A Model for Estimating Aircraft Recoverable Spares Annual Costs
Abstract
This thesis covers three objectives: (1) develop a background reference document concerning recoverable spares cost estimating; (2) evaluate a representative sample of existing spares cost models; and (3) use aircraft physical and performance characteristics to develop a model for estimating annual replenishment spares cost. A condemnations cost estimating relationship (CER) was developed first and then both a CER and spreadsheet generated factors which related condemnations to replenishment spares costs were developed. For the condemnations CER, only logarithmic transformations provided statistically acceptable results, and even these models exhibited wide prediction intervals due to large amount of variability in the CER databases (as evidenced by the number of outliers). The CER relating condemnations to replenishment spares costs was a poorer statistical performer. Spreadsheet generated factors showed that the ratio of replenishment spares requirements to condemnations exhibited a downward trend across the data years.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1991
- Accession Number
- ADA243920
Entities
People
- Phillip L. Redding
Organizations
- Air Force Institute of Technology