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Saturday -- Stage EVA day for CDR Whitson, FE-1 Malenchenko, FE-2 Tani. Node-2 Harmony is ready to accept Columbus! EVA-12 'Charlie' was completed fully successfully in 7 hrs 4 min, accomplishing all objectives & get-ahead tasks. During the spacewalk, CDR Peggy Whitson (EV1) and FE-2 Dan Tani (EV2), supported by FE-1 Yuri Malenchenko as intravehicular (IV) crewmember, connected and configured the second half of the Node-2 fluid, power, and cooling jumpers (the first half was accomplished on EVA-11 'Bravo' on 11/20).
Removed the portside S0 truss NH3 (ammonia) shunt jumper; As a late-added task, Tani and Whitson inspected and photographed Bay 7 of the anomalous starboard (right-side) SARJ (Solar Alpha Rotary Joint). They reported metallic, magnetic contamination on the main gear bearing's outboard angled race ring, similar to debris Dan saw in Bay 12 during his inspection on 10A EVA-2, as well as pitting and abrasions on the bearing race ring but not on the gear teeth themselves. (With the Bay 7 cover remaining removed (returned onboard in a bag), the stage is set for the IMMT (ISS Mission Management Team) to consider close-up video inspections of the damage site with the SSRMS (Space Station Remote Manipulator System) cameras.) Prior to the spacewalk, FE-1 Malenchenko verified closure of the protective Lab window shutter. Malenchenko also completed the pre-egress reconfiguration of the Russian STTS (onboard telephone/telegraph subsystem) to its EVA settings. After the crew's return, Yuri reconfigured the STTS for nominal ops. (The "Voskhod-M" STTS enables telephone communications between the SM (Service Module), FGB, DC1 Docking Compartment and U.S. segment (USOS), and also with users on the ground over VHF channels selected by an operator at an SM comm panel, via STTS antennas on the SM's outside. There are six comm panels in the SM with pushbuttons for accessing any of three audio channels, plus an intercom channel. Other modes of the STTS include telegraphy (teletype), EVA voice, emergency alarms, Packet/Email, and TORU docking support.) During the spacewalk, Yuri provided IV support and prepared the DCS 760 camera setup for post-ingress photographing of the EVA gloves. CDR Whitson later downlinked the EVA imagery to the ground and reconfigured the DCS 760 for regular use (e.g., removing its thermal blanket). The FE-1 also performed the routine servicing of the SOZh system (Environment Control & Life Support System, ECLSS) in the SM (Service Module). (Regular daily SOZh maintenance consists, among else, of replacement of the KTO & KBO solid waste containers and replacement of EDV-SV waste water and EDV-U urine containers.) After returning on board from outside, Whitson and Tani doffed the EMUs, after taking photographs of the gloves and overgloves while still pressurized. As part of post-EVA tasks, the spacewalkers also reported on size fit of their EMUs and components. Later, Peggy and Dan are scheduled for another session of the standard Russian crew health-monitoring program's medical assessment MO-9/Biochemical Urinalysis, after which Yuri restowed the Urolux equipment. (MO-9 is conducted every 30 days (and also before and after EVAs) and is one of five nominal Russian medical tests adopted by NASA for U.S. crewmembers for IMG PHS (Integrated Medical Group/Periodic Health Status) evaluation as part of the "PHS/Without Blood Labs" exam. The analysis uses the sophisticated in-vitro diagnostic apparatus Urolux developed originally for the Mir program. Afterwards, the data are entered in the MEC (Medical Equipment Computer)'s special IFEP software (In-Flight Examination Program).) Additionally, both spacewalkers also had their regular post-EVA PMCs (Private Medical Conferences) with the ground. RPCM Failure: The RPC-2 (Remote Power Controller 2) switch in RPCM (RPC Module) SO-1A-D powering the Node-2 ammonia (NH3) umbilical survival heaters failed to close after two tries. If the cause is found to be a failed hybrid FET (Field Effect Transistor) as has been seen before, R&R (removal & replacement) of the RPCM is required. (These heaters are needed only if the NH3 loop is shut down.) No CEO (Crew Earth Observation) photo targets uplinked for today.
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