 Soloy was attempting to obtain FAA certification for the aircraft conversion, but after completing over 80% of the certification work, Soloy announced that it was halting the entire program.The CEO explained that the FAA requires aircraft with more than nine passengers to have the airframe meet tougher restrictions required by Federal Aviation Regulation (FAR) Part 25, which is a practical impossibility, since the Cessna 208 does not meet those requirements.This requirement makes marketing the airplane unfeasible, as the expanded passenger cabin is a major reason for the stretch to begin with.