Size the repairable pool
Use Little's Law to connect failure rate, repair turnaround, and repairable-pool size.
Repairable pool Three spare servo drives are not enough because repaired units stay out of the pool too long. The pool problem may be flow time, not only purchase quantity. Flow law Little's Law for repairables Average units tied up in repair equals the repair arrival rate times repair turnaround time. Reflex Buy another spare every time a repairable stockout happens. A pool decision grounded in queue behavior. If repair flow time rises, the same failure rate consumes more of the pool. Failure rate Observe The plant averages two servo-drive failures per month. What is the right first read? Repair…
Sign up free — one personalized lesson every day, matched to your role and goals.
Already have an account? Sign in