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.
on the that are available are the ones that are
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:
- Open the Serial Part Revision window and query (F3) for the
necessary LLP.
- Click the Life Limit tab.
- 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.
- Save the information (F12).
- 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.
- Locate the row that contains the required stress rating.
- In the Max No of Repairs field, enter the maximum number of
repairs valid for the stress rating.
- In the Calendar Life Limit field, enter the calendar life limit
for the stress rating.
- 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.
- Save the information (F12).
- Click the Life Limits tab.
- In the Life Limit field, enter the life
limit that is valid for the stress rating and operational parameter.
- 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:
- Open the
Serial Part Revision
window and query (F3) for the necessary LLP.
- Click the
Life Limit
tab.
- 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.
- Save the information (F12).
- 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.
- 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.
- Enter new values in the Max No Of Repairs field and/or the Calendar Life Limit field.
- 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:
- Open the
Serial Part Revision
window and query (F3) for the necessary LLP.
- Click the
Life Limit
tab.
- 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.
- Save the information (F12).
- 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.
- Click the Life Limits tab.
- 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.
- In the Life Limit field, enter the new life
limit value.
- Click OK.