|Total EVA time:||6h 35m|
|No.||Date||Together with||Time||Main tasks and notes|
|1||01.09.2009||D. Olivas||6h 35m||
Preparing for the replacement of an empty ammonia tank on the station's port truss, or backbone, by releasing its bolts. They also retrieved a materials processing experiment and a European science experiment mounted outside the Columbus laboratory and stowed them in Discovery's cargo bay for their return to Earth.