Aviation maintenance Business Information Requirements

Section: Business overview provided a high level overview of the business information that can be represented by this DEX. This section provides a more detailed overview of that information. A description of how to represent this information using ISO 10303-239 PLCS is provided in Section: Aviation maintenance: ISO 10303-239 Representation.

Information

A detailed view of the information to be exchanged is provided by the UML model in Figure 7.

NOTE    The information shown in the UML class diagram in Figure 7 is intended to illustrate the type of information that can be represented by the DEX. It does not imply that all exchanges must contain this information.

Figure 7 —  UML model representing information that can be exchanged

The information detailed in the UML class diagram in Figure 7 is as follows:

End_reportable_item

The end item to which the reportable item is fitted. Normally the aircraft.

Engineering_instruction

An instruction to perform a task on a specified end equipment type (such as Jaguar T.2 or Liferaft MS10), asset (such as wings, engines with serial numbers 123 to 135), equipment item, engineering standard or document. Engineering Instructions (EIs) include all types of tasks, such as Service Engineered Modifications (SEMs) and Special Trial Fits (STFs), once-only instructions such as Routine Technical Instructions (RTIs) and Urgent Technical Instructions (UTIs), and repeated instructions such as Servicing Instructions (SIs). Different types of EI can apply to an aircraft at any one time. EIs are the main authority for making changes, although changes to part numbers may also be effected by a design amendment and changing the life or required maintenance of an item may also be effected by the Engineering Authority, without an EI (provided that the part number does not change).

Engineering_instruction.identifier

Engineering Instruction identifier

Engineering_instruction.type

Engineering Instruction type

Fault

A fault is an unexpected deviation from specifications which will require considered action regarding the degree of acceptability. Such a deviation could be either total or partial. Faults manifest themselves as symptoms.

Fault.description

Description of a recorded fault

Fault.fault_code

Code representing the Fault.

Fault.identifier

A unique identifier of the fault occurrence.

Fault_status

The status of the fault.

Fault_status.deferred_to

An indication as to whether the fault has been deferred. I.e. it is noted as being deferred and the metric to which the fault has been deferred to for reinvestigation is agreed. This could be a date, or any other life metric as specified in the attributes deferred_to_date and deferred_to_metric.

Fault_status.deferred_to_date

The date on which the deferred fault is to be reinvestigated.

Fault_status.deferred_to_metric

The life metric at which the deferred fault is to be reinvestigated. E.g. after 100 flying hours address the fault.

Fault_status.description

Description of the fault status

Fault_status.status

The status of the fault. Either:

Raised

Acceptable deferred fault (ADF) - this should have dated effectivity, date, any life measurement unit, e.g. landings, flights, service

Limitation - this should have dated effectivity

Closed

Installation_history

A history of what a reportable item has been installed on.

Installation_history.end_asset_installation_date

Date_Time a reportable item was fitted to an End Asset

Installation_history.end_asset_removal_date

Date_Time a reportable item was removed from an End Asset

Installation_history.installation_date

Date_Time a reportable item is installed into a Parent Asset

Installation_history.removal_date

Date_Time a reportable item is removed from a Parent Asset

Inventory_activity

An activity that affects the inventory.

Limitation

A deferred fault may impose limitations on the usage of the asset.

Limitation.description

A description of the limitation

Location_history

A record of the changes to the location of a reportable item.

Location_history.end_location_date

Date_Time when reportable item is no longer held at the Organization or Physical Location

Location_history.organization_location

Organization location of the reportable item

Location_history.physical_location

The geographical location of the reportable item. E.g. RAF Wyton.

Location_history.start_location_date

Time the Change of Location of the reportable item is effective from

Location_history.status_at_exchange

Serviceability Status of the reportable item at the time of a Change of Location

Maintenance_activity

A maintenance activity that has been carried out on a reportable item and is to be reported on.

Maintenance_activity.accomplished_hours

The actual hours spent so far undertaking the activity.

