The traditional method adopted for aircraft maintenance was based on flying hours of the aircraft. In 1974 the United States Department of Defence initiated efforts to analyze techniques to be used by airline industries to develop cost effective maintenance programs. And the result is a radically different approach to aircraft maintenance called 'Reliability Centred Maintenance'.
This new methodology resulted in huge cost savings for the airlines. Not only are these cost savings immense, but they were achieved with no decrease in safety or dispatch reliability. To the contrary, safety and reliability actually improved in almost every instance when emphasis shifted from scheduled retirement-overhaul-replacement to on-condition maintenance.
The OEMs are responsible to determine the TBO of the components or the engine as a part of certification process with the regulator. The TBO is calculated after rigorous testing and analysis of the components. However the modern structural and thermal analysis software’s can predict the life of the components to a great extend. The most widely used statistical technique for reliability prediction is Weibull analysis as it is the best suited method for failure prediction of mechanical components. The well-known "bathtub curve" depicts the failure pattern with a high risk of failure when the item is first placed in service ("infant mortality"), the useful life and followed by a second high-risk “Wear out zone” when the item exceeds its useful life.
The criticality of the failure of a component to probability of failure is studied using Hazard Risk Index (HRI) to determine the safe life of the component. The components are released for this safe life operation if the failure analysis proves that the type of failure is under the safe zone. The TBO is determined by the OEMs based on this analysis.
The maintenance organizations usually calculate the MTBUR of the component to schedule the maintenance activities and to calculate the float levels. But the accuracy of this calculation is largely dependent on the techniques used for data collection. The modern ERP systems provide a framework to collect data required for accurate reliability analysis. For more information on this, please refer the white paper published in box.net accessible through the below link.
This white paper details the the reliability analysis solution developed on top of Oracle’s ERP system (the solution was built on top of eBiz suite application Complex Maintenance Repair and Overhaul).
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ReplyDeleteReliability Centered Maintenance can be used to create a cost-effective maintenance strategy to address dominant causes of equipment failure. It is a systematic approach to defining a routine maintenance program composed of cost-effective tasks that preserve important functions.
RCM Blitz™ founder and facilitator, Doug Plucknette, is the author of Reliability Centered Maintenance using...RCM Blitz™ as well as his latest book Clean, Green and Reliable: The Role of Maintenance in Sustainability.
rcm reliability centered maintenance
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