page_title: Jack D. Fischer
section_title: Expedition 51/52
hierarchical_section_title: Jack D. Fischer / NASA career / Expedition 51/52
caption_attribution_description: English: Air Force colonel and NASA astronaut Jack Fischer works outside the U.S. Destiny laboratory module to attach wireless antennas during the 201st spacewalk in support of International Space Station maintenance and assembly. This was a short and unplanned, contingency spacewalk whose primary task was the removal and replacement of a failed computer data relay box that controls the functionality of important station components such as solar arrays and radiators.
context_page_description: Jack David Fischer is an American engineer, test pilot and a former NASA astronaut. Fischer was selected in June 2009 as a member of the NASA Astronaut Group 20 and qualified as an astronaut in 2011. He made his first spaceflight in April 2017, as a flight engineer for Expedition 51/52 on the International Space Station.
context_section_description: Originally assigned to the Expedition 52/53 crew, he was reassigned to launch aboard Soyuz MS-04 to the ISS in April 2017 as a flight engineer for Expedition 51/52.
  Fischer launched aboard MS-04 on April 20, 2017. They docked with the station approximately 6 hours after launch, being the first crew of a Soyuz-MS series to make the shorter 6 hour rendezvous instead of the 2 day orbital rendezvous of the previous launches.
  On May 13, 2017, Fischer performed his first career EVA with Peggy Whitson. The EVA was shortened due to an issue ahead of the spacewalk where the spacewalkers had to share a SCU (Service Cooling Unit) line after the umbilical for Fischer's EMU suffered from a leak. His suit was in good shape, but the line could not be used. The impact on the EMU battery life meant the full EVA duration couldn't be conducted. They replaced an avionics box on the starboard truss called an ExPRESS Logistics Carrier (ELC), a storage platform. The duration was 4 hours and 13 minutes, and it was the 200th EVA to be performed on the ISS.
  On May 23, 2017, Fischer performed his second EVA with Whitson. They replaced a backup multiplexer-demultiplexer (MDM) unit that had failed on May 20, 2017. The duration was 2 hours and 46 minutes.
  Fischer returned to Earth along with Peggy Whitson and Fyodor Yurchikhin aboard Soyuz MS-04 on September 3, 2017. The overall duration of his stay in space was 135 days, 18 hours and 8 minutes.
  On May 24, 2018, he announced his early retirement from NASA to return to Air Force Service.
caption: Fischer during an EVA in 2017
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