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[b]ISS Expedition 66: U.S. Spacewalk 78[/b] Two NASA astronauts will venture outside of the International Space Station on Tuesday (Nov. 30), for a spacewalk to replace a faulty antenna system. Expedition 66 crewmates Tom Marshburn and Kayla Barron will exit the Quest airlock around 7:10 a.m. EST (1210 GMT) to replace an S-band Antenna Subassembly (SASA) with a spare already available on the station's truss structure. The space station transmits low-rate voice and data with flight controllers on the ground over the S-band of radio frequencies. The spacewalk is expected to take about six hours and 30 minutes to complete. Marshburn and Barron will work at the Port 1 (P1) truss structure, where the antenna is mounted. The antenna recently lost its ability to send signals to Earth via NASA's Tracking and Data Relay Satellite System (TDRSS). Although its degradation has had limited impact on station operations, mission managers decided to install a new antenna to ensure communications redundancy. The space station has additional low-rate S-band systems, as well as the high-rate KU-band communications system that relays video. Throughout the spacewalk, Marshburn will position himself at the end of the Canadarm2 robotic arm, working in tandem with Barron. Astronaut Matthias Maurer of the European Space Agency (ESA) will control the arm from inside the station. Marshburn will serve as extravehicular crew member 1 (EV1), with red stripes on his spacesuit, while Barron will be extravehicular crew member 2 (EV2), with an unmarked suit. This will be the fifth spacewalk for Marshburn, the first spacewalk for Barron, and the station's 245th spacewalk in support of assembly, maintenance and upgrades.
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