![]() The -550 has reduced maintenance when compared to the turbocharged 206s, and fewer crankcase cracks than the IO-520-F. The IO-550-F, which includes an automatic, altitude-compensating fuel pump and beefed-up crankcase, was another engine option that had no time limitations on its maximum power rating and offered greater propeller efficiency, more pulling power, lower noise levels, reduced airframe vibrations, and limited prop tip erosion. The turbocharged engine received another upgrade in 1977 when the 310-hp TSIO-520-M engine was introduced. In 1966, a turbocharged TSIO-520-C was available, and in 1967, the 'utility' versions received the 300-hp IO-520-F engines. ![]() ![]() In 1964 the 206 arrived: 205 airframe, 15 additional horsepower thanks to the 285-hp Continental IO-520 engine. ![]()
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