# Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter Deutschland GmbH and Eurocopter Canada Ltd.) Helicopters
> **Rule** · Final rule. · Published 2021-03-26 · Effective 2021-04-30 · 86 FR 16041
## Document
- **Document number:** 2021-06205
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 16041
- **Publication date:** 2021-03-26
- **Effective date:** 2021-04-30
- **FAA docket:** Docket No. FAA-2020-0696
## Abstract

The FAA is superseding Airworthiness Directive (AD) 97-26-02 for Eurocopter Deutschland GmbH Model BO-105A, BO-105C, BO-105S, BO- 105LS A-1, and BO-105LS A-3 helicopters; and Eurocopter Canada Ltd. Model BO-105LS A-3 helicopters. AD 97-26-02 required a repetitive visual inspection for cracks in the ribbed area of the main rotor (M/R) mast flange (flange), and depending on the outcome, replacing the M/R mast. This new AD retains the requirements of AD 97-26-02 and removes the reinforced M/R mast from the applicability. This AD was prompted by the determination that a certain reinforced M/R mast is not affected by the unsafe condition. The actions of this AD are intended to address an unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/03/26/2021-06205/airworthiness-directives-airbus-helicopters-deutschland-gmbh-type-certificate-previously-held-by)
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