Deferrals & Operational Interruptions Analysis Report

This report displays the information on the discrepancy deferrals and the operational interruptions due to technical reasons, reported against a reliability fleet.

The month-wise count of deferrals of deferral types MEL and Acceptable Deferred Defects (ADD), technical delays, technical cancellations and technical substitutions recorded against each aircraft of a reliability fleet is 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 work sheets:

Graphs

This worksheet displays individual graphs that depict the following information,

Deferrals and Operational Interruptions report

This worksheet displays the breakup of the following information for the month-wise basis for all aircraft in the reliability fleet. The months for which information is represented in the graph. This is based on the “Analysis Period “ defined 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.

Monthly Average daily open Acceptable Deferred Defects	The average count of open Acceptable Deferred Defects pertinent to aircraft of the reliability fleet for the month of the report. The Acceptable Deferred Defects of the Deferral Type selected in the Set Options activity.
MEL	The average count of open Acceptable Deferred Defects of Deferral Type “MEL” pertinent to aircraft of the reliability fleet, for the month.
Six months running Average of daily open ADDs	The six months running average of open Acceptable Deferred Defects of Deferral Type “MEL” for six months preceding and including the month.
Monthly Total Number of Cancellations for Technical Reasons	The count of cancellations of aircraft classified under the Delay Category “Technical & A/C Equipment”, for the month.
Monthly Total Number of Aircraft Substitutions for Technical Reasons	The count of substitutions of aircraft classified under the Delay Category “Technical & A/C Equipment”, for the month.
Monthly Total Number of Technical Delays	The count of cancellations of aircraft classified under the Delay Category “Technical & A/C Equipment”, for the month of the report.
Monthly Rate of Technical Delays	The rate of technical delays for the month.
Six months Running Average of the monthly Rate of Technical Delays	The six months running average of technical delays for the month.
Six Months Running Average of the Monthly Average of daily open MELs	The six months running average of open MELs, including the current month, for all aircrafts in the reliability fleet.

Average number of daily Open ADD

This graph depicts the month-wise count and the six months running average of daily open ADD for all the aircraft in the reliability fleet.

Note: Only the Deferral Types (CDL, DMI and Others) flagged as ‘Required’ for reliability analysis in the ‘Set Options’ activity are considered for reporting of ADD.

X-Axis

Months

Y-Axis

§ ADD:

The count of ADD reported per day per aircraft in the reliability fleet. This value is derived using the formula,

(Count of ADD for aircraft in the fleet) / ((Count of aircraft in the fleet) * Count of Service days))

§ Six months running average of ADD

Six month running average of Open ADD at the end of the month, including the reported month.

Count of aircraft in the fleet: This is the number of aircraft mapped to the reliability fleet at the end of the reported month.

Note: The status of the aircraft and the reliability fleet must be ”Active”.

Count of Service days: This is the sum of unique service days for each aircraft in the reliability fleet. (‘Service Days’ of an aircraft is the unique count of days on which journey logs are raised with the ‘Flight Ops. Type’ attribute as ‘Regular’. If on a day, more than one journey log are available for an aircraft, with the ‘Flight Ops. Type’ attribute as ‘Regular’, then the count would be taken as “1”).

Example,

Aircraft in Fleet 1	Count of Unique Service Days for April, 2008
Aircraft reg 1	28
Aircraft reg 2	29
Aircraft reg 3	29
Total Count of Unique Service Days for Fleet 1	86

Average Number of daily open MELs

This graph depicts the month-wise average number of daily open MEL’s and the six months running average of MELs for all aircraft in the reliability fleet.

X-Axis

Months

Y-Axis

§ MEL:

The count of MEL’s reported per day per aircraft in the reliability fleet. This value is derived using the formula,

(Count of MEL for aircraft in the fleet) / ((Count of aircraft in the fleet) * Count of Service days))

§ Six months running average of MEL

Six month running average of MEL at the end of the month, including the reported month.

Monthly rate of cancellations and substitutions due to technical reasons – per FC

This graph depicts the month-wise rate of cancellations and substitutions of all aircraft in the fleet, caused by technical snags per FC.

X-Axis

Months

Y-Axis

§ Month-wise rate of Technical Cancellations for the reliability fleet.

§ Month-wise rate of Technical Substitutions for the reliability fleet.

Note: The rate calculation factor would depend on the value specified for the Rate Calculation Factor for “FH/FC” attribute in the Set Options activity.

Rate of technical cancellations is computed using the following formula,

(Number of technical cancellations per month for the fleet / Total number of FH per month for the Fleet) * 1000 or 100 FC

Rate of technical substitutions is computed using the following formula,

(Number of technical substitutions per month for the fleet / Total number of FH per month for the Fleet) * 1000 or 100 FC

Technical cancellation count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status as “Cancelled”
Flight Status as “Delayed’, with delay duration over the Delay Limit specified in the Setup Reliability Fleet activity.
Reason # of the cancellation / Delay # of the delay is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Note: If the Delay Limit is not specified in the Setup Reliability Fleet activity, regardless of the delay duration it would be considered as ‘Delayed’.

Technical substitution count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status is “Substituted”
Reason # of the cancellation is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Monthly rate of cancellations and substitutions due to technical reasons – per FH

This graph depicts the month-wise rate of cancellations and substitutions of all aircraft in the fleet, caused by technical snags per FH.

X-Axis

Months

Y-Axis

§ Monthly rate of Technical Cancellations for the reliability fleet.

§ Monthly rate of Technical Substitutions for the reliability fleet.

Note: The rate calculation factor would depend on the value specified for the Rate Calculation Factor for “FH/FC” attribute in the Set Options activity.

Rate of technical cancellations is computed using the following formula,

(Number of technical cancellations per month for the fleet / Total number of FH per month for the Fleet) * 1000 or 100 FH

Rate of technical substitutions is computed using the following formula,

(Number of technical substitutions per month for the fleet / Total number of FH per month for the Fleet) * 1000 or 100 FH

Technical cancellation count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status as “Cancelled”
Flight Status as “Delayed’, with delay duration over the Delay Limit specified in the Setup Reliability Fleet activity.
Reason # of the cancellation / Delay # of the delay is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Note: If the Delay Limit is not specified in the Setup Reliability Fleet activity, regardless of the delay duration it would be considered as ‘Delayed’.

Technical substitution count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status is “Substituted”
Reason # of the cancellation is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Monthly rate of delays due to technical reasons – per FC

This graph depicts the month-wise rate of delays of all aircraft in the fleet, caused by technical snags per FC.

X-Axis	Months
Y-Axis	Monthly rate of Technical Delays for the reliability fleet per FC

Note: The rate calculation factor would depend on the value specified for the Rate Calculation Factor for “FH/FC” attribute in the Set Options activity.

Rate of technical delays is computed using the following formula,

(Number of technical delays per month for the fleet / Total number of FC per month for the fleet) * 1000 or 100

Technical delay count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status as “Delayed’, with delay duration between the ‘Reportable Delay’ and ‘Delay Limit’ specified in the Setup Reliability Fleet activity.
Delay # of the delay is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Note: If the Delay Limit is not specified in the Setup Reliability Fleet activity, regardless of the delay duration it would be considered as ‘Delayed’.

Monthly rate of delays due to technical reasons – per FH

This graph depicts the month-wise rate of delays of all aircraft in the fleet, caused by technical snags per FH.

X-Axis	Months
Y-Axis	Monthly rate of Technical Delays for the reliability fleet, per FH.

Note: The rate calculation factor would depend on the value specified for the Rate Calculation Factor for “FH/FC” attribute in the Set Options activity.

Rate of technical delays is computed using the following formula,

(Number of technical delays per month for the fleet / Total number of FH per month for the fleet) * 1000 or 100

Technical delay count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status as “Delayed’, with delay duration between the ‘Reportable Delay’ and ‘Delay Limit’ specified in the Setup Reliability Fleet activity.
# of the delay is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Note: If the Delay Limit is not specified in the Setup Reliability Fleet activity, regardless of the delay duration it would be considered as ‘Delayed’.

