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Edition:Final Report
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Abstract:The Texas Department of Transportation operates and maintains a large fleet of automotive equipment. The multi-echelon maintenance system supporting the fleet has, as primary elements, major shop facilities at each Departmental District Office. Because of the large volume of work orders and the sophistication of newer automotive systems, purchase of computerized automotive diagnostic test equipment (CDE) for these shops has been suggested. Data describing the movement of work orders through the District shops were obtained from the EOS Repair-Order-Parts-Issue Data Base. Distributions of work order arrivals, departures, service times, and reason codes were analyzed for Fiscal Years 1988, 1989, and 1990. Of a total volume of approximately 750,000 annual work orders, approximately 5 percent were found to contain reason codes that would be significantly affected by CDE. An economic analysis of the potential benefits and costs of CDE was developed. These calculations indicate that the shops with the highest work order volumes could justify significant CDE investments, while shops with low work order demand could not. Before-After analyses were conducted of ll District shops in which CDE was installed between 1988 and 1990. These analyses indicated reductions in service times and increases in the number of work orders with CDE-susceptible reason codes.
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