Potential Solutions on Aircraft Structural Rating System ... - AMMJ

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With the growing maturity in composites research, increasing composites are applied ontoaircrafts. A more specific and rigid rating system for non-metallic according to MSG-3 or evenbeyond MSG-3 (if necessary) must be developed for new aircraft, compared with relativelyobscure rating by Airbus and Boeing .Last but not least, a new rating system for metallic non-metallic material combinations is required,depending on the way of material combination and the resulting exposure to AD and ED whichdiffers from single ratings [18].The above discussion is based on the analysis of MSG-3. It is noticeable that MSG-3 is rather aclose loop concept than an open one. See Figure 1.Feedback of operational experience, rectify measures, modification of maintenance workcardsand periods and amendment of ground rules are part of reliability management, which also belongto the feedback step of MSG-3. Among them, rectify measures are the nodal points connectingoperation experience and maintenance control requirements. Feedback to the first step, check thefunctionality of design, performance criteria etc. Feedback to the second step, modification of SSI;feedback to the third step, update SSI categorization; feedback to the forth step, check if theanalysis is applicable and effective; feedback to the fifth step, update the maintenance intervalsand tasks according to real data. These seven steps comprise a close loop procedure for MSG-3,which is also a close loop for information transition [1]. In other words, the determination ofmaintenance intervals and maintenance tasks is a repeatedly learning procedure which finallytends to be more reasonable.
Task1. Data collection andobjective determinationOutputTechnical datafeedback2. SSI selectionSSI list3. Classify SSI asDamage Tolerant orSafe Life itemSSI data sheet4. AD/ED/CPCP/FDanalysis5. Inspection level andtask determinationMaintenance task sheetand initial maintenancereview board6. Application and assessmentMPD, maintenancepolicy, maintenancemanual, IPC, workcard,spare parts, inventory7. Operation experience feed backFigure 1 Framework and procedure of MSG-3 structural partTherefore, two suggestions are proposed for future work: (1) Research into the mechanism ofstructural deterioration. Intensive experiments should be carried out in order to figure out, forexample, the following questions to a certain structural item: how many failure modes may itoccur, which is the primary mode and how these failure modes interact with each other toinfluence the deterioration, what is the failure distribution against time (flight hours or calendardays/months/years). (2) Pay more attention to the feedback section. Much emphasize should beput on the reliability data collection and maintenance work modification. The lack of amethodology for optimizing intervals in operation phase arises. Thus, supporting tools should bedeveloped for reliability data collection and management. Specifically, one example is thatBayesian analysis can be applied which evaluation is a learning process and knowledge iscontinually updated as more information becomes available. Such issues are of great importancewhen selecting and fitting mathematical models to improve the accuracy and utility of thesedecisions [19]. Another example will be a need to introduce an optimization-based decisionsupport to deal with multi-objective decision-making process [20].5. Conclusion
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Potential Solutions on Aircraft Structural Rating System ... - AMMJ

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