For those of us who have been flying for a while, we remember PTS slow flight. The FAA recently rewrote these procedures and now call them the Airman Certification Standards. In the video below Jason lets you see and helps you learn how to perform the new ACS slow flight. According to the ACS, for slow flight the pilot should establish and maintain an airspeed at which any further increase in angle of attack, increase in load factor, or reduction in power, would result in a stall warning (e.g., aircraft buffet, stall horn, etc.). The maneuver should not activate the stall warning system at all if it is properly performed. And if the stall warner goes off, a student is expected to promptly recover from the impending stall.