The paper considers the theoretical explanation and construction of some mathematical models of the aircraft operational process in reference to maintenance organizations preferred by aviation experts and aircraft operators. The uncertainty of such operational multi-alternativeness is evaluated on the basis of subjective entropy of preferences demonstrated by aircraft operators and aviation experts. When applying the maximum principle of subjective entropy, the optimal distributions of the preferences are obtained. The proposed concept allows finding the optimal distribution of the aircraft fleet according to the available maintenance alternatives. To optimize the above mentioned distribution, one may take into account the possible development and improvement of maintenance organizations and so called “shadow” components. The paper also discusses a significant approach that helps to evaluate the effectiveness of organizations functioning in the area of aviation. This evaluation can be carried out at both global and continental levels as well as state, operator, and airline levels. The respective modeling has been performed and is illustrated with diagrams.

/pdf/aircraft-operation-depending-upon-the-uncertainty-of-fthxfpmtms.pdf

Aircraft operation depending upon the uncertainty of maintenance alternatives

Purpose – Pakistani aviation industry is at the initial stage of its evolution and is undergoing transformation to a high-tech developed industry. However, the processes and practices in this industry are quite primitive and lack performance-measuring techniques for decision makers. The available literature in the total quality management (TQM) suggests a set of standardized factors for evaluating the performance of any organization. The purpose of this paper is to conduct a research with a view to judge the applicability of these TQM factors for measuring the performance of any aviation manufacturing organization in Pakistan. Design/methodology/approach – This research is focussed on performance evaluation of aviation manufacturing industry of Pakistan through TQM. Eight well-established dimensions of TQM frequently used by renowned researchers were used for an evaluation of the Pakistani Aviation Manufacturing Industry (PAMI), namely top management support, quality information availability, quality info...

An empirical study on measurement of performance through TQM in Pakistani aviation manufacturing industry

The paper considers theoretical explanation and construction of some mathematical models of a transportation mean operational process in reference to maintenance optimal periodicity. The important finding is that the objectively existing engineering transportation means maintenance optimal periodicity is determined in the different from the probabilistic methods way. There is a scientifically proven explanation for the mentioned above periodicity optimization with the help of the specially introduced hybrid-optional effectiveness functions distribution. The developed doctrine uses the entropy paradigm conditional extremization approach. This contribution allows obtaining the wanted optimal periodicities sidestepping the related states probabilities determination and their further extremization. The essential breakthrough of the developed doctrine is that the optional objective effectiveness functions, in such a case, are the corresponding combinations of the intensities of the studied system’s possible transitions from state to state, which relates with the set of the considered operational options. Corresponding limit solutions for the zero-to-zero ratio indeterminate forms are analyzed. Theoretical speculations are illustrated with the example calculation experiments. The necessary diagrams are plotted.

https://www.bjrbe.vgtu.lt/index.php/Aviation/article/download/5930/5172

A multi-optional hybrid functions entropy as a tool for transportation means repair optimal periodicity determination

The paper builds on the ideas of previous research concerning the theoretical explanation of the aircraft operational process with regard to the preferences for maintenance organization by experts and aircraft operators, and describes the designed mathematical models. The problem of conditional extremization is considered. The uncertainty of aircraft technical operation multi-alternativeness is evaluated using the subjective entropy of the aircraft operators’ and experts’ preferences. By applying the subjective entropy extremization principle in view of its maximum, we obtain the conditional optimal distributions of the preferences. The proposed approach allows finding the optimal distribution of the aircraft fleet for the available maintenance alternatives, taking into consideration the restricted possible influences or shadow components of maintenance organizations. The concepts discussed here are important for evaluating the effectiveness of the aviation industry by making allowance for shadow parameters, if needed. The designed model is illustrated with diagrams.

/pdf/development-of-a-theoretical-approach-to-the-conditional-3fmvzvlini.pdf

Development of a theoretical approach to the conditional optimization of aircraft maintenance preference uncertainty

It is a global trend for the airport ground handling market to become liberalised. Fiercer competition lead to the necessity to improve efficiency and minimise costs. A mathematical model of optimal resource allocation by aircraft ground handling company using duality theory has been suggested. The numerical results for the solution of the task under the question which were obtained with the relevant software package, proved validity of the specified theoretical preconditions and allowed to improve the work schedule of the experimental aircraft ground handling company in accordance with a specified efficiency criterion.

/pdf/resource-allocation-improvement-in-the-tasks-of-airport-1pwc2xwhrd.pdf

Resource allocation improvement in the tasks of airport ground handling operations

This article deals with the review of the main parameters and assessment of a quality system. A quality assurance system and its management are of great importance to an aviation organization whether it is large or small. The final task of the quality system is to ensure the technical aircraft maintenance system at a high level of quality, to ensure airworthiness of the aircraft. In our days Total Quality Management (TQM), as a new philosophy, is gaining power in civil aviation. Seeking quality is vital for maintenance organization for such reasons as the survival of the organization and competitiveness in the market. TQM is directly connected with the ISO 9000:2000 series standard implementation and involves many other parameters such as the qualifications of personnel and training. As an instrument for control, an audit, done by themselves or by an outside company, is indicated.

Aspects of quality evaluation in aviation maintenance

One of the most basic methods of reducing maintenance costs in civil aviation is discussed in this paper. This method, which is used by transport carriers, is a reliability programme. The parameters applied in this programme are described in case as they express the numerical evaluation of failure of aircraft components. Nevertheless, such evaluation permits to assess only the selected components. Other statistical methods must be used to assess the reliability of an entire technical system. For this purpose, a correlation and regression analyses are applied to analyse an entire aircraft system, and some results of this investigation are presented here.

Statistical evaluation and analysis of mutual interaction of components

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Aspects of quality evaluation in aviation maintenance

Statistical evaluation and analysis of mutual interaction of components