ABSTRACT
This chapter describes methods for modeling and analyzing failures of repairable products that normally exhibit wearout characteristics, particularly nonelectronic equipment. Most repairable products are restored to operable condition through replacement or repair of failed components, rather than replacement or repair of the whole unit. The quality of the restoration is the central issue. If the maintenance action restores the product to as-new condition, then the theory of ordinary renewal processes can be used, and analysis of the failure data is relatively straightforward. However, if the product is not restored to a new condition after maintenance, the analytical procedures and operational decisions related to the analysis become more complex.
