The Socata ST-10 Diplomate was a French four-seat civil light aircraft. It was a development of the GY-80 Horizon and was initially known as the Super Horizon 200 later the Provence before finally being named the ST-10 Diplomate. The first prototype flew on 7 November 1967 production beginning in 1970. Production ended in 1974 with a total of 55 built.
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