Maintenance_activity.actual_end_date

Date_Time the activity recorded on the Maintenance Work Order was completed

Maintenance_activity.actual_start_date

Date_Time the activity recorded on the Maintenance Work Order commenced

Maintenance_activity.approval

The approval for the activity. Note - this may be provided by the maintenance work order

Maintenance_activity.contract

The contract under which the activity was undertaken

Maintenance_activity.expected_hours

The number of hours that a given task is expected to take

Maintenance_activity.percentage_complete

An estimate of how complete the work being carried out on Maintenance Work Order is.

Maintenance_activity.planned_end_date

Date_Time the activity recorded on the Maintenance Work Order was planned to finish

Maintenance_activity.planned_start_date

Date_Time the activity recorded on the Maintenance Work Order was planned to commence

Maintenance_activity.work_done_text

Textual Summary of action carried out

Maintenance_work_order

The authorization for aircraft or component maintenance work.

Maintenance_work_order.actual_end_date

Date_Time the Maintenance Work Order was completed

Maintenance_work_order.date_raised

Date_Time the Maintenance Work Order was raised

Maintenance_work_order.description

Description of the Work Required as recorded on the Maintenance Work Order

Maintenance_work_order.identifier

Identifier of the Maintenance Work Order

Maintenance_work_order.line_of_repair

Line of Repair of the Maintenance Organization raising the Maintenance Work Order. E.g first line, second line.

Maintenance_work_order.maintenance_organization

Maintenance Organization raising the Maintenance Work Order

Maintenance_work_order.status

The status of the work order.

Maintenance_work_order.task_type

The type of task that the Maintenance Work Order relates to (i.e. corrective planned, corrective unplanned)

Message

A message provides a package of data to be exchanged.

Message.contract_identification

The contract in support of which the message is being sent.

Message.date_of_extract

The date the data was extracted from the sending system.

Message.date_of_send

The date the message was sent.

Message.message_type

The type of the message.

Message.security_classification

The security classification of information contained within the message.

Message.sent_by

The person who sent the message.

Message.sent_to

The person to whom the message was sent.

Organization

The organization who performed the maintenance activity

Organization.identifier

Identification number of an organization. E.g. CAGE code.

Owning_organization

An organization that owns or owned the reportable item.

Owning_organization.end_date

Date_Time the organization relinquished ownership of the reportable item

Owning_organization.identifier

Identification of the organization owning the reportable item.

Owning_organization.start_date

Date_Time the organization took ownership of the reportable item

Parent_reportable_item

The asset into which the reportable item is fitted.

Person

The person who performed the maintenance activity

Person.identifier

Identification number of a person. E.g. Employee code

Reportable_activity

An activity that has been carried out and is to be reported on.

Reportable_activity.identifier

The identification of the activity being reported

Reportable_activity.reporting_date

The date on which the activity was reported

Reportable_activity.reporting_organization

The organization of the person reporting the activity

Reportable_activity.reporting_person

The person who undertook the activity

Reportable_item

Something tangible.

Reportable_item.description

Description of the reportable item

Reportable_item.NSN

NATO Stock Number of the reportable item

Reportable_item.part_number

Current Part Number of the reportable item

Reportable_item.previous_part_numbers

A set of previous Part Number of the reportable item.

Reportable_item.previous_serial_numbers

A set of previous Serial Numbers of the reportable item.

Reportable_item.serial_number

Current Serial Number of the reportable item

Reportable_item.supplier_code

Current Supplier Code of the reportable item.

NOTE    The supplier code is the code identifying the manufacturer/supplier. Often CAGE code. The manufacturer/supplier "owns" the Part number.

Reportable_item_property

Property measured on a reportable item during a maintenance work order or after asset usage. Typically the properties are Life Measurement Units.

Reportable_item_property.date_time_recorded

Date and time the reportable item property was recorded

Reportable_item_property.measured_by_organization

Organization that measured the property.

Reportable_item_property.name

Name of the reportable item property

Reportable_item_property.unit

The unit of the value.

