Prokopyev’s spacesuit was the troublemaker, exhibiting faulty pumps connected to its cooling system, according to Russian state-run TASS news agency.
“An abnormal operation of pumps in the cooling system of one of the spacesuits has been found in the process of preparing the spacesuits for the extravehicular activity,” Roscosmos said in a statement.
Prokopyev and Petelin were lined up to relocate a heat exchanger, or radiator, from the Rassvet mini-research module to the Nauka module.
The newly installed European robotic arm was to assist with the task, with cosmonaut Anna Kikina at the controls.
This project began on November 17, when the spacewalkers prepped the heat exchanger for its relocation.
The heat exchanger is required to “remove extra thermal loads from the Nauka multipurpose laboratory module during scientific experiments,” TASS explained.
More: The Coolest — and Most Frightening — Spacewalks in History.
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