Engineering Orders - Maintenance

Outcome

The engineering order flow results in performed modifications of specified components. The service history and modification status of these components are updated with the required modification.

When modifications are made to a component or a material there is a need to be able to plan, track and record the modification status of components, for example aircraft and engines. For the aviation industry this is due not only to the complexity of an aircraft but also to legal requirements from the different National Aviation Authorities.

Other MRO industries benefit from being able to plan and track modifications in a similar manner as the aviation industry.

Before You Start

• An engineering order type must be defined in 'Engineering Order Type. Open' (MOS222).
• A service with the modification to be performed must be defined in 'Service. Open' (MOS300).
• A document type must be defined in 'Document Type. Open' (CRS236).

Engineering Order Document Structure

Engineering orders are used when an external document is issued. The manufacturer of a component can issue this document. Such a document is often called a Service Bulletin, Alert Service Bulletin or Service Letter. In the aviation industry these documents are often issued as Airworthiness Directives.

The document always suggests that a modification of some kind be performed on a component with a specific serial number. Modifications are performed to improve performance or eliminate safety hazards.

1. Register Document

   The internal document that constitutes the base for the engineering order is based on an external document in most cases. The document contains information about the job that is to be performed, where the original document was issued, what component the job is to performed on, the validity dates etc.

2. Document Effectivity

   The document effectivity defines what component or components are affected by the document. When effectivity is defined, the engineering order program will generate planned work orders only for the objects covered.

   It is for example possible to define a document effectivity for all engines with a specific item number and then limit the effectivity to a range of serial numbers.

3. Additional Information

   It is possible to register additional information for a document. This information includes document alias which is convenient when you have already performed a modification that is the equivalent to the modification described in the document.

Engineering Order Structure

The diagram illustrates the different elements that constitute an engineering order.

As described in the diagram, the engineering order is always based on a document. This document is usually based on an external document. The document is defined with a document effectivity, describing what components are affected by the engineering order.

The engineering order lines contain the service that must be performed before the engineering order is complete.

Register Engineering Order

You can register the Engineering Order document in 'Document. Open' (CRS230). The document is used as the basis for the engineering order program.

1. Engineering Order

   The engineering order consists of a head and lines. The EO contains information about the type of work that is to be performed and the ID of the document triggering the engineering order.

   Engineering orders are entered in 'Engineering Order. Open' (MOS200).

2. Evaluation

   The evaluation allows you to calculate the cost for the planned modification. The calculation considers the number of units affected, the labor cost, the material cost etc. The calculation program also allows the user to define own costs to be included in the calculation.

   The idea behind the evaluation is to assist in the decision whether to perform the modification by gathering all the costs for the job.

   EO evaluations are performed in 'Engineering Order. Open Analysis' (MOS208).

3. Service

   All engineering orders must be connected to a service. The service describes the time and material requirements of the engineering order. The service also facilitates the cost calculation for the engineering order.

   Services are described in 'Service. Open' (MOS300).

4. Engineering Order Program

   The EO-program finds all items that are affected by the engineering order. The EO effectivity defines all items or components that are affected by the engineering order and these are all included.

   The engineering order displays a list including all affected components. This list also provides information about where the component is located and whether the modification is or is not performed.

   It is possible to generate a planned work order for each of the records listed in the EO program. The planned work order can be viewed in 'Work Request. Open' (MOS170) and transformed into a work order. The modification is then treated as a regular work order by the system. The difference is that when the work order is closed, the engineering order is updated as described below.

5. Update Maintenance History

   When a work order that originates from an engineering order is closed, a number of activities are performed.

   The closing activities result in:

   • The engineering order program is updated. This means that the status is set to 80 (sts 80 = Closed – Work Order Completed and modification record updated).
   • The item modification record is updated. This can be viewed in 'Equipment. Display Modifications' (MOS260).
   • The item service history is updated with a record about the engineering order service. This can be displayed in 'Serialized Item. Open Service History' (MOS180).
   • For components that are registered as configurations or are included in a configuration, modifications that are performed on the different subcomponents can be displayed in 'As-Built Structure. Display Modification' (MOS262).