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.