The airplane experienced an in-flight loss of engine power, which resulted in a forced landing at 0747 Eastern time. The airline transport pilot was not injured and there was no damage to the airplane. Visual conditions prevailed. The aircraft was being operated under FAR Part 135 as an unscheduled cargo flight. The airplane was climbing through 7500 feet msl when the engine seized. The pilot declared an emergency and subsequently landed in a field. Engine disassembly revealed compressor turbine blade fractures at varying heights above the platform, and downstream damage to the power turbine blades.
