Blackhawk Launches STC Program for Hartzell 5-Blade Composite Propeller Paired with XP67A Engine+ Upgrade on the King Air 350

Lakeland, FL – April 1, 2025 – Blackhawk is, once again, redefining King Air 350 performance with the launch of a new Supplemental Type Certificate (STC) program that pairs Hartzell Propeller’s advanced 5-blade composite propeller with Blackhawk’s high-performance XP67A Engine+ Upgrade. This powerful combination delivers speed, efficiency, and operational value for King Air 350 operators. 

Hartzell’s 5-blade composite propeller features industry-leading carbon fiber construction, engineered for lighter weight, increased durability, and enhanced performance compared to the standard 4-blade aluminum propeller. By adding an additional blade, operators will save approximately 10 pounds per side, or about 20 pounds in total weight savings.  

Further, the 5-blade offers a reduced diameter, which lowers the noise characteristics of the propellers. Operators can expect shorter takeoff distances, faster climb rates, and improved cruise speeds—all while benefiting from smoother operation, reduced cabin noise, and lower maintenance demands. 

A Proven Performance Boost 

At the heart of this upgrade is Blackhawk’s XP67A Engine+ Upgrade, which replaces factory-installed Pratt & Whitney Canada (P&WC) PT6A-60A engines with more-powerful PT6A-67A powerplants. The engines alone offer a 24% increase in available horsepower, which unlocks maximum cruise speeds over 332 KTAS and climbs to FL350 in under 17 minutes. 

“This new STC program highlights our passion to pursue next-level performance solutions,” said Edwin Black, President of Blackhawk. “By integrating Hartzell’s cutting-edge propeller with our proven XP67A engine upgrade, we’re providing King Air 350 operators with additional propeller options resulting in a personalized path to smarter, faster, more efficient flying—with significant operational savings.” 

Proven Durability, Maximum Uptime 

Hartzell’s composite blades have been flight-proven across global fleets, with over 50,000 hours of service, unlimited blade life, and extensive testing that includes 20 lightning strike simulations and 200+ bird strike impact tests. Their low-noise, lightweight design not only boosts comfort but also improves fuel efficiency. 

Upgrade Value Without the Cost of a New Aircraft 

The STC provides an efficient, cost-effective pathway to upgrade performance sustaining legacy aircraft models without having to purchasing a new airframe. In fact, Blackhawk-modified King Airs often sell at or above the combined value of the airframe and upgrade, delivering strong ROI for owners. 

For King Air 350 operators seeking jet-like performance at turboprop cost, this newly certified pairing sets a new standard in aftermarket aircraft performance. 

Certification of the Hartzell 5-blade/XP67A King Air 350 pairing is slated to be announced at EAA AirVenture 2025. Call Blackhawk today to secure your delivery position. 

For more information, visit the Blackhawk booth this week at Sun N Fun Aerospace Expo in Lakeland, FL, visit www.blackhawk.aero, or call +1 254 755 6711.