Hartzell’s basic overhaul strategy is focused on dealing with the effects of corrosion, erosion, wear and fatigue. In the overhaul process, corrosion is identified and removed. The incorporation of factory new finishes prevents wear and erosion. And identification and removal of stress risers, which can cause fatigue, are also a significant part of the process. In short, the overhaul method is designed to ensure the continued safe operation and high level of performance that you expect from Hartzell.
Depending on the condition of the prop, the typical overhaul consists of over 200 separate operations from disassembly and initial inspection through re-assembly and balancing. All metal blades are completely stripped, inspected, reworked, and factory anodized prior to primer and refinishing.
Hubs
Just like the blades, hub components are stripped, inspected and reworked. Seals and
consumable hardware are replaced with genuine Hartzell parts. In all cases, components
receive either factory new anodizing or factory new plating. Additional procedures such as
shot-peening are accomplished in the same manner as they’re performed at the Hartzell
factory. Craftsmanship in the overall process is exceptional. In fact, it is virtually
impossible to tell the difference between a new part and one refinished at the Service
Center.
Upon completion of the overhaul of each part, the prop is re-assembled and statically balanced on computerized equipment. When re-installed on your aircraft, Hartzell can perform a dynamic balance, which match balances the prop system with the rotating systems of the engine. The reduced vibration resulting from dynamic balancing can make a tremendous difference in interior cabin comfort levels and reduce wear on the airframe and instruments.
