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This report provides NFF information of parts for a reliability fleet. The unscheduled removals, FH and NFF for part #-serials # attached to all the aircraft in the fleet is available in the report. The same information, consolidated for each System ATA and Major System ATA is depicted using graphs in the report.
The months for which the information is depicted in the graphs is based on the Analysis Period attribute in the Set Options activity. For example, the March 2008 report with the Analysis Period set to ‘12’ would show data beginning April, 2007 to March, 2008.
Report input: You must select the month and year and, the reliability fleet for the report in the Generate Reliability Report page. For further information, see the “Generate Reliability Report” topic.
Report output: This report is an Excel sheet and consists of three worksheets,
Note: All parts for which no NFF information exists in the month of the report are excluded from the report.
See Computation of Unscheduled removals for reporting, Computation of NFF for reporting and Retrieval of FH for reporting for in-depth information.
This worksheet helps to analyze the NFF of serial controlled parts attached to all aircraft in the fleet. The total number of unscheduled removals, FH and NFF for the past 1, 3, 6 and 12 months as well as since inception are available in the report. However, the report excludes parts that have not reported any NFF during the month.
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ATA # |
The ATA of the part. |
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Part # |
The identification number of the part. |
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Serial # |
The serial number of the part. |
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Description |
The short name/description of the part. |
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Past 1 Month |
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Unscheduled Removals |
The number of unscheduled removals during the month of the report. See |
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NFF |
The number of NFF recorded for the part during the month of the report. |
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FH |
The FH of the part during the month of the report. |
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Past 3 Months |
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Unscheduled Removals |
The number of unscheduled removals of the part during three months prior to the date of the report. |
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NFF |
The number of NFF of the part during three months prior to the date of the report. |
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FH |
The FH for the part during three months prior to the date of the report. |
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Past 6 Months |
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Unscheduled Removals |
The number of unscheduled removals of the part during six months prior to the date of the report. |
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NFF |
The number of NFF of the part during six months prior to the date of the report. |
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FH |
The FH for the part during six months prior to the date of the report. |
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Past 12 Months |
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Unscheduled Removals |
The number of unscheduled removals of the part during 12 months prior to the date of the report. |
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NFF |
The number of NFF of the part during 12 months prior to the date of the report. |
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FH |
The FH for the part during 12 months prior to the date of the report. |
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Since New |
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Unscheduled Removals |
The number of unscheduled removals of the part since inception. |
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NFF |
The number of NFF of the part since inception. |
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FH |
The FH for the part since inception. |
This worksheet displays a breakup of NFF on the basis of System ATAs for the reliability fleet. The total number of unscheduled removals, FH and NFF for the past 1,3, 6 and 12 months as well as since inception for each System ATA, is available in the report.
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System ATA # |
The System ATA to which the ATA of the part is mapped. |
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System ATA |
The short name/description identification number of the System ATA. |
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Past 1 Month |
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Unscheduled Removals |
The number of unscheduled removals for the System ATA during the month. |
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NFF |
The number of NFF recorded for the System ATA during the month of the report. |
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NFF % |
The ratio of NFF to the Unscheduled Removals during the month. |
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Past 3 Months |
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Unscheduled Removals |
The number of unscheduled removals for the System ATA during three months prior to the date of the report. |
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NFF |
The number of NFF for the System ATA during three months prior to the date of the report. |
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NFF % |
The ratio of NFF to the Unscheduled Removals during three months prior to the date of the report. |
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Past 6 Months |
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Unscheduled Removals |
The number of unscheduled removals for the System ATA during six months prior to the date of the report. |
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NFF |
The number of NFF shop visits for the System ATA during six months prior to the date of the report. |
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NFF % |
The ratio of NFF to the Unscheduled Removals during six months prior to the date of the report. |
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Past 12 Months |
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Unscheduled Removals |
The number of unscheduled removals for the System ATA during 12 months prior to the date of the report. |
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NFF |
The number of NFF shop visits for the System ATA during 12 months prior to the date of the report. |
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NFF % |
The ratio of NFF to the Unscheduled Removals during 12 months prior to the date of the report. |
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Since New |
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Unscheduled Removals |
The number of unscheduled removals for the System ATA since inception. |
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NFF |
The number of NFF shop visits for the System ATA since inception. |
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NFF % |
The ratio of NFF to the Unscheduled Removals since inception. |
This worksheet displays a breakup of NFF for various Major System ATAs for the reliability fleet. The total number of unscheduled removals, FH and NFF for the past 1, 3, 6 and 12 months as well as since inception for each Major System ATA, is available in the report.
