At the back of the vehicle is the Service Module (Russian: прибо́рно-агрега́тный отсе́к, tr.
pribórno-agregátny otsék).
It has a pressurized container shaped like a bulging can (instrumentation compartment, priborniy otsek) that contains systems for temperature control, electric power supply, long-range radio communications, radio telemetry, and instruments for orientation and control.
A non-pressurized part of the Service Module (propulsion compartment, agregatniy otsek) contains the main engine and a liquid-fuelled propulsion system for maneuvering in orbit and initiating the descent back to Earth.
The ship also has a system of low-thrust engines for orientation, attached to the intermediate compartment (perekhodnoi otsek).
Outside the Service Module are the sensors for the orientation system and the solar array, which is oriented towards the Sun by rotating the ship.
An incomplete separation between the Service and reentry modules led to emergency situations during Soyuz 5, Soyuz TMA-10 and Soyuz TMA-11, which led to an incorrect reentry orientation (crew ingress hatch first).
The failure of several explosive bolts did not cut the connection between the service and reentry modules on the latter two flights.
At the back of the vehicle is the Service Module (Russian: прибо́рно-агрега́тный отсе́к, tr. pribórno-agregátny otsék). It has a pressurized container shaped like a bulging can (instrumentation compartment, priborniy otsek) that contains systems for temperature control, electric power supply, long-range radio communications, radio telemetry, and instruments for orientation and control. A non-pressurized part of the Service Module (propulsion compartment, agregatniy otsek) contains the main engine and a liquid-fuelled propulsion system for maneuvering in orbit and initiating the descent back to Earth. The ship also has a system of low-thrust engines for orientation, attached to the intermediate compartment (perekhodnoi otsek). Outside the Service Module are the sensors for the orientation system and the solar array, which is oriented towards the Sun by rotating the ship. An incomplete separation between the Service and reentry modules led to emergency situations during Soyuz 5, Soyuz TMA-10 and Soyuz TMA-11, which led to an incorrect reentry orientation (crew ingress hatch first). The failure of several explosive bolts did not cut the connection between the service and reentry modules on the latter two flights.
Soyuz (spacecraft)