| 11. | The power control unit on the Southwest jet failed tests before being reinstalled, he said.
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| 12. | The changing of the power control unit could be the most nerve-racking task during the repair mission.
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| 13. | Later tests revealed that the power control unit in that plane actually functioned backwards in certain circumstances.
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| 14. | "Based on tests we've done, the power control unit did what the control system told it to do,"
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| 15. | _A Southwest 737 was returned to service with a rudder power control unit improperly reassembled in December 1996.
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| 16. | On each spacecraft, the power subsystem consists of a battery and the power control unit ( PCU ).
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| 17. | The power control unit, located in the tail of the airplane, operates similarly to power steering in a car.
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| 18. | The modification will require airlines to remove the airplane's power control unit, replace it with a newly designed model.
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| 19. | They discussed " erratic yaw damper behavior " and " rudder deflections " and " power control units ."
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| 20. | Unlike most major Hubble components, the power control unit was never designed to be worked on by spacewalking astronauts.
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