Re-forecast an existing forecast

This page allows you to reforecast an existing forecast. Tell me more.

• Select the "Re-Forecast" link under the "Aircraft Maintenance Forecast" business component.

The “Select Forecast” page appears.

The system displays the following:

• Enter the following fields in the “Search Criteria” group box, to search for an aircraft forecast. Data entry in the following fields is optional:

Note: Leave all the fields blank to search for all the forecasts, which are in “Released” and “Fresh” status and to which the login user is mapped.

• Click the “Search” pushbutton to retrieve the forecast details in the multiline.

The system displays the following fields in the “Search Results” multiline:

Note: Ensure that at least one aircraft forecast is selected in the multiline.

• Check the box in the “Select” column of the multiline to mark the aircraft forecast for re-forecast.

To re-forecast

• Click the “Re-Forecast” pushbutton to reforecast the maintenance schedules.

Note: While re-forecasting, the system considers the earliest schedule date planned for the maintenance activity, if the earliest schedule date is earlier than the next schedule date.

The system performs the following:

• Sets the re-forecast count as “1”. If the maintenance schedules have already been re-forecasted, the current re-forecast count is incremented by 1.

• Displays the “Arising Details” of the forcast in the “Stimulate Re-forecast” page.

• Reforecasts the component maintenance schedules along with the aircraft, if the option “Forecast Components along with the Aircraft” is set as “Yes” in the ”Set Options” activity.

• Generates component forecast number based on the “Forecast Numbering Type” selected in the “Set Options” activity of the current business component.

Note: On automatic generation of the component forecast, the system copies the expense type of the workunits from the component maintenance program to the pending tray.

• Reforecasts the work units that of the current forecast.

Note: The system checks if all work units schedule dates or alert dates are within the re-forecasted date.

• Retrieves work units whose schedule date is less than reforecast start date, if the earlier forecast for the same work unit is in “Closed” status.

• Sets the status of the workunits as “Forecasted”.

• Checks whether the maintenance programs mapped to the aircraft are in “Active” status. If the maintenance programs are in “Inactive” status, then the system removes unallocated work units whose job status is “Pending”, from the reforecasting log.

• For the work unit with date-based calculation for next schedule date, the system updates the triggering parameter as "Calendar" in the "Central Planning" business component.

• For the work unit with usage-based calculation for next schedule date, the system updates the “Triggering parameter” field in the "Central Planning" business component, with the parameter that is used for next schedule date calculation.

• The system calculates and updates the next schedule date, earliest schedule date, latest schedule date and alert date for all the work units that are available in the “Central Planning” or “Component Maintenance Planning” pending trays and are associated with “One Time” direct execution EO(s) or FCD(s) for which the “Usage Based” or “Usage and Date Based” schedules are available.

The system calculates the following:

a. Next Schedule Date

Next Schedule Date = [(Next Schedule Value – Current Value)/Utilization Value] + Current Date

Where, the Next Usage Based Value is retrieved from the “Central Planning” business component.

b. Earliest Schedule Date

Earliest Schedule Date = [(Next Schedule Value – Negative Tolerance)/Utilization Value] + Current Date and Time

c. Latest Schedule Date

Latest Schedule Date = [(Next Schedule Value + Positive Tolerance)/Utilization Value] + Current Date and Time

d. Alert Date

Alert Date = [(Next Schedule Value – Alert Value)/Utilization Value] + Current Date and Time

Note: The system updates the dates for the work units with the earliest of the dates calculated. If both date-based and usage-based information exist for the EO or FCD, the wok unit dates are updated based on both date-based and usage-based information, and the earliest of the calculated date is considered.

• For all the deferred “Maintenance Reports” with “Deferral Limit Type” as “Time Limited” or “Usage and Time Limited” , the system calculates the “Threshold Date” for each parameter as follows:

Threshold Date = [(Threshold Value – Current Value)/Utilization Value] + Current Date and Time

Where, the “Current Value” and “Utilization Value” are retrieved from the “Aircraft” business component,  and the “Threshold Value”  from the “Discrepancy Processing” business component.

Note: Based on the “Deferral Limit Basis” set for the MR in the “Discrepancy Processing” business component, the system updates the “Threshold Date” as the ‘earliest’ or the ‘latest’ of the dates calculated for all the parameters.

e. Next Scheduled Date (NSD) for tasks with date-based schedule / Next Scheduled Value (NSV ) for tasks with usage based schedule

 NSD  = Last Performed Date + Repeat Interval

 NSV  = Last Performed Value + Repeat Value

 NSD for each parameter in the usage-based schedule = ((NSV - Current Value) / Utilization Value + Current Date)

If the task compiled has a short term escalation reference, sets the NSD/NSV of a task on the basis of the Schedule Reset Basis specified in the short term escalation request.

1. If the Schedule Reset Basis is set to “Actual Schedule”, the system derives NSD/NSV for tasks on the basis of the last performed date, as explained previously.

2. If the Reset Schedule Basis is set to “Last Schedule”, the system derives the NSD/NSV in the following way,

i. For date-based schedule: New NSD = NSD + Repeat Interval

ii. For usage-based schedule: New NSV = NSV + Repeat Value

Example

However, an exception to this would arise when a task with a short term escalation request was complied within positive tolerance limits. The system ignores the short term escalation request and computes the NSD/NSV on the basis of the last performed date, as explained previously.

The system also updates the NSD and NSV for tasks in the aircraft/component maintenance program.

To proceed, carry out the following

• Click the “Simulate Re-forecast” link at the bottom of the page, to view the impact of re-forecasting.

• Click the “View Forecast” link at the bottom of the page, to view the forecast details.

• Click the “Edit Utilization” link at the bottom of the page, to modify the utilization value of the sub fleet.

What you can do in this page

Re-forecast maintenance schedules

Re-forecast maintenance schedules

You can re-forecast an already generated forecast, to update the work units that are newly defined in the aircraft maintenance program.

• Search and select the forecast in the multiline.

• Click the “Re-Forecast” pushbutton to forecast the workunits that are newly added in the maintenance program.

Re-forecast an existing forecast – An overview

In this page, you can select and re-forecast schedule maintenance details of a sub fleet. You can carry out a search based on the forecast number, user status, effective period and aircraft registration number. Based on the search criteria, the system displays the forecast and sub fleet details.

The system updates the re forecast count and stores the name of the currently logged in user and current server date.