Return minus 15 (R-15) Human Research Program (HRP) Collections: The 48S returning crewmember performed a fasting blood draw followed by urine collections. Both blood and urine samples were stowed in Minus Eighty Degree Celsius Laboratory Freezer for ISS (MELFI) for freezing and storage for return and analysis. The Biochemical Profile experiment tests blood and urine samples obtained from astronauts before, during, and after spaceflight. Specific proteins and chemicals in the samples are used as biomarkers, or indicators of health. Post-flight analysis yields a database of samples and test results which scientists can use to study the effects of spaceflight on the body. The repository is a storage bank used to maintain biological specimens over extended periods of time and under well-controlled conditions. This repository supports scientific discovery that contributes to our fundamental knowledge in the area of human physiological changes and adaptation to a microgravity environment and provides unique opportunities to study longitudinal changes in human physiology spanning many missions.

Habitability: The crew completed two Habitability activities, both the fifth in the series. The first activity was a walk-through video of areas used for recreation activities, explaining what activities are performed and where, and focusing on considerations for designers of future vehicles. The second activity was a Narrated Task Video of the Node 3 ventilation cleaning, capturing details such as volume needed to perform task, vehicle planning considerations, and systems interface issues, as well as any other human factors concerns. The Habitability investigation collects observations about the relationship between crewmembers and their environment on the ISS. Observations can help spacecraft designers understand how much habitable volume is required, and whether a mission’s duration impacts how much space crew members need.

Lighting Effects Meter Reading: The crew set up and configured the Light Meter hardware and took readings in the Node 3 and US Lab. Both modules still use the legacy General Luminaire Assembly (GLA), while the lights in Node 1 have been upgraded to the Solid State Lighting Assemblies (SSLAs). The Lighting Effects experiment hopes to better quantify and qualify how lighting can effect habitability of spacecraft. The light bulbs on the ISS are being replaced with a new system designed for improved crew health and wellness. The Lighting Effects investigation studies the impact of the change from fluorescent light bulbs to solid-state light-emitting diodes (LEDs) with adjustable intensity and color and aims to determine if the new lights can improve crew circadian rhythms, sleep, and cognitive performance. Results from this investigation also have major implications for people on Earth who use electric lights.

Node 2 HMU 220 Power Cable Re-route: Today the crew completed re-routing an existing power cable (HMU 220) from Node 2 to a previously routed wire harness. HMU 220 previously provided power to the Node 2 Zenith berthing port through the HTV Node 2 Jumper. The power cable was routed from the Node 2 Forward Endcone toward the Node 2 Deck Crew Quarter Standoff and mated to wire harness W8553 to support a redundant power feed for the previously installed Node 1 Galley Rack. During the HMU 220 task, Shell Heater temperature sensor 1B in Pressurized Mating Adapter (PMA) 2 failed high. Wire harness HMU 671, adjacent to HMU 220, provides data routing for the failed sensor. The crew was directed to inspect the harness for damage but none was reported. There is sufficient redundancy on shell heater 1A. Grounds teams are reviewing telemetry.

On Board Training (OBT) Soyuz Descent Drill: In preparation for departure from the ISS scheduled for next Monday, April 10th, the 48S Crew completed this nominally planned descent drill.

N3 Deck Starboard Intermodule Ventilation (IMV) Fan Inlet Cleaning: The crew cleaned this location to remove Foreign Object Debris (FOD) from IMV fan inlets and silencers.

Today’s Planned Activities

All activities were completed unless otherwise noted.

Soyuz 732 Stowage Ops

Preparation of Reports for Roscosmos Web Site and Social Media

URAGAN. Observation and photography

EKON-M. Observations and photography

Lighting Effects Sleep Log Entry

Acoustic Dosimeter Reminder

ARED Photo/TV Reminder

Reminder HRF Generic Frozen Blood Collection

HRF Generic Urine Collection

HRF Generic Frozen Blood Collection

VHF-2 Emergency Communication Check Out from 49S over US Ground Sites

SPHERES Battery Swap

EHS Total Organic Carbon Analyzer (TOCA) Water Recovery System (WRS) Sample Analysis

Acoustic Dosimeter Setup Day 1

HRF Generic Refrigerated Centrifuge Spin

HRF Generic Sample MELFI Insertion

Habitability Walk-through Video

ISS Crew departure preparation

Soyuz 732 Descent OBT

Photography of Glass on SM Windows No.1,12 and ВЛ2 in in DC1

Node 2 Power Cable (HMU 220) Reroute

SPHERES Battery Swap

Vascular Echo Flashdrive Install

Closing Shutters on windows 6, 8, 9, 12, 13, 14.Note 6

Lighting Effects Light Meter Readings Alternate 1

Maintenance activation of Atmosphere Purification System Emergency Vacuum Valves [АВК СОА] from the Spares Kit (СМ1РО_3_321_1, bag II-1/256-1, cover for [АВК] (007223R)))

USOS Window Shutter Close

DAN. Experiment Ops

HRF Generic Urine Collection

In Flight Maintenance (IFM) Node 3 Deck Starboard Intermodule Ventilation (IMV) Cleaning

Brine transfer to Progress 435 Rodnik H2O Tank 1, flushing connector B1

Habitability Narrated Task Video Setup

Node 2 Power Cable (HMU 220) Rerouting

Soyuz 732 СУД Test prior to undocking

Soyuz 732 [АСУ] Activation

Habitability Narrated Task Video End – Subject

External Wireless Instrumentation System (EWIS) Network Control Unit (NCU) Power On

KORREKTSIYA. NEUROIMMUNITET. Experiment

Rodent Research 4 Clean up 1

Vascular Echo Software Transfer

EHS Total Organic Carbon Analyzer (TOCA) Sample Data Record

External Wireless Instrumentation System (EWIS) Network Control Unit (NCU) Power Off

Dose Tracker Data Entry Subject

NEUROIMMUNITET

Completed Task List Items

Manufacturing Device Print Removal, Clean and Stow

Remove Lamp Housing Assembly NOD3FO2 and Replace with Light

Ground Activities

All activities were completed unless otherwise noted.

Node 2 (N2) Power Cable re-routing support

Three-Day Look Ahead:

Wednesday, 04/05: Galley PWD install, EMU loop scrub, Crew Quarters cleaning, crew departure prep

Thursday, 04/06: Rodent Research inventory, Google Street View image acquisition, 48S prepack, VEG03 install

Friday, 04/07: Crew off duty

QUICK ISS Status – Environmental Control Group: