RELIABILITY AND AGING OF REPAIRABLE SYSTEMS

This paper discusses some of the complexities of ageing repairable sys tems, especially those relating to computation of their reliability. I n order to cope with them in a realistic manner, a discrete event simu lation model using the time between successive failures of the subsyst ems has been proposed. The model has been used for the evaluation of i mprovement or deterioration of system reliability with increasing age. The effects of the design modification of one or more subsystems on t he system reliability are studied by conducting simulation experiments . Live data from the operation of a fleet of trainer aircraft is used for illustration purposes; the results are presented and discussed.