Foto de stock - This NASA Dryden Flight Research Center photograph taken in 1975 shows the General Dynamic IPCS/F_111E Aardvark with a camouflage paint pattern. This prototype F_111E was used during the flight testing of the Integrated Propulsion Control System IPCS. The wings of the IPCS/F_111E are swept back to near 60 degrees for supersonic flight.During the same period as F_111 TACT program, an F_111E Aardvark 67_0115 was flown at the NASA Flight Research Center to investigate an electronic versus a conventional hydro_mechanical controlled engine. The program called integrated propulsion control system IPCS was a joint effort by NASA’s Lewis Research Center and Flight Research Center, the Air Force’s Flight Propulsion Laboratory and the Boeing, Honeywell and Pratt & Whitney companies. The left engine of the F_111E was selected for modification to an all electronic system. A Pratt & Whitney TF30_P_9 engine was modified and extensively laboratory, and ground_tested before installation into the F_111E. There were 14 IPCS flights made from 1975 through 1976. The flight demonstration program proved an engine could be controlled electronically, leading to a more efficient Digital Electronic Engine Control System flown in the F_15.