Shuttle a go Go!

I have a 4th of July parade to go to. My daughter's troop will be marching in it. I might just get home in time for the launch. So live blogging won't happen today.

The foam issue has been looked at and was agreed it could go ahead and launch.

Carnegie Mellon University engineering and risk analysis professor Paul Fischbeck, who had been worried earlier in the day by the falling chunk of foam, said NASA's rationale in going ahead made sense and he is slightly more comfortable with a launch try Tuesday.

Fischbeck, who has consulted with NASA on the shuttle's delicate heat protection system, wondered why foam had broken off on the launch pad. "It's something you might want to understand before you launch," he said.

The patch of foam fell off an area that covers an expandable bracket holding a liquid oxygen feed line against the huge external tank. NASA engineers believe ice built up in that area from condensation caused by rain Sunday.

The tank expanded when the super-cold fuel was drained after Sunday's launch was canceled because of the weather. The ice that formed "pinched" some of that foam, causing the quarter-inch-wide crack and the piece of foam to drop off, officials said.

The size of the fallen foam was less than half the size of one that could cause damage, NASA officials said.

NASA managers decided to go ahead with the launch attempt because of three criteria: They are confident enough foam still is on the bracket to prevent a large piece of ice from forming; that the area of foam where the piece dropped was still intact; and they don't believe the area will be exposed to extreme heat during ascent.

Inspectors spotted the crack in the foam insulation during an overnight check of the shuttle. NASA had scrubbed launch plans Saturday and Sunday because of weather problems.

The forecast for a Tuesday liftoff was better than previous days, with just a 40 percent chance that storm clouds would prevent liftoff.

Live Blogging sites:
NASA Shuttle Launch
Flame Trench
***Update****
A backup Circuit Breaker to the controls of primary heaters on the segment joints on both solid rocket boosters is acting up. A crew is going to replace the 100 amp backup breaker. Ice patrols are out inspecting.