# Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
> **Rule** · Final rule. · Published 2022-05-10 · Effective 2022-06-14 · 87 FR 27923
## Document
- **Document number:** 2022-09815
- **Category:** airworthiness
- **Manufacturer:** Pilatus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 87 FR 27923
- **Publication date:** 2022-05-10
- **Effective date:** 2022-06-14
- **FAA docket:** Docket No. FAA-2022-0084
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Pilatus Aircraft Ltd. (Pilatus) Model PC-24 airplanes. This AD was prompted by a failure of the dual ethernet communication channel on a dual-channel data concentration and processing unit, which triggered the opening of electronic circuit breakers that caused several unintended system activations. This AD requires installing a software (SW) upgrade to the utility management system (UMS), 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/2022/05/10/2022-09815/airworthiness-directives-pilatus-aircraft-ltd-airplanes)
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