# Federal Register #2026-18848

FAA Airworthiness Directive for Pilatus PC-24: Windshield Relay Modification and Replacement

**Buyer:** Federal Aviation Administration
**Posted:** September 15, 2026
**Identifier:** 2026-18848
**NAICS:** 336413

This notice from the Federal Aviation Administration (FAA) addresses a safety issue affecting Pilatus PC-24 airplanes.
- Government Buyer:
  - Federal Aviation Administration (FAA), Transportation Department
- OEM Highlight:
  - Pilatus Aircraft Ltd. is the Original Equipment Manufacturer (OEM) for the affected PC-24 airplanes
- Products/Services Requested:
  - Modification and replacement of the solid-state relay (SSR) in the left-hand windshield heating system
  - Estimated 168 U.S.-registered airplanes affected
  - No specific part numbers provided
- Unique Requirements:
  - The SSR must be replaced to prevent reverse current flow, which could cause failure of the emergency windshield heat function and loss of outside visibility
  - Compliance procedures reference European Union Aviation Safety Agency (EASA) AD 20260008
  - Estimated cost per airplane ranges from $244.50 to $1,457
- This is a regulatory airworthiness directive, not a procurement solicitation or contract award

### Description

The FAA is adopting a new airworthiness directive for certain Pilatus Model PC-24 airplanes due to a report of a solid-state relay issue in the left-hand windshield heating system that may allow reverse current flow when in the OFF position. This condition could cause failure of the emergency windshield heat function, potentially resulting in loss of outside visibility. The directive requires modification of the airplane and replacement of the affected relay with a serviceable part to address this unsafe condition. The AD is effective October 20, 2026.

[View original listing](https://www.federalregister.gov/documents/2026/09/15/2026-18848/airworthiness-directives-pilatus-aircraft-ltd-airplanes)