Sukhoi Su-30 - Development

Development

While the original Su-27 had good range, it still did not have enough range for the Soviet Air Defense Forces (PVO, as opposed to VVS – the Soviet Air Force). The Air Defense Forces needed to cover the vast expanse of the Soviet Union. Hence, development began in 1986 on the Su-27PU, an improved-capability variant of the Su-27 capable of serving as a long-range interceptor or airborne command post. The two-seat Su-27UB combat trainer was selected as the basis for the Su-27PU, because it had the performance of a single-seat Su-27 and long-range missions require two crew members. A "proof-of-concept" demonstrator flew 6 June 1987, and this success led to the kick-off of development work on two Su-27PU prototypes. The first Su-27PU flew at Irkutsk on 31 December 1989, and the first of three pre-production models flew in 14 April 1992.

To adapt the Su-27UB to its new role, the aircraft was fitted with a retractable in-flight refuelling probe to increase range; the probe is offset to the left side of the nose and, to accommodate it, the IRST was offset to the right. The aircraft's avionics were changed, fitting special communications and guidance equipment to command formation flights of single-seat Su-27 interceptors.

A Su-30M two-seat multirole variant was proposed for Russian use and a few may have been built in the mid-1990s for evaluation. Sukhoi also proposed an export variant, Su-30MK, where "MK" stood for "Modernizirovannyi Kommercheskiy" (Modernized Commercial).

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