# Airworthiness Directives; Airbus Helicopters
> **Rule** · Final rule; request for comments. · Published 2023-12-28 · Effective 2024-01-12 · 88 FR 89568
## Document
- **Document number:** 2023-28720
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 88 FR 89568
- **Publication date:** 2023-12-28
- **Effective date:** 2024-01-12
- **FAA docket:** Docket No. FAA-2023-2396
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2022-27- 09, which applied to certain Airbus Helicopters Model EC130T2 helicopters. AD 2022-27-09 required repetitively inspecting the vibration level on the tail rotor drive shaft and, depending on the results, taking corrective action. AD 2022-27-09 also required reporting information and prohibited installing certain rotor drive shafts unless the inspection was done. Since the FAA issued AD 2022-27- 09, Airbus Helicopters revised its service information to update the procedures for inspecting that vibration level, reduce an allowable vibration level, and clarify when a balance correction may be accomplished. This AD was prompted by the determination that a certain vibration measurement tool was providing unexpected results and therefore the threshold must be revised. This AD continues to require certain actions in AD 2022-27-09 and also revises the procedures for inspecting the vibration level on the tail rotor drive shaft and depending on these results, requires replacing certain parts, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/12/28/2023-28720/airworthiness-directives-airbus-helicopters)
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