Elevators, Escalators & Vertical Transport Equipment worked example

Test Tower Capacity at 63% test tower uptime: a worked example

This worked example runs the test tower capacity numbers for a tougher week than the baseline: 63% test tower uptime instead of the typical 88%. Estimate elevator test tower capacity from units per test slot, available slots, tower uptime, and first-pass test yield.

The inputs for this scenario

  • Elevator units per test slot: 1 units / slot (held at the documented default)
  • Available test tower slots: 36 slots (held at the documented default)
  • Test tower uptime: 63 % (the input this scenario stresses; the baseline uses 88)
  • First-pass tower test yield: 96 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross tower test capacity = elevators per test slot × available test tower slots.
  • Accepted test tower capacity works out to 21.77 elevator units at these inputs, and this is the headline figure for the scenario.
  • Gross tower test capacity works out to 36 elevator units at these inputs.
  • Units lost to tower downtime works out to 13.32 elevator units at these inputs.
  • Units held for adjustment or retest works out to 0.91 elevator units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where test tower uptime sits at 88% and the headline result is 30.41 elevator units, this scenario comes in 28.41% below the baseline at 21.77 elevator units.
  • Use it when planning test tower throughput, committing ship dates, or quantifying how much capacity retest and downtime are consuming. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Accepted test tower capacity: 21.77 elevator units (headline result)
  • Gross tower test capacity: 36 elevator units
  • Units lost to tower downtime: 13.32 elevator units
  • Units held for adjustment or retest: 0.91 elevator units

Run it with your numbers

  • To rerun this with your own numbers, open the live Test Tower Capacity calculator, set test tower uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.