Dragon Preparation for Return: Weather at the prime Recovery Zone will not support Dragon return tomorrow; release has slipped to the backup date of Saturday, 5 May. With guidance from stowage experts, the crew re-configured already transferred Dragon cargo and all assets, to include cold stowage, are in a good configuration. Tomorrow, the crew will relocate payloads and cold stowage from Dragon to ISS as required. Based on the modified timeline, the crew will resume loading activities, and complete preparations for Dragon for unberth, this Friday. Dragon release is now scheduled at 10:40 AM CDT on Saturday.

Mouse Stress Defense: The crew removed the Mouse Habitat Cage Units from the Cell Biology Experiment Facility (CBEF) and transferred the mice to the Transportation Cage Unit for return on the SpaceX-14 vehicle. Microgravity provokes cellular mechanical stresses and perturbs cellular signaling, leading to reduction of muscle and bone density. To overcome these stresses, one of the promising strategies is to activate Nrf2, a master regulator of antioxidant pathway. Mouse Stress Defense investigates how Nrf2 contributes to effective prevention of space-originated stresses.

Total & Spectral solar Irradiance Sensor (TSIS): On April 16th, the TSIS payload lost power from the 120-volt power feed on the external EXPRESS Logistics Carrier 3 (ELC-3). Yesterday and today the crew performed testing of the 28V and 120V power feeds and switches. No anomalies were detected. TSIS has been returned to nominal operations and no additional issues have been seen with the 120V power feed.

Extravehicular Activity (EVA) Preparations: Today the crew initiated a Metox canister regeneration cycle in preparation for the upcoming US EVA Pump Flow Control System (PFCS) Relocate, currently planned on May 16th. The Metox canister uses a silver oxide-based sorbent to remove practically all CO2 generated during EVAs. After each EVA, the Metox canister are heated and regenerated, releasing the collected CO2 into the ISS cabin atmosphere. The released CO2 is scrubbed from the ISS atmosphere by the Carbon Dioxide Removal Assembly (CDRA). Yesterday’s Metox regeneration initiation was aborted after the Lab CDRA shutdown due to an anomaly.

Advanced Resistance Exercise Device (ARED) Quarterly Maintenance: Today the crew performed routine maintenance on ARED. This task included inspection of the X-rotation dashpots, cycling of the main arm through full range of motion, and application of grease to the Vibration Isolation and Stabilization (VIS) rails and rollers.

Public Affairs Office (PAO) Event: Today, Feustel participated in a live-to-air PAO event with various Public Schools in Laurel, Montana. The students that participated in today’s event are part of the HUNCH (High Schools United with NASA to Create Hardware) program. HUNCH shows high school students the many ways they can put their talents to work for NASA, beyond the role of astronaut. The program provides students a hands-on experience with the space agency — building NASA-designed parts for use by agency personnel.

Today’s Planned Activities

All activities are complete unless otherwise noted.



Fruit Fly Lab-03 Hardware Return

COSMOCARD. Closeout Ops

Mouse Stress Defense Item Gathering

Preventive Maintenance of SM Ventilation Subsystem. Group В2

Installation of additional fans to improve thermal conditions of SM Electric Power Supply 800А storage batteries

XF305 Camcorder Setup

Mouse Stress Defense Post-mission Animal Transfer

Regenerative Environmental Control and Life Support System (ECLSS) Recycle Tank Drain

InvitroBone-2 Transfers from ExPRESS Rack to Dragon capsule

Polar Express Rack Uninstall, Transfer, And Dragon Install with InvitroBone

Polar Express Rack Uninstall, and Transfer, JAXA TCU Handover, and Polar and TCU Dragon Install

Cold Stowage Double Coldbag Pack

Probiotics Fecal Sample Operations

Probiotics Fecal Sample MELFI Insertion

Cargo Transfer to Dragon

СОЖ maintenance

FAZOPEREKHOD. Preparation steps and starting the experiment

Crew to cut ziptie for Cargo 2 power cable and route for access

InvitroBone-1 Transfer from ExPRESS Rack to Dragon capsule

Polar Express Rack Uninstall, Transfer, And Dragon Install with InvitroBone

Video Recording of Greetings

Double Coldbag Transfer to Dragon

Wastewater Storage Tank Assembly (WSTA) Fill

Robotics Work Station (RWS) Display and Control Panel (DCP) Powerup and Checkout

SM, DC1, MRM2, MRM1, FGB, Power Supply Panels ППС-26, ППС-31 Plug-in Audit

Transfer Center Stack to Dragon [Aborted]

FAZOPEREKHOD. Closeout Ops

Advanced Resistive Exercise Device (ARED) Quarterly Maintenance

Public Affairs Office (PAO) High Definition (HD) Config LAB Setup

FAZOPEREKHOD. Preparation steps and starting the experiment

PAO Preparation

Public Affairs Office (PAO) Event in High Definition (HD) – Lab

Dragon Cargo Operations Conference

Dragon Egress in Preparation for Departure [Aborted]

Metal Oxide (METOX) Regeneration Initiation

FAZOPEREKHOD. Closeout Ops

Common Berthing Mechanism (CBM) Controller Panel Assembly (CPA) Rotation, Installation, and Closeout [Aborted]

Completed Task List Activities

None

Ground Activities

All activities are complete unless otherwise noted.



N3 ITCS Dual Mode Transition

Dragon Departure Preparation [Aborted]

LAB MCA Full Calibration

N3 CDRA Activation

Three-Day Look Ahead:

Wednesday, 05/02 : Dragon Cargo Ops, EVA Procedure Review, EVA Airlock Config, ACE T-7 Ops, Veggie PONDS Ops, Lighting Effects, ASIM Checkout Ops, EHS Air and Surface Samples

Thursday, 05/03: JEM ZSR Photo Survey, Mini Exercise Device Ops, Dragon Double Cold Bag Unpack, EMU On-Obit Fit Checks

Friday, 05/04: ETVCG Assembly, Dragon Double Cold Bag Repack, Dragon Center Stack Transfer, Dragon Egress and Closeout

QUICK ISS Status – Environmental Control Group: