FTA Project Properties
The following table describes the properties that appear under FTA in the Project properties.
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Property
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Description
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Default FTA calculation type
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The method selected as the default for FTA calculations in System files, FTA Diagram Library files, and FTA Event Library files that you create in the Project. Choices are:
• Time Dependent — When selected (default), standard time dependent analysis is used to determine availability or reliability.
• Lambda Tau — When selected, Lambda Tau analysis is used to determine availability or short-term reliability when component or system age is unknown or indeterminate.
• SAE ARP4754A and ARP4761 — When selected, these SAE guidelines and methods are used to assess the safety of civil airborne systems and equipment.
In the properties for a System file or an FTA Diagram Library file, you can usually select a different calculation type if no events have been inserted. In the file properties for an FTA Event Library file, you can select a different calculation type only if this file contains no records. For more information, see FTA System File Properties and FTA Support File Properties.
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Hide Functional Dependency gate outputs
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Indicates whether to consider the outputs of a functional dependency gate as inputs of the parent gate. When this checkbox is cleared (default), the outputs of a functional dependency gate are considered as inputs. When this checkbox is selected, the outputs of a functional dependency gate are not considered as inputs. In this case, the connector from the functional dependency gate to its parent gate is shown as a dashed line. For more information, see Functional Dependency Gate.
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