Recording date-based schedules for a work unit

This page allows you to modify the date-based schedules. Tell me more.

Select the “Edit Date Based Schedules” link at the bottom of the "Edit Work Unit Information in Programs” page.

The “Edit Date Based Schedules” page appears.

Note: This page will be invoked only if “Shelf Life Expiry” flag is set as “No” in the “Edit Work Unit Information In Programs” page.

The system displays the following fields in the “Work Unit Details” group box:

Work Unit Update #	The number identifying the work unit update.
Maintenance Process	The maintenance process of the part, which could be “Hard-Time”, “On-Condition” or “Condition Monitoring”.
Work Unit #	The work unit number for which the date-based schedule details are to be modified.
Work Unit Type	The type of the work unit, which could be “Task” or “Non routine”.
Work Unit Desc	The textual description of the work unit.
Revision #	The revision number of the work unit.

Enter the following in the “Date Based Schedule Details” multiline:

Schedule Type	Use the drop-down list box to specify whether the work unit has to be performed on “Recurring” basis or “One-Time” basis. The system displays “Recurring” by default. This field should be set as “One-Time”, if the “Maintenance Type” of the work unit is “Retire”. Mandatory when Remarks is provided regarding the maintenance program planned for the part.
Time Unit	Use the drop-down list box to specify the unit of measurement of time. The system lists the options “Days”, “Weeks”, “Months”, "Month End" and “Years”. The system displays “Days” by default.
Threshold	The number of days, weeks, months or hours after which the work unit has to be performed (Decimal). Data entry in this field is mandatory if the “Schedule Type” is set as “One-Time”. Ensure that the number entered in this field is positive.
Interval	The interval in which the work unit has to be repeated (Decimal). Data entry in this field is mandatory if the “Schedule Type” is set as “Recurring”. Ensure that the number entered in this field is positive.
Alert Value	The value or date before the arising of the work unit when an alert needs to be given on the impending work unit (Decimal). Ensure that the number entered in this field is positive
Positive Tolerance	The upper limit within which the work unit is to be performed (Decimal). Ensure that the number entered in this field is positive.
Negative Tolerance	The lower limit within which the work unit is to be performed (Decimal). Ensure that the number entered in this field is positive.
Terminating Date	The date, on or after which the maintenance requirement terminates (Date format). In other words, this denotes the date after which the maintenance activity cannot be performed on the component. Ensure that the dates specified in the "Last Performed Date" and "Next Scheduled Date" fields are earlier than the terminating date.
Terminating value (days)	The value after which maintenance requirement terminates (Decimal). In other words, this denotes the number of days after which the maintenance activity cannot be performed on the component. Ensure that the "Threshold" value is less than the terminating value.
Update Basis	Use the drop-down list box to specify the basis of updating the work units of the part program. The system lists the following options: “Last Performed Date” – Select this option if you wish to update the work units on the date on which the work unit was last executed on the component. “Installation Date” – Select this option if you wish to update the work units on the date on which the component was installed on the aircraft. By default, the system sets this field to “Last Performed Date”.
Remarks	Any comments or supplementary information on the maintenance program planned for the part.

Note: Ensure that at least one schedule detail is entered in the multiline.

Click the “Edit Date Based Schedules” pushbutton to update the date-based schedule details.
If you have modified the schedules and the status of the program is “Authorized”, then the system creates a new revision of the program with the status as “Fresh”.
If the “Action” field is set as "Append", the system updates the date-based schedules that do not exist for the work unit in the part program or CMP.
If the “Action” field is set as "Overwrite", the system overwrites the date-based schedules with the schedules provided in this page for the work unit in the part program or CMP.
If the updation status of the work unit is “Authorized”, the system will not allow you to make any changes to the schedule, or delete a record in the “Date Based Schedule Details” multiline.
If the Eng. doc reference # exists for the task, the system allows you to modify the following schedule details of the Eng. Doc. task in the Maintenance Program, only if the process parameter “Allow modification of Eng. Doc. task in Maintenance Program” is set as “Allowed” in the “Define Process Entities” activity of the “Common Master” business component.

Schedule Type
Update Basis
Date Based Schedule details

Calculation of Next schedule date

The system performs the following on updating the date-based schedule details:

For “One-Time” schedule, if “Component #” field is entered and if “Action” is selected as “Append” or “Overwrite”, the system calculates the “ Next Schedule Date” as follows:

Next scheduled date = Threshold Date (If available) + Induction Date

Next scheduled date = Interval + Manufactured Date (OR) Induction Date

For the “Recurring” type of schedule, the system calculates the “Next Scheduled Date” as follows:

Next Scheduled Date = Threshold Value (if available) + Induction Date

Next Scheduled Date = Interval + Manufactured Date (OR) Induction Date

Recording date-based schedules for a work unit – An overview

This page allows you to modify the date-based schedules. Date-based schedules have their periodicity defined in terms of calendar days. The schedule for the next performance of the maintenance activity will be specified in terms of a calendar date.

Date-based schedules are employed for maintenance activities which are to be performed irrespective of the asset usage or if the asset has a constant usage pattern. If the asset has a constant usage pattern, the activities based on usage can be translated to date-based schedules. Routine maintenance based on date schedules has a higher degree of predictability, which inherently increases planning efficiency.

When a work unit of type "Work Package" is added and if schedules are already defined for the work package in the "Create Work Package" activity, then the system considers those schedules to arrive at the next schedule date. If a "threshold date" is provided, then this date is considered as the "Next Schedule Date". If "threshold date" is not provided, the system adds the "Interval" to the "Manufacture Date" of the component (defined in the "Aircraft" business component) to arrive at the "Next Schedule Date". If the manufacture date is also not available, the "Interval" is added to the "Component Induction Date" to arrive at the "Next Schedule Date".

The date-based schedule can be of two types: recurring (floating) and one-time. In case of recurring schedule, the next due date is calculated from the date of execution of the previous schedule. In case of “One-Time” you can specify the maximum number of days, weeks, months or years within which the work unit has to be executed.

The Alert value specifies the days after which the corresponding work unit is considered in the component maintenance forecast. You can also specify the positive and negative tolerance, which indicate the limits within which the work units are to be performed.

The system updates the date-based schedule details for the work unit in the part programs or the component maintenance programs specified in the main page. It also stores the name of the currently logged in user and the current server date.

Note: The system will not allow you to define date based schedules for a work unit if the shelf life expiry field for that work unit is set to "Yes" in the "Edit Component Maintenance Information" page.

What you can do in this page

Indicate the schedule type

The date-based schedule can be of two types: recurring (floating) interval and one-time. In case of “One-Time” the work unit will be performed on a particular date. In case of “Recurring” the work unit will be performed based on the time intervals. Also, the basis of updating the work unit execution can be of last performed date or installation date type.

Set the “Schedule Type” field as “Recurring” to indicate that the work unit is to be performed in repeated intervals.
Set the “Schedule Type” field as “One-Time” to indicate that the work unit is to be performed on a specified date.
Set the “Updation Basis” field as “Last Performed Date” to update the work unit by the date on which the work unit was last executed on the component.
Set the “Updation Basis” field as “Installation Date” to update the work unit by the date on which the component was installed on the aircraft.