Direct Current To Direct Current (DDCU) LA1A Trip: Last Thursday, DDCU LA1A tripped off due to a ~40 amp overcurrent. Parallel DDCU LA4A was already off for Battery 4A conditioning. A Failure Investigation Team (FIT) recommended the crew perform troubleshooting steps including rotation of the rack and visual inspection of the DDCUs, wire harnesses, and the Secondary Power Distribution Assembly (SPDA). The crew also performed multimeter measurements on both DDCU outputs on the face of the DDCU as well as on the output cable leading to downstream wiring for indications of a fault. Following the troubleshooting, another FIT was held and the recommendation was to R&R DDCU LA1A which the crew completed this morning. Both DDCUs and Pressurized Mating Adapter (PMA)2 shell heaters were powered on and are operating nominally. CEVIS has been reinstalled. Ground teams have recovered most affected loads with a few remaining items to be repowered tonight.
Multi-Omics Operations: The crew supported the Japan Aerospace Exploration Agency (JAXA) Multi-Omics investigation by collecting samples and inserting them in the Minus Eighty-degree Freezer for ISS (MELFI). The investigation evaluates the impacts of space environment and prebiotics on astronauts’ immune function by combining the data obtained from the measurements of changes in the microbiological composition, metabolites profiles, and the immune system.
NeuroMapping Operations: The crew set up the hardware and performed this experiment, including testing in both a “strapped in” and ”free floating” body configuration. The investigation studies whether long-duration spaceflight causes changes to the brain, including brain structure and function, motor control, and multi-tasking abilities. It also measures how long it takes for the brain and body to recover from changes. Previous research and anecdotal evidence from astronauts suggests movement control and cognition can be affected in microgravity. The NeuroMapping investigation performs structural and functional magnetic resonance brain imaging (MRI and fMRI) to assess changes that occur after spending an extended period on the ISS.
Ammonia Measurement Kit Chip Measurement System (CMS) Battery Changeout: The CMS draws a small amount of current even while inactive, therefore the batteries must be changed periodically to ensure the CMS will activate in an emergency. During this procedure the crew verified that the CMS would have activated using the installed batteries near end-of-life, then replaced them.
Treadmill 2 (T2) Monthly Maintenance: The crew completed this regularly scheduled maintenance to inspect the bungee shackle key mount witness marks, Y-Axis isolators, two boot snubbers, and all four snubber arms for signs of free play.
Today’s Planned Activities
All activities were completed unless otherwise noted.
- Morning Inspection, Laptop RS1(2) Reboot Morning Inspection, RSS1,2 Reboot / r/g 1460
- SM ПСС (Caution & Warning Panel) Test
- MRM2 comm config to support the P/L Ops
- KULONOVSKIY KRISTALL. Hardware Setup and Configuration r/g 2578
- JEMAL Depress and Vent
- COSMOCARD. Preparing for and Starting 24-hr ECG Recording / r/g 2579
- Multi Omics (MO) Sample Collection
- RELAKSATSIYA Hardware Setup r/g 2575
- Multi Omics (MO) Sample Insertion into MELFI
- Kulonovskiy Kristall Experiment Run r/g 2578
- Multi Omics (MO) Equipment Stowage
- Multi Omics (MO) Hardware Setup
- RELAKSATSIYA. Parameter Settings Adjustment r/g 2575
- Monthly Inspection of T2 Treadmill System
- MRM2 Comm Reconfig for Nominal Ops
- URAGAN. Observation and photography using Photo Equipment / r/g 2581
- RELAKSATSIYA. Observation r/g 2575
- PHS Evaluation Setup
- RELAKSATSIYA. Closeout Ops and Hardware Removal r/g 2575
- Periodic Health Status (PHS), Subject
- Periodic Health Status (PHS) – CMO
- Periodic Health Status (PHS) Data Entry and Hardware Stowage
- KULONOVSKIY KRISTALL. Copy and Downlink Data / r/g 2578
- DUBRAVA. Observation and photography using VSS / r/g 2580
- JEMAL Verifying depressurization complete
- JEM Airlock Depressurization and Vent Confirmation
- Water Recovery System (WRS): waste tank offload – init
- Filling (separation) of EDV (KOV) for Elektron or EDV-SV r/g 2590
- Progress 432 (Aft) Transfers and IMS Ops / r/g 1812, 1832
- Emergency Operations (EMER) Chip Measurement System (CMS) Battery Changeout
- СОЖ Maintenance
- HMS Defibrillator Inspection
- Water Recovery System (WRS): waste tank offload – term
- WRS – recycle tank fill from EDV
- Progress 431 (DC1) Stowage and IMS Ops / r/g 2435, 2512, 2584
- Dragon Prepack
- NeuroMapping (NMAP) Test Ops
- Countermeasures System (CMS) Sprint Exercise Optional
- Exercise Data Downlink via OCA
- IMS Delta File Prep
- URISYS Hardware Setup r/g 2583
- RELAKSATSIYA. Charging battery for Relaksatstiya experiment (initiate) / r/g 0167
- SPLANH. Diet Restrictions Reminder / r/g 2576
Completed Task List Items
- iPAD cert update [Active]
Ground Activities
All activities were completed unless otherwise noted.
- Nominal ground commanding
Three-Day Look Ahead:
Tuesday, 06/21: OBT 46S emergency drill, EVA EMU swap, JEMAL antivirus scan
Wednesday, 06/22: EMU 3005, 3008 water maintenance/loop scrub
Thursday, 06/23: Habitability, Microchannel Diffusion plate changeout
QUICK ISS Status – Environmental Control Group:
| Component | Status |
| Elektron | On |
| Vozdukh | Manual |
| [СКВ] 1 – SM Air Conditioner System (“SKV1”) | Off |
| [СКВ] 2 – SM Air Conditioner System (“SKV2”) | On |
| Carbon Dioxide Removal Assembly (CDRA) Lab | Standby |
| Carbon Dioxide Removal Assembly (CDRA) Node 3 | Operate |
| Major Constituent Analyzer (MCA) Lab | Idle |
| Major Constituent Analyzer (MCA) Node 3 | Operate |
| Oxygen Generation Assembly (OGA) | Process |
| Urine Processing Assembly (UPA) | Norm |
| Trace Contaminant Control System (TCCS) Lab | Off |
| Trace Contaminant Control System (TCCS) Node 3 | Full Up |