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Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer will venture outside the outpost in their spacesuits to replace an avionics box that routes command and data information to external science experiments.

This will be the 200th spacewalk in support of International Space Station assembly and maintenance, the ninth for Whitson and first for Fischer.

Earlier Event: April 10
Soyuz MS-02 undocking, landing
Later Event: June 2
Soyuz MS-03 undocking and landing