Mission

Test for a tile repair technique/procedure using the Tile Repair Ablator Dispenser (T-RAD) and a sample tile plate（Image credit: NASA）

The mission's fourth extravehicular activity (EVA#4) was carried out today by STS-123 mission specialists Robert Behnken and Mike Foreman. During the EVA#4, they replaced a circuit breaker called as Remote Power Controller Module (RPCM), which is located on the station's truss.

Reconfiguration of the power cables was scheduled thereafter to restore redundant power to the station's Control Moment Gyroscope 2 (CMG2), but it was not carried out due to some difficulties in the connector removal. Then, they tested a tile repair technique/procedure using the Tile Repair Ablator Dispenser (T-RAD) and a sample tile plate.Two spacewalkers managed to undertake a get-ahead task before going back inside the station.

There was no robotic operation during the EVA#4. The crew inside the station took video of the EVA activities to support the spacewalkers.

Astronaut Doi's on orbit activity

With all the required tasks inside the Japanese Experiment Logistics Module-Pressurized Section (ELM-PS) completed, astronaut Doi concentrated on the transfer operations today. He is the STS-123 Mission's load master and thus responsible for the process and progress of the transfer operations between the station and the space shuttle. Astronaut Doi keeps in contact with the ground team to confirm the items to be transferred during the day, or to report the status and progress of the transfer operations.

Astronaut Doi re-performed the JAXA Education Payload Operations (EPO) that he has already conducted on FD 9. Astronaut Doi was requested to repeat the operations in order to obtain some more photos.

For further information, please refer to the NASA STS-123 Mission Status Report

*All times are Japan Standard Time (JST)