On page 4 of https://www.nasa.gov/sites/default/files/atoms/files/nov_2017_nac_iss_status_and_transition_final.pdfis shown that it is planned in January 2018 to moved one MBSU inside the ISS and later again outside.I think that this will be the unserviceable MBSU, which is at the moment installed on ELC-2 FRAM 3.
Three-Day Look Ahead:Thursday, 01/25: ... JOTI/MBSU install
In preparation for the upcoming Main Bus Switching Unit (MBSU) maintenance, today the crew extended the A/L slide table into the JEM pressurized module (JPM), removed the passive capture mechanism, and installed JEM ORU Transfer Interface (JOTI) on the slide table. Next week, robotics ground controllers will remove an MBSU from its location outside the station and place it on the JEM A/L slide table for transfer inside. Once inside, station crew will perform maintenance on the MBSU to recover its functionality and then pass it through the JEM A/L again for reinstallation outside the station.
It seems, that the transfer inside is planned on February,4.http://iss.jaxa.jp/kiboexp/plan/180124.html?utm_source=dlvr.it&utm_medium=twitter
https://blogs.nasa.gov/stationreport/2018/03/QuoteJEM Airlock (JEMAL): Today the crew reconfigured the JEM ORU Transfer Interface (JOTI) in support of upcoming Materials ISS Experiment – Flight Facility (MISSE-FF) payload operations. MISSE-FF will be a permanent external platform on the ISS that is modular and robotically serviceable. Remotely controllable sample carriers will provide sample protection and on-demand picture data previously unavailable on prior experiments. Sample plates containing a variety of surface materials will be exposed to the space environment outside the ISS for varying durations to inform satellite designers on how different materials degrade over time. MISSE-FF is currently manifested on SpaceX-14. QuoteToday’s Planned ActivitiesStructures and Mechanisms JEM ORU Xfer I/F (JOTI) Reconfiguration from MBSU to MTT
JEM Airlock (JEMAL): Today the crew reconfigured the JEM ORU Transfer Interface (JOTI) in support of upcoming Materials ISS Experiment – Flight Facility (MISSE-FF) payload operations. MISSE-FF will be a permanent external platform on the ISS that is modular and robotically serviceable. Remotely controllable sample carriers will provide sample protection and on-demand picture data previously unavailable on prior experiments. Sample plates containing a variety of surface materials will be exposed to the space environment outside the ISS for varying durations to inform satellite designers on how different materials degrade over time. MISSE-FF is currently manifested on SpaceX-14.
Today’s Planned ActivitiesStructures and Mechanisms JEM ORU Xfer I/F (JOTI) Reconfiguration from MBSU to MTT
Bumping for the current MBSU issues. Do we have an update on what came to be with the MBSU that was supposed to be repaired inside the Station?
https://twitter.com/AstroKomrade/status/1123974084033941511
SSRMS Operations in support of upcoming MBSU IFM (In Work)
Main Bus Switching Unit (MBSU) 3 Robotic Operations: Yesterday and last night, the Space Station Remote Manipulator System (SSRMS) used the Special Purpose Dexterous Manipulator (SPDM) to retrieve the failed MBSU 3 from Express Logistics Carrier 2 (ELC2)’s Flight Releasable Attachment Mechanism (FRAM). The FRAM was temporarily stowed on its Enhanced ORU Temporary Platform (EOTP) Side 2, then the empty FRAM was stowed back on ELC2. Today the failed MBSU3 will be placed in the JEMAL for future In-flight Maintenance (IFM).
Robotic Operations Main Bus Switching Unit (MBSU): The Mobile Servicing System (MSS) was powered-up and maneuvered the Space Station Remote Manipulator System (SSRMS) and the Special Purpose Dexterous Manipulator (SPDM) Arm2 in position to install the In Flight Maintenance (IFM) MBSU in the Japanese Experiment Module (JEM) ORU Transfer Interface (JOTI) on the JEM Airlock Slide Table. Next, the MSS was maneuvered into position in preparation for MT translation to Worksite (WS3) for MBSU3 AFRAM transfer.
Main Bus Switching Unit (MBSU) Intermediate (I)-Level Maintenance: Last week the on orbit repairable MBSU was placed on the Japanese Experiment Module Airlock (JEMAL) Slide Table using the Space Station Remote Manipulator System (SSRMS) and the Special Purpose Dexterous Manipulator (SPDM). Today the crew opened the MBSU chassis to access a failed circuit card for replacement. A test was then completed to verify functionality of the unit prior to staging it for egress via the JEMAL. The SPDM will be used again this evening in order to swap the repaired MBSU with a failed MBSU. After the swap is complete, the failed MBSU will be brought inside ISS and prepared for return to the ground via SpaceX-19.
Overnight, Robotics ground controllers powered up the Mobile Servicing System (MSS) and maneuvered the SSRMS with the Special Purpose Dexterous Manipulator (SPDM) to the Japanese Experiment Module (JEM) Airlock. The JEM Airlock slide table was then extended with the repaired Main Bus Switching Unit (MBSU). Once the slide table was extended, the MBSU was removed with SPDM Arm 1. After maneuvering SSRMS and SPDM away from the JEM Airlock, SPDM Arm 2 removed the failed MBSU from the Active Flight Releasable Attachment Mechanism (AFRAM) located on the SPDM Enhanced ORU and Tool Platform (EOTP) side 2. The SPDM Arm 1 was used to install the repaired MBSU on the empty AFRAM. The failed Main Bus Switching Unit (MBSU) was then installed on the JEM Airlock slide table and the slide table was retracted in the JEM Airlock. Finally, the Mobile Transporter (MT) was then translated to Worksite 3.
To finalize this week’s MBSU operations, today the failed MBSU was removed from the Japanese Experiment Module Airlock (JEMAL) slide table and placed in a Cargo Transfer Bag (CTB). The MBSU-3 was declared hard failed on April 29, 2019. The MBSU will return to ground on SpaceX-19.
Completed Task List Activities:Repaired MBSU AFRAM robotically stowed at ESP-2 Site 4