# Airworthiness Directives; Airbus Helicopters
> **Rule** · Final rule. · Published 2026-08-13 · Effective 2026-09-17 · 91 FR 52221
## Document
- **Document number:** 2026-16507
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 52221
- **Publication date:** 2026-08-13
- **Effective date:** 2026-09-17
- **FAA docket:** Docket No. FAA-2026-4646
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model AS350B2 helicopters. This AD was prompted by a report of magnetization on the solenoid valves for the three main servo-controls, the regulator block, and the tail servo- control due to a diode not properly installed in the hydraulic circuit. This AD requires performing a cut-off test of the rear rotor actuator valve and, depending on the results of the test, performing 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/2026/08/13/2026-16507/airworthiness-directives-airbus-helicopters)
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