# Airworthiness Directives; Airbus Helicopters
> **Rule** · Final rule. · Published 2026-08-14 · Effective 2026-09-18 · 91 FR 52494
## Document
- **Document number:** 2026-16641
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 52494
- **Publication date:** 2026-08-14
- **Effective date:** 2026-09-18
- **FAA docket:** Docket No. FAA-2026-4644
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2023-25- 14, which applied to certain Airbus Helicopters Model EC130T2 helicopters. AD 2023-25-14 revised the procedures for inspecting the vibration level on the tail rotor drive shaft and, depending on these results, required replacing certain parts. Since the FAA issued AD 2023-25-14, the manufacturer developed a modification of the rear drive shaft, sliding flange, and equipped splined sleeve. This AD requires installing this modification and repetitively inspecting the vibration level of the tail rotor drive shaft. This AD also prohibits the installation of certain parts and prohibits the performance of a balance correction 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/2026/08/14/2026-16641/airworthiness-directives-airbus-helicopters)
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