“This STC approval is a major step forward for King Air 350 operators looking to elevate performance without buying a new airframe. By pairing Hartzell’s composite propeller with our XP67A upgrade, we are delivering a powerful, efficient solution with strong ROI.” Source: Edwin Black, President of Blackhawk’s Proprietary Upgrades division, commenting as the Blackhawk Group and Hartzell Propeller announced they received the FAA Supplemental Type Certificate approval for the integration of the Blackhawk XP67A Engine+ Upgrade paired with Hartzell’s advanced 5-blade composite propeller on the Beechcraft King Air 350.