posted on 2008-11-11, 08:21authored byDarren R. Prescott, J.D. Andrews
Time-limited dispatch (TLD) allows the dispatch of aircraft with faults present
in their control systems for limited time periods. In order for TLD to be applied to an
aircraft system it is first necessary to demonstrate that the relevant safety and certification
requirements are being met by modelling the system in question. To do this existing
modelling techniques use variations of fault tree analysis and Markov analysis with
various simplifying assumptions, made to assist in the analytical process. Monte Carlo
simulation is presented here as an alternative method of analysis, which can deal well with
the potential difficulties that may present themselves when modelling TLD, such as the
complex architectures of aircraft systems and dependencies that are introduced when
applying TLD. In this paper a simple example system is introduced and the application of
TLD to it is modelled using the existing variation of Markov analysis and a Monte Carlo
simulation technique. The results obtained using the different techniques are seen to differ
and a number of reasons are suggested for this difference.
History
School
Aeronautical, Automotive, Chemical and Materials Engineering
Department
Aeronautical and Automotive Engineering
Citation
Prescott, D.R. and Andrews, J.D., 2008. The safe dispatch of aircraft with known faults. International Journal of Performability Engineering, 4(3), pp. 243-253