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Countdown Started For Endeavour Launch

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Aug 6, 2007 8:13 am US/Pacific

Countdown Started For Endeavour Launch

 CBS News Interactive: Shuttle Era

MIAMI (CBS) ― After a successfully replacing a leaky valve, NASA has started the countdown clock to this week's launch of the shutle Endeavour.

"The team is ready. Endeavour is ready," said NASA test director Stephen Payne.

Last week, NASA replaced a leaky valve in Endeavour's cabin with one taken from shuttle Atlantis. Payne said engineers found that air had been escaping from the removed valve because of a small piece of debris on its seal. The valve itself turned out to be fine.

Because of the extra work to replace and test the new valve, NASA delayed the flight by one day, to Wednesday.

Meteorologists are predicting a 70 percent chance of good weather for the early evening launch.

Endeavour's trip to the international space station for construction work features NASA's first educator-astronaut, Barbara Morgan. She was the backup for Christa McAuliffe, who died aboard Challenger in 1986. Morgan will operate a robot arm in space and, if time permits, speak with school children at several locations across the country.

NASA hopes to stretch the mission from 11 days to 14 days, once Endeavour is in orbit, with help from a new system flying aboard the space shuttle. The system will convert and transfer power from the station to the shuttle, allowing the shuttle to remain docked longer than ever before.

(© 2007 CBS Broadcasting Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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