# Airworthiness Directives; Leonardo S.p.a. Helicopters
> **Rule** · Final rule; request for comments. · Published 2021-09-08 · Effective 2021-09-23 · 86 FR 50239
## Document
- **Document number:** 2021-19248
- **Category:** airworthiness
- **Manufacturer:** Leonardo S.p.a.
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 86 FR 50239
- **Publication date:** 2021-09-08
- **Effective date:** 2021-09-23
- **FAA docket:** Docket No. FAA-2021-0607
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Leonardo S.p.a. Model AB412 and AB412 EP helicopters. This AD was prompted by a report of the failure of both inverters in-flight, leading to an autopilot disconnection. This AD requires a one-time inspection of the clearance between a certain protective grommet installed in the emergency bus interlock compartment and the cable assemblies passing through it, and depending on the finding, applicable corrective actions, 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/2021/09/08/2021-19248/airworthiness-directives-leonardo-spa-helicopters)
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