ISS Daily Summary Report – 5/04/2021


AC Touch: Per standard procedure, the crew touched both the coated and uncoated coupons for this long-term investigation. Boeing Environment Responding Antimicrobial Coatings tests is an antimicrobial coating on several different materials that represent high-touch surfaces. Some microbes change characteristics in microgravity, which could create new risks to crew health and spacecraft systems, as well as create the possibility of contaminating other planetary bodies. The samples will remain in space for approximately six months and then will return to Earth for analysis.

Celestial Immunity: The crew performed activities related to the inoculation, treatment injection, and sample collection for the Celestial Immunity cultures.  This starts the 3 weeks of activities related to the experiment.  This project seeks to gain a broad understanding of how gravity affects overall human immune function and potentially uncover novel pathways of immune function that can be exploited to develop better vaccines and immunobiologics for human use. The project will build on earlier studies that evaluated lymphocyte (a type of white blood cell) function in microgravity. The project will also evaluate whether gravity-regulated immune pathways are affected by age by examining cells from young adult and elderly donors in parallel.

Myotones: The crew reviewed the big-picture words, set up the appropriate hardware, and performed a Myotones measurement session with the Myotones device.  The Muscle Tone in Space (Myotones) investigation observes the biochemical properties of muscles (e.g. muscle tone, stiffness, elasticity) during long-term exposure spaceflight environment. Results from this investigation can provide a better understanding of the principles of human resting muscle tone. This could lead to the development of new strategies for alternative treatments for rehabilitation on Earth, as well as for future space missions.

SUBSA prep: The crew gathered the appropriate hardware and reviewed the procedures for the later installation of the SUBSA hardware in the Microgravity Science Glovebox (MSG).  The first SUBSA investigation to be performed will be the BRAINS investigation. BRazing of Aluminum alloys IN Space (SUBSA-BRAINS) examines differences in capillary flow, interface reactions, and bubble formation during solidification of brazing alloys in microgravity. Brazing technology bonds similar materials (such as an aluminum alloy to aluminum) or dissimilar ones (such as aluminum alloy to ceramics) at temperatures above 450°C. It is a potential tool for construction of human space habitats and manufactured systems as well as repair tool for damage from micrometeoroids or space debris.


Commercial Off The Shelf (COTS) Ultra High Frequency (UHF) Communications Unit (CUCU) Removal – The CUCU system was retired in place post SpaceX-20, with the hardware remaining installed in Expedite the Processing of Experiments to the Space Station (ExPRESS) Rack 6 Locker 7.  In order to prepare for an upcoming payload that will be installed in the Locker 7 location, the CUCU was disconnected and removed from the rack today. The connection made today also applies to the external UHF antennas which will be tested via ground pass tests scheduled tomorrow and Thursday with Armstrong Flight Research Center.  The ground pass tests will evaluate the SSSR/UHF signal strength and full end to end path as a final confirmation that the system is operating nominally.

Extravehicular Mobility Unit (EMU) Secondary Oxygen Pack (SOP) Swap – Crew completed an activity to swap SOPs between EMU 3006 and EMU 3004.  The SOP (S/N 1013) originally installed on EMU 3004 has a leak rate within spec that is approaching the minimum Go/No-Go pressure.  Swapping the SOPs between suits will install SOP S/N 1013 on EMU 3006, which is closer to the end of its certified life and is planned to return on SpaceX-24.

Crew Alternate Sleep Accommodation (CASA) Bumpout Configuration – Ground teams reviewed photos of CASA with the bumpout collapsed as part of the final approval for internal stowage and identified that the front panel is not installed onto the side panels as expected.  Teams are working a forward plan to resolve the configuration.

Robotic Operations – Yesterday the Mobile Transporter (MT) was translated from Worksite 7 to Worksite 2, and the Space Station Remote Manipulator System (SSRMS) was maneuvered to a park position.  Today the SSRMS was maneuvered to External Stowage Platform 3 (ESP-3) and Special Purpose Dexterous Manipulator (SPDM) successfully grasped and extracted the NiH2 Battery Flight Releasable Attachment Mechanism (FRAM) from Site 6.  Robotic operators are preparing to translate the MT to Worksite 3 and install the NiH2 battery and FRAM on Cygnus Site 1 for disposal.

Completed Task List Activities:

  • None

Today’s Ground Activities:
All activities are complete unless otherwise noted.

