Compare spare parts, containers or vehicles with failure and downtime records. Include idle time and maintenance cost.
For each failure, record the affected trip, downtime, repair cost and delay caused by an unavailable spare. Add purchase, maintenance, storage and replacement costs for the proposed backup and compare over the same period, separating estimates from measured data.
Calculate backup value from actual failures and downtime records, not an assumed loss on failure day.
For each event, log the part or equipment, downtime start and end, affected trip, repair cost and spare availability.
For the backup option, include purchase, maintenance, storage and pre-use check costs.
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