AKA: Agat;ISS EO-32. Launched: 2012-07-15. Returned: 2012-11-19. Number crew: 3 . Duration: 126.97 days.
Docked with the ISS at 04:51 GMT on 17 July. Undocked at 22:26 GMT on 18 November; landed in Kazakhstan at 01:53 GMT on 29 November.
The crew exited from the Pirs module and ejected the Sfera-53 passive air density calibration satellite into orbit using a special handling device. Sfera-53 had been delivered to the station on Progress M-16M, and has a mass of 8.0 kg and a diameter of 0.53m. The astronauts then transferred the GsTM-2 crane from Pirs to Zarya. It and the GsTM-1 crane moved in February would remain available after the Pirs module is eventually discarded. The crew installed five space debris shields, delivered on Progress M-14M in January, on the Zvezda module. A Biorisk experiment canister was returned to the station.
Attempted replacement of a failed Main Bus Switching Unit (MBSU) on the S0 truss. The failed MBSU-1 was removed from S0 and stowed temporarily at the ESP-2 outside of the Quest airlock. The STS-114 spare was removed from ESP-2 and moved to S0, becoming the 'new MBSU-1'. However, a problematic bolt stopped the astronauts completing the installation. They left the new MBSU-1 partly bolted to S0 and returned to the airlock, leaving the Station with two of its eight large solar arrays out of the main station power loop.
The crew removed the new MBSU-1, with some difficulty unjamming the critical bolt, and then spent an hour using several techniques to clean out metal shavings and foreign matter from the bolt. The installation of the new MBSU-1 was successfully carried out, and station power was mostly restored, although in the meantime the failure of the DSCU-3A box had taken down another of the arrays. The astronauts replaced a CLPA camera on the SSRMS robot arm and returned to the airlock. The old MBSU-1 remained in its temporary stowage location on ESP-2.