At Southeast Aerospace, an overhaul of a KI-256 involves a complete teardown of the unit replacing all bearings and worn or defective parts. To maximize the service life of the rotor bearings after they are replaced, the rotor is initially balanced to within tolerance. They are then run-in for a minimum of 52 hours while rebalancing the rotor during and after the run-in period. All work is also performed at Southeast Aerospace in our ISO class 8 certified clean room to prevent contamination during buildup and alignment of the instrument. Upon completion of alignment to factory specs and required test procedures, the KI-256 is then run on the Scorsby table for a minimum of two more hours for quality assurance.