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This report helps to analyze the operational reliability of a reliability fleet.
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 one work sheet.
Consolidated information for the entire fleet including fleet size, operating fleet size, flight hours, flight cycles, monthly utilization, operational interruptions, In-flight shutdowns and dispatch reliability rate is available for the month of the report.
Note: In the report, Flight Cycles in column names is substituted by Parameter Description of the Parameter Flying Hours mapped to Base Parameter FH in the Set Base Parameters activity of Aircraft.
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Total Fleet Size |
The total number of aircraft mapped to the reliability fleet. |
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Operating Fleet Size |
The number of aircraft mapped to the reliability fleet with reported flight hours more than Zero hours. |
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Total Flight Hours |
The sum of flight hours of all aircraft in the fleet for the month. |
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Total Flight Cycles |
The sum of flight cycles of all aircraft in the fleet for the month. |
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Total Flight Cycles / Day |
The ratio of Total Flight Cycles to the number of calendar days of the month. |
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Total Fleet Flight Hours/Day/Aircraft |
Total Flight Hours / (Number of calendar days of the month * Total Fleet Size) |
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Operating Fleet Flight Hours/Day/Aircraft |
Total Flight Hours / (Number of calendar days of the month * Operating Fleet Size) |
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Total Fleet Flight Cycles/Day/Aircraft |
Total Flight Cycles / (Number of calendar days of the month * Total Fleet Size) |
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Operating Fleet Flight Cycles/Day/Aircraft |
Total Flight Cycles / (Number of calendar days of the month * Operating Fleet Size) |
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Cycle Time (Flight Hours) |
The ratio of Total Flight Hours to Total Flight Cycles. Note: The Cycle Time column is shown or hidden depending on the value of the parameter “Display Cycle Time?” in the Set Options activity of Reliability Analysis. See Set Options activity Help for more details. |
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Total Revenue Flight Hours |
The sum of flight hours of all aircraft mapped to the fleet with the Fight Ops Type as “Regular”. |
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Total Revenue Departures |
The sum of departures of all aircraft mapped to the fleet with the Fight Ops Type as “Regular”. |
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Aircraft Daily Utilization (Hours) |
The ratio of Total Flight Hours of the reliability fleet to the number of In Service days of the reliability fleet for the month. |
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Aircraft Daily Utilization (Cycles) |
The ratio of Total Flight Cycles of the reliability fleet to the number of In Service days of the reliability fleet for the month. |
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Flight Cancellations for Technical Reasons |
The number of flight cancellations of all aircraft attached to the flight, as a result of technical reasons in the month. |
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Technical Cancellation Rate (Per <100> Revenue take offs) |
The ratio of Flight Cancellations due to Technical Reasons to Total Revenue Departures, which is equal to the following, (Flight Cancellations for Technical Reasons / Total Revenue Departures) * 100 |
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Total Delays > Reportable Delay for Technical Reasons |
The total number of delays caused by technical reasons, reported against all aircraft attached to the fleet. |
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Technical Delay Rate (Per <100> Revenue Take Offs) |
The ratio of Total Delays > Reportable Delay for Technical Reasons to Total Revenue Departures, which is equal to the following, (Total Delays > Reportable Delay for Technical Reasons / Total Revenue Departures) * 100 |
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In Flight Shut Downs |
The number of In Flight Shut Downs reported against all aircraft attached to the fleet. |
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Air Turn Backs / Flight Diversions |
The number of air turn backs and diversions reported against all aircraft attached to the fleet. |
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Ground Turn Backs |
The number of ground turn backs reported against all aircraft attached to the fleet. |
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Technical Dispatch Reliability |
The ratio of total number of flight interruptions to the Total Revenue Departures. |
The above-mentioned information is available for,
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Twelve Months Average |
The running average for the past 12 months. For example, the 12 month running average for February 2008 will include the data recorded for the months starting March 2007 to February 2008. |
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Three Months Average |
The running average for the past three months. For example, the three month running average for February 2008 will include the data recorded for the months starting December 2007 to February 2008. |
Aircraft must be mapped to the reliability fleet in the “Associate Aircraft to Fleet” of the Set up Reliability Fleet activity. And the effective period of the mapping of the aircraft to the fleet must span the reporting month.
Interruption codes must be created in the Create Flight Delay Codes activity of the Common Masters component.
The journey logs must be approved in the Flight Log component.
Technical Dispatch reliability computation
This report takes into account Operational interruptions, such as Delays, Cancellations, Substitutions, Ground Turn backs, Air Turn Backs and Diversions with the Delay Category specified as “Technical & A/C equipment”. The Flight Status recorded in the journey log indicates the kind of interruption faced by the aircraft during the flight.
The ATA of the interruption must be flagged for reliability reporting in the “Set ATA Reporting Levels” page of the Setup Reliability Fleet activity.
The reason # of the operational interruptions which are defined as Delay # in “Create Flight Delay Codes” activity of common masters business component should be considered for reliability Analysis.
The technical dispatch reliability is computed in the following way,
(Total number of operational interruptions due to technical reasons / Total Revenue departures) * 100
In service days refer to the number of unique days on which journey logs are created for an aircraft with “Flight Ops. Type” as “Regular”. Multiple journey logs created for an aircraft on the same day will be considered as a single In service day.
The Fleet Operational Statistics report shows the number of In service days for an active aircraft for each month in the specified period as well as sum of In service days for all the active aircraft in the fleet.