# Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
> **Rule** · Final rule; request for comments. · Published 2026-04-29 · Effective 2026-05-14 · 91 FR 22995
## Document
- **Document number:** 2026-08324
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 91 FR 22995
- **Publication date:** 2026-04-29
- **Effective date:** 2026-05-14
- **FAA docket:** Docket No. FAA-2026-3867
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Helicopters Model MBB-BK 117 D-3 helicopters. The FAA previously sent this AD as an emergency AD to all known U.S. owners and operators of these helicopters. This AD was prompted by a report of a crack on the affected part, which was detected after the crew reported increased vibration of the helicopter. This AD requires inspecting the rotor hub-shaft for a crack and depending on the inspection results, replacing any rotor hub-shaft that has any cracks and reporting information after accomplishment of the replacement. This AD also prohibits installing any affected rotor hub- shaft on any 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/2026/04/29/2026-08324/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters)
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