Treat critical spares as failure-risk controls
Use FMEA logic to connect spare-parts decisions to failure consequences.
The move: connect every critical spare to a named failure mode. FMEA separates the part from the failure. The spare is only one possible control. If the failure has severe consequences and no fast alternative, stocking may be justified even when usage is rare. If the consequence is minor, the supplier is reliable, or an approved substitute exists, inventory may be the expensive control. Use three questions. What failure mode does this spare address? What is the effect if the part is unavailable at the moment of failure? Which control reduces the risk at the lowest total cost: on-hand stock,…
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