 TMA-12M was the 121st flight of a Soyuz spacecraft since the first in 1967 and the 38th Soyuz mission to the ISS.After a successful launch on 25 March 2014, docking was scheduled to occur on 26 March via the relatively new six-hour duration orbital trajectory.In the event, one of the orbital burns scheduled to refine the trajectory did not occur as planned, due to an attitude control problem in which the spacecraft was incorrectly oriented.