Elastomeric bearings in the main rotor eliminate the need for lubrication. The tail rotor is bearingless. Composites widely used in skins, panels, cowls, nose assembly and certain structural elements - keep corrosion low. Interchangeable main rotor blades are constructed of a titanium spar and fiberglass skin. The airframe is designed for a limitless lifetime and exceeds FAA structural requirements.
Exceptional durability is also part of the design.
This translates into low cost of maintenance materials. More specifically, it means a high time between scheduled maintenance, and high lifetime for parts - both those on scheduled replacement, and those that can be overhauled. In fact, only 9 components have a retirement lifetime of less that 6,000 hours - the equivalent of ten years in a typical EMS operation. Thanks to its durability, S-76 aircraft that have been used for other missions regularly come onto the market. With refitting and refurbishing, they can be made like new.