The Service Structure begins rolling back to free Space Shuttle Discovery for launch of mission STS-92 at 8:05 p.m.

In the early morning hours, the Rotating Service Structure (left) begins rolling back to free Space Shuttle Discovery for launch of mission STS-92 at 8:05 p.m. Oct. 9. Above the external tank can be seen the Gaseous Oxygen Vent Arm with its vent hood, commonly referred to as the “beanie cap.” The system is designed to vent gaseous oxygen vapors away from the Shuttle after cryogenic loading. The scheduled launch is the second attempt after an earlier scrub. STS-92 is making the fifth flight for construction of the International Space Station. The mission is also the 100th in the history of the Shuttle program