# Airworthiness Directives; Eurocopter Deutschland GmbH Helicopters
> **Rule** · Final rule. · Published 2013-08-23 · Effective 2013-09-27 · 78 FR 52410
## Document
- **Document number:** 2013-19442
- **Category:** airworthiness
- **Manufacturer:** Eurocopter Deutschland GmbH
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 52410
- **Publication date:** 2013-08-23
- **Effective date:** 2013-09-27
- **FAA docket:** Docket No. FAA-2012-0887
## Abstract

We are adopting a new airworthiness directive (AD) for Eurocopter Deutschland GmbH (ECD) Model BO-105A, BO-105C, BO-105S, BO- 105LS A-1, BO-105LS A-3, MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A- 4, MBB-BK 117 B-1, MBB-BK-117 B-2, and MBB-BK 117 C-1 helicopters to require inspections for corrosion or thread damage to each tail rotor balance weight (weight) and each tail rotor control lever (lever). This AD was prompted by a European Aviation Safety Agency (EASA) AD and a Transport Canada Civil Aviation (TCCA) AD, both issued based on a report that corrosion was detected on a weight in the area of the attachment thread on a model BO-105 helicopter. The actions of this AD are intended to detect corrosion and thread damage in the threaded area of the weight and lever, and to prevent failure of a weight or lever, separation of tail rotor parts, severe vibration, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/08/23/2013-19442/airworthiness-directives-eurocopter-deutschland-gmbh-helicopters)
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