ISS Daily Summary Report – 2/24/2021


CIR (Combustion Integrated Rack) Fluids and Combustion Facility: The crew replaced the CIR FOMA Cal Unit. The CIR includes an optics bench, combustion chamber, fuel and oxidizer control, and five different cameras for performing combustion investigations in microgravity.

Micro-16: The crew printed an on-board copy of the checklist for the Syringe Pump Sequence and Valve Position. Loss of muscle mass and strength present a major challenge for astronauts on future long space voyages. Determining Muscle Strength in Space-flown Caenorhabditis elegans (Micro-16) uses this tiny worm to test whether decreased expression of muscle proteins is associated with decreased strength. The research team developed a new device to measure muscle strength in multiple generations of space-reared C. elegans worms and compare that strength to postflight muscle gene expression analyses.

HRF-1 (Human Resources Facility-1): The crew removed the Payload Ethernet Hub Bridge (PEHB) from the HRF-1 Rack and partially replaced it with an improved Payload Ethernet Hub Gateway (PEHG). There were some issues with the cable installations and ground teams are evaluating a troubleshooting plan to complete the rest of the installation. The rack was placed in a safe configuration. HRF-1 provides an on-orbit laboratory that enables scientists conducting human life science research to evaluate the physiological, behavioral, and chemical changes induced by space flight. Research performed using HRF-1 provides data to help scientists understand how the human body adapts to long-duration spaceflight.


Extravehicular Mobility Unit (EMU) On-orbit Fitcheck Verification (OFV): The crew performed a fitcheck of EMUs 3009 and 3015 in order to verify correct EMU sizing prior to the ISS Roll Out Solar Array (IROSA) Prep Extravehicular Activity (EVA). During the OFV, EMU 3015 failed an automated leak check. Initial troubleshooting of the EMU was unsuccessful. Eventually, the crew as able to isolate the Lower Torso Assembly (LTA) as the suspect component and swapped the component with another LTA from EMU 3006. EMU 3015 successfully passed the leak check and the OFV was completed for both EMU 3009 and 3015 and suits are in a nominal configuration.

EVA Preparations: The crew completed several activities in preparation for the IROSA Prep EVA. The crew reviewed a detailed timeline, the tool configuration summary, the sharp edge briefing, notes, cautions and warnings, and Dynamic Onboard Ubiquitous Graphic (DOUG) animations. The crew also performed a Rechargeable EVA Battery Assembly (REBA) powered hardware checkout for glove heaters and EMU TV on EMU 3009.

Completed Task List Activities:

  • None

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

  • X2R19 Software Transition Commanding (Day 2 of 4)
  • EMU OFV Support Commanding
  • Crew-1 Dragon Checkout

Look Ahead Plan

Thursday, February 25 (GMT 056)

  • PBRE Water inspect (NASA)
  • Food Acceptability (NASA)
  • Food Physiology Brief (NASA)
  • Industrial Crystallization Facility (ICF) install (NASA)
  • CIR FOMA Calibration prep part 1(NASA)
  • Micro-16 Microscopy, Experiment setup and init. Ops (NASA)
  • ELF Fastener R&R, Cartridge Install (JAXA)
  • TOHOKU2021 Ops (JAXA)
  • CBEF Ethernet cable reconnect (JAXA)


  • EVA Procedure Conference
  • EVA DOUG Review
  • EVA Tool Config
  • IFM Hatch Seal Inspection

Friday, February 26 (GMT 057)

  • PBRE Water inspect (NASA)
  • ICF SCGC Module install (NASA)
  • CIR FOMA Calibration prep part 2 (NASA)
  • Micro-16 Experiment setup and load (NASA)
  • Food Acceptability (NASA)
  • Asian Herb Watering (JAXA)
  • JAXA video Take 5 (JAXA)
  • FLARE (SCEM) Power cable connect (JAXA)


  • EVA Tool Config
  • EVA A/L Fitcheck
  • EVA Cuff C/L Print
  • RGN Tank Manual Fill
  • Cygnus Cargo Ops

Saturday, February 27 (GMT 058)

  • PBRE Water inspect (NASA)
  • M16 USB drive removal (NASA)
  • CIR vlv Timer set (NASA)
  • ISS HAM powerdowns (NASA)


  • Cygnus Cargo Ops
  • EVA Procedure Review
  • EVA Isle Prep
  • EVA Tool Audit
  • EVA Equipment Lock Prep

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

  • REBA Powered Hardware Checkout
  • Equipment Lock Prep Part 1
  • EMU On-orbit Fitcheck Verifications
  • EVA Procedure Reviews
  • EVA EHIP Check
  • AULD Battery Charging
  • БМП Ф1 Absorption Cartridge Regeneration
  • Replacement of Condensate Pumping Unit (БПК) and БПК Control Panel
  • Replacement of [АСУ] urine receptacle (МП) and filter-insert (Ф-В). [АСУ] toilet activation after replacement
  • Changeout of Dust Filter ПФ1-4 Cartridges in SM
  • Charging Scalar DG-3X Battery
  • Acoustic Monitor Data Transfer and Stow
  • Public Affairs Office (PAO) Event in High Definition (HD) – JEM
  • Antimicrobial Coatings Touch
  • Micro-16 Checklist Print
  • Astrobee OBT Review
  • PBRE/MSG Water Release Inspection/Cleanup
  • Combustion Integrated Rack FOMA Cal Unit Replacement
  • ASEPTIC. Retrieval of Poverkhnost No.17.1 and Vozdukh 17.1 devices from thermostat. External inspection of culture media in devices