# Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
> **Rule** · Final rule. · Published 2021-06-24 · Effective 2021-07-29 · 86 FR 33108
## Document
- **Document number:** 2021-13127
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 33108
- **Publication date:** 2021-06-24
- **Effective date:** 2021-07-29
- **FAA docket:** Docket No. FAA-2021-0256
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 D-2 helicopters. This AD was prompted by a short circuit in a yaw trim actuator connector that occurred during production electrical tests. This AD requires replacing certain wire harness trim connector backshells (backshells), as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/06/24/2021-13127/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters)
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