David Cobb checks the hydraulic seal he replaced in space shuttle Discovery's right strut.

In bay 3 of the Orbiter Processing Facility, B.F. Goodrich technician David Cobb checks the hydraulic seal he replaced in space shuttle Discovery's right main-gear strut. Engineers determined an observed leak of hydraulic fluid in the main landing gear strut exceeded specification and could not be reduced to an acceptable rate. Thus, the leaky seal and three other seals were replaced. Prior to discovery of the leak, the vehicle had been scheduled to roll over Sept. 19 from the OPF to the Vehicle Assembly Building. A new rollover date will be set for Discovery, which is targeted for launch on Oct. 23. Photo credit: NASA/George Shelton