asent_mttr_lab.ppt slide 1 maintainability prediction lab last revised 02/09/2011

ASENT_MTTR_LAB.PPT

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Maintainability Prediction LabLast revised 02/09/2011

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Introduction

This lab will walk the user through the steps involved in performing a Maintainability Prediction using ASENT.

For this lab we will use the product tree that was created as part of the Failure Rate Prediction lab exercise. Please complete this exercise before proceeding with the Maintainability lab.

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Section 1: Creating A Project Scenario

This lab will leverage off of the product tree structure that was created in the Failure Rate Prediction lab. The first thing we will do is enter the Maintainability Manager and define the active scenario. Once this is complete then we will import the product tree structure that was used for the reliability prediction.

The slides that follow will guide you through these steps.

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Invoking the Maintainability Manager

From ASENT’s Session Manager the Maintainbility tool is invoked by right-clicking on the class project and selecting the Maintainability Manager option.

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Create New FRP Scenario

To create a new Maintainability scenario, fill in the information as shown in this example, then click on the Save button.

You can have multiple “What-if” scenarios for each project. These are helpful for performing trade-offs. To create other scenarios use the File | New options.

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Import Reliability Product Tree

A good starting point for our Maintainability analysis is to import the product tree from our reliability prediction. We can then add any covers or additional hardware later.

Right-click on the project node and select the Import | Reliability options. Click the OK button and click Yes to overwrite the tree.

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Section 2: Editing the Maintainability Tree

The next thing we will do is add covers, access panels, or other hardware that is normally excluded from the reliability prediction. ASENT’s Maintainability Manager gives you full tree editing The slides that follow will guide you through the steps of adding new items to your product tree for the Maintainability Analysis.

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Adding an Access Panel – Step 1

We are going to add an access panel to our tree structure that will be associated with the subsys1 subassembly.

Click on the ‘+’ symbols to expand the tree structure and then right-click on ‘subsys1’ and select the ‘Add’ option from the drop-down menu.

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Adding an Access Panel – Step 2

Fill in the data, as shown, then click on the Save button.

Here, we are adding an access panel to our Maintainability product tree.

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Access Panel is Added

This screen shows the new access panel that was just added when you clicked on the Save button.

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Detailed Task Information

Once your product tree structure has been edited for your analysis you are now ready to manage the detailed task information associated with each item.

This includes tasks associated with Fault Detection and Isolation, and items that must be Disassembled or Reassembled to reach the item of interest, Remove and Replace Tasks, Alignment/Adjustment tasks, and Verification Tasks. You can also enter Judgments for cautions, notes, or as difficulty factors for working in cramped or adverse conditions.

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Detailed Task Information

ASENT’s Maintainability Manager is used to manage the scenario tree, its corresponding tasks and any Maintainability predictions associated with it. It references tasks and task groups from the Maintainability library.

The Maintainability Data Manager is the tool in ASENT where you define new tasks, or task groups, and tools in your library.

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Section 3: Managing Your Maintainability Library

Two task libraries are pre-populated in ASENT: COMMON_M472 and COMMON_RADC.

The COMMON_M472 library contains all of the tasks and task times associated with Mil-Hdbk-472.

The COMMON_RADC library contains all of the tasks and task times associated with RADC-TR-84-165.

You can define task categories and tasks or task groups for any project that you are assigned to. A yellow folder next to a project indicates that you have editing privileges on that project.

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Adding a Maintenance Task – Step 1

We are going to add a maintenance task to the FRP library. Since this library does not have any categories you will need to add one.

Click on the ‘+’ symbols to expand the tree structure and then right-click on the ‘FRP’ project and select the ‘Add Category’ option from the drop-down menu.

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Enter ‘cat1’ for the task category and click on the Save button.

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Now that a category exists we can add a maintenance task. There are two types of tasks. The ‘Remove/Replace’ task is used specifically for tasks associated with removing and replacing items. ‘Other’ tasks are used for any other situations.

Right-click on ‘cat1’ and select the Add Task | Add Remove/Replace Task options.

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Enter the information for the task as shown and click on the Save button.

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Task Groups

Maintenance Task Groups represent a set of maintenance tasks. For example, you may define an Engine Repair as a Task Group, and it would list all of the tasks associated with an engine repair.

The slides that follow will walk you through the creation of a task group.

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Adding a Task Group – Step 1

To define a task group, click on the ‘Task Groups’ tab and click on the ‘+’ symbol to expand the Task Groups tree.

Right-click on your project and select the Add option.

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Fill in the information as shown, and click on the Save button.

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Click on your newly created task group then click on the ‘Task Group Tasks’ tab.

Right-click on the name field grid and select the Add option from the menu.

The select task window appears. Expand the task tree in order to select tasks.

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The Select Task window allows you to navigate to any task library that you want to and select tasks to be added to your task group. Select a task and click OK and it will be added to the task group.

Click OK once you have selected 5 tasks in a similar fashion.

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You can enter skill codes if you like. These are free-form fields. In our example the A represents Avionics, and E represents Electrical, but you can use whatever you like. You can also edit the Quantity and Number of People associated with each task.

The second screen shot shows the display when you click on the Task Group tab. Here it shows you the information associated with the Task Group for all of its tasks.

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Section 4: Tasks, Task Groups, & Judgments

Detailed tasks and judgments can be associated for each item in your scenario tree. The Maintainability Manager allows you to easily reference tasks and task groups from the library, and define judgments for cautions, notes, or as difficulty factors for working in cramped or adverse conditions.

The slides that follow provide examples of this.

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Select the Access Panel and click on the button next to the Remove Time Field.

The Edit Remove Tasks window appears.

Defining Tasks – Step 1

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The Edit Remove Tasks option allows you to select tasks and task groups from the library, and define judgments.

Right-click on the grid and select the Add Task | All option.

The Select a Task window then appears so that you can select a maintenance task from the library. These tasks are maintained by the Maintainability Data Manager. Here, you are selecting maintenance tasks from the library.


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Select the ‘+’ symbol to expand the tree and open up the FASTENERS folder under the COMMON_M472 project library.

Select the M-001 – Standard Screw, Fastener and click on the OK button.


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The task appears in the Edit Remove Tasks grid. Here, you can modify the # of People needed to perform the task, enter skill codes, and modify the quantity.

You can also enter a more descriptive explanation of this task in the Narrative field.


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We have now entered a maintenance task associated with the Access Panel.

Next, we will enter a task group. Right-click on the first row in the grid and select the Add Task Group option.

Select Task Group 1 from the Select Task Groups list and click on the OK button.

Defining Task Groups - Step 1

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Task Group 1 now appears in the Edit Remove Tasks window. Here, you can enter skill codes or adjust the quantity information if desired.

Defining Task Groups - Step 2

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Judgments have many uses. They can be used to create a warning, caution, or note for the maintainer, or they can be used as a difficulty factor to add additional time for working in cramped or adverse conditions. They can be associated with a specific task, or be non-specific and generally applicable for the item you are repairing.

Defining Judgments - Step 1

Right-click on the second row of the Edit Remove Tasks grid and select the Add Judgement | Non-Task Specific | Judgement options.

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A non-task specific judgment appears in the Edit Remove Tasks window.

Here, we add 2.0 minutes and document in the Narrative field the reason.

Click the OK button.

Defining Judgments - Step 2

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Section 5: Defining Replace Tasks

Normally, the tasks performed to replace or install an item are essentially the same as the tasks used to remove the item (only in the opposite order).

The slides that follow provide a shortcut for accomplishing this.

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Notice that the Remove Time value now reflects the time associated with the Remove Tasks that we defined earlier.

To define Replace Tasks associated with the Access Panel, click on the

button next to the Replace Time field.

Defining Replace Tasks - Step 1

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Right-click on the first row in the grid and select the Default to Inverse of Remove Items option, and click on the Yes button when the confirmation window appears.

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Notice, that the remove tasks appear in the reverse order, with their corresponding replacement times.

You can use the Up | Down arrows to reposition the tasks if necessary, and add any additional tasks that may be required.

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Section 7: Copying Tasks

Follow the same steps that you learned earlier, and add the two remove tasks shown below for board1. The slides that follow will show you how to copy tasks from one item in your scenario tree to another.

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Copying Tasks - Step 1

ASENT allows you to easily copy tasks from one item in your Scenario Tree to another.

Right-click on board1 and select the Copy Node Data option.

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Copying Tasks - Step 2

To paste tasks from board1 to board2, right-click on board2 and select the Paste Node Data option.

The ‘Select Fields to Copy’ window will then appear, and give you the option of deselecting some of the fields, if desired.

Click on the OK button, and then click Yes when the confirmation window appears.

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Section 7: Disassembly/Reassembly Items

Disassembly/Reassembly Items account for the items that must be moved out of the way in order to reach the item of interest. Covers and Access Panels are good examples of these. Another example might be where a mother board has other cards plugged into it. These cards would be considered disassembly/reassembly items if we were changing out the mother board.

The slides that follow provide examples of working with disassembly/reassembly items and their associated access and close-up tasks.

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Defining Disassembly Items - Step 1

Disassembly items represents items that must be moved out of the way to get to the item of interest.

To specify disassembly items associated with board1, click on the button next to the Disassembly Time field.

Additional Access tasks may also be needed. Click on the second button next to Disassembly Time to enter these.

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Defining Disassembly Items - Step 2

In this example, the Access Panel needs to be removed to get to board1, so it would be considered a disassembly item associated with board1.

Click on the Access Panel and then select the button with an arrow pointing to the right.

This will move it into your list of selected items. Click on the OK button.

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Notice, that the Disassembly Time is now populated to reflect the fact that the Access Panel is a disassembly item.

Now, let’s define Reassembly items for board1. Click on the button next to the Reassembly Time field.

Additional Close Up tasks may also be needed. Click on the second button next to Reassembly Time to enter these.

Defining Reassembly Items - Step 1

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Normally, items that we have to move out of the way to reach an item need to be put back once the repair is complete. In most cases the reassembly items are just the disassembly items in the reverse order.

Right-click on the Access Panel and select the Default to Inverse of Disassembly option.

Click on the Yes button when the confirmation window appears.

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The Access Panel moves over into the Selected Items list. Click on the OK button.

The Reassembly Time is now filled in for board1.

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Section 8: Creating a Maintainability Prediction

You have now successfully defined detailed task data for some of the items in your scenario tree. We will utilize this information in a simple maintainability prediction.

The slides that follow provide examples.

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Maintainability Predictions - Step 1

Previously we had been working in the Scenario Tree.

To create a prediction, click on the Predictions tab.

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Modify the Prediction defaults as shown here, and click on the Save button.

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To create a new prediction using the defaults that you selected, right-click on the Predictions item and select the Add option.

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For this example, click on the OK button.

When adding a new maintainability prediction, you have a lot of flexibility to control what is automatically brought in from the scenario tree. The default option will bring in all items from the scenario tree, but you can choose to bring in only items marked with a certain assembly type (e.g. LRU) or with certain SMR Codes.

If the Add individually option is selected nothing will be brought into the prediction, but from the prediction you can add items one at a time or select multiple items to be brought in. Selecting the Cancel button aborts the creation of the prediction.

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Enter I Level for the Prediction Name and click on the Save button.

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Click on the Corrective Maintenance tab to refine your prediction information. Here, you can add or delete items, and user-set values to perform quick trade-offs. When you uncheck a user-set value then it will revert back to the calculated value if detailed task information exists for the item.

By clicking on the splitter bar, the right side of the screen will become full screen. If you click it again then it will go back to the original layout.

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You can see prediction results at a glance by clicking on the Prediction Results tab.

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Section 9: Generating Reports

You can generate reports from both the Scenario tree or the Predictions view. All of the reports generate a familiar Excel spreadsheet format.

The slides that follow provide examples.

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Maintainability Reports - Step 1

Right-click on your prediction and select the Reports | Procedure 2 Prediction options.

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It is not uncommon to see this confirmation window when you run a report. If any values in your prediction have been user-set or defaulted then they will not match the details in your scenario tree, and in this case you would get this warning message.

Click No to acknowledge the message, but don’t worry about having it update the prediction prior to the report. We are receiving the message because we defaulted some of the prediction values.

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Click the OK button to generate the report. A sample Procedure II Prediction report is shown below.

asent_mttr_lab.ppt slide 1 maintainability prediction lab last revised 02/09/2011

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