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Aircraft recoverable spares and depot-level component repair are a major annual expenditure for the Air Force. In the mid-1980s, they absorbed roughly $5 billion annually. In this executive summary, Abell suggests initiatives that will enable the Air Force to reduce its investments in aircraft recoverable spares while maintaining roughly its traditional levels of aircraft availability. These initiatives include fundamental changes in policy as well as improvements in requirements estimation techniques. One policy recommendation is to improve the responsiveness of depot-level component repair. Such improvement includes repairing the components that are the most important to the achievement of aircraft availability goals, minimizing the time parts are in the repair pipeline, and responding quickly to urgent, unanticipated demands. A second policy recommendation is to consolidate the storage and management of war readiness spares.

Airplanes, Military --- Parts --- Costs. --- United States. --- Procurement.

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The Air Force generally overinvests in aircraft recoverable spare parts. In the mid-to-late 1980s, it spent roughly $5 billion annually on these resources, about $3 billion for spares and about $2 billion for repair. The current spares requirements system does not account for many of the uncertainties implicit in requirements estimation, nor for many of the management adaptations that are routinely practiced. This report concludes that substantial cost reductions could be achieved, while maintaining traditional levels of system performance, through the following: (a) modifications to the spares and repair requirements estimation system, (b) initiatives to enhance the responsiveness of depot-level component repair, (c) a massive, intensive effort to clean up the requirements database and maintain it through a system of audits, (d) consolidation of war readiness spares, and (e) technical improvements to the estimation methodology.

Airplanes, Military --- Parts --- Costs. --- United States. --- procurement.

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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 describes Version 6 of the Dyna-METRIC capability assessment model RAND developed to support logistics planning. Using information about the planned usage of aircraft, the characteristics of the aircraft components, and their demand for logistics resources, Dyna-METRIC assesses the effects of wartime dynamics, produces operational performance measures, and identifies potential problems. Version 6 improves upon earlier versions by incorporating a more fully developed representation of the repair process and its constraints. It also considers the effects of additional sources of uncertainty and some strategies that might mitigate that uncertainty. The report provides users with a comprehensive description of the model's motivation, capabilities, methodology, and use. A sample analysis based on 30 avionics components of the F-16C/D aircraft illustrates its use.

Airplanes, Military --- Maintenance and repair --- Mathematical models. --- United States. --- Operational readiness --- Aviation supplies and stores --- Dyna-METRIC.