The limited number of fatigue critical parts, the long overhaul intervals, and the low maintenance hour/flight hour ratio resulting from high reliability and easy maintenance combine to yield low operating and support costs. There are only 9 life limited parts on the 280FX. Everything else, including rotor blades, is replaced on an on-condition basis. Transmission overhauls are available on an exchange basis so that the parts can be changed out in the field with a minimum of downtime. There is no life limit on the 280FX airframe. The 280FX can be fully serviced by any PART-145 organization or licensed mechanic.