According to NASA, the fault was caused by a bent disconnect pin of the disconnect contact sensor, which was damaged during assembly of the strap-on amplifier. This could prevent a nozzle cover from opening and opening an amplifier. As a result, it reached the core phase and triggered the decompression that rocket out of control.
The Soyuz has been successfully launched four times since the accident. But only one of these launches was in the same version of the missile that failed on October 1
NASA will broadcast the procedure live from 5.30pm (ET), with launch from Baikonur Cosmodrome taking place in Kazakhstan an hour later. Astronauts Anne McClain of NASA, David Saint-Jacques of the Canadian Space Agency and Oleg Kononenkoof of Roscosmos will be the crew of the Soyuz.
The trio's six-hour journey takes four hours before docking the rocket to the ISS's Poisk module at 12.35. It will take almost two hours for the crew to enter the station, where they will be greeted by the current crew (Expedition 57). Kononenko, McClain and Saint-Jacques then become the Expedition 58 crew when the current ISS residents go to Earth on 20 December.