# Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
> **Rule** · Final rule. · Published 2026-09-15 · Effective 2026-10-20 · 91 FR 58364
## Document
- **Document number:** 2026-18848
- **Category:** airworthiness
- **Manufacturer:** Pilatus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 58364
- **Publication date:** 2026-09-15
- **Effective date:** 2026-10-20
- **FAA docket:** Docket No. FAA-2026-4632
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Pilatus Aircraft Ltd. (Pilatus) Model PC-24 airplanes. This AD was prompted by a report that a solid-state relay (SSR) used in the left-hand (LH) windshield heating system may allow reverse current flow when in the OFF position. This AD requires modification of the airplane and replacement of the affected SSR with a serviceable part. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/09/15/2026-18848/airworthiness-directives-pilatus-aircraft-ltd-airplanes)
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