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http://www.space.com/missionlaunches/spirit_steering_041006.html
Heres a statement from NASA:
http://www.jpl.nasa.gov/news/news.cfm?release=2004-249
A steering problem disabled the Mars Rover Spirit Oct. 1, NASA officials said yesterday. The robot has not moved since.
While a fix of some sort is expected, Spirit could proceed with a greater chance of causing other problems.
The robot's right-front and left-rear wheels "did not operate as commanded" on the first day of the month, the space agency said in a statement. Engineers are investigating possible causes and remedies, which might include disabling the brakes on the two wheels so the craft can proceed with its mission in a hampered fashion.
One possible solution is to disable the brakes. But that would put the rover at increased risk.
"If we do not identify other remedies, the brakes could be released by a command to blow the fuse controlling the relay, though that would make those two brakes unavailable for the rest of the mission," said JPL's Jim Erickson, rover project manager.
Without the brakes on two wheels, small bumps or dips might twist the wheel away from the intended drive direction. Such problems might be minimized "by continuing to use the brakes on the left-front and right-rear wheels, by driving in smaller segments, and by adding a software patch to reset the direction periodically during a drive," Erickson said.
Mechanical problems are no great surprise. Spirit and its twin, Opportunity, landed in January and were guaranteed for just 90 days of operation. They completed those respective primary missions in April, then finished up five-month mission extensions in September. The robots began second extensions of their missions on Oct. 1.
Heres a statement from NASA:
http://www.jpl.nasa.gov/news/news.cfm?release=2004-249