Define Life Limits

Explanation

This activity is used to enter life limits for Life Limited Parts (LLPs) based on stress ratings. Life limits can be defined for all template structures that the LLP can be used in and for all stress ratings that are defined for each template. Life limits are entered in operational parameter values. In addition, life limits can be entered in calendar months from the manufactured date and as the maximum number of repairs possible. The number of days forewarning is entered to identify when a maintenance task should be created before the life-limited serial drops dead. 

To simplify entering this information right-click and click Get Stress Ratings. As a result, all possible combinations of stress ratings and operational parameters will be displayed after which you only need to enter the maximum number of repairs and the life limit values. If stress ratings have been defined in many levels of the template structure(s) where the LLP can be used, only the stress ratings that are defined on the lowest levels, closest to the LLP, are made available for life limit definition. Example: an aircraft consist of an engine which consist of an LLP. If stress ratings are defined on both the aircraft and engine levels, only the stress ratings for the engine will ever be made available to the LLP.

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Prerequisites

To perform this activity, the LLP must be used in a template structure, either as a component or an alternate, where stress ratings have been defined at some level.

System Effects

• As a result of this activity, when operational values are logged, the life of each serial decreases according to the life limit defined for it. 
• The due calculation for life limited parts will run automatically for all affected serials to calculate due dates and values.

Window

Serial Part Revision

Related Window Descriptions

Serial Part Revision
Serial Part Revision/Life Limit
Serial Part Revision/Life Limit/Life Limits 
Change Max No of Repairs and Calendar Life Limit - Dialog Box
Change Life Limit per Part - Dialog Box

Procedure

Use the following procedure to define a life limit for a given stress rating and operational parameter on the LLP:

1. Open the Serial Part Revision window and query (F3) for the necessary LLP.
2. Click the Life Limit tab.
3. In the Days Forewarning field, enter the number of days before the drop-dead date that a task is to be created for the LLP.
4. Save the information (F12).
5. Right-click anywhere in the header of the tab and then click Get Stress Ratings. Stress ratings for all template parts in which the selected part revision is used will be displayed.
6. Locate the row that contains the required stress rating.
7. In the Max No of Repairs field, enter the maximum number of repairs valid for the stress rating.
8. In the Calendar Life Limit field, enter the calendar life limit for the stress rating.
9. In the Task Remark field, enter any additional information on the stress rating. Entering a value in this field is optional. Double-clicking on the field will open a text editor where you can enter text in a more convenient fashion. When an LLP task is created for the stress rating, this information will be transferred to the Task Remark field of the corresponding task record on the maintenance order.
10. Save the information (F12).
11. Click the Life Limits tab.
12. In the Life Limit field, enter the life limit that is valid for the stress rating and operational parameter.
13. Save the information (F12).

Use the following procedure if you want to change the maximum number of repairs and/or the calendar life limit for a given stress rating and operational parameter on the LLP:

1. Open the Serial Part Revision window and query (F3) for the necessary LLP.
2. Click the Life Limit tab.
3. In the Days Forewarning field, enter the number of days before the drop-dead date that a task is to be created for the LLP.
4. Save the information (F12).
5. Right-click anywhere in the header of the tab and then click Get Stress Ratings. Stress ratings for all template parts in which the selected part revision is used will be displayed.
6. Select the row containing the preferred stress rating, right-click, and then click Change Max No of Repairs and Calendar Life Limit. The Change Max No of Repairs and Calendar Life Limit dialog box opens.
7. Enter new values in the Max No Of Repairs field and/or the Calendar Life Limit field.
8. Click OK.

Use the following procedure if you want to change the life limit for a given stress rating and operational parameter on the LLP:

1. Open the Serial Part Revision window and query (F3) for the necessary LLP.
2. Click the Life Limit tab.
3. In the Days Forewarning field, enter the number of days before the drop-dead date that a task is to be created for the LLP.
4. Save the information (F12).
5. Right-click anywhere in the header of the tab and then click Get Stress Ratings. Stress ratings for all template parts in which the selected part revision is used will be displayed.
6. Click the Life Limits tab.
7. Select the row containing the preferred operational parameter, right-click, and then click Change Life Limit per Part. The Change Life Limit per Part dialog box opens.
8. In the Life Limit field, enter the new life limit value.
9. Click OK.