Soyuz T-4 was the 14th mission to visit the Salyut 6 space station and carried the EO-6 expedition, which was the final long-duration crew for the station. The mission began on March 12, 1981, 19:00:11 UTC, launching Commander Vladimir Kovalyonok and Flight Engineer Viktor Savinykh into orbit. They docked with the station the next day. During their 74-day stay on the station, EO-6 crew conducted various experiments, and were visited by Soyuz 39 and Soyuz 40 crews. The mission concluded with a safe landing back on Earth on May 26, 1981, 12:37:34 UTC.
Soyuz T-4 was a Soyuz spacecraft which launched on 12 March 1981 19:00 UTC. It transported two cosmonauts of EO-6 to Salyut 6. The crew was Vladimir Kovalyonok and Viktor Savinykh.Soyuz T Details
The Roscosmos State Corporation for Space Activities, commonly known as Roscosmos, is the governmental body responsible for the space science program of the Russian Federation and general aerospace research. Soyuz has many launch locations the Russian sites are Baikonur, Plesetsk and Vostochny however Ariane also purchases the vehicle and launches it from French Guiana.INFO WIKI