PIREP-MIREP Monthly Rate Report-System ATA

This report displays information on discrepancies with reference to System ATAs in a reliability fleet. Comprehensive details as well as the month-wise rate of discrepancies (both PIREP and MIREP) for each System ATA are available in the report.

The months for which information is displayed 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 two worksheets

• Graphical representation

• Data summary

Graphical Representation

This worksheet presents individual graphs display month-wise discrepancy rate,  three-month discrepancy rate and pre-defined Alert value for each System ATA in the specified fleet.

Data Summary

This  worksheetdisplays month-wise discrepancy details of all System ATAs of a selected fleet. The report also displays the three-month rate, six-month rate and twelve-month rate of  discrepancies for each System ATA.

A brief description of the column in the report follows

The user can record the following information.

Prerequisites

• Occurrence reports must be processed for discrepancies in the Discrepancy Processing component.

• 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.

Discrepancy Count and Rate Computation

The  PIRP-MIREP Report-System ATA displays information on the number of discrepancies of type  and the rate of discrepancies per 1000 FH on a month-wise basis for each System ATA for a reliability fleet.

For creating this report, the system retrieves discrepancies reported against all ATAs mapped to the System ATA, from Discrepancy Processing component. Additionally, the discrepancies must also satisfy the following conditions for inclusion in the report,

• The discrepancy must be reported in the month.

• The record status must not be “Fresh, “No Fault Found” or “Cancelled”.

• The discrepancy applicability must be “Aircraft”.

• The ATA of the discrepancies must be set to “Yes” for analysis in the Set ATA Reporting Levels page of the Setup Reliability Fleet activity.

• The Reliability Analysis attribute must be set to “Include” for the discrepancy #, in the Analyze Discrepancy/MR Details” activity.

Note: A discrepancy is not considered for reporting, if it  does not possess an ATA #.

The system computes the discrepancy rate at the reliability fleet level for a System ATA. To ascertain the discrepancy rate, the system takes into account, all the  discrepancies reported against a System ATA for all the aircraft attached to a fleet for a specific month. 

Monthly Discrepancy Rate,

(Total number of  discrepancies for all the aircraft in the fleet / Total number of FH for all the aircraft in the fleet) * 1000 FH

The factor of 1000 FH or 100 FH is predefined by the Rate Calculation Factor for FH/FC attribute in the Set Options activity.

For example, a reliability fleet, Boeing-737 comprises 10 aircraft.  And a total of 600 FH was recorded against all the aircraft for the month of March 2007. The System ATA  23 reported 02  discrepancies for all the aircraft in the same month. Assuming the status of discrepancies is not Fresh, No Fault Found and Cancelled, the rate of discrepancy for the System ATA 23 for March, 07 would be,

 (02/600)* 1000= 3.33. 

The computation of other rates of discrepancy is illustrated using the following example,

For example, the System ATA, 21 has the following discrepancy rates for the period between April, 2006 to March, 2007 - 1.2, 1.3, 2.0, 2.1, 1.5, 1.4, 1.6, 1.7, 1.1, 1.2, 1.3 and  2.0.

The three-month rate for the month of March 2007,

Average of rates of January 2007 to March, 2007, i.e. (1.2+1.3+2.0)/3= 1.5.

The six-month rate for the month of March  2007,

Average of rates of October 2006 to March, 2007,  i.e. (1.6+1.7+1.1+1.2+1.3+2.0)/6 = 1.48

The twelve-month rate for the month of March 2007,

Average of rates of April, 2006 to March, 2007, i.e. (1.2+1.3+2.0+1.5+1.4+1.6+1.7+1.1+1.2+1.3+2.0)/12 = 1.53

Note: Both, PIREP and MIREP type of discrepancies are considered for reporting.