  • Special Purpose Dexterous Manipulator (SPDM) Flight Releasable Attachment Mechanism (FRAM) Stow
  • HRF Rack 1 Rack Power Up Commanding
  • Atmosphere Revitalization System (ARS) Lab Major Constituent Analyzer (MCA) Zero Calibration

Look Ahead Plan

Wednesday, May 5 (GMT 125)

  • AC Touch
  • Astrobee off
  • Celestial Immunity
  • ManD canister swap
  • Standard Measures/Repository
  • SUBSA hardware setup


  • Transfer Cygnus Cargo Operations
  • Crew Dragon Tablet Sync
  • Node 3 Endcone Stowage Cleanout

Thursday, May 6 (GMT 126)

  • Astrobee on
  • Celestial Immunity
  • CIR bottle gather
  • Food Acceptability
  • Standard Measures/Repository


  • Regenerative Environmental Control and Life Support System (ECLSS) Oxygen Generation System (OGS) Hydrogen Sensor ORU Purge Adapter (HOPA) Operations
  • OGS R&R
  • Adlink Mini PC Restow 

Friday, May 7 (GMT 127)

  • AC Touch
  • Astrobee off
  • Celestial Immunity
  • CIR manifold bottle replace
  • ELF sample holder change
  • ESA EPO AstroPi config
  • Food Acceptability
  • Food Physiology
  • JAXA video take 1
  • HRF2 troubleshooting deconfiguration
  • Nanoracks Platform 2 module remove
  • Standard Measures/Repository


  • Crew Provisions Consolidation
  • Environmental Health System (EHS) – Compound Specific Analyzer-Combustion Products (CSA-CP) Extended Maintenance
  • In-Flight Maintenance Starboard Stall Mounting Bracket Remove & Replace

Today’s Planned Activities:
All activities are complete unless otherwise noted.

  • Resupply Air Tank Setup and Initiation
  • Antimicrobial Coatings Touch
  • Celestial Immunity Thaw and Centrifuge
  • Celestial Immunity LSG Staging
  • Celestial Immunity MELFI Sample Insertion
  • Celestial Immunity MELFI Sample Retrieve
  • Celestial Immunity Treatment and Sample
  • Countermeasures System (CMS) Advanced Resistive Exercise Device (ARED) Cylinder Flywheel Evacuation
  • Columbus cleanup for Myotones
  • Columbus cabin restore after Myotones experiment
  • iWatch Charge for SpX CREW DRAGON
  • Remove SpX-CREW DRAGON iWatch from charger
  • Acoustic Monitor Battery Swap
  • Acoustic Monitor Setup for Crew Worn Measurements
  • Environmental Health System (EHS) – Formaldehyde Monitoring Kit (FMK) Deployment Operations
  • Environmental Health System (EHS) Grab Sample Container (GSC) Sampling Operations
  • Environmental Health System (EHS) Total Organic Carbon Analyzer (TOCA) Water Recovery System (WRS) Sample Analysis
  • Environmental Health System (EHS) Total Organic Carbon Analyzer (TOCA) Sample Data Record
  • ETHOS CTB Reorganization
  • Extravehicular Mobility Unit (EMU) Installation In EMU Don-Doff Assembly (EDDA) Upside Down
  • Extravehicular Mobility Unit (EMU) Secondary Oxygen Pack (SOP) Swap
  • Health Maintenance System (HMS) – ESA Nutritional Assessment
  • Health Maintenance System (HMS) Profile of Mood States (POMS) Questionnaire
  • HRF Generic Frozen Blood Collection Hardware Setup First Time Performance
  • HRF Generic MELFI Sample Insertion Operations
  • HRF Generic MELFI Sample Retrieval And Insertion Operations
  • HRF Generic Saliva Collection 10 Minutes
  • HRF Generic Urine Collection Male
  • COTS UHF Comm Unit (CUCU) Removal with RF Coupler Demate
  • In Flight Maintenance (IFM) Internal Thermal Control System (ITCS) Quick Disconnect (QD) Locate
  • In-Flight Maintenance Port Stall Mounting Bracket Remove & Replace
  • IMS delta file prep
  • ISS Crew Orientation
  • LSG Primary Crew Restraint Initial Fold
  • LSG Crew Restraint Installation Initial (Primary)
  • Discharge Makita drill tool batteries (4 count: No.2, No.3, No.4, No.5). Charging Makita Drill Tool Battery No.2. Tagup with specialists as necessary
  • Myotones Device Data Transfer
  • Myotones Big Picture Words reading
  • Myotones Kit Gathering for Session 1
  • Myotones Device Setup with EPM Laptop – Session 1
  • Myotones Measurements
  • Photo T/V (P/TV) Advanced Resistive Exercise Device (ARED) Exercise Video Stow
  • Photo/TV Camcorder Setup Verification
  • Public Affairs Office (PAO) Event in High Definition (HD) – JEM
  • Public Affairs Office (PAO) High Definition (HD) Config JEM Setup
  • Station Support Computer (SSC) Ethernet Swap
  • Story Time 8 Thermal Balance Black Light On
  • Story Time 8 Thermal Balance Black Sphere Setup
  • Story Time 8 Thermal Balance Hardware Stow
  • Story Time 8 Thermal Balance White Light Off
  • Solidification Using Baffles in Sealed Ampoules Hardware Gather
  • REAL. Solidification Using Baffles in Sealed Ampoules (SUBSA) OBT
  • Solidification Using Baffles in Sealed Ampoules OBT
  • Emergency RS ISS VHF-1 Comm Checkout from USOS