Last Time Buy and repair decisions for fast moving parts

S. Behfard*, A. Al Hanbali, M. C. van der Heijden, W. H.M. Zijm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Spare part availability is essential for advanced capital goods with a long service period. Sourcing becomes challenging once the production of spare parts ceases, while the remaining service period is still long. In this paper, we focus on fast moving parts with repair of failed parts as an alternative supply option. We proceed from the methodology of Behfard et al. (2015) for slow movers, which assumes discrete demand distributions and therefore leads to excessive computation times for fast movers. We find that the use of continuous demand distributions requires significant modifications, both for the approximation of the performance indicators and for the optimization of the repair policy. We develop accurate heuristics to find the near-optimal Last Time Buy (LTB) quantity and the repair policy that we apply for two control policies: pull return - push repair, and push return - pull repair. We show that pull return - push repair is better to follow if return lead times are short and return costs are low. For long return lead times, we find that when the return cost exceeds 35%–40% of the part's value, push return - pull repair becomes more cost efficient. We also show that for relatively high demand of spare parts over the planning period (>300 for a 10 years planning period) the continuous model is a good approximation for the discrete model of Behfard et al. (2015). In addition, the computation time of our method is much lower then.

Original languageEnglish
Pages (from-to)158-173
Number of pages16
JournalInternational Journal of Production Economics
StatePublished - 1 Mar 2018
Externally publishedYes

Bibliographical note

Funding Information:
This research is part of the project Proactive Service Logistics for advanced capital goods (ProSeLo) and has been sponsored by the Dutch Institute for Advanced Logistics, DINALOG.

Publisher Copyright:
© 2017 Elsevier B.V.


  • Continuous demand
  • Inventory
  • Last Time Buy
  • Repair
  • Spare parts

ASJC Scopus subject areas

  • Business, Management and Accounting (all)
  • Economics and Econometrics
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering


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