The decision means that
Instead, a pair of US astronauts will embark on three spacewalks that culminate on
"They will replace it with an existing spare that is stored on an external stowage platform."
Attempts to fix the problem from the ground were apparently not enough to allow the Orbital mission to berth at the research outpost to unload supplies.
The six-man crew was never in danger due to the problem, but
The company did a demonstration launch and berthing at the ISS in September, showing it was capable of the mission and paving the way for more supply trips.
Both companies have lucrative contracts with the US space agency to ferry supplies to the ISS.
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