Program Joins STC And Aftermarket Propeller Options Into One Comprehensive Solution Hartzell Propeller, a Signia Aerospace company, is expanding its commitment to the general aviation community in 2026—making high-performance propeller upgrades more accessible, more affordable, and easier to navigate than ever before. Through a major expansion of its popular Top Prop conversion program, Hartzell unlocks a new upgrade path for thousands of aircraft owners. With more than 150 additional propeller models now included, pilots have greater access to both aluminum and advanced carbon fiber propellers designed to deliver improved performance, efficiency, and durability.
