The Application of Advanced Anomaly Detection to Tail Rotor HUMS Data

This paper reports on the application of advanced anomaly detection (AAD) techniques successfully developed and demonstrated on HUMS data for helicopter transmissions, reported in CAA Paper 2011/01, to the analysis of HUMS vibration health monitoring data for helicopter tail rotors currently collected in-service.

The study focuses on three tail rotor failures for which data is available, and also a database of historical Bristow Helicopters Eurocopter AS332L IHUMS data. This work builds on the investigation of the extension of HUMS to helicopter rotors reported in CAA Paper 2008/05