1.   If one system malfunctions, a dealer can simply replace the appropriate box.

2.   One crashed after it rolled to one side because of a hydraulic system malfunction undetected by maintenance workers.

3.   The additional power units are meant to help ensure that telephones linked to the cable network continue to function even if the television part of the system malfunctions.

4.   The postponements were attributed to a series of unrelated problems, including a leaky valve, a faulty computer, a hydraulic system malfunction and Hurricane Opal.

5.   The rudder displacement could have been caused by a systems malfunction, by inadvertent pilot commands or by outside forces.

6.   Investigators believe a pool heating system malfunction was the source of the deadly leak.