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The Environmental Control and Life Support System (ECLSS) for both MPLM and APM is developed by Dornier. One of the main ECLSS functions to be realized is the atmosphere pressure control of the module. It includes the Cabin Depressurisation, the Positive Pressure Relief, and the Negative Pressure Relief. In order to verify the functionality of the atmosphere pressure control system (ACS) analyses of different scenarios have to be performed. The analysis method including the governing equations of the three ACS functions is described. The analyses are performed with a Dornier developed software program that solves the set of equations numerically. The results of the analyses in terms of pressure and temperature transients are presented and discussed with respect to the boundary conditions and the influence of humidity.

The Mini Pressurized Logistics Module (MPLM) is being developed as the Italian contribution to the International Space Station (ISS) Programme. To improve the efficiency of European space programmes, the Italian Space Agency (ASI) and the European Space Agency (ESA) have decided to increase the commonality between the MPLM and the Columbus Orbital Facility (COF), the European laboratory contribution to the ISS. As a result ASI will provide to ESA a primary structure of the MPLM to be used as the primary structure for COF; in return ESA will provide to ASI the ECLS subsystem for the MPLM, which is a subset of the COF ECLS subsystem. This paper describes the functions of the MPLM ECLS subsystem, the analytical and developmental activities performed by the ECLS Contractor, Daimler-Benz Aerospace Dornier GmbH, and the development status of the various ECLS equipment.