# Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
> **Rule** · Final rule; request for comments. · Published 2026-04-24 · Effective 2026-05-11 · 91 FR 21952
## Document
- **Document number:** 2026-08022
- **Category:** airworthiness
- **Manufacturer:** Pilatus
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 91 FR 21952
- **Publication date:** 2026-04-24
- **Effective date:** 2026-05-11
- **FAA docket:** Docket No. FAA-2026-3862
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Pilatus Aircraft Ltd. (Pilatus) Model PC-12/47G airplanes. This AD was prompted by a report that a brake shuttle valve (BSV) on a production airplane shuttled and isolated the brake line to the left- hand (LH) brake, which resulted in brake lockup. This AD requires replacement of the LH and right-hand (RH) brake pipe assemblies and also prohibits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/04/24/2026-08022/airworthiness-directives-pilatus-aircraft-ltd-airplanes)
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