AI & Digital Manufacturing Analytics worked example

Predictive Maintenance Alert Value with critical spares available for alerts of 120 parts: a worked example

Push critical spares available for alerts up to 120 parts and the picture changes. This example computes every intermediate figure at that operating point. a maintenance manager needs to check whether predicted failures can be covered with available spare parts

The inputs for this scenario

  • Critical spares available for alerts: 120 parts (raised for this scenario; the documented default is 48)
  • Predicted alert-driven daily usage: 6 parts/day (unchanged)
  • Alert uncertainty safety factor: 1.5 x (unchanged)

Working through the calculation

  • Applying the documented formula (Base alert response days = critical spares available รท predicted alert-driven daily usage) to the inputs above produces each figure below.
  • At this operating point the engine returns 13.33 protected days for protected alert response days, the number this scenario is built around.
  • At this operating point the engine returns 20 days for base alert response days.
  • At this operating point the engine returns 120 parts for critical spares available.
  • At this operating point the engine returns 6 parts/day for predicted alert-driven daily usage.

How this compares with the baseline

  • Against the tool's baseline example, where critical spares available for alerts sits at 48 parts and the headline result is 5.33 protected days, this scenario comes in 150% above the baseline at 13.33 protected days.
  • It computes the protected response days your on-hand critical spares provide against predicted usage, discounted by an alert-uncertainty safety factor. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Protected alert response days: 13.33 protected days (headline result)
  • Base alert response days: 20 days
  • Critical spares available: 120 parts
  • Predicted alert-driven daily usage: 6 parts/day

Run it with your numbers

  • Every input above is editable in the live Predictive Maintenance Alert Value calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.