In late 1987, the Garrett Engine Division of the Allied-Signal Aerospace Company contracted with Embraer of Sao Jose, Brazil to build a modern free-turbine turboprop to power the new 19-passenger CBA-123 commuter aircraft. Designated the TPF351-20, this 2100 thermodynamic shp turboprop was developed using proven components from other new engine designs. It was the first Garrett turboprop to incorporate full authority digital electronic control (FADEC) and provide advanced component technologies to yield optimum powerplant efficiencies. A great deal of effort was expended on maintainability features including individual mechanical component accessibility and FADEC diagnostic capabilities. Since each new aircraft powerplant installation requires special consideration of overall aircraft design goals and specific physical limitations, this paper discusses both the CBA-123 powerplant installation development as it relates to the pusher engine configuration and the engineering studies involved in meeting the basic design goals of the aircraft.