System Item Properties

When an item is selected in the system hierarchy, you can view and edit this information on the Properties tab in the Analysis panel. The following fields may appear.

Note: The fields that are enabled in the Properties tab will depend on the settings that have been defined for the database. You can choose Systems > Tools > Configurable Options to open the Configurable Options for Systems and Powerplant Analysis window and change the settings for the current database.

  • General
    • ATA #: The item number. For systems and subsystems, this is the ATA-assigned number and cannot be changed from the Properties tab. For sub-subsystems, the number must begin with the same number as the subsystem (e.g., if the subsystem's number is 10, you can define sub-subsystems with any or all of the following numbers: 11, 12, 13, 14, 15, 16, 17, 18 or 19). For parts, the only limitation is that the numbers must be between 1 and 9999 and they must be unique for all the parts that are associated with the same item.
    • Item Description: The name and/or description of the system or part.
    • Part Number: The part number of the item.
  • Life Limit Info
    • These fields refer to the maximum possible time interval during which the part may be used on the aircraft. This information will be displayed in the "Component Data" section of the Dassault template for MSI reports. It is not displayed in the Standard or Sukhoi templates.
      • For Type:
        • Select Fixed (Numerical) if you want the interval to be recorded as a number with an associated unit (e.g., 2,000 flight hours can be stored as value=2000 and unit = FHr).
        • Select Based on Events (Text) if you want the interval to be stored in a text field, which can contain any combination of letters or numbers (e.g., “Per Mfr Recommendation”).
      • For Life Limit:
        • If you choose to enter a number, the field will be split into two sections so you can enter the time and then select the units from the drop-down list.
        • If you choose to store the interval as text, you can type up to 100 characters into the field.

Tip: The options in the units drop-down list are set via the Unit Settings window (choose File > Manage Database > Unit Settings).

  • Reference Inputs

The following fields are used in all three report templates for aircraft systems and powerplant analysis (Standard, Dassault and Sukhoi):

    • Zone: Which aircraft zone the item belongs to. While you can use the same numbers as used in the zonal analysis, this is not required.
    • Access: The type of access that is required in order to perform inspections on the item.
    • The Qty Per Aircraft field refers to the total quantity of this item within the entire aircraft, while the Qty Per Unit field refers to the quantity in a single assembly. For example, if there are six turbine engine sections per engine and the aircraft has four engines, the quantity per unit is 6 and the quantity per aircraft is 24. Only the Qty Per Aircraft is displayed in the aircraft systems and powerplant analysis reports.
    • When applicable, you can use the Similar To field to record information about a similar item that is operated in a similar environment and was used as a baseline to design this item.
    • Use the Supplier field to record information about the manufacturer or distributor of the component.
    • When applicable, you can record the:
      • Historical MTBF and Predicted MTBF - mean time before/between failure.
      • Historical MTBUR and Predicted MTBUR  - mean time between unscheduled removal.

You can configure the database to require time units for these values, if desired. (See Configurable Options for Systems and Powerplant Analysis.)

    • When applicable, you can use the MMEL to indicate if the item is included in the Master Minimum Equipment List, which is a categorized list of items that may be inoperative for flight while still maintaining an acceptable level of safety.
    • Any information that you enter in the Remarks field will be displayed in the "MSI Selection Questions" section of the systems and powerplant analysis report.

This field is used only in the Standard report template:

    • Reference: Any additional information that is relevant to the maintainability and reliability data that has been entered (e.g., information about how the results were obtained).

The following fields are used only in the Dassault report template:

    • Functional Index: Any information on the component.
    • Redundancies: Any additional information on the equipment that is used to provide a standard/backup function.
    • Experience: Any additional information based on previous experiences (e.g., other aircraft parts).

  • The Working Group Info area displays information about the most recent working group that performed analysis for the current hierarchy item. It is updated automatically when you add an item or change an item property, and is based on the current working group session stamp. If desired, you can also update it manually (e.g., to force all of the items to show the latest working group information before you generate a report). Click the Edit icon, , to open the Current Item Working Group Stamp window.

  • The History fields display information about when the item was created and last modified. These details are recorded automatically by the application. If the history log has been activated at the project level, you can click the View Item History icon to open the Record History Log for the item.

Related Topics and Links