Opus Suite by Systecon
18 minutes
Spares Provisioning and Operational Availability
Spares algorithms driven purely by expected demand order fewer spares as MTBF rises, so a design improvement can lengthen downtime when a failure finally happens — Willoughby recorded exactly this, with a tripled-reliability unit whose mean time to repair became thirteen months because no spare transformer had been bought. It is track-specific sustainment material rather than design material, so it hangs off enrichment.