The TH-57 aircraft is the military version of the commercial Model 206 Jet Ranger helicopter manufactured by Bell Helicopter Textron, Inc. The JetRanger was initially designed to compete in a U.S. Army light observation helicopter competition. Bell lost that competition but the 206 was commercially successful. The primary mission of TH-57 is to train student naval aviators in the fundamentals of helicopter flight for their transition to operational fleet aircraft in the U. S. Navy, U. S. Marine Corps, and selected international armed forces. Although primarily used for training, these aircraft are also used for photo, chase, and utility missions. The aircraft is powered by one Allison Gas Turbine 250-C20J turboshaft engine downrated to 317 shaft horsepower.
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