| 31. | The astronauts removed older equipment, including the last of Hubble's original cameras, a malfunctioning power control unit and its solar arrays.
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| 32. | The power control unit is an electrical device in the tail that converts the pilots'foot-pedal commands into a force moving the rudder.
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| 33. | Specifically, " the proposed power control unit could still be subject to jamming due to particle contamination of the hydraulic fluid ."
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| 34. | Brenner would not estimate, however, how much it would cost to replace the entire power control unit if the tests find problems.
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| 35. | The Federal Aviation Administration said Wednesday it has found all potentially faulty main rudder power control units on the world's fleet of 737s.
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| 36. | The busbars are typically connected to a power control unit that regulates the flow of electricity and thus the temperature of the glass.
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| 37. | NASA said it had little choice but to replace Hubble's original power control unit, a long, narrow box with 36 connectors jammed together.
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| 38. | If the power control unit jammed, the rudder could stop in mid-movement and come back the other way, causing the plane to roll.
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| 39. | She said Boeing has completed and approved the basic redesign of the rudder power control unit and submitted it to the FAA for review.
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| 40. | Their findings could lead NTSB investigators to rule that the Pittsburgh crash was caused by a jam in the 737's rudder power control unit.
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