# Airworthiness Directives; Airbus Helicopters
> **Rule** · Final rule. · Published 2021-03-11 · Effective 2021-04-15 · 86 FR 13805
## Document
- **Document number:** 2021-05089
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 13805
- **Publication date:** 2021-03-11
- **Effective date:** 2021-04-15
- **FAA docket:** Docket No. FAA-2020-0974
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model EC 155B and EC155B1 helicopters. This AD was prompted by a report that non-destructive tests of the main gearbox (MGB) housing may have been evaluated incorrectly during production. This AD requires replacing affected MGBs with serviceable MGBs, 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/2021/03/11/2021-05089/airworthiness-directives-airbus-helicopters)
---
*AI Analytics · CC0 1.0*