# Airworthiness Directives; Airbus Helicopters
> **Rule** · Final rule. · Published 2026-08-06 · Effective 2026-09-10 · 91 FR 50691
## Document
- **Document number:** 2026-16047
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 50691
- **Publication date:** 2026-08-06
- **Effective date:** 2026-09-10
- **FAA docket:** Docket No. FAA-2026-4638
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350D, EC130B4, and EC130T2 helicopters. This AD was prompted by reports of an incorrectly installed engine flange on the main gear box (MGB) engine coupling. This AD requires inspecting the MGB engine coupling for correct installation and, depending on the results, 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/2026/08/06/2026-16047/airworthiness-directives-airbus-helicopters)
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