Engineers detected voltage irregularities in the back up controller on Main Engine No. 3. Each of the shuttle's three liquid-fueled main engines have primary and back-up controllers that effectively are the electronic brains of the engines.
Engineers will brief managers today while launch preparations continue here at Kennedy Space Center. That meeting was originally scheduled for 3 p.m., but has now been pushed back to 5 p.m.
As it stands, liftoff remains scheduled for 3:52 p.m. Wednesday.
The same back-up controller exhibited some circuitry trouble during routine prelaunch checkouts earlier in the countdown, but switch throws in the shuttle's cockpit cycled power on and off, clearing the problem. NASA Test Conductor Steve Payne said that problem was considered to be resolved.
very at its Kennedy Space Center launch pad as countdown clocks tick toward the planned launch of the orbiter's 39th and final flight.
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