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Suborbital flight provides unique design considerations for Environmental Systems. The comparison of an aircraft like flow through system and a spacecraft like closed environmental system is presented. Considerations for safety aspects associated with pressure control and redundancy are also addressed.

This paper describes the development and ground-test results of three passively controlled life support systems for experiments currently onboard ISS, and scheduled for flight on STS-107 as part of the Space Media Inc. (SMI) Science and Technology Research Student (STARS®) global education program. Two experiments use the Autonomous Biological System (ABS) technology, which has been tested during two 4-month Mir experiments. One ABS will house embryos and fry of the Japanese Medaka Fish, Oryzias latipes, A second ABS contains a complex ecosystem experiment. The third system uses a passive life support system based on agar gel for the harvester ant Pogonomyrmex occidentalis. Thermal control, lighting and still and streaming digital imaging during the experiments are provided by the Generic Bioprocessing Apparatus - Isothermal Containment Module (GBA-ICM).