DEX: (D011) aviation_maintenance — Aviation maintenance

Date: 2009/06/17 17:10:29
Revision: 1.154

Cover Contents Abstract Introduction Terms Scope PLCS Activity Model Business Overview Information Overview Information Requirements PLCS Representation Capabilities Templates Schemas Reference Data Conformance Bibliography

Information Requirements

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 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_Product_In_Focus

The end item to which the Product In Focus 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 Technical Instructions 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 re-investigated.

Fault_status.deferred_to_metric

The life metric at which the deferred fault is to be re-investigated. 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. For example:

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 Product In Focus has been installed on.

Installation_history.end_asset_installation_date: Date_Time a Product In Focus was fitted to an End Asset
Installation_history.end_asset_removal_date: Date_Time a Product In Focus was removed from an End Asset
Installation_history.installation_date: Date_Time a Product In Focus is installed into a Parent Asset
Installation_history.removal_date: Date_Time a Product In Focus 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 Product In Focus.

Location_history.end_location_date: Date_Time when Product In Focus is no longer held at the Organization or Physical Location
Location_history.organization_location: Organization location of the Product In Focus
Location_history.physical_location: The geographical location of the Product In Focus. E.g. RAF Wyton.
Location_history.start_location_date: Time the Change of Location of the Product In Focus is effective from
Location_history.status_at_exchange: Serviceability Status of the Product In Focus at the time of a Change of Location

Maintenance_activity

A maintenance activity that has been carried out on a Product In Focus 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 Product In Focus.

Owning_organization.end_date: Date_Time the organization relinquished ownership of the Product In Focus
Owning_organization.identifier: Identification of the organization owning the Product In Focus.
Owning_organization.start_date: Date_Time the organization took ownership of the Product In Focus

Parent_Product_In_Focus

The asset into which the Product In Focus 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

Product_In_Focus

Something tangible.

Product_In_Focus.description: Description of the Product In Focus
Product_In_Focus.NSN: NATO Stock Code / Stock Number of the Product In Focus
Product_In_Focus.part_number: Current Part Number of the Product In Focus
Product_In_Focus.previous_part_numbers: A set of previous Part Number of the Product In Focus.
Product_In_Focus.previous_serial_numbers: A set of previous Serial Numbers of the Product In Focus.
Product_In_Focus.serial_number: Current Serial Number of the Product In Focus
Product_In_Focus.supplier_code: Current Supplier Code of the Product In Focus.
NOTE The supplier code is the code identifying the manufacturer/supplier. Often CAGE code. The manufacturer/supplier "owns" the Part number.

Product_In_Focus_property

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

Product_In_Focus_property.date_time_recorded

Date and time the Product In Focus property was recorded

Product_In_Focus_property.measured_by_organization

Organization that measured the property.

Product_In_Focus_property.name

Name of the Product In Focus property

Product_In_Focus_property.unit

The unit of the value.

Product_In_Focus_property.value

Property value applicable to the Product In Focus at the time of recording

Product_In_Focus_property.value_increment

The increment by which the property value has been increased

Product_In_Focus_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 Product In Focus, where the life value is used to trigger a maintenance task;
life_cumulative - the cumulative life consumed by the Product In Focus 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.

Product_In_Focus_status_report

A report on a status change to the Product In Focus, such as an arising.

Product_In_Focus_usage_report

A report on an activity that has been performed by the Product In Focus.

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 Product In Focus part 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 Code / Stock Number of the Product In Focus
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 Product In Focus 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 Product In Focus that 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 Product In Focus. 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 Product In Focus

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 Product In Focus. E.g. a sortie flown by an aircraft of a specified type and serial number.

Message

When information is to be exchanged between maintenance IT systems, it 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.

Product_In_Focus_usage_report

A report on an activity that has been performed by the Product In Focus.

Post_usage_feedback

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

Product_In_Focus_status_report

A report on a status change to the Product In Focus, such as an arising.

Fault_report

This activity reports when a fault is identified on a Product In Focus.

Geographical_change

This activity reports when a Product In Focus 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 Product In Focus changes for any reason. Either a serviceable Product In Focus becomes unserviceable, or an unserviceable Product In Focus becomes serviceable.

Symptom_report

This activity reports when a symptom is flagged against a Product In Focus.

Maintenance_activity

A maintenance activity that has been carried out on a Product In Focus and is to be reported on.

Controlled_exchange

This activity reports when there is any removal of a serviceable Product In Focus from one aircraft for installation on another aircraft. This activity is usual referred to as Ac Robbing Certificate (RAF Form 7213-a).

Installation

This activity reports when a Product In Focus 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 Product In Focus. 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 Code / Stock Number, and/or Serial Number of a Product In Focus are changed as a result of a manufacturers work order or other directive.

Removal_for_access

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

Repair_overhaul

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

Inventory_loss

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