The Power 90 Upgrade Program is a conversion program for owners of King Air 90, in which the installed engines are replaced with the powerful 705 shp GE M601E-11A engines.
Owners of King Air C90 aircraft who take advantage of the Power 90 Upgrade Program and upgrade engines to the GE M601E-11A engine will gain ".significantly increased operating efficiency, reduced variable costs, and net savings." according to a July 2010 study by Conklin & de Decker performed for GE Aviation. The comparative analysis of the GE engine against its competition was acknowledged by Vref, which recently recognized 100 percent of the conversion cost in the value added to a C90 when the GE engine upgrade was selected.
