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But NASA does not currently have a viable redesign in hand for the ice frost ramps, shuttle officials said.

"Thermally, they warm up at time in the flight that debris poses a risk to the shuttle," Welzyn said.

"That change constitutes the largest aerodynamic change that we have made to the space shuttle launch system since it first flew," Hale said, adding that analysis of the PAL ramp fix on the entire launch system will likely continue well towards the liftoff date.

While NASA is targeting July 1 to launch Discovery, the STS-121 mission has a flight window that stretches through July 19.

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