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S3 zenith outboard PAS deploy postponed on account of time constraints. The retrieval of an exterior service plate on Columbus was deferred to another shuttle mission due to time constraints after problems have been encountered with attaching the outdated ammonia tank to a provider within the payload bay, vapeelectronique and a number of other other tasks had been deferred to later EVAs as a result of replanning from the problems with the mission's second EVA. Prepared for the alternative of an empty ammonia tank on the station's port truss by releasing its bolts.

Fincke additionally installed grapple bars on the port radiators. Additional completed tasks included putting in HD Video Cameras on the port/outboard side of the station (one zenith, one nadir), applying extra torque to SARJ bolts, photographing the inside of the SARJ, tying back a protective blanket protecting hardware which will probably be robotically manipulated later, and tying back Crew and Equipment Translation Aid (CETA) Cart brake handles to keep them out of the SARJ rotation envelope.

Completed cleansing and lubrication of all but one of many trundle bearing assemblies (TBA) on the starboard SARJ. Completed replacement of trundle bearing assemblies on starboard SARJ, lubricated the port SARJ, installed a video digicam, re-put in insulation covers on the Kibo External Facility berthing mechanism, performed Kibo robotic arm grounding tab maintenance, installed spacewalk handrails on Kibo, put in Global Positioning Satellite (GPS) antennae on Kibo, photographed radiators, vapeelectronique (www.vapeelectronique.fr said in a blog post) and photographed trailing umbilical system cables.

Transferred an empty nitrogen tank meeting from ESP3 to the shuttle's cargo bay, transferred a brand new flex hose rotary coupler to ESP3 for vapesystem future use, removed an insulation cover on the Kibo External Facility berthing mechanism, started cleaning and lubrication of the starboard SARJ, and alternative of its 12 trundle bearing assemblies. Applied a thermal cowl on the Alpha Magnetic Spectrometer; lubricating one of the latching ends of the Canadarm2 robotic arm; and vapezigaretten started work to attach energy and data system cables for the longer term installation of docking adapters for venteecigarette future US crew automobiles.

Completed elimination of failed pump module from the S1 truss and began installation preparations on the replacement pump.

Often known as US EVA 21. Inspected and vapeprodukte replaced a Pump Flow Management Subassembly on the station's P6 truss which was leaking ammonia coolant. Put in extra ammonia plumbing between Unity and Tranquility, removed insulation and launch locks from the Cupola, put in further handrails on the exterior of Tranquility and performed get-ahead duties to support the installation of a PDGF on the exterior of Zarya with cable installation on Unity and the S0 truss.

The spacewalk was then cut short after Parmitano reported excess water leaking inside his helmet. Spacewalk suffered a 7-minute delay because of a water leak which formed ice crystals inside the airlock.