"Houston, we have a working comm link again."
Thanks to the efforts of two astronauts, such a call is possible again using one of two Space-to-Ground antennas outside the International Space Station (ISS). The pair finished the replacement of a faulty dish assembly during a spacewalk on Tuesday (Aug. 25).
Anil Menon of NASA and Sophie Adenot of the European Space Agency (ESA), who previously removed a faulty dish during a spacewalk on Aug. 18, installed a spare in its place and moved the broken assembly from a temporary to more permanent storage location along the station's backbone truss.
With Menon positioned at the end of the Canadarm2 robotic arm and Adenot traversing by handrails to join him, the two Expedition 75 crewmates first retrieved a spare Space-to-Ground Antenna (SGANT) from an external stowage position. Menon and the spare dish were then maneuvered to the Z-1 truss, where it was mounted and connected to the station's power and data systems.
Menon and Adenot then retrieved the faulty antenna, which they had stowed on the Z-1 truss during the prior spacewalk. Menon (on the arm) moved it to external stowage platform-3 (ESP-3) on the starboard side of the truss.
The replacement work became necessary after the SGANT ceased being able to track NASA's data and relay satellites, rendering it unusable, beginning last November. A second antenna has been in use since, continuing the transmission of voice and critical data, but this repair re-established redundancy to the system.
"On behalf of CAPCOM and I, we're going to count down like a bolt: '3, 2, 1… You just saved the video dish, you just saved the video dish,'" sang astronaut Anne McClain from Mission Control at NASA's Johnson Space Center in Houston, parodying the The Buggles' 1979 hit "Video Killed the Radio Star."
"Oh my god, it is hard to top that," replied Menon, who could be heard laughing along with Adenot. "I want to thank the entire team on executing this complex, time-critical operation successfully."
Tuesday's spacewalk began at 8:27 a.m. EDT (1227 GMT) and was completed exactly 6.5 hours later, at 2:57 p.m. EDT (1857 GMT).
The extravehicular activity (EVA) was the 283rd in support of ISS assembly, maintenance and upgrades. It was Menon's third EVA, increasing his total spacewalking time to 19 hours and 20 minutes. It was the second time that Adenot worked in the vacuum of space, raising her time on EVA to 12 hours and 53 minutes after becoming the first woman and fifth citizen of France to perform a spacewalk.
This was the sixth outing from the International Space Station this year, the second EVA for Expedition 75 and the 98th spacewalk using U.S. extravehicular mobility unit (EMU) spacesuits at the station.