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Major System ATA # |
The Major System ATA to which the ATA of the part is mapped. |
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Major System ATA Description |
The short name/description identification number of the Major System ATA to which the ATA of the part is mapped. |
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Past 1 Month |
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Unscheduled Removals |
The number of unscheduled removals during the month of the report. |
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NFF |
The number of NFF recorded for the Major System ATA during the month of the report. |
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NFF % |
The ratio of NFF to the Unscheduled Removals during the month. |
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Past 3 Months |
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Unscheduled Removals |
The number of unscheduled removals for the Major System ATA during three months prior to the date of the report. |
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NFF |
The number of NFF for the Major System ATA during three months prior to the date of the report. |
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NFF % |
The ratio of NFF to the Unscheduled Removals during three months prior to the date of the report. |
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Past 6 Months |
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Unscheduled Removals |
The number of unscheduled removals for the Major System ATA during six months prior to the date of the report. |
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NFF |
The number of NFF for the Major System ATA during six months prior to the date of the report. |
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NFF % |
The ratio of NFF to the Unscheduled Removals during six months prior to the date of the report. |
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Past 12 Months |
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Unscheduled Removals |
The number of unscheduled removals for the Major System ATA during 12 months prior to the date of the report. |
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NFF |
The number of NFF for the Major System ATA during 12 months prior to the date of the report. |
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NFF % |
The ratio of NFF to the Unscheduled Removals during 12 months prior to the date of the report. |
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Since New |
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Unscheduled Removals |
The number of unscheduled removals for the Major System ATA since inception. |
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NFF |
The number of NFF shop visits for the Major System ATA since inception. |
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NFF % |
The ratio of NFF to the Unscheduled Removals since inception. |
Aircraft must be mapped to the reliability fleet in the “Associate Aircraft to Fleet” page in the of the Set Reliability Fleet activity in the Reliability Analysis component.
System ATAs, Major System ATAs must be created and their attributes defined in the ”Set ATA Reporting Levels” page of the Set Reliability Fleet activity in the Reliability Analysis component.
Computation of Unscheduled removals
The Part NFF Analysis report provides consolidated information on the unscheduled removals that occur in the reported month/months for the entire fleet. However, the unscheduled removals that satisfy the below-explained conditions only are considered for the report.
For components of every aircraft comprising the reliability fleet, the totaling of the unscheduled removals happens as follows,
Components retrieved from the Aircraft Configuration.
Sum of Unscheduled and Basic removals for each component from the Component Replacement with the Reason # that is marked for Reliability Analysis in the “Create Reasons for Removals” activity of the Common Masters component. For non-components of each aircraft in the reliability fleet, the system arrives at the sum of unscheduled removals in the following way,
For non-components of aircraft,
Retrieves the part numbers of non-components from the Spare Part List
The Removal Basis parameter in the Set Options activity forms the basis for the inclusion of unscheduled removals in the report. If this parameter is set to “Component Replacements”, the system counts the unscheduled removals from Hangar work orders, Component work orders and Technical Logs that satisfy the following conditions,
Sum of Unscheduled removals for each part from the Component Replacement with the Reason # identified for Reliability Analysis in the “Create Reasons for Removals” activity in the Common Masters.
The status must be “Pre-closed” or “Closed” for Hangar and Component work orders; “Confirmed” for Technical Logs.
If the Removal Basis parameter is set to “Maintenance Issue”, the number of unscheduled removals will be the sum of the following,
From hangar work order and component work order, the (Issue-Return) quantity of each part for a task or work order with the Planning Type attribute set to “Unplanned”.
From Technical Log, the (Issue-Return) quantity of each part for a material request with the Planning Type attribute set to “Unplanned”.
The NFF information pertaining to all components and non-components of each aircraft in the reliability fleet is retrieved from component work orders and Repair orders, for the report.
From Component work orders, the NFF for a part is counted for the report, if
The “Component Condition Changed to” in the “Record Inspection Findings” is “Serviceable”.
The status of the component work order is “Pre-closed” or “Closed”.
From repair orders, the NFF for a part is counted for the report, if
The “‘Confirm Discrepancies Reported” is “No Fault Found”.
The status of the repair order must be “Acknowledge”, “Amended”, “Authorized”, “BER Closed”, “Quoted”, “Released” and “Shipped”.
The NFF must occur in the reported month/months
The system adds the number of NFF from the component work orders as well as repair orders for a part to ascertain the total number of NFF.
The sum of the FH for each component during the month/months is retrieved from the PV Update, for the report. Likewise for the non-components, the FH will be,
Total FH of the reliability fleet/ Number of aircraft in the reliability fleet during the month.