![]() They radio Mission Control about the problem, and Mission Control says that Hal is in error predicting the fault. But when he brings it back and runs it through diagnostics, they can find no problem with the AE-35. David Bowman goes out and retrieves the unit. He suggests that they go EVA and replace the faulty unit with a new one. About three weeks into the flight, HAL identifies a fault in the AE-35 unit, the system responsible for keeping the communications antenna aligned with the Earth, and states that it will go one-hundred percent failure within 72 hours. HAL also has several "eyes" placed periodically around the spacecraft. HAL is built into the Discovery One spacecraft, and is in charge of maintaining all mechanical and life support systems on board.
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