A literature review on Fault Diagnosis methods for manned and unmanned helicopters

In the past two decades, the reliability and safety of helicopters have attracted the attention of many researchers. Especially with the development of Unmanned Helicopters, Fault Diagnosis approaches were used for manned or unmanned helicopter platforms. In this paper, a brief state-of-the-art on Fault Diagnosis approaches is presented for helicopters, including analytical model-based, signal processing-based and knowledge-based Fault Diagnosis approaches. A short description of fault types is presented before the main part of the review.