Flight Engineers Doug Wheelock and Tracy Caldwell Dyson completed the third contingency spacewalk to install a spare ammonia pump module on the S1 Truss at 1:40 p.m. EDT Monday. Flight Engineer Shannon Walker assisted the spacewalkers from inside the International Space Station and operated the Canadarm2.The 780-pound spare pump module was removed from an external stowage platform by Wheelock while working from the Canadarm2. The module was successfully installed on the S1 Truss after Wheelock attached four bolts and Caldwell Dyson mated five electrical connectors.
Ground controllers confirmed the module was in healthy condition when it began receiving power. After a pressure check and more fluid cable connections, the module was filled with ammonia.
Due to time constraints, ground teams and the crew decided not to attach a power cable extension from Quest to a cable on the Unity module.
