Date of Award
3-2006
Document Type
Thesis
Degree Name
Master of Science
Department
Department of Operational Sciences
First Advisor
Bradley E. Anderson, PhD
Abstract
In an effort to improve aircraft availability, this research compared the efficiency of ten methods of determining variance-to-mean ratios (VTMRs, VMRs, V/Ms) for repairable, spare aircraft parts known as repairables. These methods are base pipeline quantity, Hill-Stevens (220 LRUs), a variation of Hill-Stevens (10 1s), Hill-Stevens (230 LRUs), the Sherbrooke, a variation of Sherbrooke (10 1s), historical data, a new regression function, variance-to-mean ratio equals 1.00 or variance-to-mean ratio equals 1.01. Using VTMRs derived from quarterly organizational intermediate maintenance (OIM) demands for line-replaceable units (LRUs) from the D200A Secondary Item Requirement System (SIRS) databases in aircraft sustainability model scenarios and Excel spreadsheet simulation, this research concluded the VTMRs have an impact on aircraft availability and the cost of inventory.
AFIT Designator
AFIT-GLM-ENS-06-07
DTIC Accession Number
ADA451295
Recommended Citation
Mahon, Lisa J., "Comparison of Variance-to-Mean Ratio Methods for Repairables Inventory Management" (2006). Theses and Dissertations. 3614.
https://scholar.afit.edu/etd/3614