# Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters
> **Rule** · Final rule. · Published 2019-04-02 · Effective 2019-05-07 · 84 FR 12486
## Document
- **Document number:** 2019-06022
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 84 FR 12486
- **Publication date:** 2019-04-02
- **Effective date:** 2019-05-07
- **FAA docket:** Docket No. FAA-2017-1085
## Abstract

We are adopting a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH (Airbus Helicopters) Model MBB-BK 117 A-1, MBB-BK 117A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, MBB-BK 117 C-1, and MBB-BK 117 C-2 helicopters. This AD requires repetitive inspections of the tail rotor (T/R) gearbox housing. This AD was prompted by a report that a crack was found in a T/R gearbox housing. The actions of this AD are intended to correct an unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/04/02/2019-06022/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters)
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