General Electric has finalized the architectural design for the GEnx engine that will power Boeing’s recently launched 747-8 Intercontinental and freighter aircraft.

The completion of this milestone, referred to as “Tollgate 6″ in GE’s New Product Introduction nomenclature, begins the detailed design phase of the engine, which is the sole powerplant for the new Boeing 747-8 aircraft.

Cargolux and Nippon Cargo Airlines (NCA) ordered up to 34 747-8 freighters. Cargolux ordered 10 firm, 10 option freighters and NCA ordered eight firm, six option freighters. Deliveries will begin in 2009.

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Cutaway of Boeing's 747-8 GEnx engine