# Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Previously Eurocopter Deutschland GmbH) Helicopters
> **Rule** · Final rule. · Published 2019-03-13 · Effective 2019-04-17 · 84 FR 8963
## Document
- **Document number:** 2019-04530
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 84 FR 8963
- **Publication date:** 2019-03-13
- **Effective date:** 2019-04-17
- **FAA docket:** Docket No. FAA-2017-1126
## Abstract

We are superseding Airworthiness Directive (AD) 97-26-03 for Eurocopter Deutschland GmbH Model MBB-BK 117 A-1, MBB-BK 117 A-3, MBB- BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, and MBB-BK 117 C-1 helicopters. AD 97-26-03 required visual inspections for cracks in the ribbed area of the main rotor (M/R) mast flange (flange). Since we issued AD 97-26-03, we have determined that a certain reinforced M/R mast is not affected by the unsafe condition. This new AD retains the requirements of AD 97-26-03 and removes a certain M/R mast from the applicability. The actions of this AD are intended to address an unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/03/13/2019-04530/airworthiness-directives-airbus-helicopters-deutschland-gmbh-previously-eurocopter-deutschland-gmbh)
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