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Overnight, engineers conducted testing with a component in the Pump Module called a Radiator Return Valve, which is a ball valve that operates in concert with the suspect Flow Control Valve in the pump to control heating in the cooling lines to the Interface Heat Exchangers. The Radiator Return Valve was commanded to various positions to see how the Flow Control Valve might be placed in a fixed position to help actively control cooling loop A, and in turn, allow the system to warm up sufficiently so that the heat exchangers in the loop can operate at a proper temperature. Engineers continue to pore over the data and other techniques to manage the flow control valve. The cooling of station systems is currently being managed through cooling loop B that employs a pump module on the port truss. In the meantime, Expedition 38 crewmembers Rick Mastracchio and Michael Hopkins worked Saturday in the Quest airlock to begin preparing their spacesuits in the event they are called upon to conduct spacewalks to change out the faulty pump module. If managers direct the crewmembers to perform those spacewalks beginning late next week, the launch of the Orbital-1 mission would be delayed until January.
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