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A Methodology for the Quantitative Assessment of the Aircraft Systems Accessibility

Authors: Ortmann, Jenny;

A Methodology for the Quantitative Assessment of the Aircraft Systems Accessibility

Abstract

A reduction of the maintenance effort of commercial aircrafts caused by changes in the sys- tem architecture results in the opportunity to decrease the direct operating costs. At the Institute of Aerospace Systems, the integration of maintenance aspects into the preliminary aircraft design is being researched within the framework of the AGILE 4.0 project. Thereby, the accessibility of on-board systems and their components significantly influences the maintainability of commercial aircrafts. In this thesis, a methodology to quantitatively evaluate the accessibility of aircraft systems is developed. With the self-developed methodology 14 different system properties that influence maintainability are evaluated on a detailed scoring scale, in order to allow gradation between the lowest and highest score. Additionally, there exists the option to use weighting factors to allow different properties or components to have a higher influence on the overall result. To validate the developed methodology, the established maintainability prediction methodology Procedure III, which is published in Handbook 472 of the US military, is also implemented. Both methodologies are applied to a reference system, which corresponds to a part of the hydraulic system of a Boeing 777. The results of this work show that the self-developed methodology provides a more accurate assessment of the maintainability. In addition, it also takes into account the trade-off between opposing system properties. One example is the restricted installation space, which is in con- flict with an increased space between components. Further, the system layout of the reference system is optimized with regard to the maintainability prediction of both methodologies. Here, the advantages of the self-developed methodology also become clear, since a greater improvement in accessibility is achieved, compared to an optimization regarding Procedure III. The weighting factors implemented in the self-developed methodology also allow to target the improvement of certain system properties. Similarly, the component-based weighting can be used to specifically optimize the maintainability of components with higher failure rates.

Keywords

aircraft maintenance, maintainability, preliminary aircraft design

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
Average
Average
Average
Funded by
EC| AGILE 4.0
Project
AGILE 4.0
AGILE 4.0: Towards cyber-physical collaborative aircraft development
  • Funder: European Commission (EC)
  • Project Code: 815122
  • Funding stream: H2020 | RIA
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