WASHINGTON, June 9 (TNSFR) -- The U.S. Department of Transportation Federal Aviation Administration has adopted an airworthiness directive affecting certain Pilatus Aircraft Ltd. model PC-12/47E airplanes after reports that the stall warning protection system activated when it was not expected. Pilatus Aircraft Ltd., Stans, Switzerland, must undergo operational software updates and revisions to flight manuals to address a condition that regulators said could reduce safety margins and increase pi . . .

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