They replaced a fluid flow regulator on the Russian segment’s Zarya module. They also removed the Photon-Gamma unit of the Molina-Gamma experiment, which measures gamma splashes and optical radiation during terrestrial lightning and thunder conditions, from a portable workstation on Zvezda.

They continued routing power and Ethernet cables for the future arrival of the Russian Multipurpose Laboratory Module, which will be launched aboard a Proton rocket from the Baikonur Cosmodrome in Kazakhstan. They also installed on the Poisk module a panel of experiments designed to collect data on the effects of the microgravity environment in low-Earth orbit.

The cosmonauts removed a space laser communications system from the hull of the Zvezda service module and planned to install a pointing platform on which a small optical telescope will be installed on a future Russian spacewalk. This task failed.