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The SM, the second Russian-built ISS module, is intended for housing a crew of up to six people. Externally, it resembles the Mir core module, consisting of three pressurized compartments (intermediate, working and intermediate chamber) and one non-pressurized (housing the united powerplant system). The SM has four docking ports, including two on the fore-and-aft axis. One of these ports will provide docking with the FGB. The upper docking port on the intermediate compartment will provide an attachment point for the Scientific Power Platform. The USM will be attached to the lower docking port. The remaining port is intended for docking with expandable crew vehicles and cargo ships. The set of systems installed on the SM allows it to fulfill control functions over systems of other ISS elements, such as gathering and sending telemetric information to the Earth. It also provides "Earth-ISS" and "ISS-Earth" radio communications via Altair relay satellites, as well as power supply for the whole station, orbit correction, orientation of the station in space and space walks for astronauts through the hatches (until the arrival of the Docking Compartment). Vital data: Weight in orbit: 20,660 kg Dimensions: length: 13 m maximum diameter: 4.15 m (Russian ISS Modules, Vladimir Karnozov, Launchspace Publications, 1998)
Details of DMS-R subsystem (data mgmt sys98.pdf)
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Service Module's two crew compartments |
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The Service Module being manufactured at Khrunichev in Moscow. This view is of the aft end airlock. The module is mounted on rotating rings to allow the module to be rotated easing work.
The Service Module being manufactured at Khrunichev in Moscow.
The Service Module being manufactured at Khrunichev in Moscow. Many subsystems have been installed and interior outfitting is at an advanced state.
The Service Module at Khrunichev in Moscow ready for transfer to RKK Energia for further outfitting and testing.
The Service Module undergows systems testing.
Rear of Service Module, Altair antenna
The Service Module used a 14 day period to check out its systems before positioning to dock with the ISS. During the period, propulsion, power, control, and communications systems were tested to confirm their functions before joining to the ISS. Checkout before docking simplified testing as much as possible by ruling out the effects of ISS systems on the Service Module after it docked.
Zvezda's main engines were used to perform several maneuvers to place the module within 5 KM of the ISS. Then, the FGB will tow Node-1 to a docking with the Service Module passively waiting in place, maintaining its attitude pointing toward the approaching ISS using the well proved Kursautomatic docking system.
In case of a automated docking failure, a crew of cosmonauts were prepared to fly to the Service module in a Soyuz TM to activate necessary systems, install a TORU remote control docking system and piolt the FGB to a docking while within the Service Module.
Images from NASA, ESA, NASDA, CSA, RSA
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