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MODIFYING CONSTRAINTS

A constraint is used to specify the maintenance interval of a part or an inspection. There are 3 types of limiters: hours, landings, or calendar(D/M/Y). These limiters are used to setup the 3 different types of constraints; Life, Initial and Repeat.

  1. Life Constraint: indicates the life of the part in terms of limiters
  2. Initial Constraint: indicates when the first part check should occur based on the limiter being set
  3. Repeat Constraint: indicates when additional part checks should occur based on the limiter settings until it reaches the Life Constraint limiter value.

Navigation

  1. Click on Item Management and select Item Editor from the pull-down. Click on the binoculars that appear to the right to open the Quick Find.
  2. Using Quick Find, select the desired search type from the pull-down, enter the criteria and click Find.
  3. Select the applicable resultant and click the To Item Editor button. The Quick Find window will close, the window will refresh and display the selected resultant's details.

Part Number Constraints

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Figure 11-1: Next Due

The Part Number detail window is the only location where the constraint and limiter values can be set and adjusted. For demonstration purposes, we have stacked the Life, Initial and Repeat Constraints in Figure 11-1 in order to show all three at the same time. An asterisk (*) on a constraint tab indicates that a limiter has been setup. It may be necessary to select the Track Hours, Track Landings, or Track Calendar checkboxes in order to make the limiter available within each constraint tab.

Next Due

  1. Use the Navigation instructions to locate the appropriate part number. Entered or edit the desired limiter values and a description for each applicable constraint.
  2. Click Next Due. This will re-calculate and update the remaining and Next Due values for all serial numbers associated to this part number.
  3. Click Yes to continue with updating all associated serial numbers.

Save

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Figure 11-2: Save

There maybe instances where you will not want to update the Next Due value for all associated serial numbers. If this is the case, clicking the Save button will only update the limiter values that have changed. See Figure 11-3 for instructions on how to manually update each serial numbers Next Due value.

  1. Use the Navigation instructions to locate the appropriate part number. Entered or edit the desired limiter values and a description for each applicable constraint.
  2. Click Save.
  3. Click Yes to continue saving the limiter values without modifying the Next Due value for all associated Serial Numbers.
  4. Enter the Reason for modifying the limiter values and click Next.

Manual Next Due

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Figure 11-3: Manual Next Due

To manually modify the Next Due value, the constraint status must be set to Pending. For demonstration purposes, Figure 11-3 shows both the Life and Repeat tab details.

  1. Use the Navigation instructions to locate the appropriate part number. Click on the part number to display all associated Serial Numbers. Click on the magnifying glass for the first serial number to display the serial number details window on the right.
  2. Adjust the Due field for each applicable constraint and limiter.
  3. Click Save.
  4. Enter the Reason for modifying the limiter values and click Next.

Constraints in Action

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Figure 11-4: Serial Number Constraints

For demonstration purposes, we have separated the Stats, Life, and Repeat Constraints in Figure 11-3 in order to show all three at the same time. An asterisk (*) on a constraint tab indicates that a limiter has been setup.

  1. Stats tab: indicates the Hours and Landings Since New/Installed/Overhauled and the associated dates.
  2. Life tab: indicates that there are 52,353 landings remaining on this Strut Assembly before it reaches the life span of 60,000 landings.
  3. Repeat tab: indicates that there are 7,353 landings remaining before this Strut Assembly must be removed and overhauled.