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The FGB-2 is a backup copy to the first element of the International Space Station -- the Zarya control module launched in November 1998. The first of two sibling spacecraft -- Zarya FGB control module -- was built by Moscow-based Khrunichev Enterprise under contract with the Boeing company. Although the agreement funded only a single vehicle, Khrunichev used spare parts and its own funds to build a backup module, in case the original, known by its Russian abbreviation as FGB, failed in a launch mishap or upon reaching orbit. By the time Zarya/FGB-1, successfully docked to the Zvezda service module in July 2000, the FGB-2 module was about 65 percent ready, according to Khrunichev. At that point, Russian space officials considered several potential new roles for the craft in the ISS program, including its use as a heavy supply ship for the Russian segment of the station. In mid-2000, Boeing announced that it had partnered with Khrunichev to "commercialize" the FGB-2. The move put Khrunichev/Boeing team on a collision course with RKK Energia and Spacehab, who at the end of 1999 claimed the same docking port on the ISS (nadir or Earth-facing docking port on the Zarya module) for their Enterprise module. A new role for FGB-2 Posted: 2001 August 10 During 2001, in an effort to save money on the virtually stalled development of the Russian segment of the International Space Station, ISS, Khrunichev proposed to use the FGB-2 spacecraft as a base for Universal Docking Module, UDM. The UDM would serve as a hub for up to three Russian research modules; however, work on the UDM module all but stopped due to lack of funds. The concept of using the FGB-2 as a Universal Docking Module had been considered in previous years, however the amount of work required for modifying the module for the task would have not justify the effort. For example, the transfer compartment on FGB-2 had to be repositioned and equipped with three additional docking ports to receive future science modules. However by 2001, Khrunichev officials argued that in light of the financial situation at the time, Russia had no chance of building all its science modules during the station lifetime. According to Khrunichev, it would be enough to add a single docking port to the FGB-2 in order for it to serve as the Universal Docking Module. In August 2001, Khrunichev and RKK Energia -- the main Russian contractor on the ISS -- reportedly agreed on the use of the FGB-2 as the Universal Docking Module. According to that plan, the FGB-2 module would dock to the Earth-facing (nadir) port on the Zvezda service module, i.e. the same port where the UDM module was expected to dock. Such a configuration would leave the "nadir" port on the Zarya module for the RKK Energia's proposed Enterprise module. In addition to the new docking port, the FGB-2's solar panels and a number of other systems would have to be modified, in order for the spacecraft to serve as a replacement for the UDM. Khrunichev representatives said that the FGB-2 could be prepared for launch within two years after a decision on its mission had been made. As of 2004, the launch of the FGB-2 module to the ISS was scheduled for 2007. Multipurpose Laboratory Module, MLM On November 3, 2006, RKK Energia and the Russian space agency, Roskosmos, signed a contract calling for the development of the Multipurpose Laboratory Module, MLM. At the time, work on the module was expected to start in 2007, and its launch was targeted for 2009. By the beginning of 2008, the launch date of the MLM slipped to 2011. In the new configuration, the MLM module would accommodate both service systems for the Russian segment of the ISS and scientific payloads. The European-built ERA manipulator and the DMS-R multifunction computer would also be installed onboard. A special automated airlock for moving payloads from the interior of the station to the vacuum of space would be installed on the lower section of MLM. To be delivered into space by the Proton rocket, the module would have an initial mass of 20,700 kilograms and provide 70 cubic meters of pressurized volume. Around eight cubic meters would be available for cargo storage and the same volume would be left for the installation of the scientific payloads. The module would sport a total of 12 workstations for various instruments and experiments. Special incubators and vibration-protected platforms for sensitive material-science research would be available. Prior to the MLM launch, the Docking Compartment-1, which had occupied the nadir (Earth-facing) docking port of the Zvezda service module, was to be discarded along with a departing Progress cargo ship. It would then be directed to the Earth atmosphere to burn up. The MLM would then use its own engines to rendezvous with the station and dock to the freed nadir port on Zvezda. Node module Around a year or two after the MLM arrival to the station, a 4,000-kilogram ball-shaped Node module would be docked to the outer end of the MLM. Launched with a modified Progress cargo ship, the Node module, would carry up to a ton of payload on its way to the station. The element would provide five docking ports for additional elements of the Russian segment, including a nadir port for the docking of the Soyuz and Progress transport ships. Two side docking ports on the Node modules would be reserved for twin Science and Power Modules.
Page author and photography: Anatoly Zak; Last update: October 21, 2008 Page Editor: Alain Chabot; Last edit: October 21, 2008 All rights reserved |
PICTURE GALLERY
The FGB-2 module, minus its solar panels, sits in the assembly shop at Khrunichev enterprise in Moscow in August 2001. Protective red boxes cover attitude control engines. Copyright © 2001 Anatoly Zak
The FGB-2's docking adapter in its original configuration. Additional docking ports would have to be installed on the section to adapt the module for the new role of the Universal Docking Module, UDM. By 2008, developers decided to add a special Node module to that section to enable further expansion of the Russian segment. Copyright © 2001 Anatoly Zak
The interior of the FGB-2 module viewed from the docking adapter section toward the front docking port. Copyright © 2001 Anatoly Zak
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