Acknowledgments
This study has been realized at Laboratoire des Sciences de l’Information et des Systèmes (UMR CNRS 6168) and Ecole Nationale Supérieure des Arts et Métiers. The subject and industrial context was provided by Eurocopter, with funding through the Marie Curie Host Fellowship.
First and foremost I would like to thank my advisors Daniel BRUN-PICARD, professor at LSIS, ENSAM, Aix en Provence, and Hassan NOURA, professor at LSIS, Université Paul Cézanne, Marseille.
Further, I would like to thank :
Sylviane GENTIL, professor at INPG, ENSIEG, Grenoble, and Domu-nique SAUTER, professor at Université Henri Poincaré, Nancy, for accepting to participate as reporters on the jury, as well as for their remarks and sug-gestions to my manuscript.
Michel VERGé, professor at ENSAM, Paris, for accepting to participate as examinator on the jury, as well as for his remarks and suggestions to my manuscript.
Pierre-Antoine AUBOURG at Eurocopter for accepting to participate on the jury, and for validating the industrial aspects of my work.
Mathieu GLADE at Eurocopter for accepting to participate as examina-tor on the jury, and for supporting me through the .nal year of my study.
Mustapha OULADSINE, professor at LSIS, Université Paul Cézanne, Marseille, for accepting to participate as examinator on the jury.
Luc DAURES, Tran BANG, Philippe JOLY, Cecile ALEXANDRE, Jean-Charles ANIFRANI and Jean-Pierre DERAIN at Eurocopter for their help and support.
Finally, I would like to thank my family and friends, as well as everyone else concerned at LSIS, ENSAM and Eurocopter, for their help and support in the completion of this study.
3

Contents
1
Introduction
11
2
Problem
Statement
13
2.1
Background
............................ 13

2.1.1
History........................... 13

2.1.2
Motivations
........................ 14

2.1.3
RegulatoryDe.nition................... 16

2.2
RotorcraftFailureModes..................... 17

2.2.1
Engines
.......................... 17

2.2.2
TransmissionSystem
................... 18

2.2.3
Rotors
........................... 19

2.3
HealthandUsageMonitoringTasks............... 20

2.3.1
Sensors
and
Acquisition
Procedures
. . . . . . . . . . . 21
2.3.2
UsageMonitoring..................... 25

2.3.3
HealthMonitoring
.................... 26

2.4
ImpactofCurrentTechnology
.................. 27

2.4.1
Reliability
......................... 27

2.4.2
Safety
........................... 28

2.4.3
MaintenanceCredit.................... 29
　
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