Federal Register #2026-11528

FAA Airworthiness Directive: Pilatus PC-12/47E Software Update and Handbook Revision

The Federal Aviation Administration (FAA) has issued a regulatory airworthiness directive (AD) for Pilatus PC-12/47E airplanes to address a safety issue with the stall warning protection system (SWPS). - Government Buyer: - Federal Aviation Administration (FAA), Aircraft Certification Service, Airworthiness Products Section, Operational Safety Branch - OEMs Involved: - Pilatus Aircraft Ltd. (airframe manufacturer) - Honeywell (software developer) - Products/Services Required: - Update of Honeywell Primus APEX operational software on 265 Pilatus PC-12/47E aircraft - Incorporation of Pilatus PC-12/47E Pilot's Operating Handbook (POH) Temporary Revision No. 32 - Notable Requirements: - Applies to Pilatus PC-12/47E airplanes with serial numbers 1720 and 2001-2476 - Prohibits installation of affected software versions - Requires recordkeeping by pilots - References EASA AD 2025-0271 for compliance details - No procurement of products or services is being solicited; this is a regulatory compliance action.

Description

This final rule airworthiness directive (AD) issued by the Federal Aviation Administration (FAA) addresses an unsafe condition in certain Pilatus Model PC-12/47E airplanes. The AD requires updating the operational software and incorporating a temporary revision to the pilot's operating handbook (POH) to prevent inappropriate activation of the stall warning protection system (SWPS). It also prohibits the installation of affected software to ensure flight safety. The AD is effective July 14, 2026, and affects 265 airplanes registered in the U.S.

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