Accession Number : ADA011595

Title :   Aircraft Engines: Demand Forecasting and Inventory Redistribution.

Descriptive Note : Final rept. 15 May 73-15 Mar 74,

Corporate Author : MICHIGAN UNIV ANN ARBOR DEPT OF INDUSTRIAL AND OPERATIONS ENGINEERING

Personal Author(s) : Galliher,Herbert P. ; Wilson,Richard C.

Report Date : FEB 1975

Pagination or Media Count : 152

Abstract : Using historical experience with J79 engines, an investigation was made of the quantitative relationships between engine age, utilization, overhaul-rate, failure-rate, and fleet age-distribution. Based upon these considerations, a new computerized method for forecasting demand for spare engines is proposed to replace present AFM 400-1 procedures. A procedure for redistributing multi-indentured stocks of repairable components and assemblies from depot to base is proposed. The procedure requires forecasts of removal rates, base-to-depot return rates, MOD-METRIC-like stock-allocation levels, repair and ship times as inputs. Whenever a stock unit becomes available at the depot or is required at a base, the procedure determines in real time a stock allocation which seeks to minimize long-run expected system backorders.

Descriptors :   *Jet engines, *Spare parts, *Replacement theory, Inventory control, Logistics planning, Inventory analysis, Failure, Predictions

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE