FAA Orders Pilatus Pilots to Patch Stall Warning Glitch
Published Date: 6/9/2026
Rule
Summary
Pilatus PC-12/47E airplane owners need to update their stall warning system software and add a temporary pilot handbook revision by July 14, 2026. This fix stops the stall warning from going off at the wrong times, keeping flights safer. The FAA also bans installing the old, faulty software, so pilots should act fast to avoid any trouble or extra costs.
Analyzed Economic Effects
2 provisions identified: 0 benefits, 2 costs, 0 mixed.
Mandatory software update and POH revision
If you own or operate a Pilatus PC-12/47E (serial numbers 1720 and 2001 through 2476), you must update the Honeywell Primus APEX operational software and insert POH Temporary Revision No. 32 by July 14, 2026. The FAA estimates the software update takes 3 work-hours (3 x $85 = $255) and the POH revision takes 1 work-hour ($85); the FAA estimates 265 U.S. airplanes are affected (software cost to U.S. operators = $67,575; POH revision cost = $22,525).
Ban on installing affected (old) software
The rule prohibits installing the affected (faulty) operational software on the same Pilatus PC-12/47E airplanes; operators must not reinstall the older software covered by EASA AD 2025-0271. The prohibition is part of the AD effective July 14, 2026, and is intended to prevent inappropriate activation of the stall warning protection system (SWPS).
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