Chapter 18 Reliability Reliability Reliability equals consistency Probability

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Chapter 18 Reliability

Chapter 18 Reliability

Reliability • Reliability equals consistency • Probability an item performs a required function •

Reliability • Reliability equals consistency • Probability an item performs a required function • • • Under specific conditions Specified amount of time According to intended design • Detect and resolve problems

Reliability • Two approaches • Whole airline operation • Dispatch reliability • • Delays

Reliability • Two approaches • Whole airline operation • Dispatch reliability • • Delays • • • Achieve on-time departures Maintenance Flight operations ATC Overlook maintenance that do not cause delays Do not track/investigate • Maintenance operation (M&E) • According to intended design

Reliability • Two approaches • Maintenance operation • Address problems of maintenance • •

Reliability • Two approaches • Maintenance operation • Address problems of maintenance • • Whether or not delays or caused Provide analysis/corrective actions

Reliability • Types • Statistical reliability • Collection/analysis of data (events) • • •

Reliability • Types • Statistical reliability • Collection/analysis of data (events) • • • Failure, removal, repair rates Events per 1000 flight hours/per 100 flight cycles Not always appropriate • • Not enough data points Valid approach (p. 219)

Reliability • Types • Historical reliability • • Comparison of current event rates to

Reliability • Types • Historical reliability • • Comparison of current event rates to past event rates Not always appropriate • • New equipment introduced Can be used to establish statistical program

Reliability • Types • Event-oriented reliability • One-time events (not on daily basis) •

Reliability • Types • Event-oriented reliability • One-time events (not on daily basis) • • • Bird strikes In-flight engine shutdowns Lightning strikes Accidents/incidents ETOPS (probably in statistical/historical also)

Reliability • Types • Dispatch reliability • Measure of overall effectiveness • • In

Reliability • Types • Dispatch reliability • Measure of overall effectiveness • • In relation to on-time departures Based on 100 flights (percentage) Should look at whole operation Airlines may not track problems not causing delays • • Airline procedures may need adjusting Page 221/222

Reliability • Rules/practices to manage/control maintenance program • Monitor performance • • • Vehicles

Reliability • Rules/practices to manage/control maintenance program • Monitor performance • • • Vehicles Equipment Call attention for needed corrective action Monitor effectiveness of corrective actions Justify adjusting maintenance program

Reliability • Elements of program • • Data collection Problem area alerting Data display

Reliability • Elements of program • • Data collection Problem area alerting Data display Data analysis Corrective actions Follow-up analysis Monthly report

Data Collection • Elements of program • • • Flight time/cycles per aircraft Cancellations/delays

Data Collection • Elements of program • • • Flight time/cycles per aircraft Cancellations/delays over 15 minutes Unscheduled component removals Unscheduled engine removals In-flight engine shutdowns Pilot reports/logbook write-ups Cabin logbook write-ups Component failures Maintenance check package findings Critical failures

Problem Detection • Alerting system • Performance significantly different from normal • Need to

Problem Detection • Alerting system • Performance significantly different from normal • Need to understand equipment • Know failure patterns • Setting alert levels • • • Set to useable level Indicate problem exists or may be developing Know when to proceed or refrain from investigating • Alert levels recalculated yearly

Data Display • Tabular or graph data • Tabular • Compare event rates with

Data Display • Tabular or graph data • Tabular • Compare event rates with other data • Graph • • View month to month performance Show increasing/decreasing rates

Data Analysis • Preliminary Analysis • Item goes on alert status • • Determine

Data Analysis • Preliminary Analysis • Item goes on alert status • • Determine if alert is valid Sent to engineering for detailed analysis • • • Troubleshoot Determine required action Issue EO

Corrective Action • Results • Modification of equipment • Change/correct line, hangar, shop processes/practices

Corrective Action • Results • Modification of equipment • Change/correct line, hangar, shop processes/practices • Disposal of defective parts • Training of mechanics • Addition of maintenance tasks to program • Decrease in maintenance intervals • Corrective action to be completed within 1 month of EO issue

Follow-up Analysis • Action • Verify corrective action effective • No improvement – back

Follow-up Analysis • Action • Verify corrective action effective • No improvement – back on alert status • Data analysis repeated

Data Reporting • Monthly report • What problems are encountered • What is being

Data Reporting • Monthly report • What problems are encountered • What is being done • Concentrate on items • • Just gone on alert Under investigation Completed corrective actions Progress on other items

Additional Functions • Provide changes to program • • Specific tasks Adjustments in intervals

Additional Functions • Provide changes to program • • Specific tasks Adjustments in intervals to tasks Processes Works with MPRB

MPRB • Meets monthly - discuss • • • Overall status of maintenance reliability

MPRB • Meets monthly - discuss • • • Overall status of maintenance reliability Items on alert Establishment of alert levels Adjustment of the alert levels Works with MPRB