Repairing of Kristall isolation

Preparation work for new setting of solar cells

Mounting Zvezda connections

They disconnected and stowed cables from Destiny to PMA 2, removed cover on Node 2 (Harmony) forward docking mechanism, demated avionics cables and released fluid tray bolts. They performed also a temporary stow of CETA light on Destiny and configured cables for power transfer for S0 truss/Node1/Zvezda and PMA 1/Zarya. At least they retrieved the Baseband Signal Processor from Z1 truss and released bolts on P1 Nitrogen Tank Assembly. Originally it was the planned fifth EVA-work of the STS-120 crew

The cosmonauts moved a Strela-2 cargo boom from the Pirs docking compartment to the Zarya module. This allows Pirs to be undocked at a later date making room for the new Russian multipurpose laboratory. Other tasks included releasing a small satellite and installing debris shields.

The spacewalkers performed works with the experiment Test at two locations: they took away samples from the outer surface of the docking compartment Pirs hatch and in the area of the cover window #8 at the service module Zvezda. Goal of the experiments is to develop methods for detecting leaks and control of elements of the exterior surface of the ISS.
The cosmonauts also dismantled a monoblock responsible for exposing samples of organic and biological materials in open space (experiment Expose-R) and set the unit samples #2 from an experiment for the study of space influence on the mechanical properties of materials. At the same module, they had to replace a removable cassette container, where the samples are placed of the exterior of stations in conditions of prolonged exposure, change the orientation of the pressure control unit on the module Poisk.
One of the important tasks were works on an experiment with the goal to develop technologies for sticking film thermal control coating, secure package screen-vacuum thermal insulation on the surface to be repaired and transactions that require bonding film materials in space flight.
For more convenient travel on the outer surface of the ISS the spacewalkers installed handrails on the soft part of the conical device of the Functional Cargo Block Zarya. Upon completion of the main tasks the cosmonauts started a photo documentation of the external surface of the ISS Russian segment.