# Proposed AD FAA-2012-0528: Eurocopter Deutschland Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-23-05
- Products: Eurocopter Deutschland
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 22, 2012, 77 FR 30230
- Comments due: July 23, 2012
- Became: [AD 2012-23-05](https://openairdocs.org/ad/2012-23-05)
- Docket: FAA-2012-0528 (https://www.regulations.gov/docket/FAA-2012-0528, where comments are filed)
- Project: 2011-SW-068-AD
- FR document: 2012-12349
- Official PDF: https://openairdocs.org/files/sha256/be/16/be16696a37bf8750097b4f04dcab1caf7032c76467b298d5dda37db588724a86 (from https://www.govinfo.gov/content/pkg/FR-2012-05-22/pdf/2012-12349.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/05/22/2012-12349/airworthiness-directives-eurocopter-deutschland-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D65E1630D36753E686257A060048D330.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0528

## Summary

We propose to adopt a new airworthiness directive (AD) for all Eurocopter Deutschland GmbH Model MBB-BK117 C-2 helicopters with certain Generator Control Units (GCU) installed. This proposed AD is prompted by reports of internal short circuits in certain GCUs. The proposed actions are intended to replace any affected GCUs to prevent a short circuit, which could result in a loss of electrical generating power, loss of systems required for continued safe flight and landing, and subsequent loss of control of the helicopter.

## Notices in this docket

- May 22, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-12349, comments due Jul 23, 2012 (https://www.federalregister.gov/documents/2012/05/22/2012-12349/airworthiness-directives-eurocopter-deutschland-helicopters)

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