After the successful berthing of the HTV-6 to the Harmony Module (see previous Post), the Robotic Operations between the Station’s Robotic Arm and DEXTRE began.
On Dec 14, 2016, the Robotics Ground Controllers maneuvered the Space Station Remote Manipulator System (SSRMS) to extract the External Platform (EP) from the HTV-6 Unpressurized Logistics Carrier.
The HTV-6 EP was installed on the Payload and ORU Accomodation (POA) of the MBS.
In preparation for the Robotics operation between Dextre and the Station’s Robotic Arm, the MBS was moved towards the starboard truss segment bringing Dextre and the SSRMS closer to the S4 segment.
And here is a closeup view of the MBS-SSSRMS-Dextre complex.
On Dec 31, 2016, the robot arm operators at Johnson Space Center began the complex procedures to replace 12 aging batteries in the ISS solar power system with 6 state of the art lithium-ion power packs, a multi-step process that will require two spacewalks to complete.
The S4 and their batteries were launched in June 2007 on STS-117 Atlantis. It has 2 power electrical channels, 1A (Lower side) and 3A (Upper side).
This is a view of the Starboard side of the truss showing the configuration for the robotics operation. For this demonstration, I have removed the lower solar arrays.
Notice that the radiators are facing forward towards the direction of flight, and the Upper side of S4 is now facing Nadir so Dextre can have access.
Because my S4 IEA art is only a 2D drawing, I will show a simple presentation with charts.
This wraps up the first act of a complex procedure to upgrade the station’s power system and clears the way for the first of 2 spacewalks Friday Jan 6, 2017 in which Expedition 50 Commander Shane Kimbrough and Flight Engineer Peggy Whitson will install 3 Adapter Plates on the IEA to which the old Ni-H2 batteries will be mounted to remain on the ISS but will be inactive.
Next: US EVA-38
Source: Spaceflightnow.com, ISS Status Report, Spaceflight101.com