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Cost based risk analysis to identify inspection and restoration intervals of hidden failures subject to aging
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
2011 (English)In: IEEE Transactions on Reliability, ISSN 0018-9529, E-ISSN 1558-1721, Vol. 60, no 1, 197-209 p.Article in journal (Refereed) Published
Abstract [en]

The analytical model presented in this paper aims to study possible maintenance strategies considering risk constrains, to preserve or assure availability of hidden functions of a repairable unit in aircraft systems considering ageing effect. The paper discusses two known strategies for hidden failure management aviation and other high risk industries, namely Failure Finding Inspection (FFI), and a combination of a series of FFI and restoration after a specific number of FFI cycles ( i.e., FFI-Rs strategy). Based on discussions, the paper introduces a new approach named Dynamic Failure Finding Inspection strategy (DFFI) to assure the acceptable level of risk and also the unit's hidden function availability continuously . The paper presents analytical methods to estimate optimal FFI, and optimal thresholds for restoration of degradation (refreshing risk level) within FFI-Rs strategy. It also discusses criteria used to select appropriate thresholds to change the FFI intervals within DFFI strategy, i.e. reducing inspection intervals after specific thresholds, to reduce the risk. The method is based on the mean proportion of time i.e. (Mean Functional Dead Time, MFDT) that the unit is not functioning during the inspection intervals and the average unavailability behavior within the restoration/discard period. The proposed method considers inspection, repair, and restoration times, and takes in to account costs associated with inspection, repair, restoration, potential losses due to non-availability of aircraft due to maintenance downtime or accident often caused multiple failures.

Place, publisher, year, edition, pages
2011. Vol. 60, no 1, 197-209 p.
Research subject
Operation and Maintenance
URN: urn:nbn:se:ltu:diva-14706DOI: 10.1109/TR.2011.2104530Local ID: e20e1c70-9f71-11de-8293-000ea68e967bOAI: diva2:987679
Validerad; 2011; 20090912 (aliahm)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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Ahmadi, AlirezaKumar, Uday
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