Failure Rate Type
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Description
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Allocated
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When selected, the failure rate or MTBF is allocated based on the method specified by Allocation method, which appears under Prediction in the System file properties. The default is Base, Non-normalized. For more information, see Prediction System File Properties.
• For an assembly, the form for the selected method is shown in the Allocation pane so that you can specify how to allocate the failure rate or MTBF. For more information, see Allocation Pane (Assembly).
• For a part, the Allocation pane is shown only when Base, Non-normalized or Base, Normalized is the selected method so that you can supply the numeric weight factor that identifies the portion of its parent assembly’s allocated failure rate or MTBF to attribute to this part. For more information, see Allocation Pane (Part).
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Calculated
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When selected (default), the failure rate is calculated using the selected model. Consequently, subsequent fields on the form for supplying either a specified failure rate or MTBF value are unavailable.
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Specified, Failure Rate
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When selected, Failure rate, specified becomes available so that you can enter the failure rate. No calculations are performed when the failure rate is specified. Additionally, all calculated or specified failure rates for the parts in this assembly are ignored.
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Specified, MTBF
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When selected, MTBF specified becomes available so that you can enter the MTBF. No calculations are performed when the MTBF is specified. Additionally, all calculated or specified MTBF values for the parts in this assembly are ignored.
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