Video highlights from the fourth spacewalk of shuttle Endeavour's STS-123 mission are packaged into this Flight Day 11 movie. The astronauts conducted a heat shield repair demonstration to test the Tile Repair Ablator Dispenser (T-RAD) materials and techniques developed to fix a damaged shuttle in space.
Source: NASA TV (22 min 31 sec MPEG-4 (H.264) file)
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