A Six-Man, Self-Contained, Electrochemical Carbon Dioxide Concentrating Subsystem (CS-6) for Space Station Prototype (SSP) use was successfully designed, fabri¬cated, and tested. The design of the unit was based on the specifications and requirements for the Environmental Control and Life Support System (EC/LSS) of the SSP.nTwo full-size mockups of the CS-6 were constructed to aid in subsystem design and packaging, with special emphasis placed on subsystem maintenance. All subsystem interfaces, whether electrical or mechanical, were designed for compat¬ibility with SSP requirements and operation. Nine different types of SSP common¬ality components were used in the design of the subsystem.nA Product Assurance Program incorporated quality assurance, reliability, maintain¬ability, safety, and material conformance. Activities included preparation of a Failure Mode Effects and Criticality Analysis (FMECA), a Fault Detection and Isolation Analysis (FDIA), a Single Point Failure Analysis (SPFA), a Safety Hazard Analysis, and Nonmetallic and Metallic Materials Lists.nGround Support Accessories (GSA) were designed to simulate interfaces for sub¬system checkout and testing. Specifically, the GSA provided electrical power, process gases, and parametric data display allowing real time indication of operating status in engineering units. A Ground Support Panel was designed and fabricated to allow for CS-6 operation without a Data Acquisition Unit (DAU) and without the computerized subsystem control provided within the SSP by the Acceptance Checkout Equipment (ACE) or Information Management System (IMS).nA test program was successfully completed which covered Shakedown Testing, Design Verification Testing (DVT), and acceptance Testing. All phases of system testing were done at SSP operating conditions with the CS-6 exceeding its design point performance prediction.nComplete subsystem documentation was prepared. It consisted of design documents (e.g., drawings, design specifications) interface documents (e.g., interface specifications), and product assurance documents (e.g., materials lists).
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