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Avionics Air Cooling (AAC), because of a distributed system approach, provides for individually tuned equipment heat removal configurations. Airborne heat loads reject to the moderate temperature Internal Thermal Control System (ITCS). With selectable fan speed and ITCS flow, the cooling system with associated distribution ducting provides cooling and circulation in non-habitable zones. This selectivity as well as packaging considerations within the rack, potential fire detection responsibilities and varied pressure drops added to the air return of the system present a challenge to the user. Air balancing recommendations and an analysis of the hardware and its selectability defines the full range of operation to meet these responsibilities and provides a common procedure for test. This paper will address the overall air balancing recommendations and orifice plate techniques necessary for the user to perform system optimization.

The Space Station Freedom (SSF) Environmental Control and Life Support System (ECLSS) Atmosphere Revitalization (AR) subsystem conditions the cabin atmosphere to provide a safe habitable environment for the 4-person astronaut crew. The first phase of the ECLSS development testing, namely the AR POST, focuses on the SSF Man Tended Capability (MTC) configuration. The scheduled 34-day integrated AR POST was conducted by Boeing at Marshall Space Flight Center (MSFC) Building 4755, Huntsville, Alabama and completed March 21, 1992. A test timeline is presented in Figure 1. This test was the first time the three baselined ECLSS Man Tended Capability (MTC) AR assemblies were integrated and operated in a closed door chamber in which the internal atmosphere was monitored. This paper details the initial results of the Integrated AR POST. Future considerations for the Integrated Single String POST are also discussed.