| 21. | If so, further tests must be done to see if the whole rudder power control unit must be replaced.
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| 22. | The bellcranks, attached to a hydraulic power control unit, help move the elevators at the rear of the plane.
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| 23. | Boeing is redesigning the airplane's rudder power control unit to prevent possible jamming or reversal of the aircraft's rudder.
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| 24. | At one point a Parker Hannifin executive showed a videotape of a computer simulation of the power control unit's movements.
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| 25. | The company, however, told the NTSB that under certain extreme, hypothetical failure conditions, the rudder power control unit could malfunction.
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| 26. | Astronauts are to replace the power control unit that regulates and distributes power from Hubble's solar panels and storage batteries.
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| 27. | On Tuesday, spacewalkers James Newman and Michael Massimino loosened bolts on the doors leading to the power control unit and batteries.
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| 28. | He also performed three space walks totaling 21 hours and 9 minutes, including the installation of the new Power Control Unit.
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| 29. | I think the part about the rudder and the power control unit should have been explored a little more in depth.
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| 30. | The FAA directive calls for regular testing and inspection of the actuator, or power control unit, and replacement within three years.
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