Aerospace & Defense Manufacturing worked example

Engineering Change Cost at 99% implementation scope share: a worked example in aerospace & defense manufacturing

This scenario runs the engineering change cost calculation on the strong side: 99% implementation scope share, with every other input held at its documented default. a program manager needs to estimate the manufacturing impact cost of an aerospace engineering change

The inputs for this scenario

  • Affected configuration items: 48 items (unchanged)
  • Implementation cost per affected item: 620 $ / item (unchanged)
  • Implementation scope share: 99 % (raised for this scenario; the documented default is 90)
  • Fixed engineering review and CCB cost: 7,800 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Scoped implementation cost = affected items × cost per item × implementation scope share) to the inputs above produces each figure below.
  • At this operating point the engine returns 37,262 $ change cost for engineering change cost, the number this scenario is built around.
  • At this operating point the engine returns 776 $ / item for cost per affected item.
  • At this operating point the engine returns 29,462 $ change cost for scoped implementation cost.
  • At this operating point the engine returns 7,800 $ for fixed engineering review cost.

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 7.74% above the baseline at 37,262 $ 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. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Engineering change cost: 37,262 $ change cost (headline result)
  • Cost per affected item: 776 $ / item
  • Scoped implementation cost: 29,462 $ change cost
  • Fixed engineering review cost: 7,800 $

Run it with your numbers

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

Last reviewed 2026-05-12.