LOS ANGELES (AP) - A spacecraft hurtling toward Mars for a Dec. 3 landing is not afflicted by the same metric conversion problem that caused a sibling probe to vanish as it arrived at the Red Planet last month, mission controllers say. Reviews of the Mars Polar Lander's position also indicate it is on course for its 90-day mission to search for evidence of water, Richard Cook, the spacecraft's operations manager at NASA's Jet Propulsion Laboratory, said Thursday. The Mars Climate Orbiter was lost Sept. 23 just as it was starting to circle the planet. It likely burned up or broke apart in the Martian atmosphere that it was supposed to study, controllers said.