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This report proposes a way to think about the investments and operating decisions service maintenance depots must make, distinguishing between a long-run (investment) problem and a short-run (operating) problem. The basis of the authors' approach to both problems involves defining the value of each part or supply action so the costs of parts or supply actions can be related to their effects, thereby permitting managers to select courses of action that maximize value given the cost of the actions. For the long-term problem, the approach attributes value to the units of authorized stock in terms of the effect they have on the value of the repair pipeline: efficient choices yield a cheap repair pipeline. For the short-run problem, the approach attributes value to supply actions (e.g., speedup of delivery of due-in items) in terms of the effect they have on the availability of aircraft at the end of a specific time horizon. For each problem, the authors provide the relevant definition of value, an algorithm to maximize value for a given cost, and methods for computing value

Airplanes, Military --- Spare parts --- Parts. --- United States. --- Aviation supplies and stores --- Mathematical models. --- Inventory control

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This report documents a briefing that presents a method for examining the effect that various stockage policies have on the length of time weapon replaceable assemblies (WRAs) spend waiting for parts. The authors argue that the current stockage policies--which emphasize descriptors of parts and rarely include information about the end-item that needs them--likely contribute to the simultaneous problems of long repair turnaround times (TATs) and excesses of repair parts. The report discusses an algorithm which incorporates both parts descriptors and output measures and which minimizes the expected length of time an end-item spends in repair. The authors' research suggests that through effective stockage of repair parts, the Services may be able to achieve large savings from shortening the TAT at depot, which allows more end-items to be in circulation. Furthermore, the authors' evaluations suggest that their calculations can identify weapons systems where it would make sense to stock parts and those where it would not. The calculations can be used to balance investment strategies between spending money on parts and spending it on other segments of the repair pipeline.

United States. --- Aviation supplies and stores. --- Inventory control. --- Equipment --- Maintenance and repair.

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Military art and science --- Mathematical models.