“Intrinsic
availability” is the percentage of time that a machine would operate
based on downtime attributed to relevant interrupts and active repair or
recovery only.
IA = Productive time / (Productive time + Repair time) *100%
Field studies
indicate that Intrinsic Availability typically ranges from 95% to 99%. A
95% Intrinsic Availability means that 95% of the time the machine runs
without requiring operator intervention, beyond normal tasks such as
loading components. Five percent of the time requires operator
attention. 95% Intrinsic Availability translates into 24 minutes of
unexpected down time during an 8-hour full production shift. “Full
production” excludes scheduled maintenance, operators breaks, set-ups.
Intrinsic Availability does not affect board quality, but it does impact
throughput and utilization.
