Aftermarket, Field Service & Service Parts worked example

Spare Parts Obsolescence Exposure at 81% still-salable stock share: a worked example

This scenario runs the spare parts obsolescence exposure calculation on the strong side: 81% still-salable stock share, with every other input held at its documented default. a parts inventory analyst needs to estimate how many spare parts may become obsolete or need disposition

The inputs for this scenario

  • Parts at obsolescence risk per review: 85 parts/review (unchanged)
  • Inventory review cycles: 6 reviews (unchanged)
  • Still-salable stock share: 81 % (raised for this scenario; the documented default is 70)
  • Recoverable disposition yield: 55 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross obsolescence risk = parts at risk per review × inventory review cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 227 recoverable parts for recoverable obsolescence exposure, the number this scenario is built around.
  • At this operating point the engine returns 510 recoverable parts for gross parts at obsolescence risk.
  • At this operating point the engine returns 96.9 recoverable parts for stock no longer salable.
  • At this operating point the engine returns 186 recoverable parts for disposition yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where still-salable stock share sits at 70% and the headline result is 196 recoverable parts, this scenario comes in 15.71% above the baseline at 227 recoverable parts.
  • Use it during periodic inventory reviews or annual obsolescence provisioning to size your recovery opportunity versus your write-off exposure. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Recoverable obsolescence exposure: 227 recoverable parts (headline result)
  • Gross parts at obsolescence risk: 510 recoverable parts
  • Stock no longer salable: 96.9 recoverable parts
  • Disposition yield loss: 186 recoverable parts

Run it with your numbers

  • Every input above is editable in the live Spare Parts Obsolescence Exposure calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.