Reliable Engine. The Raven's dependable Lycoming O-540 engine (Raven I) and IO-540 engine (Raven II) are derated for long life and unmatched reliability.

Patented Rotor Design. Robinson's patented tri-hinge rotor eliminates lag hinges, dampers, and hydraulic struts. Stainless steel main rotor blades resist corrosion and have thick leading edges to minimize erosion.

Inspections. No scheduled maintenance, other than oil changes, required between 100-hour inspections.

Lubrication. Teflon-lined, elastomeric, and sealed bearings eliminate most lubrication requirements.

Couplings. Maintenance-free flexible couplings are used in place of universal joints or gear couplings in the main and tail drive systems.

Controls. Primary controls are actuated by maintenance-free bellcranks and push-pull tubes, eliminating the need for control cables and pulleys.

Time-Between-Overhaul. 2200 hours or twelve years approved time-between-overhaul period for the R44 engine and airframe. All life-limited components have approved service lives of at least 2200 hours.

Worldwide Service. Factory-trained technicians at more than 280 service centers throughout the world use certified Robinson parts and tools to provide quality service for R44 helicopters.