Modifying Aircraft Forecast

This page allows you to modify the aircraft forecast details. Tell me more.

Select the “Edit Forecast” link in the “Select Forecast” page. Alternatively, select the hyperlinked forecast number in the multiline of the same page.

The “Edit Forecast” page appears.

The system displays the following:

Date Format

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

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

Forecast #

The number identifying the forecast that you wish to modify (Alphanumeric, 40).

Modify the following, if required:

User Status

Use the drop-down list box to assign a user-defined status to the forecast. The system lists all the ‘active’ quick codes of the type “User Status” as defined in the “Create Quick Codes” activity.

The system displays the following:

Start Date

The starting date of the forecast.

Modify the following, if required:

End Date

The ending date of the forecast (Date Format). Mandatory. Ensure that this date is greater than or equal to the “Start Date”.

In case of re-forecasting, ensure that the end date is less than the start date of the next forecast.

The system displays the following in the “Sub Fleet Details” group box:

Sub Fleet #

The number identifying the sub fleet.

Sub Fleet Desc

The textual description of the sub fleet.

Zoom facility available.

The system displays the following in the “Arising Details” multiline:

Aircraft Reg#	The registration number of the aircraft to which maintenance program is mapped.
Work Unit #	The number identifying the task or standard procedure, to be performed as part of the maintenance program.
Work Unit Type	The type of the work unit, which could be “Task” or “Standard Procedure”.
Job Type	The job type of the work unit, which could be “Aircraft” or “On-Wing”.
Earliest Schedule Date	The earliest of all the scheduled start dates of the maintenance activity. Earliest Schedule date =Schedule Date – Negative Tolerance.
Schedule Date	The scheduled start date of the maintenance activity.
Latest Schedule Date	The latest date by which the maintenance activity must be completed. Latest Schedule date =Schedule Date + Positive Tolerance.
Rem. Days	The number of days remaining before the start date of the maintenance activity. The system calculates the remaining date as given below: Remaining Date = Schedule Date - Current Date
Rem. FH	The number of flying hours remaining before starting the scheduled maintenance activity. The system calculates the remaining flying hours as given below: Remaining FH = Schedule Value of FH – Current Value of FH.

Note: The system retrieves the current flying hours from the “Aircraft” business component.

Rem. FC	The number of flying cycles remaining before starting the scheduled maintenance activity. The system calculates the remaining flying cycles as given below: Remaining FC = Schedule Value of FC – Current Value of FC.
Assigned?	Indicates whether the central planner allocated the forecasted work units or not.
Position Code	The position code in the aircraft where the maintenance activity must be performed.
Level Code	The code identifying the level at which the position code occurs in the configuration hierarchy.
Part #	The part required for executing the maintenance activity.
Cycle #	The occurrence of the work unit in the maintenance program.
Sch #	The schedule ID of the work unit
Maintenance Program #	The number identifying the maintenance program with which the aircraft is associated.
Revision #	The revision number of the maintenance program.

Check the box in the “Select” column of the multiline to mark the aircraft for deletion.
Click the Delete icon in the toolbar above the multiline, to delete the aircraft from the aircraft forecast.

To cancel the forecast

Click the “Cancel Forecast” pushbutton to cancel the forecast.

The system does the following:

Changes the status of the aircraft forecast to “Canceled”.

Cancels the ‘Component Maintenance Forecast’ which has reference to the canceled aircraft forecast.
Updates the login user as ‘Last Modified By’ and login date as ‘Last Modified Date’.

To modify the forecast

Click the “Edit Forecast” pushbutton to update the modified details.

The system updates the modified details.

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.

To re-forecast

Click the “Re Forecast” pushbutton to re forecast the scheduled maintenance details.

Note: While re-forecasting for a sub fleet, only those aircraft that are in “Active” status as defined in the “Aircraft” business component, are considered. The earliest schedule date planned for the maintenance activity is also considered while re-forecasting, if earliest schedule date is earlier than the next scheduled date.

The system ensures the following before re-forecasting:

The end date should NOT be less than the starting date of the forecast.
The end date should be less than the starting date of the next forecast.
Schedule date or alert date of the work units displayed as arising details should be within the reforecasted date.

The system performs the following on clicking the “Re-Forecast” pushbutton:

Updates the reforecast details and displays the arising details.
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.
Sets the execution status of each work unit (including those which are retrieved based on the alert schedules) as 'Forecasted'.
Identifies the active aircraft(s) that are associated to the sub fleet.
Generates the Next Scheduled Date (NSD) for tasks with date-based schedule / Next Scheduled Value (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,

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

Date - based forecasting

Retrieves next schedule date of the work unit from the “Maintenance Program” business component, for date based independent schedule of “One Time” or “Recurring” type.

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

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

§ It calculates the Earliest Scheduled Date as

ESD = Schedule Date -- Negative Tolerance

§ It calculates the Lastest Scheduled Date as

LSD= Schedule Date + Positive Tolerance

§ 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.)

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.
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.

Scheduled 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.

Arising Details

If the “Next Schedule Date” is within forecasting start date and end date, then the system lists the “Arisings Details”.
The system lists all the schedule dates for the retrieved schedule number and work unit combination. If more than one schedule date is retrieved,the system applies the “Sch.Execution Rule” as identified in the “Maintenance Program” business component to find the next schedule date.
If the schedule date is less than the forecast start date,the system retrieves the arising details of the maintenance activities only if the previous forecasted workunits are in the “Closed” status.

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 aircrafts 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.

The system displays the following in the “Record Statistics” group box:

Created by	The login ID of the user, who generated the aircraft forecast.
Created Date	The date on which aircraft forecast was generated.
Last Modified by	The name of the user who last modified the aircraft forecast.
Last Modified Date	The date on which aircraft forecast was last modified.

To proceed, carry out the following

Select the “Edit Utilization” link at the bottom of the page to modify the utilization values.
Select the “View Schedule Information” link at the bottom of the page to view forecast schedule details.
Select the “View Related Component Forecasts” link at the bottom of the page to view the component forecast details.

Modifying aircraft forecast details – An overview

This page allows you to edit the details of the forecast that is in the “Fresh” status. You can modify the user status and the ending date of the forecast. You can also reforecast the maintenance schedule in this page. You cancel the forecast that is in the “Fresh” status.