PM Extensions (CM) application

You use the PM Extensions (CM) application to define and manage one-time extensions to due dates or meter counts that are associated with preventive maintenance (PM) records.

In the Master PM (CM) and Preventive Maintenance (CM) applications, on the Frequency tab, you select the Extendable check box to specify that associated PMs can be extended. You can create PM extensions in the PM Extensions (CM) application or on the Extensions subtab of the Planning tab in the Preventive Maintenance (CM) application. If you create a PM extension in the Preventive Maintenance (CM) application, a new record is automatically created in the PM Extensions (CM) application.

To specify that the duration of the PM extension is subtracted from the next due date or due count, you select the Subtract Extension From Next Deadline check box. Only the proportion of the extension period that was used is subtracted from the next deadline.

When the related work order is completed, the status of the PM extension is automatically set to complete. Only one active PM extension can be associated with a PM at any time. If you cancel a PM extension, the due date or due count of the PM reverts to the original value.

If you want to permanently extend PM deadlines, you must update the frequency details of the PM in the Master PM (CM) or Preventive Maintenance (CM) application.

Example

A PM is scheduled to run every 100 days and has a due date of 1 Dec 2016. You create a PM extension to extend the due date by 10 days. The following table shows how the next due date of the PM is calculated:

Table 1. Calculation of the next due date
Original due date	Extension	Extended due date	Actual completion date	Subtract Extension From Next Deadline check box	Calculation of next due date	Next due date
1 Dec 2016	10 days	11 Dec 2016	11 Dec 2016	Cleared	11 Dec 2016 + 100 days	21 March 2016
1 Dec 2016	10 days	11 Dec 2016	11 Dec 2016	Selected	11 Dec 2016 + 100 days - 10 days	11 March 2016
1 Dec 2016	10 days	11 Dec 2016	6 Dec 2016	Cleared	6 Dec 2016 + 100 days	16 March 2016
1 Dec 2016	10 days	11 Dec 2016	6 Dec 2016	Selected	6 Dec 2016 + 100 days - 5 days	11 March 2016