Discussion
Arrange the steps of a parametric cost estimate in order:
1. Apply the learning curve across the production run
2. Estimate empty weight and performance from the design
3. Amortise development cost over the planned quantity
4. Compute engineering, tooling and manufacturing hours
Select the correct sequence.
Answer: D
Correct answer: 2, 4, 1, 3
Each step supplies the input to the next. Empty weight and performance are estimated from the design (2), since they are what the cost relations take as arguments. Engineering, tooling and manufacturing hours are then computed from them (4).
The learning curve is applied across the production run (1) to give the cost of each successive aircraft rather than of a notional first unit. Finally the development cost is amortised over the planned quantity (3) and added, giving the cost each aircraft must recover.
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