Reportable_item_property.value

Property value applicable to the reportable at the time of recording

Reportable_item_property.value_increment

The increment by which the property value has been increased

Reportable_item_property.value_type

The type of the value, for example:

• life_meter_reading - the value measured on the meter recording the "life" consumed by the reportable item, where the life value is used to trigger a maintenance task;
• life_cumulative - the cumulative life consumed by the reportable item taking into account the changing of meters;
• measured - the value that has been measured but is not used for calculating life. E.g fuel consumed.

Reportable_item_status_report

A report on a status change to the reportable item, such as an arising.

Reportable_item_usage_report

A report on an activity that has been performed by the reportable item.

Resource

The resource used to perform the maintenance activity

Resource.hours_consumed

Hours recorded against a specific Trade on a Maintenance Work Order

Resource.trade

Trade who consumed hours on a Maintenance Work Order

Resource_part

A resource part is a non reportable item that has been used during a maintenance activity. It may be a spare or consumable part.

Resource_part.description

Description of the resource part

Resource_part.NSN

NATO Stock Number of the reportable item

Resource_part.part_number

No description

Resource_part.serial_number

Current Serial Number of the resource part

Resource_part.supplier_code

Current Supplier Code of the resource part.

NOTE    The supplier code is the code identifying the manufacturer/supplier. Often CAGE code. The manufacturer/supplier "owns" the Part number.

Servicability_status

A state that indicates the condition a reportable item is in. If something is unserviceable it means that there is one or more outstanding maintenance activity and so must not be used at this time for its intended purpose.

Servicability_status.asset

The reportable item the Serviceability Status applies to

Servicability_status.organization

The Owning Organization of the Asset when the Serviceability status started.

Servicability_status.status

The serviceability status of the reportable item. For example: serviceable, unserviceable, scrapped.

Servicability_status.validity_end_date

The Date the Serviceability Status is valid until

Servicability_status.validity_start_date

The Date the Serviceability Status is valid from.

Standard_maintenance_task

A standard maintenance task is a task that is defined by a maintenance procedure.

Standard_maintenance_task.description

Brief textual description of the Standard Maintenance Task

Standard_maintenance_task.identifier

A code identifying the Standard Maintenance Task

Symptom

An observation of asset behaviour that was unexpected and affected the operation of the asset.

NOTE    Often the aircrew findings

Symptom.effect_on_usage

The Effect on Operation the recorded Symptom had on the Phase of operation (e.g. sortie)

Symptom.flight_safetey_hazard

The perceived effect on flight safety by the aircrew when reporting the fault.

Symptom.sortie_phase

Reported Phase of operation e.g. sortie, during which the reported Symptom occurred.

Symptom.system_code

The system on which the symptom was manifested.

Symptom.whenhow_code

Code representing "When/How" the symptom was discovered

Symptom.whenhow_source

Code representing who discovered the symptom

Symptom_report

This activity reports when a symptom is flagged against a reportable item

Task_execution_trigger

The trigger that causes a task to be performed. Normally a date or when a life measurement value reaches a certain limit. For example, when an aircraft has flown so many sorties.

Task_execution_trigger.name

The name of the life property

Task_execution_trigger.unit

The unit of the life property

Task_execution_trigger.value

The value of the life property

Task_extension

A Standard maintenance task extension is an authorized extension to when the task is scheduled to be performed. The task extension is measured in terms of the Life measurement unit or time that is a trigger for the maintenance task to take place.

Task_extension.extended_percentage_of_interval

The percentage of the normal interval of a Standard Maintenance Task that an Extension equates to

Task_extension.extended_value

The value, in terms of the Life Measurement Unit or time, that a trigger for the Standard Maintenance Task is extended to.

Task_extension.max_remaining_extension

The maximum permissible extension allowed for a Standard Maintenance Task minus the total percentage extension assigned.

Task_extension.required_percentage_of_interval

The percentage extension that the trigger for the Standard Maintenance Task is required to be extended to.

Task_extension.required_value

The value, in terms of the Life Measuring Unit or time, that the trigger for the Standard Maintenance Task is required to be extended to.

