doi:10.1016/j.ress.2017.04.006engBerrade, M. D.Scarf, P. A.Cavalcante, C.A.V.A study of postponed replacement in a delay time modelART-2017-101874We develop a delay time model for a one component system with postponed replacement to analyze situations in which maintenance might not be executed immediately upon discovery of a defect in the system. Reasons for postponement are numerous: to avoid production disruption or unnecessary or ineffective replacement; to prepare for replacement; to extend component life; to wait for an opportunity. This paper explores conditions that make postponement cost-effective. We are interested in modelling the reality in which a maintainer either prioritizes functional continuity or is not confident of the inspection test indicating a defective state. In some cases more frequent inspection and a longer time limit for postponement are recommended to take advantage of maintenance opportunities, characterized by their low cost, arising after a positive inspection. However, when the cost of failure increases, a significant reduction in the time limit of postponement interval is observed. The examples reveal that both the time to defect arrival and delay time have a significant effect upon the cost-effectiveness of maintenance at the limit of postponement. Also, more simply, we find that opportunities must occur frequently enough and inspection should be a high quality procedure to risk postponement.2017http://zaguan.unizar.es/record/6994210.1016/j.ress.2017.04.006http://zaguan.unizar.es/record/69942oai:zaguan.unizar.es:69942info:eu-repo/grantAgreement/ES/MINECO/MTM2015-63978-PRELIABILITY ENGINEERING & SYSTEM SAFETY 168 (2017), 70-79by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess