Corrective Maintenance Page
The Corrective Maintenance page in the Calculation Properties window for a block specifies corrective maintenance or repair information for the block. The following table describes the properties on this page.
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Property
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Description
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Component is Repairable or Replaceable
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Indicates if the component is repairable or replaceable. When this checkbox is cleared (default), no other properties are available on this page. When it is selected, properties for specifying corrective maintenance information are available.
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General maintenance properties
The properties under this heading provide general information about the corrective maintenance for the component.
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Repair Resource
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The repair resource that performs the maintenance. All repair resources inserted in the Project’s RBD Repair Resources are available for selection. For more information, see RBD Repair Resources Files.
• When None is selected (default), no repair resource is assigned. In this case, it is assumed that maintenance does not need to await the arrival or availability of a repair resource. It also means that an infinite number of repair resources exist for performing this maintenance and that the cost of using these resources is zero.
• When a repair resource is selected, maintenance must await the arrival or availability of this resource.
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When clicked, the Repair Resource window opens, displaying the properties assigned to the selected repair resource in the RBD Repair Resources file. For more information, see Repair Resource Window.
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View Repair Resources file
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When clicked, this link closes the Calculation Properties window and opens the Project’s RBD Repair Resources file. For more information, see RBD Repair Resources Files. If unsaved property changes exist, a window might open for indicating whether you want to save these changes. For more information, see Saving Property Changes.
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Begin Repairs
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Indicates when maintenance can begin. Choices are:
• Immediately. When selected, maintenance can be performed immediately, even when the system is online.
• Upon inspection. When selected, maintenance cannot be performed until the next inspection occurs.
• Upon system failure. When selected, maintenance cannot be performed until the next system failure occurs.
• Upon system failure or inspection. When selected, maintenance cannot be performed until the next system failure or inspection occurs.
• Use default. When selected (default), the choice for Begin repairs (default) in the RBD calculation properties is used for computations. Under RBD in the Calculate window, this property appears on the Advanced page. For more information, see Advanced Page.
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Miscellaneous Cost
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The assorted fixed costs associated with performing maintenance. This cost can include the cost of auxiliary components used during maintenance or any other costs for which you want to account. The default is 0.00.
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Replacement
The properties under this heading indicate how often a component undergoing corrective maintenance is discarded, replaced, or repaired.
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Discard Percentage
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The percentage of time that a failed component is sent to scrap or thrown away because maintenance is not feasible or possible. A discard percentage of 0 (default) means that the failed component is never discarded but is always repaired, either in place or at the repair shop. A discard percentage of 100 means that the failed component is always discarded. When a failed component is discarded, it is replaced with a spare, if one is available. The values entered here and for Replacement Percentage affect the display-only value shown for Restoration Percentage.
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Replacement Percentage
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The percentage of time that a failed component is replaced with a spare and then sent to the repair shop to be fixed. This property and Replacement Time, which is under Maintenance time, are available only if a spares pool is selected for Spares Pool on the Spares Pools page. The default for the replacement percentage 0. The sum of this value and the discard percentage value specifies the total percentage of time that a component is replaced rather than repaired onsite. Once the failed component is fixed at the repair shop, it can be used as a spare.
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Restoration Percentage
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The percentage of time that a failed component is repaired in place. This display-only property is calculated using the following equation:
Repair Percentage = 100 − (Discard Percentage + Replacement Percentage)
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Maintenance time
The properties under this heading display summary information about the time it takes to perform corrective maintenance. For a newly inserted block, the default distribution for all three of these properties is Constant Time with a duration of 0 hours. You use the browse button for these properties to open the Distribution window. In it, you select the distribution and specify or modify the values for its input parameters. For more information, see Distribution Window.
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Logistics time
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The distribution to use for the additional time associated with the repair such as filling in time logs. This time does not include the actual repair time. This additional time is factored into calculations only when operational availability is calculated. If you select the exponential distribution for all three maintenance times (Logistics, Replacement, and Restoration) and enter a non-zero value for this property, RBD results can be calculated analytically versus via simulation.
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Replacement time
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The distribution to use to model the time that it takes to replace the component with a spare. This property is available only if a spares pool is selected for Spares Pool on the Spares page.
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Restoration time
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The distribution to use to model the repair time. When you click the browse button for this property, Renewal percentage is shown in the Distribution window. For more information, see Renewal Percentage.
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