Managing Engineering Order Revisions

This document explains how engineering order (EO) revisions are carried out using EO modification control programs. The document explains the EO revision process, from the creation of the EO revision header to the retrieval of serial numbers of the affected components, and through to the approval of the activity list and transfer of the EO revision to production.

Use this process when you have an engineering order that must be revised.


A revised EO exists in ECS200, with a status of 21 (Definite EO transferred to MOS200).

A revised service definition corresponding to the engineering order exists in MOS300, with a status of 21 (Definite service transferred to MOS300) or 31 (Definite and mandatory service transferred to MOS300).

For more information about changes in M3, refer to the documents listed in the See Also section.

The completed modification service allows the engineering order and its components to return to operational status. A component can, for example, return to service after an inspection or component modification imposed by a manufacturer or aviation authority.

Work requests can be created for the revised engineering order in MOS170.

Before you start

Follow These Steps

  1. Create Engineering Order Revision

    Create an EO revision header to describe the revision. The EO header contains information about the modification, the EO document to which it is connected, whether the order is mandatory, and so on. Examples of other information defined in an EO revision header is the latest performance date, the revision date, the affected function area, whether the modification involves an item number change, and whether the modification is mandatory. Also defined in the EO revision header is the reason for the revision.

    Create the EO revision header in 'Engineering Order. Open' (ECS200).

  2. Define Component Modification Reference

    Define component modification reference to specify a modification marking and/or a new item number for items that are modified using EO revision. If a component modification reference is not manually added, one will be auto-created per item when you run the EO revision program to retrieve all affected serial numbers.

    Define the component modification reference in 'EO Revision. Open Component Modif Ref' (ECS212).

  3. Create Service Revision

    Create a service revision to modify the existing service and track history of changes related to the service revision. The service revision contains information about the work center in which the service revision will be performed, the meters that are linked to the service, the service interval if applicable, and the dates between which the modification service is valid.

  4. Connect Service to Engineering Order Revision

    Connect a modification service to an EO revision using an EO line, and register the service in 'EO Revision. Open Lines' (ECS210).

  5. Retrieve Affected Serial Numbers

    Define an EO program to retrieve all the components that are affected by the EO revision. You also create work requests from the EO program.

    Start the EO program in 'Engineering Order. Open' (ECS200). This starts a batch program.

    The results can be viewed and adjusted in 'Engineering Order. Update Affected Serial No' (ECS220).

  6. Approve Activities Related to Engineering Order Revision

    If the engineering order type is defined with activity approval, the activities must be approved before the EO revision can be transferred to production and any work request can be created.

    Approve activities corresponding to the EO revision in 'EO Revision. Open Activity List' (ECS202). Once the EO revision is approved, it becomes valid for use and can be released to production.

  7. Release Engineering Order Revision to Production

    Once the EO revision is released to production, it enters the standard work order flow. This means that the work order is planned along with all other orders in the system.

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