Entering date-based schedules for a work unit

This page allows you to enter the date-based schedules for the work unit associated with the component maintenance program. Tell me more.

Select the “Edit Date-based Schedule” link at the bottom of the “Edit Component Maintenance Program Information” page.

The “Edit Date-based Schedule Information” page appears.

The system displays the following:

Date Format

The format in which the date and time fields appears in this page. This format is displayed from the "User Preferences" business component based on the login user ID. In case the format is not defined, the system displays the date and time format from the “Enterprise Modeling” business component by default.

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

Part #	The number identifying the part to which the component belongs.
Part Description	The textual description of part.
Serial #	The serial number of the component.
Component #	The number identifying the component for which the date-based schedule details must be updated.
Maintenance Process	Indicates the maintenance process associated with the part, which could be “Hard-Time”, “On-Condition” or “Condition Monitoring”.
CMP Status	The status of the component maintenance program, which could be “Fresh” or “Authorized”.
Revision #	The revision number of the component maintenance program.

Enter the following in the “Maintenance Activity Details” group box:

Work unit #

Use the drop-down list box to select the work unit for which the date-based schedule must be specified. The system lists all the work units except those with Program Item Type-Perpetual and As Required from the part maintenance program; prefixes work units with “TSK”, “SP” or “WP” based on the type of the work unit.

Click the “Get Details” pushbutton to retrieve the date-based schedule details that are already defined for the work unit.

The system displays the following after you click the “Get Details” pushbutton:

Work Unit Description	The textual description of the task, standard procedure or work package.
Maintenance Type	The type of the maintenance activity to be carried out.
Work Center #	The number identifying the work center where the work unit is performed.
Work Center Description	The textual description of the work center.

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” or “One-Time”. The system displays “Recurring” by default.

This field should be set as “One-Time”, if the “Maintenance Type” of the work unit is “Retire”.

The schedule type is mandatory, if Remarks is provided for the maintenance schedule planned for the part.

Last Performed Date

The date and time at which the work unit was last carried out on the component (Date & Time Format). The date and time entered in this field must be in the format displayed in the “Date Format” field and must be earlier than the current system date and time.

Next Scheduled Date	The date and time at which the next work unit is due for the component (Date & Time Format). The date and time entered in this field must be in the format displayed in the “Date Format” field and must be later than the last performed date. Data entry in this field is mandatory if the “Schedule Type” is set as “One-Time” and the “Threshold” field is left blank. You must not enter Next Schedule Date, if the component is not attached in an Aircraft and if ‘Reset on Attachment?’ for the task is selected as “Every Attachment”. NSD display logic: The Next Schedule Date (NSD) is computed as follows: NSD = Last Performed Date & Time + Interval The NSD computed is displayed based on the Process Parameter “Next Due computation logic” defined in the “Define Process Entities activity of the “Common Master” business component. For example, consider that LPD for a task is ‘10/01/2014 11: 00: 00’ and Interval is 15 days. Then NSD is displayed as follows: If the Process Parameter “Next Due computation logic” is set as ‘Exact Date & Time’, NSD is displayed as ‘25/01/2014 11:00:00’. If the Process Parameter “Next Due computation logic” is set as ‘End of Day’, NSD is displayed as ‘25/01/2014 23:59:59’.
Next Due Calc. On	The computation basis of Next Schedule Date (NSD). The system displays various values depending on the basis on which NSD is computed. If the NSD computation basis is ‘Manufacturer Date’, values displayed are: Mfr. Date If the NSD computation basis is ‘Update Basis’, values displayed are: Time Window Schedule Actual Completion If the NSD computation basis is ‘Schedule Reset Basis’, following values are displayed: STE : Actual Completion STE : Last Schedule If the NSD computation is based on the Change Type selection, the system displays the following values: Manual : Correction Manual : Re-baseline If the compliance of parent task triggers Related Task Compliance, the following value is displayed: RTC
Calc. Ref. Date	The reference date based on which NSD is computed.
Last Schedule Date	The actual schedule date of task on last compliance.
Note: On releasing the engineering document, the system updates the NSD / NSV and the NSD / NSV computation basis controls ‘Next Due Calc. On’, ‘Calc. Ref. Date’ and ‘Last Schedule Date / Value’ in various scenarios, as explained in the table.
Change Type	Use the drop-down list box to indicate whether NSD can be modified on modification of interval. The system lists the following values: Correction - Select this option to indicate that the NSD specified can be overwritten on modifying the interval. Re-baseline - Select this option to indicate that the NSD specified cannot be overwritten on modifying the interval. Data selection in this field is mandatory, if ‘Last Performed Date’ or ‘Next Scheduled Date’ is modified. Else you must not select ‘Change Type’. You cannot modify the Change Type, if ‘Interval’ or ‘Threshold’ is modified. By default, the system leaves the field blank.
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 value of the parameter when the schedule will start. Data entry in this field is mandatory if the “Schedule Type” is set as “One-Time” and the “Next Schedule Date” field is left blank. Ensure that the number entered in this field is positive.