Monthly rate of cancellations due to technical reasons – per FC

This graph depicts the month-wise rate of cancellations of all aircraft in the reliability fleet, caused by technical snags per FC

X-Axis	Months
Y-Axis	Monthly rate of Technical Cancellations for the reliability fleet, per FC.

Note: The rate calculation factor would depend on the value specified for the Rate Calculation Factor for 'FH/FC' attribute in the Set Options activity.

Rate of technical cancellations is computed using the following formula,

(Number of technical cancellations per month for the fleet / Total number of FC per month for the Fleet) * 1000 or 100

Technical cancellation count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status as “Cancelled”
Flight Status as “Delayed’, with delay duration over the Delay Limit specified in the Setup Reliability Fleet activity.
Reason # of the cancellation / delay # of the delay is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Note: If the Delay Limit is not specified in the Setup Reliability Fleet activity, regardless of the delay duration it would be considered as ‘Delayed”.

Monthly rate of cancellations due to technical reasons – per FH

This graph depicts the month-wise rate of cancellations of all aircraft in the reliability fleet, caused by technical snags per FH.

X-Axis	Months.
Y-Axis	Monthly rate of Technical Cancellations for the reliability fleet, per FH.

Note: The rate calculation factor would depend on the value specified for the Rate Calculation Factor for 'FH/FC' attribute in the Set Options activity.

Rate of technical cancellations is computed using the following formula,

(Number of technical cancellations per month for the fleet / Total number of FH per month for the Fleet) * 1000 or 100

Technical cancellation count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status as “Cancelled”
Flight Status as “Delayed’, with delay duration over the Delay Limit specified in the Setup Reliability Fleet activity.
Reason # of the cancellation / Delay # of the delay is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Note: If the Delay Limit is not specified in the Setup Reliability Fleet activity, regardless of the delay duration it would be considered as ‘Delayed”.

Monthly rate of substitutions due to technical reasons – per FC

This graph depicts the month-wise rate of substitutions of all aircraft in the reliability fleet, caused by technical snags per FC.

X-Axis	Months
Y-Axis	Monthly rate of Technical Substitutions for the reliability fleet, per FC.

Note: The rate calculation factor would depend on the value specified for the Rate Calculation Factor for 'FH/FC' attribute in the Set Options activity.

Rate of technical substitutions is computed using the following formula,

(Number of technical substitutions per month for the fleet / Total number of FC per month for the fleet) * 1000 or 100

Technical substitution count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status is “Substituted”
Reason # for the substitution is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Monthly rate of substitutions due to technical reasons – per FH

This graph depicts the month-wise rate of substitutions of all aircraft in the reliability fleet, caused by technical snags per FH.

X-Axis	Months
Y-Axis	Monthly rate of Technical Substitutions for the reliability fleet, per FH.

Note: The rate calculation factor would depend on the value specified for the Rate Calculation Factor for 'FH/FC' attribute in the Set Options activity.

Rate of technical substitutions is computed using the following formula,

(Number of technical substitutions per month for the fleet / Total number of FH per month for the fleet) * 1000 or 100

Technical substitution count: This is equal to the number of journey log legs for all the aircraft in the reliability fleet that satisfy the following

Journey log Status is “Approved”
The Flight Date must occur in the reported month
Flight Status is “Substituted”
Reason # for the substitution is mapped to the Delay Category “Technical & A/C Equipment” (in the Regularize Delay Record activity in the ‘Flight Log’ business component).

Prerequisites

Discrepancies must be processed in the Discrepancy Processing component.
Discrepancies must be deferred in any of the following components,
Flight Log.
Compliance Tracking & Control and Hangar Work Order.
Discrepancy Processing.
Aircraft must be attached to a reliability fleet in the Reliability Analysis component, in ‘Active’ status.