Industrial Equipment, Machinery & Capital Goods worked example

FAT Workload at 35% retest and customer witness allowance: a worked example in industrial equipment, machinery & capital goods

What does the result look like when retest and customer witness allowance reaches 35%? The full calculation is worked below with real intermediate numbers. Use it when planning test technicians, controls support, customer witness time, and documentation for FAT.

The inputs for this scenario

  • FAT checkpoints and test cases: 180 checks (unchanged)
  • FAT completion throughput: 14 checks / hr (unchanged)
  • Retest and customer witness allowance: 35 % (raised for this scenario; the documented default is 30)

Working through the calculation

  • Applying the documented formula (Base FAT time = FAT checkpoints and test cases รท FAT completion throughput) to the inputs above produces each figure below.
  • At this operating point the engine returns 17.36 hr for required fat workload, the number this scenario is built around.
  • At this operating point the engine returns 12.86 hr for base fat time.
  • At this operating point the engine returns 35 % for retest and customer witness allowance.
  • At this operating point the engine returns 14 pieces / min for fat completion throughput.

How this compares with the baseline

  • Against the tool's baseline example, where retest and customer witness allowance sits at 30% and the headline result is 16.71 hr, this scenario comes in 3.85% above the baseline at 17.36 hr.
  • A figure at this level is achievable when retest and customer witness allowance is genuinely sustained, not just peaked for a shift. It assumes a steady checks-per-hour throughput; in reality the first few checks and any failed checks take far longer than the average, so treat the result as a planning midpoint, not a hard floor.

Results at a glance

  • Required FAT workload: 17.36 hr (headline result)
  • Base FAT time: 12.86 hr
  • Retest and customer witness allowance: 35 %
  • FAT completion throughput: 14 pieces / min

Run it with your numbers

  • Every input above is editable in the live FAT Workload calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.