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It competed against the Antonov An-28 and the Czechoslovakian LET-410, and claims were made that it didn't become the standard plane in this size due to political reasons within the COMECON trading bloc. The original design featured interconnected engines, so that in case of one engine failing, the remaining engine could drive both propellers, though this was not implemented in the production version. The first prototype flew on 3 March 1967, fitted with Shvetsov ASh-21 piston engines, while the first production prototype flew on 18 July 1968, using more powerful Glushenkov TVD-10 turboprop engines. The first deliveries to Aeroflot were in mid-1969. |
