In an interview with the newspaper
Izvestia, S7 Group founder
Vladislav Filev announced the creation of a four-seater composite aircraft, as well as accompanying piston engine. On 21 September 2024, the first flight of a prototype Tango aircraft took place at the S7 Group's airfield at Torbeyevo, located south of
Moscow. The flight was conducted by test pilot Vladimir Barsuk from the
Chaplygin Siberian Scientific Research Institute Of Aviation (SibNIA). While the production engine remains in development, a
Belgian ULPower Aero Engines UL520iS was used as a substitute. During the Innoprom-2025 exhibition in July 2025, Spectra Aircraft CEO Alexander Stepanov announced that operational tests were planned to be complete by the end of the year, with certification beginning in 2026. On 24 December 2025 an updated prototype took flight, where performance and flight characteristics were checked. As a result of design optimisation, this aircraft had improved aerodynamic performance. It was further noted that testing of the APD-520 "Leader" engine was underway. In March 2026, both prototype aircraft underwent flight testing in
Novosibirsk. == Specifications ==