ISS ECLSS: 3Years of Logistics for Maintenance

The International Space Station (ISS) Environmental Control and Life Support System (ECLSS) is designed to be maintainable. During the 3 years since the ISS US Lab became operational, there have been numerous ECLSS Orbital Replacement Units (ORU’s) launched and returned to maintain the ECLSS operation in the US segments. The maintenance logistics have provided tools for maintenance, replaced limited life ORU’s and failed ORU’s, upgraded ECLSS hardware to improve reliability and placed critical spares onboard prior to need. In most cases, the removed ORU’s have been returned for either failure analysis and repair or refurbishment. This paper describes the ECLSS manifesting history and maintenance events and quantifies the numbers of ECLSS items, weights, and volumes.