31.   Later tests revealed that the power control unit in that plane actually functioned backwards in certain circumstances.

32.   Mechanics later removed and replaced the main rudder power control unit on the jet.

33.   Most brake systems use some form of power assist unit.

34.   Most power backup units for desktops are about the size of a shoebox.

35.   Place the power unit on the stepladder so that it is level with the header bracket.

36.   Parker is the manufacturer of the rudder power control unit.

37.   Position the control switch on a nearby wall and connect a wire from it to the power unit.

38.   Quieter and more environmentally friendly than the power units, these mowers usually require less preseason cleaning.

39.   Replacing the power unit, which was not designed to be replaced, is considered the toughest and riskiest job.

40.   Project plans call for Whittaker and his colleagues to go to Antarctica in November to test sensors, power units, communication systems and other components.