A significant part of the FAA’s Modernization of Special Airworthiness Certification (MOSAIC) rule officially takes effect today, marking a major shift in how light sport aircraft and sport pilot privileges are defined. The rule expands what sport pilots can fly, removing the previous weight restriction and introducing stall speed limits instead.

Beginning today, sport pilots can operate airplanes with any max airspeed (though new LSAs will be capped at 250 kcas, once aircraft certification standards change next year), with up to four seats and with clean stall speeds of 59 kcas—though they may still carry only one passenger, and only aircraft meeting the new stall-speed and configuration limits qualify. In practice, this means many, but not all, four-seat models may be eligible under spo

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