DATABASES Signal 435
ISS spacewalkers abort antenna replacement after bolts and connections resist removal
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Astronauts removed a faulty ISS antenna but could not install its replacement due to stubborn hardware
Orbital repairs demonstrate that even routine maintenance in space is constrained by physical access and time limits. Engineers planning extra-vehicular activity must budget for unexpected mechanical resistance and electrical snags that cannot be debugged remotely.
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Astronauts removed a failed space-to-ground antenna but ran out of time before installing its replacement
Stubborn bolts and electrical connections extended the job beyond the planned duration
A follow-up spacewalk is needed to complete the task and restore full redundancy
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Two astronauts attempted to swap a failed space-to-ground antenna on the ISS. The job was expected to be straightforward: remove the old unit, install a spare, and stow the broken hardware. Instead, disconnecting electrical cables and loosening bolts took far longer than planned, leaving no time to mount the new antenna before the spacewalk window closed.
The incident highlights the gap between ground-based repair estimates and orbital reality. On Earth, a technician can apply more force, swap tools, or pause to troubleshoot. In microgravity, every motion is constrained by suit mobility, tether reach, and the finite life-support reserves. What appears as a simple mechanical task becomes a race against consumables and orbital night.
Redundancy is the operational rule on the ISS. The station retains a second operational antenna, so communications are not at risk. However, the failed unit must still be replaced to restore full fault tolerance. The next scheduled spacewalk may or may not include the unfinished work, forcing mission planners to juggle priorities while the spare hardware remains exposed to the space environment.
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