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Third TKS flight that would have docked with the cancelled Almaz OPS 4 military space station. The spacecraft was instead flown unmanned to Salyut 7 as Cosmos 1686. For that mission the VA reentry capsule was retained but stripped of its heat shield and all recovery equpment. In their place military optical test sensors (infrared telescope and Ozon spectrometer) were installed.
Manned three crew. Docked with Salyut 7. Transported a crew consisting of ship's commander L D Kizim, flight engineer V A Solovyov and cosmonaut-research O Y Atkov to the SALYUT-7 orbital station to conduct scientific and technical studies and experiments. Returned crew of Soyuz T-11 to Earth. Recovered April 11, 1984 10:50 GMT. Landed 160 km E Dzehezkazgan.
Docked with Salyut 7. Transported a crew comprising ship's commander V A Dzhanibekov, flight engineer S E Savitskaya and cosmonaut-research I P Volk to the Salyut-7 orbital station to conduct scientific and technical studies and experiments. Recovered July 29, 1984 12:55 GMT.
Planned but cancelled manned flight to Salyut 7. Breakdown of Salyut 7 led to cancellation of this flight and its replacement by the Soyuz T-13 repair mission. Savinykh served on the repair mission while Vasyutin and Volkov flew on Soyuz T-14.
Docked with Salyut 7. Transported a crew comprising ship's commander V V Vasyutin, flight engineer G M Grechko and cosmonaut-researcher A A Volkov to the Salyut-7 orbital station to conduct scientific and technical studies and experiments. Grechko returned in Soyuz T-13 on 25 September 1985 - emergency return.