Generate / Regenerate forecast

 You can select and generate or regenerate aircraft forecast for maintenance activities. Tell Me More

• Select the "Generate / Regenerate  Forecast" link under the "Aircraft Maintenance Forecast" business component.

The “Generate / Regenerate 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 “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:

• Click the hyperlinked Sub Fleet number in the multiline, to view the Sub Fleet details.

    Click the hyperlinked Forecast number in the multiline, to view the forecast details.

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

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

To generate forecast

• Click the “Generate” pushbutton to release the aircraft forecast.

The system generates / regenerates forecast for aircraft and its associated components.

The system updates the Forecasted? flag as follows:

1. From “No” to “Inprogress” on retrieving the details of the Aircraft Reg # in the “Generate / Regenerate Forecast” multiline.

2. From “In-Progress” to “Yes” on completion of generating the forecast for the Aircraft Reg #.

•  You can generate/ regenerate forecast for all the components along with the associated aircraft if the ‘Forecast components along with aircraft’ option in the ‘set options’ page is set as “Required”.

• User can forecast only for those aircraft associated sub fleet to which the login user is mapped as user is the ‘Sub Fleet Security’ option in ‘Maintenance Program’ business component is set as “Required”.

The system performs the following:

• Generates the forecast number as per the selected numbering type.

• Updates the generated forecast number as the ‘Last generated number’ in the “Document Numbering Class” business component.

• Generates component forecasting number, if the option “Forecast Components along with the Aircraft” is set as “Yes” in the ”Set Options” activity.

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.

• Sets the execution status of each work unit as 'Forecasted'.

On successful creation of an aircraft forecast number, the system does the following:

• Identifies the active aircraft(s) that are associated to the sub fleet.

• Retrieves active maintenance programs associated to the aircraft(s), from the “Aircraft Maintenance Program” business component and executes the forecast.

Date - based schedule forecasting

• Retrieves next schedule date of the work unit from the “Maintenance Program” business component, for

1. "One Time" independent date based schedule

2. “Recurring” independent date based schedule which is fixed in (schedule) nature

3. “Recurring” independent date based schedule which is floating in (schedule) nature

• Computes the Alert Date, Earliest Schedule Date and the Latest Schedule Date for the schedule type.

1.  It calculates the Earliest Scheduled Date as

ESD = Schedule Date -- Negative Tolerance

2.  It calculates the Lastest Scheduled Date as

LSD= Schedule Date + Positive Tolerance

3. It calculates the Alert Date as

Alert Date= Schedule Date -- Alert Value (If the tolerance/alert value is given in months / years, then the system will convert it into number of days and perform the calculation.)

Note: If the “Next schedule date” exceeds the “Terminating Date”, then the system will not retrieve the maintenance requirement of the aircraft forecast.

Parameter based forecasting

• Retrives the usage parameter utilization value from the “Edit Utilization” page. If the utilization value is not available at the forecast level, then the utilization value for all the parameters of the sub fleet, identified for each session are retrieved from the “Edit Sub Fleet Utilization” page.

Note: Preference will be given to the utilization values defined at the forecast level.

• If no utilization value is specified at both forecast level and sub fleet level,the system retrieves the usage values of all the consumption parameters that is common for all the aircraft(s) of the sub fleet for which the reference is set as 'Yes', from “Aircraft” business component.

Note: The next scheduled date and alert dates are calculated as done for date - based forecasting.

Schedule date of maintenance arising calculation:

• The system calculates the scheduled date of maintenance arising as follows:

Remaining number of days = Remaining life in terms of parameters / average daily usage value of parameter

Average usage value of parameter calculation:

• If the aircraft reference is set as “Yes”, then the system takes the average value as given. Else, the ‘Forecasting Factor’ is taken and average value is calculated as below

Average value = Forecast factor * average value for the lead parameter.

Component Forecast

• If the option “Forecast Components along with the Aircraft” is set as “Yes” in the ”Set Options” activity, then the system,

• Checks if the aircraft figuring in the current sub fleet has valid “Planner Group” in the “Component Maintenance Planning” business component.

• Checks if the forecasting range of the planner group is same as the sub fleet.

• Checks if the login user has valid permission to generate the forecast, if the option “Component Planning Group Security” is set as “Yes”.

• Checks if the login user is figuring in all the planning group which are getting forecasted, if the option “Component Planning Group Security” is set as “Yes”.

• Identifies the list of components associated with the planner group. Forecasting is performed on all the components of the planner group.

Note: If the “Next schedule date” exceeds the “Terminating Date”, then the system will not retrieve the maintenance requirement of the component for forecast.

• Stores the forecasted output, that is the component ID/work unit details along with the scheduled dates ,with the Job Source as "CMP".

• Identifies the lead parameter and the usage value of the lead parameter for both the aircraft and the component from the "Aircraft" business component, If the component is attached to the aircraft.

Note: If the “Next schedule date” exceeds the “Terminating Date”, then the system will not retrieve the maintenance requirement of the component for forecast.

• 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.

NSD/NSV generation

a. Generates the NSD for tasks with date-based schedule and NSV for tasks with usage based schedule in the following way,

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.

• Updates the NSD and NSV for tasks in the aircraft/component maintenance program.

Generate / Regenerate – An overview

In this page, you can select and generate or regenerate forecast for aircraft and its associated components, for maintenance activities. You can carry out a search based on the Aircraft Reg #, forecast #, sub fleet # and last forecasted user. Based on the search criteria, the system displays the forecast and the sub fleet details.