E requirements for scarce logistics resources during

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Unformatted text preview: needed to achieve a particular level of availability, holding other logistics resources fixed. The line between availability models and logistics supportability models can be inexact. Some logistics supportability models may deal with a single resource; others may deal with several resources simultaneously. They may take the form of a simple spreadsheet or a large computer simulation. Greater capability from these types of models is generally achieved only at greater expense in time and effort. The system engineer must determine what availability and logistics supportability models are needed for each new system, taking into account the unique operations and logistics concepts and environment of that system. Generally both types of models are needed in the trade study process to transform specialty engineering data into forms more useful to the system engineer. Which availability and logistics supportability models are used during each phase of the protect life cycle should be identified in the SEMP. Another role for these models is to provide quantitative requirements for incorporation into the system's formal Integrated Logistics Support (ILS) Plan. Figure 27 shows the role of availability and logistics supportability models in the trade study process. Essential to obtaining useful products from any availability and/or logistics supportability model is the collection of high quality specialty engineering data for each alternative system design. (Some of these data are also used in probabilistic risk assessments performed in risk management activities.) The system engineer must coordinate efforts to collect and maintain these data in a format suitable to the trade studies being performed. This task is made considerably easier by using digital databases in relational table formats such as the one currently under development for MIL-STD- 1388-2B. Continuing availability and logistics supportability modeling and data collection through the operations phase permits operations trend analysis and assessment on the system (e.g., is system availability declining or improving?) In general, this kind of analysis and assessment is extremely useful in identifying potential are...
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