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Space Station: Possible Repair Space Walks

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NASA Works Towards Dec. 19 Cygnus Launch; Possible Repair Space Walks

NASA engineers continued efforts Sunday to regulate temperatures in one of two cooling loops on the International Space Station affected by the malfunction last week of a flow control valve in a cooling pump on the station’s starboard truss. A Flow Control Valve in the starboard Pump Module that enables the flow of ammonia to cool station systems stopped positioning itself properly last Wednesday, resulting in a drop of temperature in Cooling Loop A. That necessitated the shutdown of some support systems on the station. The temperature must be warm enough in the cooling lines to allow the system’s heat exchangers to dissipate excess heat from the station through the external radiators on the complex. The primary heat rejection capability for station systems shifted last week to Cooling Loop B that uses a fully operational Pump Module on the port truss.

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