NASA also moved the target planning window from September 2004 to March 2005. The date change may be a bit disappointing to space enthusiasts. But as NASA officials pointed out, the extension is crucial to ensuring the safety of the crew and orbiter.

Moving the target date gives the agency the time it needs to prepare for new launch constraints. For example, a new rule states that for at least the next few flights, Shuttles should only launch during daylight hours to allow the best photography of the Shuttle assembly for post-launch review. Another challenge will be having a second Shuttle on standby, ready to launch a rescue mission if necessary.

"We're going through the process of further defining exactly what that rescue capability will be and defining the mission products that are required to be on the shelf, ready to execute," Readdy said.

The extension also allows NASA to work out some technical challenges.

During Discovery's overhaul period, technicians analyzed the actuators that drive the rudder speed brake, which helps control and slow the orbiter during entry and landing.

Because the inspection revealed minor corrosion, wear and installation problems, further work is required to inspect and repair the actuators on all three orbiters. Discovery was the first orbiter to receive this attention, so it was selected as the Return to Flight vehicle.

NASA also needs more time to design and build the boom that will allow the astronauts to inspect the orbiter for damage while in space. Designing the camera/laser sensor package for the end of the boom has proven challenging, but Readdy is confident that a solution is close.

Finally, further research, analysis and testing are necessary before the Shuttle's massive orange external tank can be deemed safe for flight. NASA is paying special attention to the way debris that comes off the tank reaches the orbiter during launch, and how the tank's foam insulation is applied.

"We've said for months that we'd be driven by milestones, not a calendar," said Readdy. "When we successfully reach those milestones, that's when the Space Shuttle will return to safe flight."

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