The Russian Federal Space Agency, Roscosmos, is preparing for the launch of three new crewmembers to the International Space Station aboard the Soyuz MS-05 vehicle. Liftoff is scheduled for 15:41 GMT (11:41 EDT; 17:41 CEST) from the Baikonur Cosmodrome in Kazakhstan to begin a fast-tracked, four-orbit rendezvous with the Station. If all goes to plan, the MS-05 crew will dock to the ISS at 22:00 GMT (18:00 EDT; 00:00 CEST on 29 July).
Soyuz MS-05 – returning the Station to six crew:
Soyuz MS-05 will represent the 134th flight of a crewed Soyuz vehicle and the 60th launch of the Soyuz-FG rocket since it entered service in 2001.
Specifically, the mission will utilize Soyuz spacecraft No. 736. Originally, MS-05 was to use spacecraft No. 735 and launch on 29 May 2017; however, in January, technicians discovered that the original Soyuz for MS-04, No. 734, had a leak in its thermal control system, SOTR.
The timeline to fix No. 734 would not allow its use until September, prompting Roscosmos to advance No. 735 to MS-04 and No. 736 to MS-05.
However, No. 736’s processing timeline would only allow it to be advanced from its original September readiness date to 28 July.