T63 / 250 Allison general motors turbine engine
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The Model T63 / 250 propels a large number of helicopters, small aircraft and even a motorcycle. As a result, nearly 30,000 Model 250 engines have been produced. Of these, approximately 16,000 of these remain in service. The Model 250 is one of the highest-selling engines ever made by Rolls-Royce/ General Motors / Allison. Dependable, reliable, and timeless in many ways.