Aftermarket, Field Service & Service Parts worked example

Mean Time to Repair (MTTR) at 40% diagnosis and verification allowance: a worked example

Push diagnosis and verification allowance up to 40% and the picture changes. This example computes every intermediate figure at that operating point. a maintenance coordinator or service manager needs to estimate average repair duration for a product family or service queue

The inputs for this scenario

  • Repair tasks or service events: 96 tasks (unchanged)
  • Repair completion pace: 0.42 tasks/min (unchanged)
  • Diagnosis and verification allowance: 40 % (raised for this scenario; the documented default is 35)

Working through the calculation

  • Applying the documented formula (Base repair time = repair tasks รท repair completion pace) to the inputs above produces each figure below.
  • At this operating point the engine returns 320 repair hr for mean time to repair estimate, the number this scenario is built around.
  • At this operating point the engine returns 229 repair hr for base repair time.
  • At this operating point the engine returns 40 % for diagnosis and verification allowance.
  • At this operating point the engine returns 0.42 tasks/min for repair completion pace.

How this compares with the baseline

  • Against the tool's baseline example, where diagnosis and verification allowance sits at 35% and the headline result is 309 repair hr, this scenario comes in 3.7% above the baseline at 320 repair hr.
  • It estimates mean time to repair by converting a repair task count and completion pace into base repair time, then inflating it by a diagnosis and verification allowance. 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

  • Mean time to repair estimate: 320 repair hr (headline result)
  • Base repair time: 229 repair hr
  • Diagnosis and verification allowance: 40 %
  • Repair completion pace: 0.42 tasks/min

Run it with your numbers

  • Every input above is editable in the live Mean Time to Repair (MTTR) calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.