CAPE CANAVERAL - NASA on Thursday delayed the flight of space shuttle Atlantis until late January or, more likely, February to replace a suspect connector in the fuel tank.
The connector is thought to be responsible for back-to-back launch postponements last month.
Deputy shuttle program manager John Shannon said the mission to the International Space Station is off until at least Jan. 24.
"Everything has to go exactly right for us to make the 24th," he said.
Shannon said it's more likely that the launch will move to February. The shuttle almost certainly would have to wait until a Russian cargo ship is launched on Feb. 7 and docks two days later.
Atlantis was poised to lift off in early December with a European space station lab named Columbus, but fuel gauges in the external tank failed late in the countdown.
The problem recurred during a second launch attempt, prompting NASA to conduct a fueling test just before Christmas. That's when the trouble was traced to a connector that feeds wiring through the wall of the tank. The circuitry runs between the fuel gauges in the bottom of the tank and the space shuttle.
The fuel gauges are part of a critical safety system to prevent the shuttle's main engines from running on an empty tank, and have malfunctioned off and on for more than two years. Engineers suspect a design flaw.
NASA removed the external portion of the suspect connector, along with some plugs, over the weekend. It will be another two weeks before the parts are fully analyzed, mimicking the super-cold conditions of fueling, Shannon said.
In the meantime, engineers will replace the external connector and make modifications - essentially soldering pins and changing the material of socket inserts.
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