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ASM® Home |
Aircraft Sustainability Model® The Aircraft Sustainability Model (ASM®) sparing model is a state-of-the-art method for developing spares requirements to support high-technology systems. Over the last 25 years, the ASM sparing model's advanced algorithms and user interfaces have made it an international leader in computing spares requirements. Managers often need to estimate the spare parts requirements for a system such as a fleet of aircraft or a set of equipment for a particular function (moving oil, producing electricity, etc.) A typical system has many components, such as motors, valves, and pumps. When those components fail, they must be replaced with spare parts before operations can continue. The question that system managers are frequently called upon to answer is the following: What spares are required to support the system over some future period? To answer that question, LMI developed the ASM sparing model, a system-oriented approach to spares management. This approach bases spares requirements explicitly on each item's effect on overall system performance, as well as the item's unit cost. The ASM sparing model measures system performance in terms of availability — the probability that the system is not inoperative for lack of a spare. In this context, a spare's benefit is measured in terms of the projected increase in system availability gained by adding that spare to the inventory. Potential spares buys can then be ranked in terms of benefit divided by cost as a measure of the desirability of adding them to the inventory. Using this process guarantees that the spares mix produced yields the best possible availability for the dollars expended. The ASM sparing model's approach is significantly different from that traditionally used to generate spares requirements. That traditional approach treats all items the same and it sets each item's spares requirement to a level that meets an item-oriented performance measure (such as a stock out protection level, a fill rate, or a confidence level). Thus, while the traditional approach cannot explicitly consider overall system performance nor optimize a constrained total spares budget; the ASM sparing model can. LMI Home > Mathematical Modeling > ASM® HomeAircraft Sustainability Model® and ASM® are registered trademarks of the Logistics Management Institute. |
For more information, contact Rob Kline |
