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[i]The ETCS is not to be confused with the Photovoltaic Thermal Control System (PVTCS), which is completely separate from the ETCS and is used only to cool the solar arrays and associated power generation equipment, and not the main ISS structure, cooling for which is provided by the ETCS. The current FCV issue is located within ETCS loop A, and thus has no relation whatsoever to the Pump Flow Control Subassembly (PFCS) leak and associated replacement earlier this year, as that issue related to the PVTCS only.[/i]
[i]However, complicating matters is that EVAs are currently suspended following a water leak inside Italian astronaut Luca Parmitano’s spacesuit helmet during an EVA in July, an event which could easily have led to him drowning. The leak occurred inside Extravehicular Mobility Unit (EMU) number 3011... NASA had been planning to wait to return EMU 3011 to Earth aboard a SpaceX Dragon vehicle and deliver a new EMU in its place before clearing EVAs to resume, however the next Dragon vehicle is not scheduled to arrive at the ISS until at least late February next year.[/i]
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