# Airworthiness Directives; Airbus Helicopters
> **Rule** · Final rule. · Published 2020-11-02 · Effective 2020-12-07 · 85 FR 69131
## Document
- **Document number:** 2020-23977
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 69131
- **Publication date:** 2020-11-02
- **Effective date:** 2020-12-07
- **FAA docket:** Docket No. FAA-2020-0618
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Airbus Helicopters Model AS-365N2, AS 365 N3, EC 155B, EC155B1, and SA- 365N1 helicopters. This AD requires inspecting the tail rotor gearbox (TGB) housing recess, and depending on the inspection results, performing more in-depth inspections and removing certain parts from service. This AD also prohibits installing a TGB unless it has passed certain inspections and has a new TGB control rod bearing installed. This AD was prompted by the discovery of a foreign object obstructing the oil duct of a TGB control bearing. The actions of this AD are intended to address an unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/11/02/2020-23977/airworthiness-directives-airbus-helicopters)
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