For many spares, demand is scheduled, not forecast. A rebuild every 18 months that uses four bearings is a plan, not a statistical pattern.
Planned demand
Demand is derived from maintenance plans, and changes to a plan cascade to the components it uses. Time-phased material requirements show when each part is needed.
Failure demand
For unplanned failures, installed base, equipment population and failure behaviour say more than consumption history alone.
The maintenance-to-material chain
Equipment
BOM
Maintenance plan
Planned work
Material demand
Policy
Recommendation
See StoXeo on your own data
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