/pdf/2012-11468.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/05/11/2012-11468/airworthiness-directives-eurocopter-deutschland-gmbh-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F2AC43F6165940E9862579FB0052BED8.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0503

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Eurocopter Deutschland GmbH (ECD) Model BO-105A, BO-105C, and BO-105S helicopters. This proposed AD is prompted by initial findings from an accident investigation of an ECD Model BO 105 helicopter which indicated deterioration of the main gearbox (MGB) caused by a contaminated oil supply. The proposed actions are intended to detect oil contamination in the MGB, which if not detected, could result in MGB deterioration, MGB failure, and subsequent loss of control of the helicopter.

## Notices in this docket

- May 11, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-11468, comments due Jul 10, 2012 (https://www.federalregister.gov/documents/2012/05/11/2012-11468/airworthiness-directives-eurocopter-deutschland-gmbh-helicopters)

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