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.
In the new configuration, the MLM module would accommodate 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.
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.
By the beginning of 2008, the launch date of the MLM slipped from 2009 to 2011. Until May 2009, the MLM was promised to take off in December 2011. During a May 29 press-conference at the mission control in Korolev, Aleksei Krasnov, the head of manned space flight at Roskosmos said that launch was expected in the first quarter of 2012. However in the October 2009 NASA schedule, the mission was still marked for launch in December 2011.
In August 2011, the Director General of GKNPTs Khrunichev, Vladimir Nesterov, said that a prototype of the MLM module designed for electrical tests would be delivered to RKK Energia before the end of the month, despite technical issues associated with changes in the module's design documentation. (503) Around the same time, industry sources said that an integrated prototype of the MLM module had already been delivered to RKK Energia and was in process of being hooked up to the integrated prototype of the Russian segment.
By the fall of 2011, the launch of the module was postponed from December 2012 to June 2013, as the earliest. By 2012, the launch slipped further to 2014.
Work in 2012-2014
By the end of August 2012, GKNPTs Khrunichev completed the installation of the ERA robotic arm and onboard cable lines on the MLM module. The thermal control, hydraulics and pneumatic systems had been tested and solar panels had been installed, the company announced on September 3.
On September 21, GKNPTs Khrunichev completed assembly of the payload section for the MLM mission, including the module itself, its protective fairing and an adapter ring designed to serve as an interface between the spacecraft and the Proton launch vehicle. The operation would test all mechanical interfaces, check electrical systems and pneumatic pushers, the company announced. This work would be followed by the weighing of the module and vacuum tests.
A fully assembled flight version of the module would then be shipped to RKK Energia for further electrical tests, GKNPTs Khrunichev said. As of the beginning of September, the transfer of the spacecraft to RKK Energia was promised to take place in October, or two months behind a previous schedule, however it had to be delayed even further.
A critical transfer from the Moscow's district of Fili to Korolev started on the night from December 6 to December 7, 2012. From December 7 to December 14, a joint team of specialists from GKNPTs Khrunichev and RKK Energia unloaded the module from the railway car and installed it at the processing site in the main hall of the RKK Energia's Checkout and Testing Building, KIS, the company announced. According to RKK Energia, the upcoming work included autonomous and integrated tests of the module, including joint trials with ground equivalents of other Russian ISS modules as well as Progress and Soyuz transport ships. The MLM module was christened Nauka a Russian word for "science."
According to a schedule approved by RKK Energia leadership on October 24, 2012, the launch of the MLM Nauka module was scheduled for Dec. 11, 2013, enabling a docking of the spacecraft to the Zvezda Service Module on the Russian segment of the station nine days later. However according to industry sources at the time, MLM was not likely to lift off before 2014.
2013: MLM module faces lengthy delays
During 2013, the launch of the MLM module was re-scheduled to April and then to June 2014. In the meantime, tests of the MLM at RKK Energia revealed a leaking fueling valve in the propulsion system of the spacecraft. The damage was serious enough to require a complex procedure of cutting away the valve and welding in a new one. Before committing to the repairs, engineers had to practice it on a full-scale prototype of the MLM module known in Russian as Kompleksny Stend, KS.
Further inspections of MLM at RKK Energia apparently found contamination inside the propulsion system, which would require a lengthy cleaning. According to some reports, it would take up to 10 months to resolve all the issues with the spacecraft.
As a result, it was decided to return the MLM back to GKNPTs Khrunichev for repairs. On Oct. 22, 2013, the Interfax news agency reported that all the repairs at GKNPTs Khrunichev would take a year and a half to complete. According to a poster on the online forum of the Novosti Kosmonavtiki magazine, latest plans called for the launch of the MLM module in September 2015. The head of RKK Energia Vitaly Lopota told the RIA Novosti news agency that no decision for the return of the module back to GKNPTs Khrunichev had been made yet. At the same time, Lopota admitted that he had not certified the spacecraft for launch.
To make matters worse, the European Space Agency, ESA, responsible for the ERA mechanical arm onboard the MLM module reportedly had enough with all the delays and resulting cost overruns. ESA reportedly refused funding for the program beginning from 2014 onwards. As a result, the Russian government would likely have to pick up the tab for all further cost increases in the project.
By the end of 2013, NASA documents indicated that the MLM module would not fly before November 2015.
2014: From bad to worse
On Jan. 10, 2014, the head of RKK Energia Vitaly Lopota told the official ITAR-TASS news agency that the MLM module had been returned to GKNPTs Khrunichev on Dec. 31, 2013. Lopota promised that the repair schedule for the spacecraft would be issued by the end of the month. However only in April, Lopota was able to estimate that fixing all the damage to the crippled module would take no less than nine months, while its exact processing schedule would not be set until the end of the month. By that time, the launch of the MLM in 2015 was practically ruled out. To save at least some time, plans were made to ship the MLM from GKNPTs Khrunichev directly to the launch site, letting RKK Energia to conduct all final tests of the spacecraft in Baikonur, instead of its testing facility in Korolev, near Moscow.
On April 26, a poster on the web forum of the Novosti Kosmonavtiki magazine reported that the new development schedule had been approved, targeting February 2017 for the launch of the module. The tanks of the spacecraft were found to be unaffected by the contamination, however almost all propellant lines running on the exterior of the module would have to be replaced. Moreover, the module's engines had already exceeded their warranty and had to be replaced as well. The manufacturing of the new propulsion systems would take up to eight months, the poster said.
With its central position in the architecture of the Russian segment, the MLM's troubles also stall the launch of all subsequent Russian components of the station, including the Node Module, UM, (already under construction) and the NEM laboratory and power supply module, whose full-scale development started in 2012.
Given such a prolonged delay, combined with worsening political relations between Russia and its partners in the ISS project, the questions were raised whether the MLM module and the successive components of the Russian segment could be grounded until the assembly of the new all-Russian station in the post-ISS era. Under such a scenario, the troubled spacecraft could play a role of an early hub for the future orbital outpost. These speculations were reinforced by a statement of the Russian Vice-Prime Minister Dmitry Rogozin in 2014 that Russia would pull out from the ISS project in 2020.
2015: Some certainty
In November 2014, officials cited the launch of the MLM module to the ISS in the first quarter of 2017, however the station's flight manifest surfaced in April 2015 indicated the launch in the middle of 2017. Fortunately, by that time, the Russian space program reacquired some focus after several months of uncertainty.
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