# Airworthiness Directives; Bell Helicopter Textron Inc. Helicopters
> **Rule** · Final rule. · Published 2020-02-11 · Effective 2020-03-17 · 85 FR 7653
## Document
- **Document number:** 2020-02587
- **Category:** airworthiness
- **Manufacturer:** Bell Helicopter Textron Inc.
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 7653
- **Publication date:** 2020-02-11
- **Effective date:** 2020-03-17
- **FAA docket:** Docket No. FAA-2017-0052
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2015-04-04 for Bell Helicopter Textron Inc. (Bell) Model 412 and 412EP helicopters. AD 2015-04-04 required revising the Rotorcraft Flight Manual (RFM) for your helicopter and installing a placard to limit flights to visual flight rules (VFR) and prohibit night operations because of failing inverters. This AD requires replacing the affected inverter with a new inverter. This AD was prompted by numerous failures of inverters. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/02/11/2020-02587/airworthiness-directives-bell-helicopter-textron-inc-helicopters)
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