Accession Number : ADA300683

Title :   Aligning Demand for Spare Parts with their Underlying Failure Mode.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF LOGISTICS AND ACQUIS ITION MANAGEMENT

Personal Author(s) : Kephart, Steven D. ; Roberts, Richard C.

PDF Url : ADA300683

Report Date : SEP 1995

Pagination or Media Count : 213

Abstract : Current Air Force demand forecasting systems, DO41 and REALM, assume reparable demand is solely flying hour driven. The purpose of this study is to evaluate the relationship between demands, flying hours, and number of sorties at the work unit code level and improve reparable demand forecasting. A three phase methodology is used to analyze the demand, flying hour, and sortie relationship. The first phase uses multiple regression to determine a relationship at various work unit code levels. Multiple regression provides limited correlation between demands, flying hours, and sorties. The second phase uses Poisson regression to evaluate the integer, count nature of the demands variable used in the analysis. Poisson regression also exhibits poor correlation between demands, flying hours, and sorties. The third phase fits a Poisson process to the data and produces better results than multiple or Poisson regression. However, the Poisson process performs poorly in estimating future demands at the work unit code level, based on historical flying hour and sortie demand rate occurrences. Despite research at the work unit code level, the study results support previous demand forecasting research, which has been unable to demonstrate an accurate demand, flying hour, and sortie relationship.

Descriptors :   *AIRCRAFT MAINTENANCE, *LOGISTICS MANAGEMENT, *SPARE PARTS, COMPUTER PROGRAMS, MATHEMATICAL MODELS, LOGISTICS SUPPORT, MILITARY SUPPLIES, MILITARY REQUIREMENTS, MILITARY AIRCRAFT, WEAPON SYSTEMS, STATISTICAL DATA, FORECASTING, FAILURE, THESES, AVAILABILITY, CORRELATION, REPAIR, MAINTENANCE MANAGEMENT, LINEAR REGRESSION ANALYSIS, AIR FORCE PROCUREMENT, AIR FORCE OPERATIONS, POISSON EQUATION, STOCKPILES, INVENTORY ANALYSIS.

Subject Categories : Logistics, Military Facilities and Supplies
      Military Aircraft Operations

Distribution Statement : APPROVED FOR PUBLIC RELEASE