# Airworthiness Directives; Airbus Helicopters
> **Rule** · Final rule. · Published 2018-09-25 · Effective 2018-10-30 · 83 FR 48366
## Document
- **Document number:** 2018-20487
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 48366
- **Publication date:** 2018-09-25
- **Effective date:** 2018-10-30
- **FAA docket:** Docket No. FAA-2018-0438
## Abstract

We are adopting a new airworthiness directive (AD) for Airbus Helicopters Model AS355E, AS355F, AS355F1, AS355F2, and AS355N helicopters. This AD requires measuring a vibration level in the tail rotor (T/R) drive. This AD was prompted by reports of bearing degradation. The actions of this AD are intended to prevent an unsafe condition on these helicopters.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/09/25/2018-20487/airworthiness-directives-airbus-helicopters)
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