...GE continues its research and development of engines for next-generation narrowbody planes. Donnelly said GE's corporate research team has been looking at powerplant advances for about five years, and a team on the company's aviation business side has been devoted to systems and architecture for about two years.
GE has no plans to scale down the GEnx to create a new narrowbody engine, noting the GEnx's two-stage, high-pressure turbine (HPT) would result in more parts and higher maintenance costs than the single-stage HPTs on narrowbody powerplants. Donnelly explained that GE would take some of the composite technology used in the GEnx's fan blades and fan case and apply that to the new narrowbody design...
Apparently, Mr. Donnelly didn't make a projection as to when a sufficiently advanced powerplant would be available for the OEM's to go forward with the next generation of narrowbodies.