Space Payload & Avionics Manufacturing worked example

Engineering Change Cost at 40% share needing requalification: a worked example in space payload & avionics manufacturing

Suppose share needing requalification falls to 40%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimates the cost of processing an engineering change across affected drawings, analysis, and configuration control.

The inputs for this scenario

  • Drawings and Documents Affected: 18 documents (held at the documented default)
  • Update and Review Cost per Document: 1,100 $/document (held at the documented default)
  • Share Needing Requalification: 40 % (the input this scenario stresses; the baseline uses 55)
  • Configuration Board Charge: 7,000 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total cost = documents affected x cost per document x share needing requal + configuration board charge.
  • Total engineering change cost works out to 14,920 $ at these inputs, and this is the headline figure for the scenario.
  • Engineering change cost per unit works out to 829 $ / piece at these inputs.
  • Variable engineering change cost works out to 7,920 $ at these inputs.
  • Fixed engineering change cost adder works out to 7,000 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where share needing requalification sits at 55% and the headline result is 17,890 $, this scenario comes in 16.6% below the baseline at 14,920 $.
  • It computes the fully burdened cost of one engineering change by multiplying affected documents by per-document rework cost, scaling by the fraction requiring requalification, and adding the fixed CCB charge. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Total engineering change cost: 14,920 $ (headline result)
  • Engineering change cost per unit: 829 $ / piece
  • Variable engineering change cost: 7,920 $
  • Fixed engineering change cost adder: 7,000 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Engineering Change Cost calculator, set share needing requalification to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.