On 17 Dec 2015 the Mobile Transporter carrying Canadarm-2 robot arm became jammed on the rail on worksite due to a jammed brake on an attached cart. As the jammed robot arm was deemed a safety issue, an unscheduled spacewalk was ordered. Astronauts Scott Kelly and Tim Kopra commenced their EVA at 1245 GMT on 21 December 2015 and successfully fixed the jammed cart. The EVA lasted three hours and 16 minutes.
Need to fix robot arm transporter results in extra spacewalk on ISS
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