Steps for Performing a Maintainability Prediction
The purpose of a maintainability prediction is to obtain calculated information concerning various aspects of maintenance. To perform a maintainability prediction, you supply repair information for your system so that various maintainability measures can be calculated.
This topic provides guidance on the steps you need to take to effectively and efficiently perform maintainability predictions. In addition to supplying general instructions and descriptions, this topic references other topics where appropriate. These referenced topics typically describe how to perform the actions indicated.
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The actions in the following table are numbered to indicate that they are performed sequentially. For accurate predictions, you must complete these actions in the order in which they are listed.
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Sr.No
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Action
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Description
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1.
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Create or modify Maintainability Task Library files.
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Maintainability Task Library files store all of the tasks and task groups to use in your maintainability predictions. For more information, see Maintainability Task Library Files.
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2.
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Create or modify Maintainability FD&I Library files.
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Maintainability FD&I Library files store FD&I outputs and associated tasks. If repair definitions are always selected from Maintainability Task Library files, you do not need to create Maintainability FD&I Library files. For more information, see Maintainability Groups File.
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3.
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Enter maintainability groups in the Maintainability Groups file.
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The Maintainability Groups file stores the maintainability groups to use when MIL-HDBK-472 Procedure 5A is selected for the maintainability prediction. If you do not use Procedure 5A, you do not need to enter maintainability groups in the Project’s Maintainability Groups file. For more information, see Maintainability Groups File.
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4.
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Create or open the System file; then, define the system hierarchy.
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The System Tree Items table defines the hierarchical structure of the system. To perform maintainability predictions at the piece part (depot) level, you must enter individual parts for each repairable assembly. For more information, see System Definition.
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5.
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Edit properties for system tree items and the System file.
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Every assembly or part in the System Tree Items table has its own properties. If you are using the Maintainability module along with the Prediction module, the General Data pane for an assembly or part provides a checkbox for indicating whether it is repairable. Prior to performing a maintainability prediction, you should carefully review all property data entered for assemblies and parts to ensure that it is accurate.
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6.
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Calculate prediction results.
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If you are using the Maintainability module along with the Prediction module, calculate Prediction results first so that failure rates are available for assemblies and parts.
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7.
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Ensure that the Maintainability support files that you want to use are enabled in the Project.
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Maintainability Tasks and FD&I Output files can reside in the Project or in the Common Library. All Maintainability support files that you want to use must be enabled in the Project. For more information, see Common Library Pane for Common Library Files.
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8.
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For each repairable item in the system, enter maintainability data.
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For each repairable item in the System Tree Items table, enter maintainability data in the Maintainability Data pane. You can enter maintainability data for the assembly or for its individual parts. For more information, see Maintainability How-Tos.
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9.
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Calculate maintainability results.
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Once maintainability data has been entered for all repairable items, calculate Maintainability results. For more information, see Calculating Maintainability Results.
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10.
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Generate maintainability reports.
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Generate maintainability reports.
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