# Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters
> **Rule** · Final rule. · Published 2026-06-04 · Effective 2026-07-09 · 91 FR 33595
## Document
- **Document number:** 2026-11175
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 33595
- **Publication date:** 2026-06-04
- **Effective date:** 2026-07-09
- **FAA docket:** Docket No. FAA-2025-2540
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 D-3 helicopters. This AD was prompted by a report of excessive vibrations in-flight due to an incorrect installation of the angular ball bearing of the control ring assembly. This AD requires a one-time inspection of the affected swashplates and, depending on the results of the inspection, corrective actions. This AD prohibits the installation of an affected swashplate on a helicopter, unless certain requirements are met. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/06/04/2026-11175/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters)
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