 The aircraft is essentially a stock Cessna 208 airframe that has been stretched by with structural reinforcement, powered by twin Pratt & Whitney Canada PT6D-114A engines in a side-by-side Dual Pac configuration in place of the original single engine.Soloy modified a Cessna 208 to construct a prototype Pathfinder 21, with its first flight in 1995.The Dual Pac PT6D-114A engine used in the Pathfinder 21 gained its FAA Supplemental Type Certificate in 1997.