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"Impact of Maintenance Staffing on Availability of the U.S. Air Traffic Control
System", 1998 IEEE Reliability and Maintainability Symposium Proceedings, Anaheim,
CA, January, 1998
This paper describes a model for assessing the impact of staffing on outage times
and availability in the national network of air traffic control equipment using
a finite queuing model. Because of the wide geographic distribution of FAA facilities
and equipment, maintenance is provided out of a national network of cost centers.
Each such center has a limited number of technicians (“servers”) who are
responsible for providing scheduled maintenance and repair for the equipment assigned
to that center. When an equipment requires service and a qualified technician is
available, then the outage time is simply the repair time. However, if there are
equipment failures when technicians are busy making other repairs, then there is
an additional waiting time until a qualified technician is free. The model determines
average outage times as a function of the number of technicians assigned to a cost
center, equipment failure rates, and the number of equipment which technicians must
support.
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