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The Neutral Buoyancy risk abatement test was conducted at the Marshall Space Flight Center (MSFC) Neutral Buoyancy Simulator facility during June and July 1995. The purpose of this neutral buoyancy simulation was to evaluate the crew interfaces associated with intra-vehicular activity (IVA) and extravehicular activity (EVA) operations for the International Space Station (ISS) Product Group-3 (PG-3) hardware. There were seven test objectives evaluated during the 1995 NBS test; three EVA and four IVA. The IVA tasks included two Carbon Dioxide Removal Assembly (CDRA) maintenance evaluations, a Fluid System Servicer (FSS) operation evaluation and an Active Rack Isolation System (ARIS) rack installation/removal demonstration. The two CDRA maintenance tasks were removal and replacement of the upper rear heater controller Orbital Replaceable Unit (ORU) and removal and replacement of the rear Desiccant/Adsorbent (D/A) bed ORU.

Boeing is responsible for Space Station Freedom (Work Package (WP) 01) which includes the Habitat and U.S. Laboratory modules, which includes the integration of the Environmental Control and Life Support System (ECLSS). Included as part of the ECLSS is the Atmosphere Revitalization (AR) subsystem. The AR subsystem provides for removal of metabolic carbon dioxide, removal of trace contaminants, and continuous monitoring of the cabin atmosphere major constituent composition during the Manned Tended Configuration (MTC) phase of station operations. The focus of this paper is on the Carbon Dioxide Removal Assembly (CDRA) flight design aspects of the Space Station Freedom (SSF) AR subsystem. A Four Bed Molecular Sieve (4BMS) has been selected by Boeing as the CDRA for SSF. The CDRA removes carbon dioxide from an air slip stream pulled from the Cabin Air Temperature & Humidity Control (THC) assembly.