Usage_profile

A record of the activity performed by the asset such as an Aircraft or Engine. E.g. a sortie flown or an engine test.

Usage_profile.end_time

The time the usage ended. For a sortie, it would be the time the aircraft landed.

Usage_profile.landing_location

The landing location of the sortie.

Usage_profile.start_time

The time the usage started. For a sortie, it would be the time the aircraft took off.

Usage_profile.take_off_location

The take off location for the sortie.

Usage_profile.usage_duration

The duration of the sortie

Usage_profile.usage_identification

The unique identifier for the product usage.

Usage_profile.usage_profile_code

A code identifying the type of usage undertaken by the reportable item. E.g. a sortie flown by an aircraft of a specified type and serial number.

Message

The information is exchanged as a set of messages reporting on various activities undertaken performed by the aircraft or to the aircraft. The activities are summarized in Figure 8. For any given activity, a subset of the information detailed in Figure 8 will reported. The exact content of each message will be determined by the business process requiring the exchange. For example, the reporting of a sortie flown by an aircraft may detail the aircraft, the life consumed by the aircraft, the take off and landing location. For some business processes, only the life consumed may be required.

Figure 8 —  UML model representing reportable activities

The information detailed in the UML class diagram in Figure 8 is as follows:

Message

A message provides a package of data to be exchanged.

Message.contract_identification

The contract in support of which the message is being sent.

Message.date_of_extract

The date the data was extracted from the sending system.

Message.date_of_send

The date the message was sent.

Message.message_type

The type of the message.

Message.security_classification

The security classification of information contained within the message.

Message.sent_by

The person who sent the message.

Message.sent_to

The person to whom the message was sent.

Reportable_activity

An activity that has been carried out and is to be reported on.

Reportable_item_usage_report

A report on an activity that has been performed by the reportable item.

Post_usage_feedback

This activity reports on usages of the reportable item, such as sorties flown by an aircraft or engine tests, that result in accrual of life measurement values.

Reportable_item_status_report

A report on a status change to the reportable item, such as an arising.

Fault_report

This activity reports when a fault is identified on a reportable item.

Geographical_change

This activity reports when a reportable item changes location. E.g. an asset is still owned by the Air Force but changes geographical location.

Servicability_change

This activity reports when the serviceability status of the reportable item changes for any reason. Either a serviceable reportable item becomes unserviceable, or an unserviceable reportable item becomes serviceable.

Symptom_report

This activity reports when a symptom is flagged against a reportable item

Maintenance_activity

A maintenance activity that has been carried out on a reportable item and is to be reported on.

Controlled_exchange

This activity reports when there is any removal of a serviceable reportable item from one aircraft for installation on another aircraft.

Installation

This activity reports when a reportable item is installed on an aircraft or component.

Lifing_extensions

This activity reports when the life measurement limits of a component are extended or a concession to exceed the usage limits or limits to periodic maintenance task are granted. The activity reports the new date at which the deferred tasks are due.

Maintenance

This activity reports when any maintenance activity, either scheduled or unscheduled is performed on a reportable item. The activity may result in the accrual of life measurement values.

Part_number_type_serial_number_change

This activity reports when the Part Number, National/NATO Stock Number, and/or Serial Number of a reportable item are changed as a result of a manufacturers work order or other directive.

Removal_for_access

This activity reports when a serviceable reportable item is removed from an aircraft or component for access and the reportable item is then reinstalled.

Repair_overhaul

This activity reports when a serviceable or unserviceable reportable item is removed from an aircraft or component for repair, overhaul, or rebuild.

Inventory_activity

An activity that affects the inventory.

Inventory_gain

This activity reports when a reportable item is first placed in the aircraft operator’s inventory. This includes installed or uninstalled items. For example, when the reportable item is received from the supplier by the operator.

Inventory_loss

This activity reports when a reportable item is removed from the operator’s inventory. For example, when the reportable item has been decommissioned or transferred to another operator.

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