A swing chair assembly includes a support unit, a seat unit disposed among a pair of upright side frames and a horizontal bar of the support unit, and linking units for connecting the seat unit pivotally and swingably to the horizontal bar. The models are used to calculate past and present deviations from measurements that would result with no faults present, as well as with one or more potential fault modes present. By the arrangement, optically assisted magnetic recording can be performed, small size and light weight are achieved, and higher transfer rate can be implemented. Further, computer instructions create at least one communication connection between two communication devices after viewing call destination attributes. A cyclonic separator at the remote station separates this dust from the air flow and deposits it in a collection tank or drum.