# Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
> **Rule** · Final rule; request for comments. · Published 2026-10-09 · Effective 2026-10-26 · 91 FR 64606
## Document
- **Document number:** 2026-20722
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 91 FR 64606
- **Publication date:** 2026-10-09
- **Effective date:** 2026-10-26
- **FAA docket:** Docket No. FAA-2026-11805
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 C-1 helicopters. This AD was prompted by a report of a louver box assembly detaching in flight due to incorrect installation. This AD requires repetitively accomplishing a play check of the affected louver box assembly and, depending on the results of the check, accomplishing corrective actions. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/10/09/2026-20722/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters)
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