A Soyuz spacecraft consists of three parts (from front to back):
The orbital and service modules are single-use and are destroyed upon re-entry in the atmosphere. The orbital and reentry portions are habitable living space.
Soyuz can carry up to three crew members and provide life support for about 30 person days. The life support system provides a nitrogen/oxygen atmosphere at sea level partial pressures. The atmosphere is regenerated through KO 2 cylinders, which absorb most of the CO 2 and water produced by the crew and regenerates the oxygen, and LiOH cylinders which absorb leftover CO 2.
The vehicle is protected during launch by a payload fairing , which is jettisoned along with the SAS at 2-1/2 minutes into launch. It has an automatic docking system. The ship can be operated automatically, or by a pilot independently of ground control.
Since it turned out to be almost impossible to separate the entire payload shroud from the Soyuz service module cleanly, the decision was made to have the shroud split between the service module and descent module during an abort. Four folding stabilizers were added to improve aerodynamic stability during descent. Two test runs of the SAS were carried out in 1966-67.
Soyuz craft carrying ISS duo lands in Kazakhstan - 1:16
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