# Proposed AD FAA-2026-4632: Pilatus Aircraft Ltd. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-17-11
- Products: Pilatus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 13, 2026, 91 FR 26949
- Comments due: June 29, 2026
- Became: [AD 2026-17-11](https://openairdocs.org/ad/2026-17-11)
- Docket: FAA-2026-4632 (https://www.regulations.gov/docket/FAA-2026-4632, where comments are filed)
- Project: MCAI-2026-00036-A
- FR document: 2026-09576
- Official PDF: https://openairdocs.org/files/sha256/35/41/35412686eba5680bbaa6965dcb8bf77ae9eb1195fb1d8402003974c417fc2c32 (from https://www.govinfo.gov/content/pkg/FR-2026-05-13/pdf/2026-09576.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/05/13/2026-09576/airworthiness-directives-pilatus-aircraft-ltd-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-09576-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-4632

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Pilatus Aircraft Ltd. (Pilatus) Model PC-24 airplanes. This proposed 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 proposed AD would require modification of the airplane and replacement of the affected SSR with a serviceable part. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 13, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-09576, comments due Jun 29, 2026 (https://www.federalregister.gov/documents/2026/05/13/2026-09576/airworthiness-directives-pilatus-aircraft-ltd-airplanes)

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