Note: If the threshold and next schedule date and time are entered, the system ensures that the next schedule date and time is later than the date and time arrived at by adding the threshold to the component-manufactured date and time.

The system does not perform the above check, if schedule type is “One Time” and if “Last Performed Date” is available for the schedule type “Recurring”.

Interval	The interval in which the work unit is to be repeated (Decimal). Ensure that the number entered in this field is positive.
Alert Value	The value of the parameter before the next arising when an alert needs to be given for the impending work unit execution (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 and time at or after which the maintenance requirements terminates. In other words, the date on or after which maintenance activity need not be performed on the component (Date & Time format). Ensure that the date and time specified in the "Last Performed Date" and "Next Scheduled Date" fields are earlier than the terminating date and time.
Terminating value (days)	The value after which maintenance requirement terminates. In other words, the number of days after which maintenance activity need not be performed on the component (decimal). Ensure that the value given in the "Threshold" field 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 maintenance 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 carried out 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. The system lists / defaults the value “Last Performed Date” if ‘Reset on Attachment?’ is set as “Not Required” and lists / defaults “Installation Date” if ‘Reset on Attachment?’ is set as “First Attachment” / “Every Attachment” in the “Edit Component Maintenance Program Information” page. The system sets this field to “Last Performed Date” by default.

Note: If you have not entered the “Terminating Date” but have specified the “Terminating Value”, then the system calculates the terminating date and time by adding the terminating value to the “Manufacturing Date & Time”. If the “Manufacturing Date & Time” is also not entered, then the system adds the terminating value to the “Component Induction Date & Time” to arrive at the “Terminating Date”.

Remarks

Any comments or supplementary information on the maintenance schedule planned for the part (Alphanumeric 2000).

Click the Remarks icon to display the “View Notes Information” window. You can see the entire history of remarks recorded for the task-parameter till date.

Click the “Edit Date-based Schedule” pushbutton to update the date-based schedule details.

Note: You can update the schedule details for a task only if the maintenance operator associated with the task is also mapped to the login user, if the process parameter "Allow addition/modification of tasks from other Maint. Operator codes in Part Program?" under the 'Tech. Records Process Ctrl' entity type and 'Part Prog' entity is set as '0' for No in the Define Process Entities activity of Common Master.

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

Update of computation basis controls - Section A
Update of computation basis controls - Section B
For "One-Time" and "Recurring" schedules, the system calculates Next Schedule Date on updating the date-based schedule details, based on the value of ‘Reset on Attachment?’, as shown below:

Reset on Attachment?	NSD
Not Required	NSD = Last Performed Date + Interval
First Attachment	If component is attached to aircraft, NSD = Threshold Value + Last Installation Date If component is not attached to aircraft, NSD is updated as blank. Example
Every Attachment	If component is attached to aircraft, NSD = Threshold Value + Last Installation Date If Last Performed Date exists, i.e. task is complied at least once, NSD = Interval + Last Installation Date If component is not attached to aircraft, NSD is updated as blank. Note: If user provides the Next Schedule Date manually, the system saves the user entered value. Further attachment of the component to an aircraft will overwrite the user entered Next Schedule Date.

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

Note: You can modify the Next Schedule Date and Last Performed Date irrespective of the option setting.

Entering date based schedules for a work unit – An overview

This page allows you to enter the date-based schedules for the work unit associated with the component maintenance program. 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 (in which case activities based on usage can be translated into date-based schedules). Routine maintenance based on date schedules has a higher degree of predictability, which inherently increases planning efficiency.

The date-based schedule can be of the recurring (floating) type, or one-time. In case of recurring schedule, the next due date is calculated from the date of execution of the previous schedule. You can specify the date on which the work unit has been last preformed and the next schedule date of the work unit. The update basis is the reference for calculating the next schedule date.

You can specify the threshold value for a date when the work unit execution should begin and the interval in which the work unit execution has to be repeated. You can also specify the alert value for a date after which the corresponding work unit is considered in the component maintenance forecast.

You can specify the positive and negative tolerance, which indicates the limits of the execution date within which the work units is to be performed.

The system updates the date-based schedule details and 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" page.

What you can do in this page

Indicate the schedule type

The date-based schedule can be of the recurring (floating) type, or one-time type. In the case of “One Time” the work unit will be performed only once on a particular date. In the case of “Recurring” the work unit will be performed based on the time intervals.

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 only once on a specified date.