Operations / Manufacturing
Unplanned Downtime
Time equipment was down when it was supposed to be running, and the stop was not scheduled, the loss that hurts most because you did not see it coming.
The fork, why two teams get different numbers
The whole metric turns on where you draw the planned/unplanned line.
In the Metric Library
- The full fork, both definitions worked all the way through
- The trap that makes the number lie, on a real export
- Every formula variant, spelled out
- The reconciliation anchor, what to tie it to and when to refuse
Reference: TPM "six big losses" convention · SEMI E10 equipment-state standard · APICS/ASCM