Aerospace & Defense Manufacturing worked example

Engineering Change Cost at 65% implementation scope share: a worked example in aerospace & defense manufacturing

This worked example runs the engineering change cost numbers for a tougher week than the baseline: 65% implementation scope share instead of the typical 90%. Estimate aerospace engineering change cost from affected records or parts, cost per change item, implementation share, and fixed review cost.

The inputs for this scenario

  • Affected configuration items: 48 items (held at the documented default)
  • Implementation cost per affected item: 620 $ / item (held at the documented default)
  • Implementation scope share: 65 % (the input this scenario stresses; the baseline uses 90)
  • Fixed engineering review and CCB cost: 7,800 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Scoped implementation cost = affected items × cost per item × implementation scope share.
  • Engineering change cost works out to 27,144 $ change cost at these inputs, and this is the headline figure for the scenario.
  • Cost per affected item works out to 566 $ / item at these inputs.
  • Scoped implementation cost works out to 19,344 $ change cost at these inputs.
  • Fixed engineering review cost works out to 7,800 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where implementation scope share sits at 90% and the headline result is 34,584 $ change cost, this scenario comes in 21.51% below the baseline at 27,144 $ change cost.
  • Use it when evaluating an ECO/ECN, deciding between immediate and block-point incorporation, or pricing a change for an ECP (Engineering Change Proposal) to the customer. 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

  • Engineering change cost: 27,144 $ change cost (headline result)
  • Cost per affected item: 566 $ / item
  • Scoped implementation cost: 19,344 $ change cost
  • Fixed engineering review cost: 7,800 $

Run it with your numbers

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

Last reviewed 2026-05-12.