# Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
> **Rule** · Final rule. · Published 2026-05-13 · Effective 2026-06-17 · 91 FR 26906
## Document
- **Document number:** 2026-09521
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 26906
- **Publication date:** 2026-05-13
- **Effective date:** 2026-06-17
- **FAA docket:** Docket No. FAA-2026-0730
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 C-2 and MBB- BK 117 D-2 helicopters. This AD was prompted by a determination that a certain part-numbered standard MS18027 type hook may be subject to localized yielding in the mating threads when assembled to higher assembly torques. This AD requires modifying and re-identifying the affected part or replacing the affected part with a serviceable part. This AD also prohibits installing an affected part 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/2026/05/13/2026-09521/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters)
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