Discovery is targeted for a landing at 8:14 a.m. CDT Monday at the Kennedy Space Center in Florida. For that landing, Discovery's engines would be fired at 7:07 a.m. CDT Monday to begin its descent. A second opportunity is available for Discovery to land at Kennedy on Monday, beginning the descent with an engine firing at 8:43 a.m. CDT and leading to a touchdown in Florida at 9:50 a.m. CDT. Flight managers do not plan to consider other shuttle landing sites on Monday.

The weather forecast for landing on Monday calls for a chance of rain in the vicinity of Kennedy's shuttle runway that could be unacceptable for Discovery's landing.

Discovery Commander Steve Lindsey and Pilot Mark Kelly checked the shuttle landing systems and steering jets early today. A test run of one of the three generators that power the shuttle hydraulics found that auxiliary power unit operating normally. A minute leak in that system has remained at expected levels. All three units are planned to be run as normal for landing.

The astronauts spent the rest of their planned final full day in orbit stowing gear and securing the shuttle for the trip home. Key events leading up to Discovery's first landing opportunity on Monday include:

• 4:27 a.m. CDT -- Discovery's payload bay doors are closed
• 6:07 a.m. CDT -- Discovery's astronauts begin to strap in for landing
• 6:48 a.m. CDT -- Mission Control "go" or "no-go" for the deobrit engine firing

The next STS-121 mission status report will be issued after Discovery's landing, or earlier if events warrant.

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